1977L0313 — EN — 22.07.1982 — 001.001 — 1
This document is meant purely as a documentation tool and the institutions do not assume any liability for its contents
►B COUNCILDIRECTIVE
of5April1977
ontheapproximationofthelawsoftheMember Statesrelating tomeasuring systemsfor liquids
otherthanwater
(77/313/EEC)
(OJ L 105, 28.4.1977, p. 18)
Amended by:
Official Journal
No page date
►M1Commission Directive 82/625/EEC of 1 July 1982 L 252 10 27.8.1982
▼B
COUNCILDIRECTIVE
of5April1977
on the approximationof the lawsofthe Member States relating to
measuringsystemsforliquidsotherthanwater
(77/313/EEC)
THE COUNCIL OF THE EUROPEAN COMMUNITIES,
Having regard to the Treaty establishing the European Economic
Community, and in particular Article 100 thereof,
Having regard to the proposal from the Commission,Having regard to the opinion of the European Parliament(
1),
Having regard to the opinion of the Economic and Social
Committee(2),
Whereas in each Member State the construction and methods of control
of measuring systems for liquids are subject to mandatory provisions
which differ from one Member State to another and consequentlyhinder trade in such systems; whereas it is therefore necessary toapproximate these provisions;
Whereas Council Directive 71/316/EEC of 26 July 1971 on the approx-
imation of the laws of the Member States relating to common
provisions for bothmeasuring instruments and meth ods of metrological
control(
3), as last amended by Directive 72/427/EEC(4), has laid down
the EEC pattern approval and EEC initial verification procedure formeasuring instruments; whereas, in accordance with that Directive, thetechnical requirements for the design and functioning of measuringsystems for liquids other than water should be laid down;
Whereas Council Directive 71/319/EEC of 26 July 1971 on the approx-
imation of the laws of the Member States relating to meters for liquids
other than water(
5) and Council Directive 71/348/EEC of 12 October
1971 on the approximation of the laws of the Member States relatingto ancillary equipment for meters for liquids other than water(
6) have
already laid down the technical design and operational requirements
which such meters must satisfy; whereas it is specified in Directive
71/319/EEC that measuring systems including one or more meters forliquids other than water must be the subject of a separate Directive,
HAS ADOPTED THIS DIRECTIVE:
Article 1
This Directive shall apply to measuring systems for liquids other than
water incorporating volumetric meters in which the liquid causes themovement of mobile walls of measuring chambers.
Article 2
Those measuring systems which may bear EEC signs and marks are
described in the Annex hereto. They shall be subject to EEC patternapproval if the provisions of the Annex so require and shall undergoEEC initial verification under the conditions laid down in the Annex
hereto.
Under the conditions laid down in the Annex, EEC pattern approval
may also be granted to measuring system components and sub-assem-blies.1977L0313 — EN — 22.07.1982 — 001.001 — 2
(1) OJ No C 125, 8. 6. 1976, p. 43.
(2) OJ No C 131, 12. 6. 1976, p. 53.
(3) OJ No L 202, 6. 9. 1971, p. 1.
(4) OJ No L 291, 28. 12. 1972, p. 156.
(5) OJ No L 202, 6. 9. 1971, p. 32.
(6) OJ No L 239, 25. 10. 1971, p. 9.
▼B
Article 3
No Member State may, on the grounds of their metrological properties,
refuse, prohibit or restrict the placing on the market or the use of
measuring systems for liquids other than water bearing the signs and
marks provided for in this Directive as specified by Directive 71/316/EEC.
No Member State may, on grounds of their metrological properties,
refuse, prohibit or restrict the placing on the market of measuringsystem components and sub-assemblies bearing the EEC patternapproval sign.
Article 4
1. Member States shall bring into force the laws, regulations and
administrative provisions necessary to comply withth is Directive
within 18 months of its notification and shall forthwith inform the
Commission thereof.
2. Member States shall communicate to the Commission the text of
the provisions of national law which they adopt in the field covered bythis Directive.
Article 5
This Directive is addressed to the Member States.1977L0313 — EN — 22.07.1982 — 001.001 — 3
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ANNEX
1. GENERAL REQUIREMENTS FOR MEASURING SYSTEMS
1.1.Definitions
1.1.1.Measuringsystem
A measuring system for liquids other than water comprises, in addi-
tion to the meter itself conforming to Directive 71/319/EEC and the
ancillary equipment conforming to Directive 71/348/EEC which may
be associated withit, all th e equipment to ensure correct measuring
or intended to facilitate the operation and all other equipment which
can affect measuring in any possible way.
If several meters intended for separate measuring operations operate
in conjunction withcommon components, eachmeter sh all be
considered as comprising, withth e common components, a
measuring system.
If several meters are intended for a single measuring operation, the
meters are considered as forming a single measuring system.
1.1.2.Minimumdelivery
The minimum delivery of a measuring system is determined in
conformity withth e requirements of Directives 71/319/EEC and 71/
348/EEC, having regard to the provisions of this Directive.
In measuring systems intended to measure liquid received into the
system, the smallest volume of liquid for which measurement shall
be authorized is called minimum reception. The preceding require-
ment relating to minimum delivery applies, by analogy, to minimum
reception.
1.1.3.Gasseparator
A gas separator is an apparatus for continuously separating and
removing by an appropriate device any air or gases contained in the
liquid.
The gas evacuation device is, in principle, automatic in operation.
However, this requirement shall be waived if there is a mechanism
which automatically stops the flow of liquid if there is a risk of air
or gas entering the meter. In this case, resumption of measurement
shall be possible only when the air or gas has been removed, either
automatically or manually.
1.1.4.Gasextractor
A gas extractor is an apparatus designed to extract air or gases accu-
mulated in the pipework upstream of the meter in the form of
pockets no more than slightly mixed with the liquid.
The above requirements concerning the gas evacuation device for the
gas separator shall also apply to that of the gas extractor.
1.1.5.Special gasextractor
A special gas extractor is an apparatus which, like the gas separator
but under less stringent operating conditions, continuously separates
any air or gases contained in the liquid, and automatically stops the
flow of liquid if there is a risk of air or gases accumulated in the
form of pockets no more than slightly mixed with the liquid, entering
the meter.
1.1.6.Condensertray
A condenser tray is a closed tank designed to collect, in pressurized
liquefied gas measuring systems, the gases contained in the liquid to
be measured and to condense them before measuring.
1.1.7.Gasindicator
A gas indicator is a device allowing easy detection of any air or gas
bubbles which may be present in the liquid flow.
1.1.8.Sight-glass
A sight-glass is a device for checking that all or part of the
measuring system is completely full of liquid.1977L0313 — EN — 22.07.1982 — 001.001 — 4
▼B
1.2.Scope
The general requirements of section 1 shall apply to all types of
measuring systems unless otherwise specified in section 2.
1.3.Meters, flowratelimits
Meters incorporated in a measuring system, including any ancillary
equipment, shall be of an EEC pattern approved for measuring the
liquid concerned under normal operating conditions.
These meters shall be subject to separate EEC pattern approval or to
approval included in the EEC pattern approval of the measuring
system in which they are incorporated. The flowrate limits
(maximum and minimum flowrates) of a measuring system may
differ from those of the meter fitted to it. In such cases it should be
checked that the maximum and minimum flowrates of the measuring
system are compatible with those of the meter. Even where a meter
has been approved as a component incorporated in a measuring
system, it must in all instances comply withth e requirements of
Directive 71/319/EEC. Where a number of meters are mounted in
parallel on a single measuring system, the sum of the maximum and
minimum flowrates of the various meters shall, with the exception of
the specific instances laid down in this Annex, be taken into account
in determining the flowrate limits of the measuring system. The
maximum flowrate of the measuring system must be at least twice
the total minimum flowrate of its meter or meters.
1.4.Pointoftransfer
1.4.1. Measuring systems shall incorporate a point defining the quantity of
liquid delivered or received and called the point of transfer. This
point of transfer is situated downstream of the meter in delivery
systems, upstream of the meter in receiving systems.
1.4.2. Measuring systems may be of two types: ‘empty-hose’ systems and
‘full-hose’ systems; the term ‘hose’ includes rigid pipework.
1.4.2.1. Empty-hose systems are, in the case of delivery equipment,
measuring systems in which the point of transfer is situated upstream
of a delivery hose. This point of transfer takes the form of either a
weir-type sight-glass or a closing device, combined, in both cases,
with a system which ensures the emptying of the delivery hose after
eachmeasuring operation.
1.4.2.2. Full-hose measuring systems are, in the case of delivery equipment,
measuring systems whose point of transfer consists of a closing
device situated in the delivery pipework. Where the pipework has a
free end, the closing device shall be situated as close as possible to
this end.
1.4.2.3. In the case of receiving equipment, the same requirements apply by
analogy to the reception pipework upstream of the meter.
1.5.Filters
Measuring systems shall incorporate a device upstream of the meters,
intended to collect solid impurities from the liquids (filter). Filters
shall as far as possible be so arranged as to be easily accessible.
1.6.Eliminationofairorgases
1.6.1.Generalrequirement
Measuring systems shall be installed in such a way that they do not
normally produce, upstream of the meter, entry of air or release of
gas into the liquid. If there is a risk that this requirement might not
be met, measuring systems shall incorporate gas-eliminating equip-
ment permitting the proper elimination of any air or undissolved
gases which may be contained in the liquid before it passes through
the meter.
The gas-eliminating equipment shall be suitable for the supply condi-
tions and be arranged in such a way that the additional error due to
the influence of the air and gases on the measuring results shall not
exceed:
— 0·5% of the quantity measured for liquids other than potable
liquids of a viscosity not exceeding 1 mPa·s,1977L0313 — EN — 22.07.1982 — 001.001 — 5
▼B
— 1% of the quantity measured for potable liquids and those whose
viscosity exceeds 1 mPa·s.
However, there shall be no need for the error to be less than 1% of
the minimum delivery.
1.6.2.Pumpedflow
1.6.2.1. Subject to 1.6.6, when the pressure at the pump intake may, even
momentarily, fall below atmospheric pressure or the saturated vapour
pressure of the liquid, a gas separator shall be provided.
1.6.2.1.1. A gas separator intended to operate at a maximum flowrate not
exceeding 100 m3/hmay be subject eith er to separate EEC pattern
approval or to approval included in the EEC pattern approval of the
measuring system of which it forms part, where this Annex provides
for approval of sucha system. However, as regards gas separators
designed to operate at a maximum flowrate exceeding 100 m3/h,
pattern approval may be granted by analogy withan approved pattern
of the same design and smaller dimensions. Gas separators which
have received separate EEC pattern approval may be used in
measuring systems without gas indicators.
1.6.2.1.2. The gas separator shall in principle be installed downstream of the
pump. It may, however, be combined with the pump.
It shall always be positioned as close as possible to the meter so that
the pressure drop due to the flow of liquid between the two compo-
nents is negligible.
1.6.2.1.3. The operational limits of a gas separator shall be as follows:
(a) the maximum flowrate or flowrates for one or more specified
liquids;
(b) the maximum and minimum pressure limits compatible with
proper functioning of the gas eliminating device.
1.6.2.1.4. Where a gas separator intended to operate at a maximum flowrate not
exceeding 100 m3/his covered by a separate EEC pattern approval,
it shall, within the error limits laid down in 1.6.1, ensure the elimina-
tion of air or gases mixed with the liquid to be measured, under the
following test conditions:
(a) the measuring system shall operate at its maximum flowrate and
the minimum pressure laid down for the gas separator;
(b) any proportion by volume of air or gases relative to the liquid is
permissible if the gas separator is designed for a maximum flow-
rate lower than or equal to 20 m3/h; it shall be limited to 30% if
the gas separator is designed for a maximum flowrate higher
than20 m3/h.(Air or gases shall be measured at atmospheric pres-
sure to determine their percentage.)
In addition, the automatic gas removal device shall continue to
operate properly at the maximum pressure laid down for gas separa-
tors.
1.6.2.1.5. Where a gas separator is approved as a component incorporated in an
approved measuring system, the requirements of 1.6.2.1.4 may be
applied to it. In this case, a gas indicator is not necessary.
Where the measuring system incorporates a gas indicator conforming
to the definition in 1.1.7, the gas separator shall, within the error
limits laid down in 1.6.1, ensure the elimination of air or gases mixed
with the liquid to be measured, under the following conditions:
(a) the measuring system shall operate at its maximum flowrate and
minimum pressure;
(b) the proportion by volume of air or gases relative to the liquid
shall not exceed:
— 20% for liquids other than potable liquids of a viscosity not
exceeding 1 mPa·s,
— 10% for potable liquids and for other liquids of a viscosity
which is in excess of 1 mPa·s(1).1977L0313 — EN — 22.07.1982 — 001.001 — 6
(1) Experience shows that the requirement referred to in subparagraphs (a) and (b) is
generally met by a properly built separator if its effective volume is at least equal to8% of the volume delivered in one minute at the maximum flowrate indicated on the
plate of the measuring system.
▼B
Where the proportion by volume of air or gases relative to the liquid
exceeds the above percentages and the gas separator fails to meet the
requirements in respect of maximum permissible errors, gas or air
bubbles must be clearly visible in the gas indicator.
1.6.2.2. When the pressure at the pump inlet is constantly greater than the
atmospheric pressure and the saturated vapour pressure of the liquid,
and there is no gas separator, a gas extractor or special gas extractor
shall be necessary if gaseous formations are liable to occur between
the pump and the meter during non-flow periods or if air pockets can
be introduced into the pipework (e.g. when the supply tank is
completely empty) in sucha manner as to produce a specific error
in excess of 1 % of the minimum delivery.
1.6.2.2.1. The gas extractor or special gas extractor intended to operate at a
maximum flowrate not exceeding 100 m3/hmay be subject eith er
to separate EEC pattern approval or approval included in the EEC
pattern approval of the measuring system of which it forms part, if
the present Annex makes provision for approval of the system.
However, as regards gas extractors intended to operate at a maximum
flowrate in excess of 100 m3/h, pattern approval may be granted by
analogy withan approved pattern of th e same design and with
smaller dimensions.
Gas extractors and special gas extractors which have been granted
separate EEC pattern approval may be used in measuring systems
without gas indicators.
1.6.2.2.2. The gas extractor or special gas extractor shall in principle be
installed downstream of the pump. However, it may also be
combined withth e pump.
In both cases, it shall normally be installed at the highest point in the
pipework, as close as possible to the meter and upstream of it. If it is
installed below the level of the meter, a non-return device, fitted if
necessary witha pressure limiting valve, sh all be incorporated to
prevent the pipes between the valve and the meter from emptying.
If the pipework upstream of the meter incorporates several high
points, several gas extractors may be required.
1.6.2.2.3. The limits of operation of a gas extractor or special gas extractor are
as defined for gas separators in 1.6.2.1.3 including the minimum
delivery for which such devices are provided.
1.6.2.2.4. A gas extractor or special gas extractor shall, at the maximum flow-
rate of the measuring system, ensure the elimination of a gas or airpocket, measured under atmospheric pressure, of a volume at least
equal to the minimum delivery without an additional error greater
than 1% of the minimum delivery. Moreover, a special gas extractor
shall also be capable of separating continuously a volume of gas or
air equal to 5% of the volume of the liquid delivered at the maximum
flowrate without the resulting additional error exceeding the limits
fixed in 1.6.1.
1.6.2.3. The requirements of 1.6.2.1 and 1.6.2.2 shall not prohibit the exis-
tence of manual or automatic extraction devices in fixed
installations of large dimensions.
1.6.2.4. If the supply of the liquid is so arranged that, whatever the conditions
of use, no gas or air can form in or penetrate into the reception pipe-
work upstream of the meter during measurement, no gas elimination
device is required, provided that any gaseous formation liable to
occur during non-flow periods does not cause a specific error in
excess of 1% of the minimum delivery.
1.6.3.Non-pumpedflow
1.6.3.1. In cases where the meter is supplied by gravity, without use of a
pump, if the pressure of the liquid in all parts of the pipework
upstream of the meter and in the meter itself is greater than the satu-
rated vapour pressure and atmospheric pressure, a gas eliminator
shall not be necessary. However, after the measuring system has
been put into service, an arrangement is required to ensure that it
remains correctly filled.
1.6.3.2. If the pressure of the liquid is likely to be less than atmospheric pres-
sure while remaining greater than the saturated vapour pressure, the
introduction of air into the meter shall be prevented by means of an
appropriate device.1977L0313 — EN — 22.07.1982 — 001.001 — 7
▼B
1.6.3.3. Where the meter is supplied under gas pressure, the entry of gas into
the meter shall be prevented by means of an appropriate device.
1.6.3.4. In all circumstances the pressure of the liquid between the meter and
the point of transfer shall be higher than the saturated vapour pres-
sure of the liquid.
1.6.4.Gasremoval
The gas removal pipe of a gas eliminator shall not include a manu-
ally controlled valve if closure of this valve prevents the operation of
the gas eliminator. If, however, a closing device of this kind is
required for safety reasons, it must be possible to ensure its mainte-
nance in the open position by means of a sealing device.
1.6.5.Anti-swirldevice
If it is intended as a general rule that the supply tank of a measuring
system be completely emptied, the outlet orifice of the tank shall be
provided with an anti-swirl device, except where the system incorpo-
rates a gas separator.
1.6.6.Viscousliquid
As the effectiveness of gas separators and gas extractors decreases
with an increase in the viscosity of the liquid, these devices need
not be fitted in the case of liquids with a dynamic viscosity of more
than 20 mPa·s at 20 ºC. The pump shall be so arranged that the inlet
pressure is always greater than the atmospheric pressure. If this
condition is unlikely to be fulfilled on ali occasions, a device shall
be fitted to stop the flow of the liquid automatically as soon as the
inlet pressure falls below the atmospheric pressure. A manometer
shall be used to monitor this pressure. These conditions are not
necessary if the measuring system incorporates devices ensuring that
no air can be introduced through the joints in the sections of pipe-
work subjected to reduced pressure.
When the measuring system is not in use, the pipework shall be kept
full of liquid up to the point of transfer.
1.7.Gasindicator
1.7.1. Measuring systems may be fitted witha gas indicator. Suchdevices
may be made mandatory in the cases specified in section 2.
1.7.2. The gas indicator shall be so designed as to provide a satisfactory
indication of the presence of gas or air in the liquid.
1.7.3. The gas indicator shall be installed downstream of the meter.1.7.4. In empty-hose measuring systems the gas indicator may take the
form of a weir-type sight-glass and may also be used as a point of
transfer.
1.7.5. The gas indicator may be provided with a bleed screw or some other
blow-off device when it forms a high point in the pipework. No pipe
shall be connected to the blow-off device. Flow indicators (e.g. spin-ners) may be incorporated in the gas indicator, provided that such
devices do not prevent any gaseous formations which may be present
in the liquid from being visible.
1.8.Completefillingofthemeasuringsystem
1.8.1. The meter and the pipework from the meter to the point of transfer
shall automatically be kept full of liquid during the measuring opera-
tion and when the system is not in use.
If this condition is not fulfilled, particularly in cases where the instal-
lation is fixed, it must be possible for the complete filling of the
measuring system up to the point of transfer to be effected manually
and monitored during measurement, and when the system is not
being used. To ensure the complete elimination of air and gas from
the measuring system, blow-off devices, if possible with small
windows, shall be placed at appropriate positions.
1.8.2. The pipework between the meter and the point of transfer shall not,
in general, by variations in temperature, induce additional errors of
more than 1% of the minimum delivery.
Section 2 shall specify the technical conditions to be fulfilled in
certain special cases in order that this requirement may be met.1977L0313 — EN — 22.07.1982 — 001.001 — 8
▼B
1.8.3. If necessary, a pressure maintaining device shall be installed down-
stream of the meter to ensure that the pressure in the gas
eliminators and in the meter is always greater than the atmospheric
pressure and the saturated vapour pressure of the liquid.
1.8.4. Measuring systems in which there is a possibility of the liquid
flowing in the direction opposite to that of normal flow when the
pump has stopped, shall be provided with a non-return valve, fitted
witha pressure-limiting device if necessary.
1.8.5. In empty-hose measuring systems the pipework downstream from the
meter and, if necessary, the pipework upstream of the meter shall
have a high point so that all parts of the measuring systems remain
constantly filled. Draining of the delivery hose referred to in 1.4.2.1
shall be assured by an air vent. In certain cases this air vent may be
replaced by special devices suchas an auxiliary pump or a
compressed-gas injector. In measuring systems designed for
minimum deliveries of less than 10 m3, suchdevices sh all operate
automatically.
1.8.6. In full-hose measuring systems the free end of the hose shall incorpo-
rate a device to ensure that the hose cannot be emptied during
periods when the system is not used. This requirement need not apply
to liquefied gas.
When a closing device is placed downstream of this device, the
volume of the space between them shall be as small as possible and
in any case less than the maximum permissible error for the
minimum delivery of the measuring system.
In the case of systems intended for measuring viscous liquids, the
end of the nozzle shall be so designed that it cannot retain a quantity
of liquid exceeding 0·4 times the maximum permissible error for the
minimum delivery of the measuring system.
1.8.7. If the hose comprises several components, these shall be assembled
either by means of a special connector to keep the hose full or by a
connection system which is either sealed or ensures that the compo-
nents are virtually impossible to separate without a special tool.
1.9.Variationofinternalvolumeoffullhoses
In the case of full hoses in a measuring system provided with a hose
reel, the increase in internal volume due to the change from the
coiled position, when not subjected to pressure, to the uncoiled posi-
tion, when subjected to pressure without any flow of liquid, shall not
be more than twice the maximum permissible error for the minimum
delivery.
If the measuring system is not provided with a hose reel, the internal
volume increase shall not exceed the maximum permissible error for
the minimum delivery.
1.10.Branches
1.10.1. In measuring systems which are intended to deliver liquids, branches
downstream of the meter shall only be permitted if they are so
arranged as to ensure that the liquid is discharged from a single
outlet at a time. In measuring systems intended to receive liquids,
branches upstream of the meter are permitted only if they are so
arranged that the intake of liquid is effected through a single pipe at
a time.
Departures from these requirements may only be approved in the
case of delivery systems which are specifically installed to supply
only one user at a time, and receiving systems which cannot operate
for more than one supplier at a time.
1.10.2. In measuring systems operating either with an empty hose or a full
hose and having flexible pipes, a non-return valve shall if necessary
be incorporated in the rigid pipework leading to the full hose imme-
diately downstream from the selector valve. In addition the selector
valve shall not in any position permit connection of the discharge
hose, operating as an empty hose, to the pipework leading to the
full hose.
1.11.By-passes
Any connections intended for by-passing the meter shall be closed by
means of blanking flanges. However, if the operating requirements1977L0313 — EN — 22.07.1982 — 001.001 — 9
▼B
make such a by-pass necessary, it shall be closed either by means of
a closing disc or by means of a double closing device witha moni-
toring valve in-between. It must be possible to ensure closure by
means of seals.
1.12.Valvesandcontrolmechanisms
1.12.1. If there is a risk that the supply conditions might lead to the meter
becoming overloaded, a flow-limiting device shall be provided. This
device shall be placed downstream of the meter if it causes a pres-
sure loss. It must be possible to seal it.
1.12.2. The various positions for the operating components of multi-way
valves shall be easily visible and located by notches, stops or other
fixing devices. Departures from this requirement are permissible
whenever the adjacent positions of the operating handle form an
angle of 90º or over.
1.12.3. Retaining valves and closure mechanisms not used to define the
quantity measured must, if necessary, have relief valves in order to
dissipate any abnormally high pressures which may arise in the
measuring system.
1.13.Layoutofmeasuringsystems
Measuring systems shall be installed in such a manner that the indi-
cating device is clearly visible under normal conditions of use. The
indicating device and, if present, the gas indicator of the gas
separator shall as far as possible be observable from one position.
Sealing devices shall be easily accessible, plates shall be fixed irre-
movably and the statutory markings shall be clearly legible and
indelible.
1.14.On-siteverification devices
Verification of the installation, as provided for in 3.2 shall be
possible. If necessary, pipework shall be provided to return the
measured liquid to a storage tank. The installation shall, as necessary,
be equipped withtemperature and pressure tappings, especially wh en
the operation or testing of the measuring systems requires a knowl-
edge of these factors.
1.15.Characteristics ofameasuringsystem
The characteristics of a measuring system are as follows:
— maximum and minimum flowrates,
— maximum operating pressure,
— if necessary, minimum operating pressure,— the liquid or liquids to be measured and the limits of viscosity,
kinematic or dynamic, where an indication of the nature of the
liquids alone is not sufficient to determine their viscosity,
— minimum delivery,
— the temperature range in the case where the liquid can be
measured at a temperature below −10 ºC or above + 50 ºC.
1.16.Markings
A measuring system, component or sub-assembly which has been
granted pattern approval must carry, in a legible and indelible
manner, either on the dial of the indicating mechanism or on a
special descriptive plate, the following information:
(a) the EEC pattern approval sign;
(b) the identification mark or name of the manufacturer;
(c) the manufacturer's designation, if any;
(d) the serial number and year of manufacture;
(e) the characteristics of the measuring system as defined in 1.15;
(f) any supplementary information specified in the pattern approval
certificate.
If several meters operate in a single system withth e use of common
components, the markings required for each part of the system may
be combined on a single plate.1977L0313 — EN — 22.07.1982 — 001.001 — 10
▼B
The markings on the dial of the indicating mechanism of the meter
forming part of the measuring system must not contradict those on
the descriptive plate of the measuring system.
If the measuring system can be transported without being dismantled
the markings for each part may also be combined on a single plate.
1.17.Seals
Sealing shall preferably be carried out by lead stamping. However,
certain seals applied withpincers sh all be permitted on fragile instru-
ments or where such seals are sufficiently protected against any
danger of accidental breakage.
Seals must in all cases be easily accessible.
Sealing devices shall be provided on all parts of measuring systems
which cannot be protected in any other way against operations which
might affect accuracy of measurement. However, sealing devices
need not be provided on connections which can only be dismantled
by means of a tool.
The sealing devices shall be so designed as to enable the EEC partial
initial verification mark to be affixed.
It shall be possible to seal the stamping-plate referred to in 3.3.2.1 of
Annex II to Directive 71/316/EEC to a support of the measuring
system. It may be combined with the descriptive plate on the
measuring system referred to in 1.16.
In the case of a measuring system used for potable liquids, the seals
shall not be affixed, so that the system can be dismantled for the
purposes of cleaning.
2. SPECIAL REQUIREMENTS FOR DIFFERENT TYPES OF
MEASURING SYSTEMS
2.1.Liquid-fuelmeasuringsystems (1)
2.1.1. Liquid-fuel measuring systems are measuring systems intended for
the delivery of liquid fuel into the fuel tanks of road vehicles.
Measuring systems used for refuelling pleasure boats and small
aircraft withliquid fuel sh all be treated as liquid-fuel measuring
systems.
They may include their own supply arrangement or be designed for
installation in a central supply system.
The ratio between the maximum and minimum flowrates of these
systems shall be at least 10: 1.
2.1.2. Where the measuring system has its own supply arrangement, a gas
separator shall, if possible, be installed immediately upstream of the
meter inlet.
This gas separator shall meet the requirements of 1.6.2.1.4 or
1.6.2.1.5(2).
In this latter case, no blow-off device as referred to in 1.7.5 shall be
permitted.
2.1.3. Where the measuring system is designed for installation in a central
supply system or for refuelling at a distance, the general rules of 1.6
shall be applied.
2.1.4. Liquid-fuel measuring systems shall be fitted with a device for reset-
ting the volume indicator to zero in accordance with 1.1, 1.2, 1.3 and1977L0313 — EN — 22.07.1982 — 001.001 — 11
(1) Additional provisions will be added later concerning liquid-fuel measuring systems
incorporating:— motor-fuel blending meters,— motor-fuel and lubricant blending meters,— electric or electronic indicators and ancillary devices,
— self-service devices, and
— measuring systems intended for the supply of liquefied gas.
(
2) In the case of separators which comply with 1.6.2.1.5. experience shows that the
requirement is generally met if the effective volume of the separator is at least 5% ofthe volume supplied in one minute at the maximum flowrate indicated on the meter
plate.
▼B
1.5 of the Annex to Directive 71/348/EEC, as well as a volume tota-
lizer.
Where these systems also incorporate a price indicator, the indicator
shall be fitted with a device for resetting it to zero.
Devices for resetting the price indicator and volume indicator to zero
shall be incorporated in such a way that the resetting of either of
these indicators to zero automatically resets the other to zero.
2.1.5. Where the liquid-fuel measuring system has its own supply arrange-
ment operated by an electric motor, a device shall be fitted which,
after the motor has stopped, prevents any further delivery of the
liquid until the indicator has been reset to zero.
Under no circumstances shall resetting to zero be possible during
delivery.
2.1.6. The non-return device referred to in 1.8.4 shall be mandatory. It shall
be installed between the gas eliminator and the meter. However it
may be placed immediately downstream of the meter if the gas elim-
inator is installed above the level of the meter. In this case, it may be
combined with the device provided for in 1.8.3. Where the non-return
device is installed between the gas eliminator and the meter, the
resulting pressure loss must be low enoughto be considered negli-
gible.
2.1.7. The hoses on full-hose measuring systems shall incorporate a manual
closure mechanism which meets the requirements of 1.8.6. An auto-
matic closure mechanism may also be incorporated.
Full-hose measuring systems supplied solely by means of a hand-
operated pump, need only incorporate the closure mechanism
referred to in 1.8.6.
2.1.8. Measuring systems witha maximum flowrate of 60 litres/minute or
less must have a minimum delivery not exceeding five litres.
2.1.9. Where the meter is fitted with a ticket-printer, the ticket-printing
device must be connected to the device which resets the volume indi-
cator to zero. This arrangement must enable the ticket to be checked
after printing by comparison with the indication shown.
2.1.10. In accordance with3.2, initial verification of liquid-fuel measuring
systems shall be carried out in one or two stages depending on
whether or not they have their own supply system.
2.2.Measuring systems fitted to road tankers for the transport and
delivery of liquids with low viscosity (viscosity ≤20 mPa·s)
storedatatmosphericpressure,exceptforpotableliquids
2.2.1. The requirements of 2.2 shall apply to measuring systems fitted to
road tankers or transportable tanks.
Measuring systems may be installed on road tankers containing one
or more compartments, in which case each compartment shall be
fitted withits own closure valve (manual or automatic).
2.2.2. In accordance withnational rules on use, if any, eachmeasuring
system shall be used for a specified product or for a category of
products for which the meter has been granted EEC pattern approval.
The pipework shall be so designed that the mixing of products in the
measuring system is easily prevented.
2.2.3. Where tanks are fitted to trailers or semi-trailers, the measuring
systems may be affixed either to the tractor or to the trailer or semi-
trailer.
2.2.4. A measuring system fitted to a road tanker may be of the empty-hose
or full-hose type. It may also have either one empty hose and one full
hose or two full hoses of different dimensions arranged so as to
operate alternately.
Change-over shall not be possible during a measuring operation.
2.2.5. Where the meter is fitted with a ticket-printer, the printing of the
ticket shall be coupled with the resetting to zero of the volume indi-
cator.
2.2.6. A measuring system fitted to a road tanker may be designed to
operate solely by pump, solely by gravity, either by pump or by
gravity, or by gas pressure.1977L0313 — EN — 22.07.1982 — 001.001 — 12
▼B
2.2.6.1. Measuring systems supplied solely by pump may operate as full-hose
or as empty-hose systems.
2.2.6.1.1. If there is a risk that the condition in 1.6.2.4 may not be met, the
meter shall be preceded by a gas eliminator such as:
(a) a suitable gas separator, which shall meet the requirements of
1.6.2.1.4 or 1.6.2.1.5(1);
(b) a gas extractor;
(c) a special gas extractor.
Where the meter outlet pressure in the measuring system may fall
below the atmospheric pressure but remain higher than the saturated
vapour pressure of the liquid measured, these devices shall be
combined with an automatic mechanism to slow down and stop the
flow, in order to prevent any air passing into the meter.
If there is no risk of the meter outlet-pressure falling below the atmo-
spheric pressure (which is the case, in particular, with systems
operating only on full-hose) automatic mechanisms to slow down
and stop the flow shall not be required.
2.2.6.1.2. The special gas extractor with an automatic stop device shall be
fitted witha sigh t-glass in accordance with1.1.8.
2.2.6.1.3. The compartments in road tankers shall be fitted with an anti-swirl
device, except where the measuring system has a gas separator
conforming to the requirements of 1.6.2.1.4.
2.2.6.2. Measuring systems operating solely by gravity shall meet the
following requirements:
2.2.6.2.1. The equipment shall be so designed that the total content of the
compartment or compartments can be measured at a flowrate greater
than or equal to the minimum flowrate through the measuring
system.
2.2.6.2.2. If there are links with the gas phase in the tank, appropriate devices
shall prevent any gas from entering the meter.
2.2.6.2.3. The compartments of the tank shall be fitted with an anti-swirl
device, except where the measuring system has a gas separator in
conformity withitem 1.6.2.1.4.
2.2.6.2.4. The requirements of 1.6.3.1, 1.6.3.2 and 1.6.3.4 shall apply. An
accelerating pump may be used downstream of the point of transfer
if the foregoing conditions are satisfied. Such a pump shall not allow
any drop in pressure in the meter.
2.2.6.2.5. In some measuring systems, particularly those having a special gas
extractor with an automatic stop device and those having a perma-
nent venting communication with the atmosphere immediately
downstream of the point of transfer, a gas indicator shall not be
required.
However, in measuring systems witha manual air-vent immediately
downstream of the point of transfer, a gas indicator shall be manda-
tory except in systems where the pressure may not fall below
atmospheric pressure.
2.2.6.3. Measuring systems which can operate either by pump or by gravity
shall satisfy the requirements of 2.2.6.1 and 2.2.6.2.
2.2.6.4. Measuring systems fed by means of gas pressure may operate as
empty-hose or as full-hose systems. The pipework linking the device
to prevent gas entering the meter, as specified in 1.6.3.3, and the
meter itself, shall not incorporate any constriction or component
likely to cause a pressure loss which generates gaseous formation by
releasing the gas dissolved in the liquid.
Such systems shall incorporate a manometer which indicates the
pressure inside the tank. The zone of permissible pressures shall be
shown on the dial of the manometer.1977L0313 — EN — 22.07.1982 — 001.001 — 13
(1) In the case of separators which comply with 1.6.2.1.5, experience shows that the
requirement is generally met if the effective volume of the separator is at least 5% of
the volume supplied, in one minute at the maximum flowrate of the measuring system.▼M1
▼B
▼B
2.3.Reception measuring systems for the unloading of marine, rail
androadtankers
2.3.1. Measuring systems designed to measure the volume of liquids
unloaded from marine, rail and road tankers shall incorporate an
intermediate tank in which the level of the liquid determines the
point of transfer.
This intermediate tank may be designed to deal with gas elimination.
2.3.1.1. In the case of road and rail tankers, the intermediate tank shall auto-
matically maintain a constant level which is visible or otherwise
detectable at the start and on completion of the measuring operation.
The permissible variations in the constant level shall correspond to a
volume of no more than the maximum permissible error for the
minimum reception.
2.3.1.2. In the case of marine tankers, provision for automatic maintenance of
a constant level shall not be necessary; if no such provision is made,
the variations in the content shall be measurable.
If the marine tanker is emptied by pumps located in the bottom of the
tanker, the intermediate tank need only be used at the beginning and
end of reception.
2.3.1.3. In the two cases referred to in 2.3.1.1 and 2.3.1.2, the cross-section of
the intermediate tank shall be such that a quantity equal to the
maximum permissible error for the minimum reception corresponds
to a difference in level of at least 2 mm.
2.4.Measuring systems, whether stationary or fitted to road tankers,
for the measuring of pressurized liquefied gas (excluding cryo-
genic liquids)
2.4.1. There shall be a permanent link along rigid pipework between these
measuring systems and their feed tanks. A non-return valve shall be
fitted between the feed tanks and the meter.
2.4.2. A pressure maintenance device located downstream of the meter shall
ensure that the product is in a liquid state inside the meter during the
measuring process. The required pressure may be maintained either
at a fixed value or at a value adjusted to suit measurement condi-
tions.
2.4.2.1. If the pressure is maintained at a fixed value, that value shall be at
least equal to the vapour pressure of the product at a temperature
15 ºC higher than the highest possible in-service temperature. It shall
be possible to seal the setting of the pressure maintenance device.
2.4.2.2. Where the pressure is adjusted to suit measurement conditions, it
shall exceed the vapour pressure of the liquid by at least 100 kPa (1
bar) during measurement. This function shall be automatic.
2.4.2.3. In the case of stationary measuring systems for industrial use, the
competent metrology service may authorize the use of manually
adjustable pressure maintenance devices, in which case the pressure
at the meter outlet shall not be less than the vapour pressure of the
product at a temperature 15 ºC above the temperature of the liquid
during measurement. A diagram shall be affixed to the measuring
system to show the vapour pressure of the product measured as a
function of its temperature. If it is anticipated that these measuring
systems may have to operate unsupervised for long periods, the
temperature and pressure shall be registered continuously by
recording equipment.
2.4.3. A gas-elimination device shall be provided upstream of the meter
consisting of either a gas separator or a condenser tray.
2.4.3.1. The gas separator shall satisfy the general requirements laid down in
section 1 for either the liquefied gas itself or for a liquid of greater
viscosity.
However, because of the difficulty of verification, it is permissible
for a gas separator to be approved if its effective volume is not less
than 1·5% of the volume delivered in one minute at maximum flow-
rate in cases where the pipe connecting the meter to the storage tank
is not more than 25 m long. If it exceeds 25 m in length, the effec-
tive volume of the gas separator shall be not less than 3% of the
volume delivered in one minute at maximum flowrate.
It shall not be necessary to fit either a gas indicator or a sight-glass to
liquefied gas measuring systems.1977L0313 — EN — 22.07.1982 — 001.001 — 14
▼B
The gas-evacuation pipe may be connected to the space containing
the gas phase in the feed tank or to a self-contained pressure mainte-
nance device set at a pressure 50 to 100 kPa (0·5 to 1 bar) below the
pressure at the meter outlet. This pipe may incorporate a shut-off
valve, but it must not be possible to close this valve during the
measuring process.
2.4.3.2. The volume of the condenser tray shall depend on the volume of the
pipework between the supply tank valve and the pressure mainte-
nance value downstream of the meter. It shall not be less than twice
the decrease in volume of the liquid liable to occur if the temperature
drops by a value conventionally fixed at 10 ºC for pipework exposed
to the atmosphere and 2 ºC for buried or thermally insulated pipe-
work. For the evaluation of the volume, coefficients of thermal
expansion of 3 · 10−3per degree Celsius for propane and propylene
and 2 · 10−3per degree Celsius for butane and butadiene shall be
used instead of the exact values. For other products with a high
vapour pressure, the values of the coefficient to be adopted shall be
fixed by the competent metrology service.
The condenser tray shall be fitted with a manually operated blow-off
device.
In a measuring system, the condenser tray shall be located at the
highest point in the pipework.
The volume calculated by the foregoing method may be spread over
several condenser trays located at the highest points in the pipework.
2.4.4. A thermowell shall be provided in the immediate vicinity of the
meter. The thermometer used shall have a scale interval not
exceeding 0·5 ºC and shall be verified.
A manometer shall be fitted between the meter and the pressure
maintenance valve.
For measuring systems incorporated in road tankers, a manometer
socket shall be adequate.
2.4.5. Where the measuring process is carried out on a system fitted to a
road tanker, there shall be no connection between the gas phases in
the supply tank and the reception tank.
2.4.6. Safety valves may be incorporated into measuring systems for the
purpose of preventing abnormally high pressure. If these valves are
located downstream of the meter, they shall open into the atmosphere
or be connected to the reception tank.
Under no circumstances shall the safety valves located upstream of
the meter be connected by piping which by-passes the meter to the
valves located downstream.
2.4.7. If operating conditions necessitate the use of detachable hoses, the
hoses shall remain full if their volume is greater than the maximum
permissible error for the minimum delivery.
Detachable full hoses shall be equipped with special ‘coupler’
connections for full hoses. Manual blow-off devices shall be
provided, if necessary, at the ends of these hoses.
2.4.8. The monitoring valve of the double closing device specified in 1.11
for any pipework by-passing the meter must be capable of being shut
off for safety reasons. In suchcases, a manometer fitted between th e
two shut-off valves or any other equivalent system shall monitor any
leakages.
2.5.Measuringsystemsformilk
2.5.1. The requirements of 2.5 shall apply to portable measuring systems
used to monitor the reception of milk by collecting tankers, to fixed
measuring systems used for reception and to portable or fixed
measuring systems used for the delivery of milk.
2.5.2. In reception equipment, the point of transfer shall consist of a
constant level in a tank located upstream from the meter. This
constant level shall be visible before and after each measuring opera-
tion, and shall be automatically re-established.
2.5.2.1. Where the meter is supplied by a pump, the constant-level tank may
be installed before the pump or between the pump and the meter.1977L0313 — EN — 22.07.1982 — 001.001 — 15
▼B
2.5.2.1.1. In the first case the tank may itself be supplied by gravity, by the
emptying of churns, or with the aid of an auxiliary pump or vacuum
system.
If the milk is delivered into the tank with the aid of a pump or a
vacuum system, a gas eliminator shall be necessary; this eliminator
may be combined withth e constant-level tank.
2.5.2.1.2. In the second case, the constant-level tank shall act as a gas elimi-
nator.
2.5.2.2. Notwithstanding the requirements of 1.8.3, the meter may function
with the aid of a vacuum system. In this case, since the pressure
inside the pipework between the constant-level tank and the meter is
lower than atmospheric pressure, the pipework connections must be
perfectly leak-tight. It must be possible to check this tightness.
2.5.2.3. In all cases of reception, the pipework upstream of the constant level
must be completely emptied by an automatic mechanism under usual
operating conditions.
2.5.2.4. The constant level shall be monitored by means of a sight-glass or
level indicator. The level will be regarded as constant when it settles
within a zone lying between two lines corresponding to a difference
in volume of not more than twice the maximum permissible error on
minimum delivery. The distance between the two lines must be at
least 15 mm.
2.5.2.5. .If, to meet the requirement of 2.5.2.4, decelerating mechanisms are
incorporated in the measuring system, the flowrate during the decel-
erating period must not descend below the minimum flowrate of the
meter.
2.5.2.6. If, in reception equipment, the liquid measured is conveyed at a level
lower than that of the meter, an automatic mechanism shall ensure a
pressure higher than atmospheric pressure at the meter outlet.
2.5.3. Measuring systems used for the delivery of milk shall meet the
requirements of section 1.
2.5.4. Notwithstanding the general requirements of section 1 regarding the
elimination of air or gas, gas elimination equipment shall meet the
requirements of 1.6.1 under operating conditions only, i.e. when air
enters at the beginning and end of each measuring operation.
For reception equipment, the user shall be able to ascertain the leak-
tightness of the connections so that no air may enter upstream of the
meter during measuring. For delivery equipment, the system shall be
assembled so that the liquid pressure in the connecting pipes running
from the supply tank is always positive.
3. EEC PATTERN APPROVAL AND EEC INITIAL VERIFICATION
3.1.EECpatternapproval
3.1.1.Thefollowing systemsshallbesubjecttoEECpatternapproval:
— liquid-fuel measuring systems, referred to in 2.1. When such
systems are designed for installation in a central supply system,
the pattern approval certificate shall be accompanied by one or
more specimen drawings showing the conditions for assembly at
the place of use,
— measuring systems fitted to road tankers for the transport and
delivery of liquids of low viscosity (viscosity ≤20 mPa·s) stored
at atmospheric pressure (except potable liquids), referred to in
2.2,
— pressurized liquefied-gas measuring systems fitted to road
tankers, referred to in 2.4,
— measuring systems for the reception of milk, referred to in 2.5.
3.1.2.Tests
3.1.2.1. In the execution of the tests, working standards and their use shall be
determined in such a way that the measuring inaccuracy of the cali-
bration method does not exceed one-fifth of the maximum
permissible error for the measuring system under examination.
3.1.2.2. Meter test
It is first necessary to determine the curve of errors as a function of
flowrate, using a sufficiently large number of measuring points
between the minimum and maximum flowrates. It is necessary to1977L0313 — EN — 22.07.1982 — 001.001 — 16
▼B
verify in particular the width of the range of errors of the meter in
the zone; the position of the error curve in relation to the zero line
is of lesser importance.
It may also be necessary to carry out tests beyond the permitted flow-
rate limits.
Tests must also be carried out as far as possible at the operational
limits, i.e. for the maximum and minimum temperatures and viscos-
ities specified and for minimum delivery.
Except in the case of tests for minimum delivery, the test volume
shall be selected so as to be large enough to ensure that the value
of the scale of the indicator is never greater than one-third of the
maximum permissible error.
Where EEC pattern approval has already been granted in respect of
the meter and its ancillary equipment, it is necessary to verify
whether the characteristics of the meter and of the measuring system
are sufficiently compatible. If so, the meter need not be submitted to
further tests, but the minimum delivery of the measuring system must
be determined in accordance with 4.2 of Chapter I of the Annex to
Directive 71/319/EEC.
Should the characteristics of the meter not be compatible with those
of the measuring system, or should no EEC pattern approval have
been granted in respect of the meter (and its ancillary equipment),
the entire measuring system must be tested in accordance with this
Directive and withDirectives 71/319/EEC and 71/348/EEC.
3.1.2.3. Tests for air or gas elimination
The tests must show that the air or gas elimination equipment meets
the requirements of 1.6.2.1.4, 1.6.2.1.5 and 1.6.2.2.4.
Where gas separators and special gas extractors are fitted, continuous
elimination shall be checked by comparison of the measurement
results of a suitable volumetric meter inserted downstream of the
separator (special extractor) with and without the addition of air or
gas.
Where special extractors are fitted, it is also necessary to test for the
complete emptying of the tank. If possible, the tests should be carried
out withth e least favourable liquid. In tests on mock-ups or models
on a different scale from the actual equipment, account shall be taken
of the laws of similarity concerning viscosity (Reynolds), gravity
(Froude) and surface tension (Weber). As a general rule tests on
models shall only be carried out where justified.
3.1.2.4. Tests on special measuring systems.
3.1.2.4.1. Liquid-fuel measuring systems.
The tests shall comprise:
(a) checking of the meter, checking of ancillary equipment and
determination of the influence of such equipment (price indi-
cator, printer, presetting device, etc.);
(b) checking of the gas eliminator;
(c) checking of the constancy of the volume of the hose;
(d) a special check to verify regular advance of the price indicator
(irregular advance may be induced in the first component of the
price indicator by sudden closing of the delivery valve).
3.1.2.4.2. Liquefied gas measuring systems.
The examination shall comprise:
(a) verification from drawings of the efficiency range and the design
of gas separators;
(b) an operating test on the gas eliminator (level regulator), which
may be incorporated in the gas separator.
The pressure maintenance device shall also be verified on the
drawing. A model test may possibly be required in special cases by
the inspection authority.
3.1.3. In the case of the measuring systems referred to in 2.2 and 2.4, EEC
pattern approval may be granted on the basis of drawings and
diagrams, provided that they comply with the provisions of section 4.1977L0313 — EN — 22.07.1982 — 001.001 — 17
▼M1
▼B
3.2.EECinitial verification
3.2.1.General
3.2.1.1. EEC initial verification of measuring systems may be carried out in
one or two stages.
3.2.1.1.1. It shall be carried out in one stage when the system is entirely manu-
factured by a single manufacturer, can be transported without beingdismantled and when it is verified under the conditions in which it
is intended to be operated.
3.2.1.1.2. It shall be carried out in two stages in all other cases.
The first stage concerns the meter only or the meter fitted with any
ancillary equipment which must be associated with it, whether or not
incorporated in a sub-assembly.
The first-stage tests may be carried out on a test bench (possibly in
the manufacturer's factory) or on the installed measuring system. At
this stage, the metrological examinations may be carried out with
liquids other than those for which the system is intended.
The second stage concerns the measuring system under actual oper-
ating conditions. This shall be carried out at the place of installation,
under operating conditions, and with the liquid for which the system
is intended.
However, the second stage may be carried out in a place selected by
the metrology service concerned when the measuring systems can be
transported without being dismantled and the tests can be carried out
under the conditions in which the measuring system is intended to be
operated.
3.2.2.Tests
3.2.2.1. When EEC initial verification is carried out in one stage, all the tests
referred to in 3.2.2.2 must be performed.
3.2.2.2. When the tests are carried out in two stages:
The first stage shall consist of:
— an examination of the conformity of the meter, including any
ancillary equipment (conformity to the respective patterns),
— a metrological examination of the meter, including built-in ancil-
lary equipment.
The second stage shall consist of:
— an examination of the conformity of the measuring system,
including the meter and ancillary equipment,
— a metrological examination of the meter and ancillary equipment
in the measuring system,
— an operating test on the gas eliminator, if fitted; it shall not be
necessary to check whether the maximum permissible errors for
this device as provided for in 1.6 have been exceeded,
— inspection of the adjustment of the required pressure maintenance
devices,
— verification of variations in the internal volume of hoses in full-
hose systems,
— determination of residual quantities in empty-hose systems.
4. MEASURING SYSTEMS FITTED TO ROAD TANKERS
4.1.General requirements
The measuring systems fitted to road tankers referred to in items 2.2
and 2.4 may obtain EEC pattern approval solely on the basis of an
examination of the documents produced, if the latter are in confor-
mity with one of the standard schemes referred to in item 4.2 and
meet the requirements set out below:
4.1.1. Indication of the standard scheme adopted must be added to the
markings specified in item 1.16.
4.1.2. The components of the measuring system must have received EEC
pattern approval when such approval is specified either in Directive
71/319/EEC of 26 July 1971 relating to meters for liquids other than1977L0313 — EN — 22.07.1982 — 001.001 — 18
▼M1
▼M1
water, Directive 71/348/EEC of 12 October 1971 relating to ancillary
equipment for meters for liquids other than water or in this Directive.
4.1.3. If a tank has several compartments, the outlet pipes from the
compartments may be connected to a measuring system separately
or through a manifold, unless otherwise specified in the relevant stan-
dard scheme. The provisions of the second paragraph of item 2.2.1
shall apply in all cases.
Where a measuring system is connected to several compartments
through a manifold, there shall be a device for preventing several
compartments from communicating withth e measuring system
simultaneously. This requirement does not, however, apply if the
measuring system has a gas separator in conformity with item
1.6.2.1.4.
4.1.4. If a road tanker has two measuring systems which can be connected
as required to one or more specific compartments, the pipes and
valves must be arranged so that the two measuring systems cannot
be connected to the same compartments simultaneously. In addition,
the connections between compartments and measuring systems must
be clearly marked so as to prevent a compartment being mistakenly
connected to a measuring system not designed to measure the
product which it contains.
4.1.5. If an anti-swirl device is specified requirement, it may be combined
with the valve in the bottom of the compartment.
4.1.6. The pipework, valves and taps between compartments and measuring
systems must be arranged in sucha way th at it is impossible to
connect a measuring system to a tank separate from the road tanker.
4.1.7. The filter normally provided immediately upstream of the meter or
the degassing equipment may be incorporated in the latter.
4.1.8. It must be possible to seal devices which allow delivery without
passing through the meter in order to comply with any national
requirements.
4.1.9. Where measuring systems include two-way valves, the latter must be
so designed as to render simultaneous communication between the
three orifices impossible.
4.2.Standardschemes1977L0313 — EN — 22.07.1982 — 001.001 — 19
▼M1
StandardschemeS1
Operationbygravitywithpermanentventatpointoftransfer
Allows:metered delivery only (empty hose) .
1977L0313 — EN — 22.07.1982 — 001.001 — 20
▼M1
KeytostandardschemeS1
If the tank has several compartments, the measuring system must be directly and
permanently connected to a specific compartment without a manifold.
A: Anti-swirl device.
F: Filter. The filter must be designed and installed in such a way that it
can be cleaned without emptying the meter or the sight-glass (V1or
V2respectively).
The whole of the filter must be situated below the level of the point
of transfer.
T1,T2: Variants authorized for gas evacuation.
T1: blow-off valve and non-return valve to prevent admission of gas
into the measuring system.
T2: return to the gaseous phase in the tank compartment.
car: Non-return valve to prevent gas flow in the event of thermal overpres-
sure in the tank.
C: Meter.Vm: Operating valve.
I and II: Variants of the empty-hose delivery system.
V
1: Weir-type sight glass.
V2: Sight glass as defined in item 1.1.8, also serving as a gas indicator.
at: Permanent air vent of sufficient cross-section to ensure that pressure
in the meter is at least equal to atmospheric pressure.
Permanent venting may be provided by a vertical tube without a
valve. If this tube is connected to the top of the tank, the ‘car’ non-
return valve is not needed.
H: Head of liquid.
h: Height of bottom of tank above point of transfer. This must be suffi-
cient to ensure a flow rate at least equal to the meter's minimum flow
rate until the tank is completely empty.1977L0313 — EN — 22.07.1982 — 001.001 — 21
▼M1
StandardschemeS2
Operationbygravitywithoutpermanentventatpointoftransferduringdelivery
Allows: (a) metered delivery (empty hose);
(b) direct unmetered delivery, emptying and filling of the tank without passing through the
meter.
1977L0313 — EN — 22.07.1982 — 001.001 — 22
▼M1
KeytostandardschemeS2
The pipework between compartments and measuring systems must be such as to
ensure permanent connections.
A: Anti-swirl device.
R: Two-way valve allowing metered delivery, unmetered delivery
and emptying and filling of the tank without passing through
the meter.
This valve is optional. It may be replaced by a direct connec-
tion.
F: Filter. A drain valve is authorized only if it includes a non-
return valve preventing any admission of gas to the measuring
system.
PgS: Special gas extractor as defined in item 1.1.5.V
1: Sight glass of special gas extractor.
T1,T2,T3T4: Variants authorized for the venting device.
T1: return to tank.
T2: vent to the atmosphere.
T3: vessel to catchliquid particles entrained by th e gases.
T4: blow-off valve.
C: Meter.va: Valve automatically closed by the special gas extractor when
the pressure is insufficient to prevent vaporization in the meter
or when a gas pocket accumulates in this special gas extractor.
In addition, this valve must close in the event of a failure in its
control system.
I and II: Variants of the empty-hose delivery system.
Variant I: weir-type sight glass V
2.
Variant II: sight glass as defined in item 1.1.8, also
performing the function of a gas indicator V3.
Vm: Operating valve.
The automatic valve va and the operating valve Vm may be
combined in a special valve performing bothfunctions. In th at
case, the two functions must be independent of each other.
In Variant II, this special valve must be placed after the sight
glass V3.
at: Manual vent. It may be automatic (e.g., automatically closed
during the measuring operation and opened on completion
thereof).
H: Head of liquid.
h: Height of bottom of tank above point of transfer. This must be
sufficient to ensure a flow rate at least equal to the meter's
minimum flow rate until the tank is completely empty.1977L0313 — EN — 22.07.1982 — 001.001 — 23
▼M1
StandardschemeS3
The measuring system includes a pump, a gas separator and one or two full hoses.
Allows: (a) metered delivery by pump (full hose);
(b) direct unmetered delivery (with or without pump), emptying and filling of the tank
without passing through the meter.
1977L0313 — EN — 22.07.1982 — 001.001 — 24
▼M1
KeytostandardschemeS3
R1: Two-way valve allowing metered delivery, unmetered delivery and
filling and emptying of the tank without passing through the meter.
This valve is optional. It may be replaced by a direct connection.
P: Pump. The pump may be reversible. In that case, a non-return valve
must be added between the valve R2and the gas separator Sg.
R2: Optional two-way valve, for direct unmetered delivery.
F: Filter. The filter may be fitted with a drain valve.
Sg: Gas separator as defined in item 1.6.2.1.4. The liquid level in the
separator must be higher than that in the meter.
T1,T2: Variants authorized for the venting device.
T1: direct return to the tank.
T2: return to the tank via a vessel to catch liquid particles entrained
by the gases.
C: Meter.Vm: Operating valve.cl: Non-return valve.
fl
1: Full hose on reel.
fl2: Optional second full hose (very short) for delivery at high flow rates.
cla: Valve to prevent the full hose from emptying.
R3: Device allowing deliveries to be made with either hose in a two-hose
measuring system. This device must be in conformity with the first
paragraphof item 1.10.1 and th e second paragraphof item 2.2.4.1977L0313 — EN — 22.07.1982 — 001.001 — 25
▼M1
StandardschemeS4
The measuring system has a pump, a gas separator, one empty hose or one full and one empty hose.
Allows: (a) metered delivery by pump (full or empty hose);
(b) metered gravity-feed delivery (empty hose);
(c) direct unmetered delivery (which or without pump), emptying and filling of the tank
without passing through the meter.
1977L0313 — EN — 22.07.1982 — 001.001 — 26
▼M1
KeytostandardschemeS4
R1: Two-way valve for metered delivery, unmetered delivery and
emptying and filling of the tank without passing through the meter.
This valve is optional. It may be replaced by a direct connection.
P: Pump. The pump may be reversible. In that case, a non-return valve
must be added between valve R2and the gas separator Sg.
B: Optional bypass allowing metered gravity-feed delivery (empty hose).
This bypass is authorized only if there is no valve R1.
R2: Optional two-way valve for direct unmetered delivery.
F: Filter. The filter may be fitted with a drain valve.
Sg: Gas separator as defined in item 1.6.2.1.4. The liquid level in the gas
separator must be above that in the meter.
car: Non-return valve preventing gas flow (in the case of empty hose
delivery).
C: Meter.M: Pressure gauge take-off; this is only compulsory when there is a
bypass B.
This take-off makes it possible to check, during initial verification,
that the pressure in the meter is at least equal to atmospheric pressure
during gravity-feed delivery.
at: Automatic or manual vent. When there is a bypass B, this vent must
be automatic and of sufficient cross-section to ensure that the pressure
in the meter is at least equal to atmospheric pressure.
Vm: Operating valve.
I and II: Variants of the delivery device:
Variant I: empty hose.
Variant II: combinations of one full and one empty hose.
cl: Non-return valve.
V
1: Weir-type sight glass.
V2: Sight glass as defined in item 1.1.8, also serving as a gas indicator.
fl1: Full hose on reel.
cla: Valve to prevent the full hose from emptying.
R3: Device allowing deliveries to be made via either the full or empty
hose. This device must be in conformity with the first paragraph of
item 1.10.1 and the second paragraph of item 2.2.4.1977L0313 — EN — 22.07.1982 — 001.001 — 27
▼M1
StandardschemeS5
The measuring system includes a pump, a gas extractor and one or two full hoses.
It only allows metered deliveries by pump (full hose).
1977L0313 — EN — 22.07.1982 — 001.001 — 28
▼M1
KeytostandardschemeS5
If the tank has several compartments, the measuring system must be directly and
permanently connected to a specific compartment without a manifold.
A: Anti-swirl device.
V:
‘Open or closed’
type valve rendering any slowing-down at the pump intake practically impos-
sible.
M: Pressure gauge to check that the pressure at the pump intake is never less
than atmospheric pressure
P: Pump.
F: Filter.
A drain valve is authorized only if it includes a non-return valve
preventing any admission of gas to the measuring system.
Pg: Gas extractor. Two variants, T1and T2, and authorized for the venting
device.
T1: Direct link between the gas extractor and the tank. In this case the pipe-
work must lead into the tank along the wall in order to facilitate
separation of liquid particles and gases.
T2: Gas extractor connected to the tank by a vessel to catch liquid particles
entrained by the gases.
C: Meter.Vm: Operating valve.cl: Non-return valve.
fl
1: Full hose on reel.
fl2: Optional full second hose (very short) for deliveries at high flow rates.
cla: Valve to prevent the full hose from emptying.
R: Device allowing deliveries to be made with either hose in a two-hose
measuring system. The device must be in conformity with the first para-
graphof item 1.10.1 and th e second paragraphof item 2.2.4.1977L0313 — EN — 22.07.1982 — 001.001 — 29
▼M1
StandardschemeS6
The measuring system includes a gas separator combined with the supply pump, one or two full hoses,
or one empty hose, or one full and one empty hose.
Allows: (a) metered delivery by pump (full or empty hose);
(b) direct delivery with or without pump, without passing through the meter, and emptying
and filling of the tank without passing through the meter.
1977L0313 — EN — 22.07.1982 — 001.001 — 30
▼M1
KeytostandardschemeS6
R1: Two-way valve allowing metered delivery, unmetered delivery and
emptying and filling of the tank without passing through the meter.
This valve is optional. It may be replaced by a direct connection.
F: Filter. The filter may be fitted with a drain valve.
SgP: Gas separator combined with the supply pump as described in the
first paragraph of item 1.6.2.1.2. This subassembly must satisfy the
requirements laid down in item 1.6.2.1.4. It must have received EEC
pattern approval.
cl1: Non-return valve. This valve may be located downstream of the
meter.
R2: Optional two-way valve for direct unmetered delivery.
C: Meter.
I, II, III: Variants of the delivery device:
Variant I: one or two full hoses;
Variant II: empty hose;
Variant III: combinations of one full and one empty hose.
Vm: Operating valve.
V1: Weir-type sight glass.
V2: Sight glass as defined in item 1.1.8, also serving as a gas indicator.
fl1: Full hose.
fl2: Optional second full hose (very short) for deliveries at high flow
rates.
cla: Valve to prevent the full hose from emptying.cl
2: Non-return valve.
at: Automatic or manual air vent.
R3: Device allowing deliveries to be made by either of two available
delivery methods. This device must be in conformity with the first
paragraphof item 1.10.1 and th e second paragraphof item 2.2.4.1977L0313 — EN — 22.07.1982 — 001.001 — 31
▼M1
StandardschemeS7
The measuring system includes a pump, a special gas extractor, one or two full hoses, or one empty
hose or one full hose and one empty hose.
Allows: (a) metered delivery by pump (full or empty hose);
(b) metered gravity-feed delivery (empty hose);
(c) direct delivery with or without pump, without passing through the meter, and emptying
and filling of the tank without passing through the meter.
1977L0313 — EN — 22.07.1982 — 001.001 — 32
▼M1
KeytostandardschemeS7
If the tank has several compartments and if it is possible to use a manifold, the
valves in the bottom of the compartments and the valves on the intake pipe must
be of the ‘open or closed’ type. Pipes between compartments and the measuring
system must be permanently connected.
A: Anti-swirl device.
R1: Two-way valve allowing metered delivery, unmetered delivery and
emptying and filling of the tank without passing through the
meter.
This valve is optional. It may be replaced by a direct connection.
P: Pump. The pump may be reversible. In that case, a non-return
valve must be incorporated between the valve R2and the special
gas extractor PgS.
B: Optional bypass allowing metered gravity-feed delivery (empty
hose). This bypass is authorized only if there is no valve R1.
R2: Optional two-way valve for direct unmetered delivery.
F: Filter. A drain valve is authorized only if it includes a non-return
valve preventing any admission of gas to the measuring system.
PgS: Special gas extractor as defined in item 1.1.5.
V1: Sight glass of special gas extractor.
T1,T2,T3: Variants authorized for the venting device.
T1: vessel to catchliquid particles entrained by th e gases.
T2: return to the tank.
T2: blow-off valve.
C: Meter.va: Valve automatically closed by the special gas extractor when the
pressure is insufficient to prevent vaporization in the meter or
when a gas pocket accumulates in the extractor. In addition, this
valve must close in the event of a failure in its control system.
I, II, III: Variants of the delivery device.
Variant I: one or two full hoses;
Variant II: empty hose;Variant III: combinations of one full and one empty hose.
Vm: Operating valve.
The automatic valve va and the operating valve Vm may be
combined in a special valve performing bothfunctions. In th at
case, the two functions must be independent of each other. This
special valve must be placed downstream of the sight glass V
3in
those variants (II and III) which include the latter.
cl: Non-return valve.V
2: Weir-type sight glass.
V3: Sight glass as defined in item 1.1.8, also serving as a gas indicator.
fl1: Full hose on reel.
fl2: Optional second full hose (very short) for delivery at high flow
rates.
cla: Valve preventing the full hose from emptying.at: Automatic or manual air vent.R
3: Device allowing deliveries to be made by either of two available
delivery methods. This device must be in conformity with the first
paragraphof item 1.10.1 and th e second paragraphof item 2.2.4.1977L0313 — EN — 22.07.1982 — 001.001 — 33
▼M1
StandardschemeS8
The measuring system includes a pump, a three-way valve, a special gas extractor, one or two full
hoses, or one empty hose or one full and one empty hose.
Allows: (a) metered delivery by pump (full or empty hose);
(b) gravity-feed metered delivery (empty hose);
(c) direct delivery with or without pump, without passing through the meter, and emptying
and filling of the tank without passing through the meter.
1977L0313 — EN — 22.07.1982 — 001.001 — 34
▼M1
KeytostandardschemeS8
If the tank has several compartments and if it is possible to use a manifold, the
valves in the bottom of the compartments and the valves on the intake pipe must
be of the ‘open or closed’ type. Pipes between compartments and the measuring
system must be permanently connected.
A: Anti-swirl device.
P: Pump.R
0: Three-way valve which, in conjunction with valves R1and R2,
enables the following operations to be carried out:
1. Metered or unmetered delivery by pump (full or empty hose);
2. Gravity-feed metered or unmetered delivery (empty hose),
emptying and filling of the tank;
3. Filling of the tank with the aid of pump P.
R1: This two-way valve is optional. It may be replaced by a direct
connection.
F: Filter:
A drain valve is authorized only if it includes a non-return valve
preventing any admission of gas to the measuring system
cl1: Non-return valve.
PgS: Special gas extractor as defined in item 1.1.5.
V1: Sight glass for special gas extractor.
T1,T2,T3: Variants authorized for the venting device.
T1: vessel to catchliquid particles entrained by th e gases.
T2: return to the tank.
T3: blow-off valve.
C: Meter.
va: Valve automatically closed by the special gas extractor when the
pressure is insufficient to prevent vaporization in the meter or
when a gas pocket accumulates in the extractor. In addition, this
valve must close in the event of a failure in its control system.
I, II, III: Variants of the delivery device.
Variant I: one or two full hoses.
Variant II: empty hose.Variant III: combinations of one full and one empty hose.
Vm: Operating valve.
The automatic valve va and the operating valve Vm may be
combined in a special valve performing bothfunctions. In th at
case, the two functions must be independent of each other. This
special valve must be placed downstream of the sight glass V
3in
those variants (II and III) which include the latter.
cl2: Non-return valve.
V2: Weir-type sight glass.
V3: Sight glass as defined in item 1.1.8 also acting as a gas indicator.
fl1: Full hose on reel.
fl2: Optional second full hose (very short) for delivery at high flow
rates.
cla: Valve preventing the full hose from emptying.at: Automatic or manual venting.
R
2: Device allowing deliveries to be made by either of two available
delivery methods. This device must be in conformity with the first
paragraphof item 1.10.1 and th e second paragraphof item 2.2.4.1977L0313 — EN — 22.07.1982 — 001.001 — 35
▼M1
StandardschemeS9
The measuring system includes a pump, a gas separator, a pressure-maintaining valve and a full hose.
Allows: (a) metered delivery by pump (full hose);
(b) delivery with or without pump, without passing through the meter, and emptying and
filling of the tank without passing through the meter.
1977L0313 — EN — 22.07.1982 — 001.001 — 36
▼M1
KeytostandardschemeS9
R1: Two-way valve for metered delivery, emptying and filling of the tank
without passing through the meter.
This valve is optional. It may be replaced by a direct connection.
P: Pump.
B: Adjustable pump bypass connected to the tank.
R2: Optional two-way valve for direct unmetered delivery.
cl1: Non-return valve stipulated in item 2.4.1. It may also be positioned
between the filter and gas separator.
F: Filter.Sg: Gas separator in conformity with either item 1.6.2.1.4 or the second
paragraph of item 2.4.3.1. The venting device is connected to the
gaseous phase of the tank. For safety reasons, a valve vas may be fitted
to this device; in that case, it must be fitted between the tank and the
branchto th e valve ‘vamp’.
C: Meter.
vamp: Automatic pressure-maintaining valve adjusted to maintain a pressure at
least 100 kPa higher than the saturated vapour pressure in the tank.
Vm: Operating valve.
cl
2: Non-return valve.
Z: Gaseous-phase pipe which may be used only to fill the vehicle tank and
recover the product during checking of the measuring system.
Th: Thermometer. This thermometer must be situated near the meter, either
in the gas separator or at the meter inlet or outlet.
M: Compulsory pressure gauge.M
0: Optional pressure gauges.
Note:(a) to ensure that the requirements stipulated in item 2.4.5 are observed,
it must be clearly stated on a plate that the gaseous phases in the
vehicle tank and customer's tank must not be connected.
(b) Safety valves may be incorporated; in that case, they must comply
withth e requirements of item 2.4.6.1977L0313 — EN — 22.07.1982 — 001.001 — 37