Section 3.32. Liquefied Petroleum Gas and Anhydrous Ammonia

**Liquid-Measuring Devices**[^1]

**A. Application.**

**A.1.** - This code applies to devices used for the measurement of
liquefied petroleum gas and anhydrous ammonia in the liquid state,
whether such devices are installed in a permanent location or mounted on
a vehicle.

**A.2.** - Insofar as they are clearly appropriate, the requirements and
provisions of the code may be applied to devices used for the
measurement of other liquids that do not remain in a liquid state at
atmospheric pressures and tempera­tures.

**A.3.** - See also Sec. 1.10; General Code requirements.

**A.4.** - This code does not apply to mass flow meters (see Sec. 3.37.
Code for Mass Flow Meters).

(Added 1994)

# S. Specifications

**S.1. Design of Indicating and Recording Elements and of Recorded
Representations.**

## S.1.1. Primary Elements

> **S.1.1.1. General.** - A device shall be equipped with a primary
> indicating element and may also be equipped with a primary recording
> element.
>
> \[**Note**: Vehicle-mounted metering systems shall be equipped with a
> primary recording element as required by Paragraph UR.2.6.\]
>
> **S.1.1.2. Units.** - A device shall indicate, and record if the
> device is equipped to record, its deliveries in terms of liters,
> gallons, quarts, pints, or binary-submultiple or decimal subdivi­sions
> of the liter or gallon.
>
> (Amended 1987)
>
> **S.1.1.3. Value of Smallest Unit.** - The value of the smallest unit
> of indicated delivery, and recorded delivery if the device is equipped
> to record, shall not exceed the equivalent of:

\(a\) 0.5 L (1 pt) on retail devices, or

\(b\) 5 L (1 gal) on wholesale devices.

> (Amended 1987)
>
> **S.1.1.4. Advancement of Indicating and Recording Elements.** -
> Primary indicating and record­ing elements shall be susceptible to
> advancement only by the mechanical operation of the device. However, a
> device may be cleared by advancing its elements to zero, but only if:

\(a\) the advancing movement, once started, cannot be stopped until zero
is reached, or

\(b\) in the case of indicating elements only, such elements are
automatically obscured until the elements reach the correct zero
position.

> **S.1.1.5. Money Values\--Mathematical Agreement.** - Any digital
> money-value indication and any recorded money value on a
> computing-type device shall be in mathematical agreement with its
> associated quantity indication or representation to within 1 cent of
> money value; except that a stationary retail computing-type device
> must compute and indicate to the nearest 1 cent of money value (see
> Sec. 1.10., G-S.5.5.).
>
> (Amended 1984 and 1988)
>
> **S.1.1.6. Printed Ticket.** - Any printed ticket issued by a device
> of the computing type on which there is printed the total computed
> price, shall have printed clearly thereon the total volume of the
> delivery in terms of liters or gallons, and the appropriate decimal
> fraction of the liter or gallon, and the corresponding price per liter
> or gallon.
>
> (Added 1979) (Amended 1987)
>
> **S.1.2. Graduations.**
>
> **S.1.2.1. Length.** - Graduations shall be so varied in length that
> they may be conveniently read.
>
> **S.1.2.2. Width.** - In any series of graduations, the width of a
> gradua­tion shall in no case be greater than the width of the minimum
> clear interval between graduations, and the width of main graduations
> shall be not more than 50 % greater than the width of subor­dinate
> graduations. Gradua­tions shall in no case be less than 0.2 mm
> (0.008 in) width.
>
> **S.1.2.3. Clear Interval Between Graduations.** - The clear interval
> shall be not less than 1.0 mm (0.04 in). If the graduations are not
> parallel, the measurement shall be made:
>
> \(a\) along the line of relative movement between the graduations at
> the end of the indicator, or
>
> \(b\) if the indicator is continuous, at the point of widest
> separation of the graduations.
>
> **S.1.3. Indicators.**
>
> **S.1.3.1. Symmetry.** - The index of an indicator shall be
> symmetrical with respect to the graduations, at least throughout that
> portion of its length associated with the graduations.
>
> **S.1.3.2. Length.** - The index of an indicator shall reach to the
> finest graduations with which it is used, unless the indicator and the
> gradua­tions are in the same plane, in which case the distance between
> the end of the indicator and the ends of the graduations, measured
> along the line of graduations, shall be not more than 1.0 mm
> (0.04 in).
>
> **S.1.3.3. Width.** - The width of the index of an indicator in
> relation to the series of graduations with which it is used shall be
> not greater than:
>
> \(a\) *the width of the narrowest graduation\** , and
>
> *\[\*Nonretroactive as of January 1, 2002\]*
>
> (Amended 2001)
>
> \(b\) the width of the minimum clear interval between graduations.
>
> When the index of an indicator extends along the entire length of a
> graduation, that portion of the index of the indicator that may be
> brought into coincidence with the graduation shall be of the same
> width throughout the length of the index that coincides with the
> graduation.
>
> **S.1.3.4. Clearance.** - The clearance between the index of an
> indicator and the graduations shall in no case be more than 1.5 mm
> (0.06 in).
>
> **S.1.3.5. Parallax.** - Parallax effects shall be reduced to the
> practicable minimum.
>
> **S.1.4. For Retail Devices Only.**
>
> **S.1.4.1. Indication of Delivery.** - A retail device shall be
> constructed to show automatically its initial zero condition and the
> amounts delivered up to the nominal capacity of the device.
>
> **S.1.4.2. Return to Zero.** -
>
> \(a\) Primary indicating elements shall be readily returnable to a
> definite zero indication.
>
> \(b\) Primary recording elements on a stationary retail device shall
> be readily returnable to a definite zero indication if the device is
> equipped to record.
>
> \(c\) Means shall be provided to prevent the return of primary
> indicating elements, and of primary recording elements if these are
> returnable to zero, beyond their correct zero position.
>
> (Amended 1990)
>
> **S.1.5. For Stationary Retail Devices Only.**
>
> **S.1.5.1. Display of Unit Price and Product Identity.** - In a device
> of the computing type, means shall be provided for displaying on each
> face of the device the unit price at which the device is set to
> compute or to deliver as the case may be, and there shall be
> conspicuously displayed on each side of the device the identity of the
> product that is being dis­pensed. If a device is so designed as to
> dispense more than one grade, brand, blend, or mixture of product, the
> identity of the grade, brand, blend, or mixture being dispensed shall
> also be displayed on each face of the device.
>
> **S.1.5.2. Money-Value Computations.** - A computing device shall
> compute the total sales price at any single-purchase unit price
> (excluding fleet sales and other price contract sales) for which the
> product is offered for sale at any delivery possible within either the
> measurement range of the device or the range of the computing
> elements, whichever is less. The analog money value indication shall
> not differ from the mathematically computed money value (quantity x
> unit price = sales price), for any delivered quantity, by an amount
> greater than the values shown in Table 1.
>
> (Amended 1995)

+---------------+-----------------+----------+---------+-------------+
| **Table 1.**  |                 |          |         |             |
|               |                 |          |         |             |
| **Money-Value |                 |          |         |             |
| Divisions     |                 |          |         |             |
| and**         |                 |          |         |             |
|               |                 |          |         |             |
| **Maximum     |                 |          |         |             |
| Allowable     |                 |          |         |             |
| Variations    |                 |          |         |             |
| for           |                 |          |         |             |
| Money-Value** |                 |          |         |             |
|               |                 |          |         |             |
| *             |                 |          |         |             |
| *Computations |                 |          |         |             |
| on Mechanical |                 |          |         |             |
| Analog        |                 |          |         |             |
| Computers**   |                 |          |         |             |
+---------------+-----------------+----------+---------+-------------+
| **Unit        |                 | **Money  | **Ma    |             |
| Price**       |                 | Value**  | ximum** |             |
|               |                 |          |         |             |
|               |                 | **Di     | **Al    |             |
|               |                 | vision** | lowable |             |
|               |                 |          | Vari    |             |
|               |                 |          | ation** |             |
+---------------+-----------------+----------+---------+-------------+
| **From**      | **To and        |          | **D     | **Field**   |
|               | Including**     |          | esign** |             |
|               |                 |          |         | **Test**    |
|               |                 |          | *       |             |
|               |                 |          | *Test** |             |
+---------------+-----------------+----------+---------+-------------+
| 0             | \$0.25/liter or | 1¢       | ± 1¢    | ± 1¢        |
|               |                 |          |         |             |
|               | \$1.00/gallon   |          |         |             |
+---------------+-----------------+----------+---------+-------------+
| \$0.25/liter  | \$0.75/liter or | 1¢ or 2¢ | ± 1¢    | ± 2¢        |
| or            |                 |          |         |             |
|               | \$3.00/gallon   |          |         |             |
| \$1.00/gallon |                 |          |         |             |
+---------------+-----------------+----------+---------+-------------+
| \$0.75/liter  | \$2.50/liter or | 1¢ or 2¢ | ± 1¢    | ± 2¢        |
| or            |                 |          |         |             |
|               | \$10.00/gallon  |          |         |             |
| \$3.00/gallon |                 |          |         |             |
+---------------+-----------------+----------+---------+-------------+
| \$0.75/liter  | \$2.50/liter or | 5¢       | ± 2½¢   | ± 5¢        |
| or            |                 |          |         |             |
|               | \$10.00/gallon  |          |         |             |
| \$3.00/gallon |                 |          |         |             |
+---------------+-----------------+----------+---------+-------------+

> **S.1.5.2.1. Money-Value Divisions, Analog.** - The value of the
> graduated intervals representing money values on a computing-type
> device with analog indications shall be as follows:
>
> \(a\) Not more than 1 cent at all unit prices up to and including
> \$0.25 per liter or \$1.00 per gallon.
>
> \(b\) Not more than 2 cents at unit prices greater than \$0.25 per
> liter or \$1.00 per gallon up to and including \$0.75 per liter or
> \$3.00 per gallon.
>
> \(c\) Not more than 5 cents at all unit prices greater than \$0.75 per
> liter or \$3.00 per gallon.
>
> (Amended 1984)
>
> **S.1.5.2.2. Money-Value Divisions, Digital.** - A computing-type
> device with digital indications shall comply with the requirements of
> Paragraph G.-S.5.5., Money Values, Mathematical Agree­ment, and the
> total price computation shall be based on quantities not exceeding
> 0.01-gallon intervals for devices indicating in inch-pound units and
> 0.05 liter for devices indicating in metric units.
>
> ***S.1.5.2.3. Money-Value Divisions, Auxiliary Indications.** - In a
> system equipped with auxiliary indications, all indicated money-value
> divisions shall be identical.*
>
> *\[Nonretroactive as of January 1, 1985.\]*
>
> **S.1.6. For Wholesale Devices Only.**
>
> **S.1.6.1. Travel of Indicator.** - A wholesale device shall be
> readily operable to deliver accurately any quantity from 180 L
> (50 gal) to the capacity of the device. If the most sensitive element
> of the indicating system uses an indicator and graduations, the
> relative movement of these parts corresponding to a delivery of 5 L
> (1 gal) shall be not less than 5 mm (0.20 in).
>
> (Amended 1987)

**S.2. Design of Measuring Elements.**

> **S.2.1. Vapor Elimination.** - A device shall be equipped with an
> effective vapor eliminator or other effective means to prevent the
> passage of vapor through the meter.
>
> **S.2.2. Provision for Sealing.** - Adequate provision shall be made
> for an approved means of security (e.g., data change audit trail) or
> for physically applying a security seal in such a manner that requires
> the security seal to be broken before an adjustment or interchange may
> be made of:
>
> \(a\) any measuring or indicating element;

(b) any adjustable element for controlling delivery rate, when such rate
    tends to affect the accuracy of deliveries; and

(c) any metrological parameter that will affect the metrological
    integrity of the device or system.

> When applicable, the adjusting mechanism shall be readily accessible
> for purposes of affixing a security seal.

*\[Audit trails shall use the format set forth in Table S.2.2.\]\**

*\[\*Nonretroactive as of January 1, 1995\]*

(Amended 2006)

+-----------------------------------+----------------------------------+
| ***Table S.2.2. Categories of     |                                  |
| Device and Methods of Sealing***  |                                  |
+-----------------------------------+----------------------------------+
| ***Category of Device***          | ***Method of Sealing***          |
+-----------------------------------+----------------------------------+
| *Category 1: No remote            | *Seal by physical seal or two*   |
| configuration capability.*        | *event counters: one for         |
|                                   | calibration parameters and one   |
|                                   | for configuration parameters.*   |
+-----------------------------------+----------------------------------+
| *Category 2: Remote configuration | *The hardware enabling access    |
| capability, but access is         | for remote communication must be |
| controlled by physical hardware.* | on-site. The hardware must be    |
|                                   | sealed using a physical seal or  |
| *The device shall clearly         | an event counter for calibration |
| indicate that it is in the remote | parameters and an event counter  |
| configuration mode and record     | for configuration parameters.    |
| such message if capable of        | The event counters may be        |
| printing in this mode or shall    | located either at the individual |
| not operate while in this mode.*  | measuring device or at the       |
|                                   | system controller; however, an   |
|                                   | adequate number of counters must |
|                                   | be provided to monitor the       |
|                                   | calibration and configuration    |
|                                   | parameters of the individual     |
|                                   | devices at a location. If the    |
|                                   | counters are located in the      |
|                                   | system controller rather than at |
|                                   | the individual device, means     |
|                                   | must be provided to generate a   |
|                                   | hard copy of the information     |
|                                   | through an on-site device.*      |
+-----------------------------------+----------------------------------+
| *Category 3: Remote configuration | *An event logger is required in  |
| capability access may be          | the device; it must include an   |
| unlimited or controlled through a | event counter (000 to 999), the  |
| software switch (e.g.,            | parameter ID, the date and time  |
| password)*.                       | of the change, and the new value |
|                                   | of the parameter. A printed copy |
| *The device shall clearly         | of the information must be       |
| indicate that it is in the remote | available through the device or  |
| configuration mode and record     | through another on‑site device.  |
| such message if capable of        | The event logger shall have a    |
| printing in this mode or shall    | capacity to retain records equal |
| not operate while in this mode.*  | to ten times the number of       |
|                                   | sealable parameters in the       |
|                                   | device, but not more than        |
|                                   | 1000 records are required.       |
|                                   | (**Note:** Does not require      |
|                                   | 1000 changes to be stored for    |
|                                   | each parameter.)*                |
+-----------------------------------+----------------------------------+
| *\[Nonretroactive as of January   |                                  |
| 1, 1995\]*                        |                                  |
|                                   |                                  |
| (Table Added 2006)                |                                  |
+-----------------------------------+----------------------------------+

> **S.2.3. Directional Flow Valves.** - A measuring system shall be
> equi­pped with a valve or other effective means, automatic in operation
> and installed in or adjacent to the measuring element, to prevent
> reversal of flow of the product being measured.
>
> (Amended 1982)
>
> **S.2.4. Maintenance of Liquid State.** - A device shall be so
> designed and installed that the product being measured will remain in
> a liquid state during the passage through the meter.
>
> **S.2.5. Thermometer Well.** - For test purposes, means shall be
> provided to determine the temperature of the liquid either:
>
> \(a\) in the liquid chamber of the meter, or
>
> \(b\) in the meter inlet or discharge line and immediately adjacent to
> the meter.
>
> (Amended 1987)
>
> **S.2.6. Automatic Temperature Compensation.** - A device may be
> equipped with an adjustable automatic means for adjusting the
> indication and registration of the measured volume of product to the
> volume at 15 °C (60 °F).
>
> **S.2.6.1. Provision for Deactivating.** - On a device equipped with
> an automatic temperature-compensating mechanism that will indicate or
> record only in terms of liters or gallons adjusted to 15 °C (60 °F),
> provision shall be made to facilitate the deactivation of the
> automatic temperature-compensating mechanism so that the meter may
> indicate, and record if it is equipped to record, in terms of the
> uncompensated volume.
>
> (Amended 1972)
>
> **S.2.6.2. Provision for Sealing.** - Provision shall be made for
> applying security seals in such a manner that an automatic
> tempera­ture-compensating system cannot be disconnected and that no
> adjust­ment may be made to the system.

**S.3. Design of Discharge Lines and Discharge Line Valves.**

> **S.3.1. Diversion of Measured Liquid.** - No means shall be provided
> by which any measured liquid can be diverted from the measuring
> chamber of the meter or the discharge line therefrom. However, two or
> more delivery outlets may be permanently installed if means are
> provided to insure that:
>
> \(a\) liquid can flow from only one such outlet at one time, and
>
> \(b\) the direction of flow for which the mechanism may be set at any
> time is definitely and conspicuously indicated.
>
> In addition, a manually controlled outlet that may be opened for the
> purpose of emptying a portion of the system to allow for repair and
> maintenance opera­tions shall be permitted. Effective means shall be
> provided to prevent the passage of liquid through any such outlet
> during normal operation of the device and to indicate clearly and
> unmistakably when the valve controls are so set as to permit passage
> of liquid through such outlet.
>
> (Amended 1975)
>
> **S.3.2. Delivery Hose.** - The delivery hose of a retail device shall
> be of the wet-hose type with a shutoff valve at its outlet end.

**S.4. Marking Requirements.**

> **S.4.1. Limitation of Use.** - If a device is intended to measure
> accurately only products having particular properties, or to measure
> accurately only under specific installation or operating conditions,
> or to measure accurately only when used in conjunction with specific
> accessory equipment, these limitations shall be clearly and
> permanently stated on the device.
>
> **S.4.2. Discharge Rates.** - A device shall be marked to show its
> designed maximum and minimum discharge rates. The marked minimum
> discharge rate shall not exceed:
>
> \(a\) 20 L (5 gal) per minute for stationary retail devices, or
>
> \(b\) 20 % of the marked maximum discharge rate for other retail
> devices and for wholesale devices.
>
> (Amended 1987)
>
> **Note**: See example in Section 3.30. Liquid-Measuring Devices Code,
> Paragraph S.4.4.1.
>
> (Added 2003)
>
> ***S.4.3. Location of Marking Information;** **Retail Motor-Fuel
> Dispensers.** - The marking information required in General Code,
> Paragraph G‑S.1. Identification shall appear as follows:*

(a) *within 60 cm (24 in) to 150 cm (60 in) from the base of the
    dispenser;*

(b) *either internally and/or externally provided the information is
    permanent and easily read; and*

(c) *on a portion of the device that cannot be readily removed or
    interchanged (i.e., not on a service access panel).*

> **Note:** The use of a dispenser key or tool to access internal
> marking information is permitted for retail motor-fuel dispensers.
>
> *\[Nonretroactive as of January 1, 2003\]*
>
> (Added 2006)
>
> **S.4.4. Temperature Compensation.** - If a device is equipped with an
> automatic temperature compensator, the primary indicating elements,
> record­ing elements, and recorded representation shall be clearly and
> conspicuously marked to show that the volume delivered has been
> adjusted to the volume at 15 °C (60 °F).

# N. Notes

**N.1. Test Liquid.** - A device shall be tested with the liquid to be
commercially measured or with a liquid of the same general physical
characteristics.

**N.2. Vaporization and Volume Change.** - Care shall be exercised to
reduce to a minimum, vaporization and volume changes.

**N.3. Test Drafts.** - Test drafts should be equal to at least the
amount del­ivered by the device in 1 minute at its normal discharge rate.

(Amended 1982)

**N.4. Testing Procedures.**

> **N.4.1. Normal Tests.** - The \"normal\" test of a device shall be
> made at the maximum discharge flow rate developed under the conditions
> of the installa­tion. Any additional tests conducted at flow rates down
> to and including one-half the sum of the maximum discharge flow rate
> and the rated minimum discharge flow rate shall be considered normal
> tests.
>
> (Amended 1998)
>
> **N.4.1.1. Automatic Temperature Compensation.** - On devices equipped
> with automatic temperature-compensating systems, normal tests shall be
> conducted as follows:
>
> \(a\) by comparing the compensated volume indicated or recorded to the
> actual delivered volume adjusted to 15 °C (60 °F); and,
>
> \(b\) with the temperature-compensating system deactivated, comparing
> the uncompensated volume indicated or recorded to the actual delivered
> volume.
>
> The first test shall be performed with the automatic
> temperature-compen­sating system operating in the \"as found\"
> condition. On devices that indicate or record both the compensated and
> uncompensated volume for each delivery, the tests in (a) and (b) may
> be performed as a single test.
>
> (Amended 1987)
>
> **N.4.1.2. Repeatability Tests. -** Tests for repeatability should
> include a minimum of three consecutive test drafts of approximately
> the same size and be conducted under controlled conditions where
> variations in factors such as temperature, pressure, and flow rate are
> reduced to the extent that they will not affect the results obtained.
>
> (Added 2001)
>
> **N.4.2. Special Tests.** - \"Special\" tests shall be made to develop
> the operating characteristics of a device and any special elements and
> accessories attached to or associated with the device. Any test except
> as set forth in N.4.1. shall be considered a special test.
>
> **N.4.2.1. For Motor-Fuel Devices.** - A motor-fuel device shall be so
> tested at a minimum discharge rate of:
>
> \(a\) 20 L (5 gal) per minute, or
>
> \(b\) the minimum discharge rate marked on the device, whichever is
> less.
>
> **N.4.2.2. For Other Retail Devices.** - A retail device other than a
> motor-fuel device shall be tested at a minimum discharge rate of:
>
> \(a\) the minimum discharge rate that can be developed under the
> conditions of installation, or
>
> \(b\) the minimum discharge rate marked on the device, whichever is
> greater.
>
> (Amended 1973)
>
> **N.4.2.3. For Wholesale Devices.** - A wholesale device shall be so
> tested at a minimum discharge rate of:

\(a\) 40 L (10 gal) per minute for a device with a rated maximum
dis­charge less than 180 L (50 gal) per minute.

> \(b\) 20 % of the marked maximum discharge rate for a device with a
> rated maximum discharge of 180 L (50 gal) per minute or more, or
>
> \(c\) the minimum discharge rate marked on the device, whichever is
> least.
>
> (Amended 1987)
>
> **N.4.3. Money-Value Computation Tests.**
>
> **N.4.3.1. Laboratory Design Evaluation Tests.** - In the conduct of
> laboratory design evaluation tests, compliance with Paragraph S.1.5.2.
> shall be determined by using the cone gear as a reference for the
> total quantity delivered. The indicated delivered quantity shall agree
> with the cone gear representation with the index of the indicator
> within the width of the graduation. The maximum allowable variation of
> the indicated sales price shall be as shown in Table 1.
>
> **N.4.3.2. Field Tests.** - In the conduct of field tests to determine
> com­pliance with Paragraph S.1.5.2. the maximum allowable variation in
> the indicated sales price shall be as shown in Table 1.
>
> (Added 1984)

**N.5. Temperature Correction.** - Adjustments shall be made for any
changes in volume resulting from the differences in liquid temperatures
between time of passage through the meter and time of volumetric
determination in the test measure.

# T. Tolerances

**T.1. Application.**

> **T.1.1. To Underregistration and to Overregistration.** - The
> tol­erances hereinafter prescribed shall be applied to errors of
> underregistration and errors of overregistration, whether or not a
> device is equipped with an automatic temperature compensator.

**T.2. Tolerance Values.** - The maintenance and acceptance tolerances
for normal and special tests shall be as shown in Table T.2.

(Amended 2003)

+-------+-------------------------------+---------+---------+--------+
| ##### |                               |         |         |        |
| ## Ta |                               |         |         |        |
| ble T |                               |         |         |        |
| .2. A |                               |         |         |        |
| ccura |                               |         |         |        |
| cy Cl |                               |         |         |        |
| asses |                               |         |         |        |
|  and  |                               |         |         |        |
| Toler |                               |         |         |        |
| ances |                               |         |         |        |
|  for  |                               |         |         |        |
| LPG a |                               |         |         |        |
| nd An |                               |         |         |        |
| hydro |                               |         |         |        |
| us Am |                               |         |         |        |
| monia |                               |         |         |        |
|  Liqu |                               |         |         |        |
| id-Me |                               |         |         |        |
| asuri |                               |         |         |        |
| ng De |                               |         |         |        |
| vices |                               |         |         |        |
+-------+-------------------------------+---------+---------+--------+
| **Acc | **Application**               | **Acc   | **Main  | **S    |
| uracy |                               | eptance | tenance | pecial |
| Cl    |                               | Tole    | Tole    | Test   |
| ass** |                               | rance** | rance** | Toler  |
|       |                               |         |         | ance** |
+-------+-------------------------------+---------+---------+--------+
| 1.0   | Anhydrous ammonia, LPG        | 0.6 %   | 1.0 %   | 1.0 %  |
|       | (including vehicle‑mounted    |         |         |        |
|       | meters)                       |         |         |        |
+-------+-------------------------------+---------+---------+--------+
| (     |                               |         |         |        |
| Added |                               |         |         |        |
| 2003) |                               |         |         |        |
+-------+-------------------------------+---------+---------+--------+

**T.3. Repeatability.** - When multiple tests are conducted at
approximately the same flow rate and draft size, the range of the test
results for the flow rate shall not exceed 40 % of the absolute value of
the maintenance tolerance and the results of each test shall be within
applicable tolerance. This tolerance does not apply to the test of the
automatic temperature-compensating system. See also N.4.1.2.

(Added 1992) (Amended 1997 and 2001)

**T.4. Automatic Temperature-Compensating Systems.** - The difference
between the meter error (expressed as a percentage) for results
determined with and without the automatic temperature-compensating
system activated shall not exceed:

> \(a\) 1.0 % for mechanical automatic temperature-compensating systems;
> and
>
> \(b\) 0.5 % for electronic automatic temperature-compensating systems.

The delivered quantities for each test shall be approximately the same
size. The results of each test shall be within the applicable acceptance
or maintenance tolerance.

(Added 1991) (Amended 1992, 1996, and 1997)

# UR. User Requirements

**UR.1. Installation Requirements.**

> **UR.1.1. Discharge Rate.** - A device shall be so installed that the
> actual maximum discharge rate will not exceed the rated maximum
> discharge rate. If necessary, means for flow regulation shall be
> incorporated in the installation, in which case this shall be fully
> effective and automatic in operation.
>
> **UR.1.2. Length of Discharge Hose.** - The length of the discharge
> hose on a stationary motor-fuel device shall not exceed 5.5 m (18 ft),
> measured from the outside of the housing of the device to the inlet
> end of the discharge nozzle, unless it can be demonstrated that a
> longer hose is essential to permit deliveries to be made to receiving
> vehicles or vessels. Unnecessarily remote location of a device shall
> not be accepted as justification for an abnormally long hose.
>
> (Amended 1991)

**UR.2. Use Requirements.**

> **UR.2.1. Return of Indication and Recording Elements to Zero.** - The
> primary indicating elements (visual), and the primary recording
> ele­ments when these are returnable to zero, shall be returned to zero
> before each deliv­ery.
>
> **UR.2.2. Condition of Fill of Discharge Hose.** - The discharge hose
> shall be completely filled with liquid before the \"zero\" condition
> is established prior to the start of a commercial delivery, whether
> this condi­tion is established by resetting the primary indicating
> elements to zero indication or by recording the indications of the
> primary indicating elements. (Also see UR.2.1.)
>
> **UR.2.3. Vapor-Return Line.** - During any metered delivery of
> liquefied petroleum gas from a supplier\'s tank to a receiving
> container, there shall be no vapor-return line from the receiving
> container to the supplier\'s tank:

\(a\) in the case of any receiving container to which normal deliveries
can be made without the use of such vapor-return line, or

> \(b\) in the case of any new receiving container when the ambient
> tempera­ture is below 90 °F.
>
> **UR.2.4. Temperature Compensation.**
>
> **UR.2.4.1. Use of Automatic Temperature Compensators.** - If a device
> is equipped with an automatic temperature compen­sator, this shall be
> connected, operable, and in use at all times. Such auto­matic
> temperature compensator may not be removed, nor may a compen­sated
> device be replaced with an uncompensated device, without the written
> approval of the weights and measures authority having jurisdic­tion
> over the device.
>
> **UR.2.4.2. Temperature Compensated Sale.** - All sales of liquefied
> petroleum gas in a liquid state, when the quantity is determined by an
> approved measuring system equipped with a temperature-compensating
> mechanism, or by weight and converted to liters or gallons, or by a
> cali­brated container, shall be in terms of liters or the U. S. gallon
> of 231 in^3^ at 15 °C (60 °F).

(Added 1984)

> **UR.2.4.3. Invoices.** - Any invoice based on a reading of a device
> that is equipped with an automatic temperature compensator or based on
> a weight converted to gallons, or based on the volume of a cali­brated
> container, shall have shown thereon that the volume delivered has been
> adjusted to the volume at 15 °C (60 °F).
>
> (Amended 1984)
>
> **UR.2.4.4. Automated Temperature-Compensating Systems.** - Means for
> determining the temperature of measured liquid in an automatic
> temperature-compensating system shall be so designed and located that,
> in any \"usual and customary\" use of the system, the resulting
> indications and/or recorded representations are within applicable
> tolerances.
>
> (Added 1987)
>
> **UR.2.5. Ticket in Printing Device.** - A ticket shall not be
> inserted into a device equipped with a ticket printer until
> immediately before a delivery is begun, and in no case shall a ticket
> be in the device when the vehicle is in motion while on a public
> street, highway, or thoroughfare.
>
> **UR.2.6. Ticket Printer; Customer Ticket.** - Vehicle-mounted
> metering systems shall be equipped with a ticket printer. The ticket
> printer shall be used for all sales; a copy of the ticket issued by
> the device shall be left with the customer at the time of delivery or
> as otherwise specified by the customer.
>
> (Added 1992)

[^1]: Title amended 1986.