Imperial Valley press., 1939-11-03
LEGAL ADVERTISEMENT

the latter case, installation shall
be made in such manner that any
undue strain beyond the excess
flow valve will cause breakage on
the discharge end of the excess
flow and not between the container
and such valve. Gauging devices
which do not involve the flow OF
liquid or which are so constructed
that outward flow of container con-
tents shall not exceed that passed
by a No. 54 drill size need not be
equipped with excess flow valves.
All connections to containers, ex-
cept gauge connections and safety
relief connections, shall be provided
with shut-off valves close to the
container.
SECTION XII: Every storage
and supply container, and every
vaporizer shall be provided witt.
sufficient relief area which cannot
be shut off by stop valves. Dis
charge shall be at pressure not
more than 1875 per cent of the de-
signed working pressure. The area
of the relief and the size and length
of the discharge piping, which shall
extend to the outside air, shall be
such that a pressure in excess of
$50 per cent of the designed work.
ing pressure will not be developed.
Relief areas shall be as calculated
by Fetterly's formula for uninsulat-
ed pressure vessels and an expos
ure temperature of 1000 degrees
Fahrenheit as promulgated by the
Bureau of Explosives of the Ameri-
can Railway Association. Under
ground storage containers need
have only 80 per cent of the speci-
fled relief area.
Section XIII: vaporizing and
Housing.
(a) In domestic installations no
liquid or gas shall be led into the
building at pressure exceeding
20 pounds gauge. The initial pres
sure reducing device shall be in
stalled outside of building, except
in the case of a vaporizer house.
(b) The vaporizer shall be locat-
ed outside of buildings except those
buildings devoted exclusively to gas
manufacturing and distribution op-
erationS; but may be located in a
house or shed, of fireproof con-
struction, we'll ventilated from
points near the floor and roof. Ex-
cept that on systems of small vol
ume utilizing vaporization supplied
without artificial means, they may
be installed in Easements of build
ings, provided such vaporizers are
located close to point at which pipt
to vaporizer enters building.
(c) Where device is employed
for premixing the gas with air
such device shall be provided with
means for automatically shutting
off the gas mixing device before 9
combustible mixture is generated
except where the combustible mix
lures are desired and generated
in which case flame arresuers shall
be installed.
SECTION XIV: Approved gaug.
ing devices shall be employed on al
storage containers other than cyl
inders and drums. The charging o.
customers containers or the chang.
ing or charging of cylinders o.
drums should preferably be by day
light only. No artificial light, in.
volving flames or sparks, shall b.
used in the vicinity of the charging
operation. Approved explosion-proo
flashlights may be employed.
SECTION XIV: In the immediat,
vicinity of storage containers, il
vaporizers or pump houses, in cyl
inder filling plants, in gas plants
and similar locations where lique
fled gases are in liquid form il
large quantities, all electrical in
StallationS shall be in strict accord
ance with the requirements of tn,
National Electrical Code for Clas
1 hazardous locations.
SECTION XVI: The total amour
of liquefied gas, by weight, shal
be limited to the following per
centages of the weight of the waite
capacity of the container, depend
ing upon the specific gravity at 6
degrees Fahrenheit of the liquid
For 0.40O specific gravity, 80 pc
cent for aboveground and 35 pc
cent for underground; for 0.500 spe
cific gravity, Al per cent for abov
ground and A per cent for under
ground; for 0600 specific gravity
53 per cent for aboveground and s.
per cent for underground; and TO
intermediate or higher specifi
gravities, corresponding percent
ages; but in no case shall tn
amount of liquid be such as to fiji
the container at a temperature O
1870 degrees Fahrenheit for above
ground, and los degrees F'ahrenhei
for underground.
SECTION XVII: Transfer o
Liquid. All transfer of liquid O.
gases shall be by piping or hose
tested to times the designed work
ing pressure. All connections shall
be free from leaks.
SEXTON XVIII: Cylinders O
Drums.
(a) Cylinders or drums are no
acceptable for distribution in inter.
state commerce and marked TO tn,
effect that they comply with tn,
Interstate Commerce Commission
specifications and regulations shal
not be used.
! (b) When cylinders or drum!
| are not in lise outlet valvac cha I