Safety Rules: Liquefied Petroleum Gas Division Page: G7
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threaded collar to the discharge vent line by means of threaded fittings or manufactured hose fittings
designed specifically for this purpose. The relief valve discharge vent line and the flexible high pressure
LP-gas hose shall withstand the pressure from the relief discharge when the relief valve is in the fullopen
position.
9.188. Use of Extra Liquid Outlet on Motor Fuel Containers.
A.S.M.E. motor fuel containers fitted by the manufacturer with extra liquid outlets may be used for
filling other motor fuel containers, provided the container and its appurtenances are installed and
protected as follows:
(1) Motor fuel containers used in this service shall be installed and limited to trucks of up to one ton
capacity with open cargo space.
(2) The cargo space shall not be enclosed at anytime in a manner that would prevent a complete
exposure of the container.
(3) The container's extra liquid outlet shall be fitted with an approved manual shut-off valve and an
internal excess flow valve (or an approved manual shut-off valve incorporating an internal excess
flow valve) designed to close automatically at the rated flow of vapor or liquid specified by the
manufacturer.
(4) The manual shut-off valve shall incorporate a hydrostatic relief valve set at 400 to 500 p.s.i.g.
(5) Rigid piping is prohibited.
(6) The extra liquid opening in the container shall be located in the upper shell of the container.
Any appurtenances attached to this opening shall be adequately protected against mechanical injury
or dislocation. This may be accomplished by adding to the existing fitting guard or by constructing a
new fitting guard with a minimum thickness of seven gauge steel. (Note: Welding shall not be
permitted on the container or pressure parts except by a licensed fabricator.)
(7) The liquid hose must be of an approved type as set out in 9.54 of this title (relating to Hose
Specifications) and shall not exceed 20 feet in length and 3/4 inch in diameter.
(8) All transfer of product must be done by pressure differential only.
(9) The hose end must be equipped with an approved shut-off valve. When not in use, the hose end
and shut-off valve shall be kept locked in a ventilated metal box to prevent tampering by
unauthorized persons. The metal box shall be attached to the vehicle to prevent accidental
displacement. Bottle filling from motor or mobile fuel containers is prohibited.
9.189. Auxiliary Engines-General Provisions for Vehicle Mounting.
(a) This section includes provisions for the installation of equipment and mobile fuel containers on
vehicles to supply LP-gas as a fuel to auxiliary engines and for other uses on these vehicles.(b) Mobile fuel containers shall not exceed 500 gallons individual water capacity, 1,000 gallons
aggregate capacity. All mobile fuel containers having 130 gallons water capacity or more shall be baffled
and shall have steel pads continuously welded to the container and shall be supported through an arc of
120 in such a manner as to prevent the concentration of excessive stresses in the shell plate of the
container.
(c) Mobile fuel containers in excess of 250 gallons water capacity to be installed on truck beds to supply
fuel to auxiliary engines or equipment (other than to propel vehicles) shall require the submission of plans
and specifications to the Railroad Commission for prior approval. Plans and specifications shall be
complete in all detail to indicate purpose and location of container mounting, as well as the complete
layout of piping system, noting piping, valves, fitting material, brand name, and model number.
(d) Gas vaporizers, regulators, and carburetion equipment to provide LP-gas as a fuel for auxiliary
engines shall be installed in accordance with Division V of the LP-Gas Safety Rules.
(e) The source of air for combustion shall be completely isolated from the driver and passenger
compartments, ventilation system, or the air condition system.G-7
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Railroad Commission of Texas. Liquefied Petroleum Gas Division. Safety Rules: Liquefied Petroleum Gas Division, book, November 1990; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth1544630/m1/75/?q=%22%5B1990..%5D%22: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.