ORDINANCE NO. 8874 - Laserfiche WebLink

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416 (a) Every container other than those complying with interstate Commerce Commission Regu7.a,tions and every vaporizer other than those of less than one quart total capacity not heated by artificial means and those arranged so the liquid there- in can pass back to the originating container at all times without hindrance, shall be provided ~,aith approved safety relief valves which cannot be shut off by stop valves. Relief valve discharge shall start at a pressure not more than 125 per cent of the designed ~rrorking pressure,. Safety relief valves shall have a free discharge area not less than as s~oecified in the Standards of the National Board of Fire Underwriters for the Design, Installation and Construction of Containers end Pertinent Equipment for the Storage and. Handling of Liquefied Petroleum Gases. (b) The discharge from safety reliefs shall be outside of buildings and not less.than 5 feet a~~ray from any opening in any building which is below the ~.evel of such discharge. 812 V,4PORIZiATG AND HOUSING \ (a) In donestic installations no liquid or gas shall be led into the building at a pressure exceeding 20 pounds gauge. The initial pressure reducing device shall be installed outside of building, except in the case of. a vaporizer house. (b) The vaporizer shall be located outside of buildings except those buildings devoted exclusively to gas manufactuxang and distribution operations, but may be located in a house or shed of fireproof construction, ~,vell ventilated from points near the floor and roof; provided that on systems utilizing vaporization supplied t~aithout artificial means, vaporizers may be installed in buildings, if such vaporizers are of not more than one quart capacity and are located close to point at arhich .pipe to vaporizer enters building. (c) 'Where a. device is employed for premixing the gas with air, such device shall be provided ~,rith means for automatically shutting off the gas mixing device before a combustible mixture is generated, except ~.~~here combustible mixtures are desired and generated, in ltihich case flame arresters shall be installed. ELEC2'RICAL INSTALLATIONS AND OPEN FLAMES. (a) In the immediate vicinity of storage containers, in vaporizer or pump houses, in cylinder filling plants, in gas plants, and similar 1oc~tions ~r~here liquefied gases are in liquid .form in large quantities, all electrical installations shall be in strict accordance ~.rith 'the requirements of. the National Electrical Code for Class 1 hazardous locations. (b) No artificial light involving flames or sioa.rks, shall be used in the vicinity of container ch~.rging operations Approved explosion-proof flashlights may be employed. 81~ FILLING DENSITIES. 'The total amount of liquefied gas, by weitht, shall be limited to the following percentages of the freight of the water capacity of the container, depending upon the specific gravity at 60 degrees Farenheit of ,the liquid; F'or ).BOO specific gravity, 32 per cent for aboveground and 35 per cent for under- ground; for 0.500 specific gravity, ~?1 per cent for above ground and ~+5 per cent for underground; for 0.6A0 specific gravity, 53 per cent for aboveground and 56 per cent for underground; and for intermediate or higher specific gravities, corres- ponding percentages, but in no case shall the amount of liquid be such as to fill the conta.irer at a temperature of 1j0 degrees Farhenheit for aboveground, and 105 degrees Fahrenheit for underground. Sly TRANSFFFt OF LIQUID. A17. transfer of liquid or gases shall be by approved piping; or hose, tested to 5 times the d.esigna,ted wor king pressure. All connections shall be free from leaks. 816 TANK TRUCKS AND TRAILERS. Tank trucks and trailers shall be constructed a.s des- cribed in Section 80~. Piping safety devices, ,filling and the loading and unloading of tank trucks and trailers shall be as specified for containers Pumps of suitable design and properly protected may be mounted upon trucks and trailers and may be driven by the truck motor power take-off or other s~i.table means. The pumps. except constant speed centrifugal pumps, shall be equipped ~rrith suitable pressure actuated by-pass valves permitting flow from pump diseharge•to pump suction when the pump discharge pressure rises above a:predetermined point. . Every tank truck and. trailer shall be provided ~sith properly attached steel bumpers, or chassis extension at the rear which shall be so arranged as to adequately protect the tank, piping, valves and f.ittinga in o~.se~of collision. Part~9.~ FLAMhgABLE LI~,UIDS 0