25. (1) All tanks shall be inspected and tested prior to operation at the pressure specified by the A.S.M.E. Code by a qualified unfired pressure vessel inspector in accordance with the applicable regulations of the province concerned.
(2) A copy of the tank test and inspection report shall be filed with the Commission.
26. The storage tank shall be permanently marked or labelled as required by the A.S.M.E. Code under which the tank was manufactured and the Pressure Vessel Inspection Branch of the provincial government concerned.
27. (1) Storage tanks shall not be installed inside buildings or in a location that would restrict the natural dispersal of fumes.
(2) Storage tanks shall not be installed one above the other.
28. Each storage tank exceeding 1,000 Imperial gallons water capacity shall be electrically grounded for protection against static electricity and lightning, as prescribed in National Fire Protection Association Pamphlet No. 77. The resistance to electrical discharge to ground should be as low as possible and preferably not more than 6 ohms.
29. The filing density for storage tanks of liquefied petroleum gas shall not exceed the maximum filing density prescribed in the current edition of Pamphlet No. 58 of the National Fire Protection Association.
30. (1) Unless filing is controlled by weighing, tanks shall be equipped with a fixed tube liquid level, a rotary tube, or an adjustable slip tube gauge, or other gauging device that will ensure that the maximum permitted filing density is not exceeded. If the gauging device is a float type or a pressure differential type, the container shall also be provided with a fixed dip tube, rotary tube or adjustable slip tube gauge.
(2) Gauge glasses of the columnar type shall be restricted to charging plants where the fuel is withdrawn in the liquid phase only. They shall be equipped with valves having metallic hand wheels; with excess flow valves and with extra heavy glass protected with a metal housing applied by the manufacturer. These gauges shall be shielded against the direct rays of the sun.
31. Each tank with a water capacity exceeding 2,000 Imperial gallons shall be equipped with a suitable pressure gauge graduated from 0 to 400 psi.
32. The below ground installation of liquefied petroleum gas tanks is not recommended.
PIPING AND TRANSFER EQUIPMENT
33. Pumps and compressors used for transferring liquefied petroleum gas shall be of a type suitable for liquefied petroleum gas service, shall be designed for the maximum working pressure to which they will be subjected, and shall be so recommended and permanently marked or labelled by the manufacturer.
34. (1) Pipelines of 1/2 inch nominal diameter or under shall be wrought iron, steel, brass or copper pipe, or seamless copper, brass, steel or aluminium tubing. Copper tubing may be of the standard grade K or L or equivalent and shall have a minimum wall thickness of 0.032 inch. Aluminium tubing shall not be used in exterior locations or where it will come in contact with masonry or plaster walls or insulations.
(2) All piping and fittings over 1/2 inch nominal diameter shall be made of steel.
(3) Pipe joints may be screwed, flanged, welded, soldered or brazed with a material having a melting point exceeding 1,000°F. Joints on seamless copper, brass, steel or nonferrous gas tubing shall be made by means of approved gas tubing fittings, soldered or brazed with a material having a melting point exceeding 1,000°F. Welded joints or welding flanges are recommended for container connections exceeding 2 inches in diameter.
(4) Welding may only be done by a qualified welder recognized as such by the Boiler and Pressure Vessel Inspection Branch of the provincial government concerned.
(5) For working pressures of 125 psig or less, pipe and pipe fittings and tubing shall be designed for a pressure of at least 125 psig, and for working pressures above 125 psig, they shall be designed for the maximum pressure to which they may be subjected or 250 psig, whichever is the greater.
(6) For pressures of 250 psig or greater, extra heavy pipe and fittings shall be used for threaded piping. Tubing shall be of heavy walled seamless construction.
(7) The bursting strength of any pipe or tubing and fittings shall be not less than four times the design pressure of the tank to which they are connected and not less than four times that pressure to which in any instance they may be subjected in service by the action of a pump or other device.
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