PART IIIStorage Tanks
20 (1) Vertical above ground storage tanks shall be installed on non-combustible foundations of strength adequate to permanently support the tank in a true vertical position. The bottom of the tank shall be suitably protected against corrosion.
(2) Horizontal above ground storage tanks shall be installed on non-combustible foundations of strength adequate to permanently support the tank in a true horizontal position.
(3) Steel foundations exceeding 18 inches in height at the lowest point for above ground storage tanks with a capacity in excess of 3,000 Imperial gallons shall be made fireproof with a material that has a fire resistance rating of not less than two hours.
(4) Below ground storage tanks shall be set on a firm foundation surrounded with soft earth or sand well tamped in place. Ashes or any other corrosive material shall not be used to cover storage tanks.
(5) Except as provided in subsection (6) and in subsection (7), underground storage tanks shall be covered with a minimum of two feet of earth or with not less than one foot of earth, on top of which shall be placed a slab of reinforced concrete not less than four inches in thickness.
(6) If below ground storage tanks may be subjected to vehicular traffic, they shall be protected against damage with at least three feet of earth cover or 18 inches of well tamped earth plus either six inches of reinforced concrete or eight inches of asphaltic concrete that shall extend at least 12 inches horizontally beyond the storage tank extremities in all directions.
(7) Notwithstanding subsection (5), below ground storage tanks that are not entirely buried shall be covered with earth to a minimum depth of two feet with a slope on all sides not less than 1 1/2 feet horizontally to one foot vertically.
21 (1) Storage tanks shall be designed, constructed, tested and inspected in accordance with the Standards of the National Fire Protection Association, (Pamphlet 30, May 1962 issue and amendments thereto) and the appropriate API or A.S.M.E. code unless the requirements of the provincial government having jurisdiction in the surrounding area are of a higher standard than those of the N.F.P.A., in which case, the more stringent requirements shall apply.
(2) A copy of both the storage tank test and the inspection report or other evidence of compliance with the applicable code shall be kept on file by the owning or operating company for examination when requested by the Commission.
(3) Welding to any part of a storage tank shall be in accordance with the code under which the storage tank was fabricated. Welding shall not be permitted until the tank has been completely emptied and thoroughly purged.
(4) The storage of flammable liquids in open top storage tanks is prohibited.
22 Each storage tank shall be permanently stamped or labelled as required by the code under which the storage tank was manufactured, and in accordance with the regulations of the provincial government concerned.
23 If the ground resistance of a storage tank exceeding 3,000 Imperial gallons is greater than 15 ohms, ground rods or other grounding devices shall be used.
(2) Except as provided in subsection (3), all vents on storage tanks containing Class I flammable liquids shall be equipped with corrosion resistant flame arrestors or breather valves or venting devices that normally remain closed.
(3) Notwithstanding subsection (2), open vents may be installed on a storage tank containing a Class I flammable liquid if the capacity does not exceed 3,000 Imperial gallons.
(4) All above ground storage tanks shall be provided with a means of emergency pressure relief. In a vertical storage tank, this may take the form of a weak seam or joint on the top of the tank or between the head and the shell of the storage tank. The total venting capacity of both normal and emergency vents shall be sufficient to prevent violent rupture of the storage tank when exposed to fire.
(5) Gauge hatch covers shall be fitted with a spark resistant material.
(6) The lower end of the vent pipe on all storage tanks shall not extend more than one inch through the top of the storage tank and shall be installed so that the pipe will drain into the storage tank without traps or bends in which liquid can collect.
(7) The discharge point of all storage tank vent pipes shall be located outside buildings so that flammable vapours will not enter building openings, or be trapped under eaves or other obstructions, or be exposed to a source of ignition.
(8) For Class I flammable liquids, the point of discharge of a vent pipe on a below ground storage tank shall be higher than the fill pipe opening, shall discharge upwards, and shall be at least 12 feet above adjacent ground level.
(9) The discharge point of vent pipes on Class II below ground flammable liquid storage tanks shall be located above the highest recorded snow level. The vent pipes may be fitted with return bends, coarse screens or other devices to minimize the ingress of foreign material.
25 Storage tanks equipped with heating coils, jackets or other heating devices shall be equipped with thermometers and suitable temperature regulators to ensure that the temperature of the contents is maintained within safe limits.
26 All pipe connections to below ground storage tanks shall be made through the top of the storage tank above the liquid level, and shall be graded toward the storage tank. Storage tank shells shall be properly reinforced where pipe connections enter the tank.
(2) It is recommended that the final coat of paint on an above ground storage tank be a white enamel, a self cleansing white paint, or other heat reflective material.
28 Below ground storage tanks shall be securely anchored or weighted when floating or moving of the tank due to changes in ground water level is likely to be encountered.
29 A storage tank shall not be subjected to a pressure in excess of its maximum working pressure. Removal of the tank contents by the use of air pressure is prohibited. A pressure not exceeding five pounds per square inch may be used to detect leaks.
PART IVPiping and Transfer Equipment
30 Flammable liquid pumps shall be of a type suitable for the liquid being transferred and shall be designed to the maximum working pressure to which they will be subjected in service.
31 (1) Piping systems for flammable liquids shall be designed for the maximum working pressure to which they will be subjected in service, and shall be fabricated of a material compatible with the flammable liquid being handled.
(2) Shut-off valves and pipe fittings installed on storage tanks, and the main shut-off valves and pipe fittings installed on loading or unloading racks or terminals shall be fabricated of steel.
(3) Welded joints or welding flanges are recommended for storage tank connections exceeding a nominal diameter of two inches.
(4) Welding shall only be done by a qualified welder and in accordance with the provisions of Canadian Standards Association Pamphlet W-117-1952 and amendments thereto.
(5) All piping, valves and fittings shall be tested after installation and before operations begin at a pressure 50 per cent in excess of the maximum working pressure, but in no case less than 5 psig and that pressure shall be maintained for a period of not less than 30 minutes.
(6) Pipe wall thickness shall be in accordance with the American Standards Association Code for Pressure Piping and amendments thereto.
(7) All piping and fittings both above or below ground, if subject to external corrosion, shall be suitably protected by paint or other corrosion resistant coating.
(8) On installations where more than one class or type of flammable liquid is handled, all exposed piping or valves shall be identified by coloured markings or by durable tags to indicate the type of flammable liquids being carried.
32 (1) Flammable liquid piping systems shall contain a sufficient number of valves, properly installed, to protect the storage plant in the event of an emergency and to control the flow of liquid in normal operation.
(2) Pipelines used for loading or unloading tank cars shall be equipped with shut-off valves both at the loading or unloading connections and at the storage tanks.
(3) Pipelines used for transferring flammable liquids from tank cars or tank trucks into above ground storage tanks shall be equipped with suitable check valves or fittings to prevent accidental back flow of the flammable liquid from the storage tanks.
(4) Shut-off valves located below liquid level on above ground storage tanks shall be located as close as possible to the storage tank shell.
33 All gauges and accessory equipment shall be of a material that is compatible that the flammable liquid being handled under the service conditions to which they may be subjected.
34 All materials such as joint compounds, gaskets, valve seats and packing shall be compatible with the flammable liquids being handled under the service conditions to which they may be subjected.
(2) Supports for pipelines more than four feet above ground shall be supported on footings that extend below the frost line or rest on bedrock.
(3) Pipelines exposed to damage by vehicular traffic shall be protected by guard rails or curbs of concrete or metal.
(4) Provision shall be made in pipelines for expansion, contraction, jarring, vibration and settling.
(5) Steel supports for pipelines carrying Class I flammable liquids and more than four feet above ground should be made fireproof with a material that has a fire resistance rating of not less than two hours.
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