17 Notwithstanding sections 15 and 16, the Commission, at its discretion, may authorize lesser distances between a chlorine unloading rack or tank car and any building, storage tank or other structure located on the same site as the chlorine facilities and used exclusively by the company or person owning or operating the chlorine facilities.
18 The horizontal distance between the centre point of a chlorine unloading rack or of the tank car, when it is at the unloading position, and the nearest point of the line of any adjoining property which has been or may be built upon shall not be less than 50 feet.
19 The horizontal distance between the track side of a chlorine unloading rack and the gauge side of the nearest rail of the track serving the facility shall not be less than prescribed in Schedule I.
20 The horizontal distance between the centre point of the chlorine unloading rack or of the tank car, when it is at the unloading position, and a main roadway or street or the gauge side of the nearest rail of any track other than a track serving the facility shall not be less than prescribed in the following paragraphs:
(a) not less than 50 feet from a main track or from the curb line of a main roadway or street; and
(b) not less than 20 feet from a passing track or any track other than a main track or a track serving the facility.
PART IIIPiping and Transfer Equipment
21 (1) Except as provided in section 22, only steel pipe, fittings and valves shall be used. They shall not be less than 3/4 inch nominal diameter and shall comply with the standards prescribed in Tables I and II of Schedule II, or other standards recommended by The Chlorine Institute and approved by the Commission.
(2) All joints exceeding a nominal diameter of 1 1/4 inches shall be welded.
(3) Gaskets, joint compound and valve packing shall comply with the recommendations of The Chlorine Institute as contained in its Pamphlet No. 6, dated January 18, 1962, and amendments thereto.
(4) All welding operations shall be performed by a welder approved by the provincial government concerned for the type of welding to be done.
22 Notwithstanding section 21, the flexible connection between the unloading rack and the tank car shall comply with The Chlorine Institute Drawing No. 118, as shown in Schedule III, or other arrangement recommended by The Chlorine Institute and approved by the Commission.
23 A shut-off valve shall be installed in the discharge line near the discharge side of the flexible connection prescribed in section 22. It shall not be used for throttling purposes and shall either be fully open or fully closed. A second shut-off valve shall be installed in the discharge line near the process tank or other receiving vessel.
24 (1) Prior to being placed in service for the first time and prior to being returned to service after a repair, the piping system shall receive a hydrostatic and a pneumatic test as prescribed in subsections (2) and (3).
(2) The piping system shall be tested at a hydrostatic pressure of 300 psig. It shall be able to withstand this test for 30 minutes without leakage or a failure of any kind.
(3) After the hydrostatic test, the piping system shall be thoroughly dried and cleaned, then tested for leaks with dry air at 150 psig, as recommended by The Chlorine Institute in its Pamphlet No. 6, dated January 18, 1962, and amendments thereto.
(4) A dated and signed record of the latest hydrostatic and dry air tests shall be retained on the owner’s or operating company’s file for examination by an officer of the Commission when so requested.
25 An expansion chamber shall be provided between shut-off valves or other locations where liquid chlorine may become trapped. The capacity of the expansion chamber shall not be less than 20 per cent of the capacity of the pipeline it is intended to protect.
26 (1) If the normal tank car pressure is not adequate for unloading purposes, it may be increased by means of clean dry air by a procedure commonly known as “Air Padding” in accordance with the recommendations contained in The Chlorine Institute Pamphlet No. 4, dated May 17, 1961, and amendments thereto, and with the requirements prescribed in subsections (3) and (4).
(2) Clean, dry, inert gas may be used for “Padding” if the written consent of the chlorine supplier is obtained.
(3) The total pressure of air or inert gas padding plus chlorine vapour in the tank car at the maximum temperature attained during unloading shall not exceed the following:
(4) The air or inert gas used for padding shall be free from oil and other foreign substances and shall be dried to a dew point, measured at atmospheric pressure, of minus 40°F or below.
(2) Ground-based supports for pipelines more than four feet above ground shall be mounted on footings which extend below the frost line or which 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) Ground-based, steel supports for pipelines more than four feet above ground should be coated or otherwise protected against fire damage by a method recommended by the National Fire Protection Association to provide the support with a fire resistance rating of not less than two hours.
(2) Except as provided in section 29, pipelines located on the railway right-of-way within 20 feet of a track shall be installed in accordance with any one of the following paragraphs:
(a) pipelines may be enclosed in a reinforced concrete or steel trench fitted with a recessed removable cover flush with the ground; the trench shall be provided with a drain to prevent water from collecting;
(b) pipelines may be carried on an overhead pipe bridge fabricated from steel or concrete and providing a minimum clearance of not less than 13 feet above ground, except that the installation of pipelines over tracks shall not be undertaken without the express approval of the Commission in writing;
(c) that portion of a pipeline between the unloading rack and a process or similar building located on the unloading site may be enclosed by a chain link fence not less than five feet high.
(2) Notwithstanding subsection 28(2), pipelines under roadways on the railway right-of-way shall be enclosed in a vented encasing pipe. The top of which shall be below the frost line and in no case less than three feet below the surface of the roadway. It shall be capable of supporting all overhead traffic without deformation or a failure of any kind.
30 Unloading racks shall be constructed of concrete or steel and their footings shall extend below frost line or to solid bedrock.
31 Vaporizers shall be designed, constructed, operated and maintained in accordance with the recommendations of The Chlorine Institute as contained in its Pamphlet No. 9, dated November 7, 1962, and amendments thereto.
PART IVUnloading Operations
32 The company or person to whom the chlorine tank car is consigned for unloading shall comply with all of the requirements prescribed in this Part.
33 At least one unloading operator or other person trained in the handling of chlorine and familiar with its hazards, (see Schedule IV), shall be in attendance on the unloading site during the entire period that chlorine is being discharged from the tank car for the purpose of ensuring that the unloading operations are performed safely and in accordance with these Regulations.
34 During the entire period that the tank car is connected to the unloading pipelines it shall be protected on the connected end or ends of the unloading track by a locked derail or switch located at least one car length from the tank car.
35 (1) During the entire period that the tank car is connected to the unloading pipelines, it shall be protected on the connected end or ends of the unloading track by a weatherproof sign or signs, measuring 12 inches by 15 inches and reading “STOP — TANK CAR CONNECTED”. The word “STOP” shall be in letters at least four inches high and the other words in letters at least two inches high. The letters shall be white on a blue background.
(2) The “STOP — TANK CAR CONNECTED” sign or signs, shall be placed on the tank car, or the unloading track in a manner that will ensure its visibility to the crew of an engine approaching the tank car on the same track.
36 The tank car hand brakes shall be applied and the wheels shall be blocked at both ends of the car during the entire period that the tank car is connected to the unloading lines.
(2) Pipelines need not be disconnected from the tank car if all shut-off valves on the tank car and in the discharge lines are closed, the tank car is protected as provided in sections 34 to 36 and the period during which operations are suspended does not exceed 72 hours.
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