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Table of ContentsPart I: General
Part II: Filing Requirements
Appedix I
PART I - GENERAL1. SHORT TITLE 1.1 For ease of reference, this rule may be referred to as the "Air Reservoir Rule". 2. SCOPE 2.1 These rules prescribe the standards for installation, inspection, testing and reporting of air reservoirs used by railway companies subject to the jurisdiction of Transport Canada. These rules apply to stationary and portable reservoirs except those on locomotives. 3. DEFINITIONS In these rules. 3.1 "air reservoir" means a tank of air larger than 5 cubic feet and under pressure greater than 15 pounds per square inch; 3.2 "automatic drain valve" means a device which automatically drains condensate from the air reservoir supply system; 3.3 "department" means the Department of Transport, Surface Group; 3.4 "design pressure" means the maximum permissible internal operating pressure for a vessel in its normal operating position at the operating temperature specified for that pressure, and includes a factor of safety of 4*; 3.5 "factor of safety" means a margin of safety and is used to determine maximum allowable stress value used for the design of the reservoir; 3.6 "authorized working pressure" means the pressure at which a vessel is authorized to operate; it must always be less than the design pressure; 3.7 "hydrostatic testing" means a test capable of pressurizing the reservoir to a minimum test pressure of 1 1/4 times the maximum authorized working pressure (as prescribed on the badge plate); 3.8 "railway company" means a railway or railway company subject to the Railway Safety Act; * factor corrected to read 4 instead of 5 as per approval letter dated March 11, 1998 3.9 "railway safety inspector" means a Department of Transport inspector appointed pursuant to section 27 of the Railway Safety Act; 3.10 "telltale drilled" means a reservoir drilled to a pre-determined depth over its entire surface, both shell and heads, using a standard 3/16" drill. 4. GENERAL 4.1 A railway company is responsible to ensure that all air reservoirs, associated piping, pressure gauges and safety valves attached thereto, are safely maintained. 4.2 A railway company shall prepare and distribute suitable air reservoir maintenance guidelines to railway staff which upon request shall be made available to a railway safety inspector. These guidelines will include authorized working pressure. 4.3 Any reservoir developing leakage through a telltale hole or corrosion of the reservoir steel plate, shall be permanently removed from service. 4.4 Any newly installed reservoir shall be telltale drilled using the procedures in section 8.2. 5. RESERVOIR INSTALLATION REQUIREMENTS 5.1 Identification
5.2 Pressure Gauges
5.3 Safety Valves
5.4 Drain Valve
5.5 Setting
6. INSPECTION AND HYDROSTATIC TESTING 6.1 Reservoirs will be inspected to verify condition of reservoir system, air gauges and safety valves. Air gauges and safety valves shall be inspected annually. Defective components will be replaced. 6.2 Inspections and hydrostatic testing will be performed:
7. HYDROSTATIC TESTING PROCEDURES 7.1 Reservoirs requiring hydrostatic testing shall be tested to a pressure at least 25 per cent greater than the working pressure authorized under 5.1. The date of the hydrostatic test shall be stenciled in not less than one inch figures at a prominent location on each reservoir. 7.2 The entire surface of an undrilled reservoir shall be hammer-tested before each hydrostatic test with reservoir under atmospheric pressure. 7.3 All undrilled air reservoirs shall be thoroughly cleaned by washing out at each hydrostatic test, so as to remove all foreign matter, and then closely examined for corrosion and pitting. 8. TELLTALE DRILLING 8.1 General Existing welded reservoirs may be telltale drilled using the procedures in section 8.2. Newly installed reservoirs, except those constructed of corrosion resistant steel, must be telltale drilled. 8.2 Procedures a) Each air reservoir, originally constructed and maintained to withstand at least four* times the authorized working pressure, may be drilled over its entire surface both shell and heads with telltale holes, made by a standard 3/16" drill which shall be spaced not more than 12 inches apart, measured both longitudinally and circumferentially, and drilled from the outer surface to a minimum depth determined by the formula: D = 0.6 PR/(S - 0.6 P) where:
b) the design pressure P is obtained from: P = SEt / (R + 0.6t) where:
c) on horizontal reservoirs, one row of holes shall be drilled lengthwise in a line at the bottom of the reservoir; d) on vertical reservoirs one row of holes shall be drilled on a line passing through the lowest point of the reservoir; e) the holes drilled in each head shall be radially in line with the longitudinal rows of the holes in the shell; and f) flange connections, longitudinal seams or other permanent connections to the air reservoir that interfere with telltale hole lines or circles must be cleared by a least one inch. PART II - FILING REQUIREMENTS9. FILING REQUIREMENTS WITH THE DEPARTMENT 9.1 Stationary Air Reservoirs
9.2 Portable Air Reservoirs
APPENDIX ISPECIFICATION AND INSPECTION REPORT FOR AIR RESERVOIRS AND ASSOCIATED COMPONENTS
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Located at or on ____________________ Railway Serial No. _________ |
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