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Printable Version Standards Respecting Pipeline Crossings Under Railways is available in PDF format (file size 162kb) which will download in approximately 46 seconds on a 28.8 connection and may be viewed using Acrobat Reader (version 3.0 or higher). Note: Portable Document Format (PDF) formats may be viewed using version 3.0 or higher of the Adobe® Acrobat Reader. This reader may be downloaded free of charge by visiting the Adobe® web site. Contents
Appendix A: Plans and Design Requirements for Pipelines Crossing under Railways 1. Scope1.1 These standards may be known as the "Pipeline Crossing Standards". 1.2 These standards are intended to ensure that pipeline crossings under Railways are installed, renewed and maintained in a safe manner. These standards apply to Railway Companies subject to the jurisdiction of the Minister of Transport pursuant to the Railway Safety Act. 2. General Applications and Exclusions2.1 Pipeline Installation Procedures shall be in strict conformance with all Federal, Provincial and local safety regulations. 2.2 These standards do not include overhead cable crossings, overhead pipeline crossings, and underground cable crossings. 2.3 These standards do not apply to any pipe installed under a railway right-of-way prior to the date of approval of these standards, unless the pipeline crossing is to be reconstructed. 3. General Conditions3.1 No person shall commence the installation of any pipe under a railway without:
3.2 No person shall commence the repair, maintenance or removal of any pipe under a railway without obtaining a written approval from the railway company that owns, operates or has control of the railway. 3.3 Every owner of a pipe installed under a railway, shall at all times maintain the pipe in good working order and condition, so that:
4. Requirements for Pipelines Crossing under Railways - GeneralFor oil and gas pipelines crossing under railways, the requirements of C.S.A. Standard Z662-99, and subsequent revisions, will apply as modified and amended in Section 5 herein. For steam, water, sewer or other non-flammable substance pipelines crossing under railways, the requirements of Section 6 shall apply. The term "Engineer" used herein means the Chief Engineer of the railway company or his authorized representative. General: Railway design loading applicable to all pipelines crossing under railways shall be Cooper's E80 track loading, with diesel impact as specified in C.S.A. Standard Z662-99. The use of optional limits states design processes under C.S.A. Standard Z662-99 will not apply to the design of oil and gas pipelines crossing under railways. 5. Requirements for Oil and Gas Pipelines under Railways5.1 Amend C.S.A. Standard Z662-99 Clause 4.7 Cover and Clearance Requirements as follows: Table 4.8 "Minimum Cover and Clearance Requirements": In the case of oil and gas, and hazardous* gas pipelines crossing under railways, Table 4.8 shall be amended as follows: Table 4.8: Minimum Cover and Clearance Requirements
* Non-flammable gas or liquid products which, from their nature or pressure, might cause damage or endanger the lives, well-being and health of people, or the environment, if escaping on or in the vicinity of railway property. ** Within 7 metres of centre of outside rail, measured at right angles to the centre-line of the track. *** On portions of the right-of-way where carrier or casing pipe is not directly beneath any track. 5.2 Amend C.S.A. Standard Z662-99 Clause 4.7.1 as follows; Add to end of Clause 4.7.1:
5.3 Amend C.S.A. Standard Z662-99 as follows;
Add to Clause 10.2.2:
Add to Clause 10.2.8.4:
Add as a new Clause 4.4.11 called "Emergency Shutoff Valves" the following:
Add as a new Clause 4.7.4 called "Longitudinal installations" the following:
5.4 Amend C.S.A. Standard Z662-99 Table 4.9 "Least Nominal Wall Thickness for Steel Casing Pipe in Cased Crossings and Carrier Pipe in Uncased Crossings" as follows; All least nominal wall thicknesses for steel casing pipe in cased crossings and steel carrier pipe in uncased crossings shall be as shown in Table 4.9, except that the least nominal wall thickness shall not be less than 4.8 mm in any case. Add new Notes under Table 4.9, as follows: Notes:
5.5 Amend C.S.A. Standard Z662-99 Clause 4.8.3 "Crossings of Roads and Railways" as follows; Add new item to Clause 4.8.3.3 Cased Crossings: (h) Casing pipe and joints under railways shall be of leakproof construction capable of withstanding railway loadings specified herein, and shall be of steel unless otherwise indicated herein, or as approved by the Engineer. 5.6 Replace C.S.A Standard Z662-99 Clause 12.4.6 with the following: Polyethylene carrier pipe may be used in pipeline systems for the transportation of gaseous hydrocarbons under railways if:
5.7 Replace C.S.A. Standard Z662-99 Clause 15.4.5 with the following: Aluminum pipe is not acceptable for use in pipeline crossings under railways. 6. Requirements for Steam, Water, Sewer and Other Non-Flammable Substance Pipelines under Railways6.1 Carrier and Casing Pipe RequirementsPipelines carrying steam, water (other than oilfield steam and water), sewer, and other non-flammable or non-hazardous substances under railways shall be encased in a larger pipe or conduit called the casing pipe. Casing pipe may be omitted under the following conditions:
Carrier pipe, casing pipe, and joints shall conform to the applicable requirements of AREMA Ch. 1 Section 5.3 with respective materials in conformance with C.S.A. Standards, and be:
Joints for carrier line pipe shall be leakproof mechanical or welded type. For steel carrier or casing pipe the least nominal wall thickness shall be in accordance with C.S.A. Standard Z662-99 as amended in Section 5 of this Pipeline Crossing Standard. For pressures under 700 kPa in the carrier pipe, the casing pipe, if required, may be reinforced concrete pipe conforming to specifications in AREMA Manual for Railway Engineering Chapter 8 "Concrete Structures and Foundations", Part 10 "Reinforced Concrete Culvert Pipe", or coated corrugated metal pipe conforming to AREMA Manual Chapter 1, Part 4, all as approved by the Engineer. Respective materials shall conform to applicable C.S.A. standards. 6.2 Minimum Cover and Clearance Requirementsa) Minimum cover for buried pipelines, cm (measured to top of carrier or casing pipe, as applicable)
* Non-flammable gas or liquid products which, from their nature or pressure, might cause damage or endanger the lives, well-being and health of people, or the environment, if escaping on or in the vicinity of railway property. ** Within 7 metres of centre of outside rail, measured at right angles to the centre-line of the track. *** On portions of the right-of-way where carrier or casing pipe is not directly beneath any track. 6.3 General Installation RequirementsFor water and sewer crossings under railways, the highest point of carrier pipe shall be below the frost line. In regions of permafrost or where other obstacles make it impossible to place the pipe below the frost line, the applicant will propose alternate methods to protect the pipe in sub-freezing temperatures and shall obtain approval of the Engineer to use such methods. Pipelines carrying steam, water (including oilfield steam and water), sewer and other non-flammable or non-hazardous substances under railways, shall not be placed within culverts nor under railway bridges where there is likelihood of restricting the area required for the purposes for which the culverts or bridges were built, or of endangering the foundations. Any such pipelines laid longitudinally on railway rights-of-way shall be located as far as practicable from any tracks or other important structures. If located within 7.62 metres of the centre-line of any track, or where there is significant risk of damage from leakage to any bridge, building or other important structure, the carrier pipe shall be encased or of special design as approved by the Engineer. Every open drain crossing tracks in a railway yard shall be safely covered for at least 3.0m from the centre-line of track, except in times of flood when uncovered open drains may be provided as may be necessary. In this case warning signs shall be erected. C.S.A. Standards current at time of constructing the pipeline, shall govern the inspection and testing of the facility within the railway rights-of-way. The proof testing of the strength of carrier pipe shall be in accordance with C.S.A requirements. Appendix A For all pipeline crossings under railways (including oil and gas, steam, water, sewer, storm drain, etc.), plans for proposed installation shall be submitted to and meet the approval of the Engineer before construction is begun. Plans shall be drawn to scale showing the relation of the proposed pipeline to railway tracks, angle of crossing, location of nearest shut-off valves, railway mileage, right-of-way lines and general layout of tracks and railway structures and facilities. Plans should also show a cross-section (or sections) from field survey, showing pipe in relation to actual profile of ground and tracks, with location of any joints in the carrier or casing pipe within the railway right-of-way, and necessary geo-technical boreholes (soil type) and ground water levels. Pipelines shall be installed under tracks by boring and/or jacking, if practicable. If open-cutting or tunneling is approved, the proposed limits of excavation, details of sheeting and method of supporting tracks or driving tunnel shall be shown, with supporting engineering calculations. In addition to the above, plans should contain the following data:
Vents:
Seals:
Other Information:
Plans shall be sealed and signed by a professional engineer, competent in this field, registered in the province or territory in which the pipeline crossing is located. The execution of work on railway rights-of-way, including the supporting of tracks, shall be subject to the inspection and direction of the Engineer. Where laws or orders of public authority prescribe a higher degree of protection than specified herein, then the higher degree of protection so prescribed shall be deemed a part of this Standard.
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