CSA - B51 S1-05
Supplement No. 1 to B51-03, Boiler, Pressure Vessel, and Pressure Piping Code
|Publication Date:||1 November 2005|
This is the sixteenth edition of CSA B51, Boiler, Pressure Vessel, and Pressure Piping Code. It supersedes the previous editions published in 1997, 1995, 1991, 1986, 1981, 1975, 1972, 1969, 1965, 1960, 1957, 1955, 1951, 1945 and 1939.
In keeping with CSA's goal of harmonizing its standards with those of other countries to the greatest extent possible, CSA's Technical Committee on Boilers and Pressure Vessels and its subcommittees have, in the course of developing this Standard, worked closely with the National Board of Boiler and Pressure Vessel Inspectors in the USA and with the American Society of Mechanical Engineers (ASME) committees responsible for producing ASME's Boiler and Pressure Vessel Code.
There are three parts to this Standard.
Part 1 contains requirements for boilers, pressure vessels, pressure piping, and fittings. It is intended mainly to fulfill two objective: first, to promote safe design, construction, installation, operation, inspection, testing, and repair practices, and second, to facilitate adoption of uniform requirements by Canadian jurisdictions.
Part 2 contains requirements for high-pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles. It has been harmonized with International Organization for Standardization (ISO) Standard 11439:2000, Gas cylinders - High pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles. In addition, the CSA subcommittee responsible for developing Part 2 has consulted with the American National Standards Institute (ANSI) committee responsible for developing ANSI Standard NGV2-2000, Basic Requirements for Compressed Natural Gas Vehicle (NGV) Fuel Containers. The members of these two committees are dedicated to harmonizing their Standards as far as circumstances allow.
Part 3 contains requirements for compressed natural gas refuelling station pressure piping systems and ground storage vessels. These requirements have been allotted a separate part of the Standard to emphasize the differences between them and the requirements in Part 1, and thereby to facilitate their application. To ensure that the design of new cylinders and refuelling stations are compatible, the filling limits specified in Clause 4.2 of Part 2 provide the besis for the design pressures specified in Clauses 6.1.4 and 6.1.5 of Part 3.
All three parts of this Standard have undergone technical and editorial revisions since the previous edition. Some of the more noteworthy changes are as follows:
• Designs for fittings may now be registered through a central registration process administered by a nationally recognized organization (Part 1, Clause 4.2.3).
• Manufacturers of fittings with more than one plant or facility must now submit proof of a quality control program for each plant or facility where production occurs (Part 1, Clause 4.2.4).
• Organizations wishing to repair boilers, pressure vessels, pressure piping, or fittings must now submit proof that they maintain a satisfactory quality control system (Part 1, Clauses 4.9.2 and 4.9.3).
• The informational requirements for nameplates affixed to boilers, pressure vessels, and fittings have been revised (Part 1, Clause 5).
• Part 2 contains revised requirements concerning fire protection (Clause 6.9), design changes (Clause 6.16), failure to meet test requirements (Clause 6.17), and test methods (Clause 14).
• Part 2 contains a new annex on the procedure for requalifying all-steel natural gas vehicle storage cylinders (Annex B). This annex is referenced in Part 3 as well.
The users of this Standard should note that it is a recommendatory document only and does not have the force of law except where it has been officially adopted by a Canadian jurisdiction. Users should also note that adoption does not necessarily mean that the Standard has been adopted unchanged. For example, a jurisdiction may decide to make a non-mandatory annex mandatory.
In addition, owners and users of cylinders designed to the requirements of Part 2 should note that the safe operation of such cylinders requires, first, compliance with the service conditions specified by the manufacturer, and second, use of the cylinders only during the service life specified by the manufacturer. Each cylinder is marked with an expiry date, and owners and users are responsible for ensuring that a cylinder is not used after that date.
The Technical Committee intends to meet periodically to review this Standard and, if necessary, to revise it to meet changing conditions and maintain uniformity of practice throughout Canada.
This Standard was prepared by the Technical Committee on Boilers and Pressure Vessels, under the jurisdiction of the Strategic Steering Committee on Public Safety, and has been formally approved by the Technical Committee.
(1) Use of the singular does not exclude the plural (and vice versa) when the sense allows.
(2) Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose.
(3) This publication was developed by consensus, which is defined by CSA Policy governing standardization - Code of good practice for standardization as "substantial agreement. Consensus implies much more than a simple majority, but not necessarily unanimity". It is consistent with this definition that a member may be included in the Technical Committee list and yet not be in full aggreement with all clauses of this publication.
(4) CSA Standards are subject to periodic review, and suggestions for their improvement will be referred to the appropriate committee.
(5) All enquiries regarding this Standard, including requests for interpretation, should be addressed to Canadian Standards Association, 5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N6.
Requests for interpretation should
(a) define the problem, making reference to the specific clause, and, where appropriate, include an illustrative sketch;
(b) provide an explanation of circumstances surrounding the actual field condition; and
(c) be phrased where possible to permit a specific "yes" or "no" answer.
Committee interpretations are processed in accordance with the CSA Directives and guidelines governing standardization and are published in CSA's periodical Info Update, which is available on the CSA Web site at www.csa.ca.