STANDARDS FOR PROCESSING PLANTS – Z662-03 and B31.3 ppsx

January 17, 2005 AMENDED INFORMATION LETTER #OGC 04-26

SUBJECT: STANDARDS FOR PROCESSING PLANTS – Z662-03 and B31.3

This letter serves to clarify the design and construction standards for processing plants.

The Pipeline Regulation, Section 12 (1) and (2), Standard for Pipelines, requires installation, operation

and welding to be in accordance with CSA Z662. Section 13 requires all pumping stations and

compressor stations to be installed in accordance with the requirements of Canadian Standards

Association (CSA) Z662. Section 16 states the requirement of CSA Z662 for oil storage tanks (or to

American Petroleum Institute (API) Standards 12B, 12D, or 12F, depending on the size and type of

construction of the tank). Section 21 states the requirement for operation and maintenance procedures on

oil and gas pipelines to CSA Z662, unless otherwise approved. The intent of the Regulation to specify

CSA Z662 is very clear. However CSA Z662 does provide an option to use American Society of

Mechanical Engineers (ASME) B31.3, as follows.

CSA Z662-03 4.10.2.7.3 “It shall be permissible to design each type of piping system within compressor

stations, in its entirety, in accordance with the requirements of ASME B31.3.

Notes: 1) All other requirements in Clause 4 relating to compressor station design are applicable.

2) Examples of types of piping systems included are those for main service fluids, lubricating oil, water,

steam, processing, and hydraulic fluids.”

CSA Z662-03 4.10.3.5.4 “It shall be permissible to design each type of piping system within pump

stations, in its entirety, in accordance with the requirements of ASME B31.3.

Notes: 1) All other requirements in Clause 4 relating to pump station design are applicable.

2) Examples of types of piping systems included are those for main service fluids, lubricating oil, water,

steam, processing, and hydraulic fluids.”

CSA Z662-03 6.1.4 “Compressor and pump station piping designed in accordance with the requirements

of ASME B31.3 (see Clauses 4.10.2.7.3 and 4.10.3.5.4) shall be installed in accordance with the

installation requirements of ASME B31.3.”

CSA Z662-03 7.2.4 “Compressor and pump station piping designed in accordance with the requirements

of ASME B31.3 (see Clauses 4.10.2.7.3 and 4.10.3.5.4) shall be welded in accordance with the welding

requirements of ASME B31.3, provided that the applicable requirements of Clauses 7.2.7, 7.7.11, and

7.10.2.2 of this Standard are additionally met for any welds other than partial-penetration butt welds.”

CSA Z662-03 8.1.7 “Compressor and pump station piping designed in accordance with the

requirements of ASME B31.3 (see Clauses 4.10.2.7.3 and 4.10.3.5.4 of this Standard) shall be

pressure tested in accordance with the pressure testing requirements of ASME B31.3.”

In summary, the Pipeline Regulation directs that CSA Z662 be followed. However, CSA Z662 allows a

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