CSA Z662 Oil and gas pipeline systems

ISBN/PUB: Z662 23
Pub Date: 2023

CSA  Z662 Oil and gas pipeline systems

This is the ninth edition of CSA Z662, Oil and gas pipeline systems. It supersedes the previous editions published in 2019, 2015, 2011, 2007, 2003, 1999, 1996, and 1994.


The following are the significant changes to this edition:


a) Clause 3 and Annex A have been revised to provide a common framework for audits;


b) Clauses 4 and 7 have been revised to address concerns with gross girth weld strength under- matching and heat affected zone softening, when welding high strength line pipe for a stress-based design pipeline;


c) Clause 17, on composite reinforced steel pipelines, has been deleted. A new Clause 17, on hydrogen and hydrogen blend pipeline systems, has been added.


d) For hydrogen and renewable gas: 


i) the scope has been updated to


1) confirm hydrogen and hydrogen blends are included in the standard;


2) confirm that renewable gas is equivalent to wellsite produced gas; and


3) clarify that other gas sources and processes, not just wellsites, can produce hydrogen and renewable gas;


ii) a new Clause 17 had been added to formally integrate hydrogen requirements into this Standard; and


iii) changes have been made throughout this Standard to aid with handling unique design, material, construction, and operational requirements for pipelines containing hydrogen.


e) For safety class: changes have been made in Clauses 4and 10to permit pressure design in accordance with Annex C;


i) Annex C has been revised to include a safety class designation approach for a selection of service fluids. Where 


ii) Annex C is used for pressure design, safety class is used instead of class location, as a basis for defining the maximum allowable hoop stress;


iii) Annex C has been revised to include a table that maps the safety class determined according to the Annex onto a class location. The class location derived from this table is used as a basis for identifying the applicable requirements in all other class-location-dependent clauses of this Standard.


f) Clause and Table 7.4 have been revised to allow the use of volumetric NDE to replace nick breaks for welding procedure qualification and welder qualification and expand the allowable limits of porosity in nick breaks;


g) New content has been added to Clause 10 provide more clarity for the necessary right-of-way activities to continuously address potential hazards to the pipeline system.


h) Clause 12.5.7 has been aligned to Clause 5.7.1 in regard to a more prescriptive requirement for records retention to include retention of material test reports for all steel pipe and components.


i) Additional content has been added to Clause 12 to address cross bore mitigation.


j) Annex B has been revised to include more detailed requirements for performing a risk assessment and quantitative acceptance criteria for safety and environmental risks.


k) Annex N has been revised to align with the Annex B revisions.


l) Revisions have been made to the requirements for the design pressure and design wall thickness of field cold bends made from steel pipe, where the longitudinal axis is not deflected more than 1.5° in any length along the axis equal to the outside diameter of the pipe.


m) A new requirement has been introduced to obtain and retain material test reports for pipe and components.


n) Requirements have been expanded for threaded or welded auxiliary connections on blind flanges of various sizes.


o) Additional limitations have been imposed on ASTM A105/A105M flanges.


p) New requirements have been introduced for induction and cold bends through reference to specifications in CSA Z245.16 and Z245.17.


q) New requalification requirements have been introduced for coated pipe in extended storage.


r) New requirements have been introduced for hydrovac or air-vac operations.


s) Requirements have been updated for fluids containing H2S.


t) Requirements have been updated for cyclic pressure in reinforced composite pipelines, and new requirements for pulsation dampeners.


u) New requirements have been introduced for use of reinforced composite pipe in gas transmission service.


v) New requirement has been added for certain transition pieces to be registered as per CSA B51.


w) Requirements have been updated for the repair of defects in polyethylene pipe prior to and during installation.


x) Requirements have been updated for materials for elevated temperature service pipelines.


y) New requirements have been introduced to address effect of liquid hydrocarbons in pipe wall on heat fusion joining of PE pipe (in other than gas distribution service).


z) Requirements have been revised for PE pipe pressure testing (in other than gas distribution service).


aa) Requirements have been included for corrosion resistant alloy risers and interconnecting piping for lined pipelines and polyethylene pipelines.


bb) Requirements have been updated for sour service pipelines to ensure that Clause 16 will be consistent with the next version of MR0175/ISO15156.


The requirements of this Standard are considered to be adequate under conditions normally encountered in the oil and natural gas industry. Specific requirements for abnormal or unusual conditions are not prescribed, nor are all details related to engineering and construction prescribed. It is intended that all work performed within the scope of this Standard meet the standards of safety and integrity expressed or implied herein, and that the requirements of this Standard be applied with due regard to the protection of the environment, which includes land, water, plant life, and animal life. Detailed requirements concerning the protection of the environment are not prescribed.


It is expected that changes will be made from time to time, based on new experience and technology. Where necessary, amendments and supplements will be prepared by the Technical Committee and published in accordance with CSA Group practices.


CSA Group acknowledges that the development of this Standard was made possible, in part, by the financial support of Natural Resources Canada.


This Standard was prepared by the Technical Committee on Petroleum and Natural Gas Industry Pipeline Systems and Materials, under the jurisdiction of the Strategic Steering Committee on Petroleum and Natural Gas Industry Systems, and has been formally approved by the Technical Committee.


This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.

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CSA  Z662 Oil and gas pipeline systems

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