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ASME B31.4 VS CSA Z662

ASME B31.4 VS CSA Z662 by Meena Rezkallah, P.Eng. for engineering Services across canada and USA.

This article focuses on the comparison of ASME B31.4, Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids and CSA Standard Z662, Oil and Gas Pipeline Systems. Significant issues which are expected to be the basis of continued discussion include:

  • Increasing the design factor in the US to the Canadian value of 0.80

  • Depth of cover requirements

  • IM requirements.

The liquid pipeline standards in the US do not provide even the minimal level of guidance found in the gas pipeline standards for concepts of strain-based design except for offshore liquid pipelines.

Table below provides a tabulated version of comparisons between US and Canadian liquid pipeline design.

ASME B31.4

CSA Z662-15

ASME B31.4 is a piping code for the design, fabrication, installation, inspection, and testing of liquid petroleum pipelines. It covers pipelines from the source of supply to the point of delivery, including any necessary appurtenances, and provides requirements for materials, design, fabrication, assembly, erection, examination, inspection, and testing. The code is intended to be used in conjunction with other ASME B31 codes, such as B31.3, B31.8, and B31.9.

CSA Z662-15, Oil and Gas Pipeline Systems, is a Canadian standard that outlines the design, construction, operation, and maintenance of oil and gas pipelines. It is published by the Canadian Standards Association and has been in effect since 2015. It is intended to provide a comprehensive framework for the safe and responsible operation of oil and gas pipelines. The standards outlined in this document are designed to ensure the safe and efficient transport of oil and gas and to protect the public, workers, and the environment. The standard covers topics such as pipeline installation, operation and maintenance, integrity management, and emergency preparedness and response. It also provides guidance on the requirements for pipeline-related activities such as welding, testing, inspections, and repairs.

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Our professional piping stress engineers have a bachelor's and Masters degree in mechanical / structural engineering and province license (P.Eng.) in Alberta, Saskatchewan, British Columbia and Ontario. We review, validate, certify and stamp piping and structural packages. Also check Industries We Serve.

We provide premium piping engineering & full-service pipe design and pipeline / pipe stress analysis services, from initial concept through final construction. We serve all types of industries across Canada & globally. Using CAESAR II and pipe stress calculations as per API, ASME B31.3, B31.1, B31.8, B31.4, B31.9, CSA Z662.


Located in Calgary, AlbertaVancouver, BCToronto, OntarioEdmonton, AlbertaHouston TexasTorrance, CaliforniaEl Segundo, CAManhattan Beach, CA; Concord, CA; We offer our engineering consultancy services across Canada and United States. Meena Rezkallah.

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