What is the ASME code for FRP piping?

It is not uncommon for us to get questions about FRP standards. One of the most common ones is, &#;What is the most appropriate Code or standard for our project. If you look at the choices for Codes and standards in most pipe stress analysis software, you would see that ISO is listed as an option for FRP piping.  ISO is a European standard for FRP/GRP/GRE piping. It is very detailed and offers a lot of good information. Also, it is very demanding on the FRP piping manufacturers for certified material data and physical properties for their specific piping product to be used on the project. For example, ISO requires long term hydrostatic design basis (HDB) testing in accordance with ASTM D to develop allowable stresses. This is a 10,000 hour or 10,000 cycle test that is material specific and takes about 15 months to complete. When I say material specific, that means the it is only valid for the specific resin, specific glass reinforcement and construction method of the tested pipe. It has been our experience that there are only a few piping manufacturers in the world that can truly meet all of the requirements of ISO for a specific FRP piping project. Without quantifiable certified data, the level of certainty in the analysis approach may be reduced and unpredictable. Unless the approved piping manufacturers have been pre-qualified to meet all of the requirements of ISO , including material specific HDB testing, I would not recommend applying ISO as the required project standard for FRP piping. Today as a more reliable path, I would recommend specifying ASME B31.1 or ASME B31.3 as the applicable piping Code for your custom FRP/GRP piping projects, particularly projects executed in the U.S. or by U.S. firms. Conversely, many GRE manufacturers have completed the necessary testing and are able to meet the qualifications for ISO . When specifying ASME B31 Piping Codes, a current and quality FRP piping specifications is imperative. Current, means they should have been updated in the last 5 years. A detailed specification help to supplementary and integrate the implementation of the Piping Codes. If your project or corporate specification have not been updated to a FRP experienced materials specialist in the last 5 years, I would recommend that you make that a priority, if you have FRP piping projects on the horizon. The value of an updated specification will be substantial for piping design and inspection compliance and the cost is relatively small.

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I would be interested to hear about your challenges with piping standards for FRP/GRP.

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ASME NM.2 provides requirements for the design, materials, manufacturing, fabrication, installation, inspection, examination and testing of glass-­fiber-reinforced thermosetting-resin (FRP) piping systems. The standard addresses both pipe and piping components that are produced as standard products and custom products that are designed for a speci­fic application. In addition, the standard allows for a variety of manufacturing methods of FRP pipe and piping components including, but not limited to, contact molding, compression molding, centrifugal casting and filament winding.

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