Workshop: A Comparison of ISO 14692 and ASME NM.2

Fibreglass Reinforced Plastic (GRP/FRP) piping systems are governed by different international standards, most notably ISO 14692 (first issued in 2002) and ASME NM.2 (first issued in 2018). While both adopt performance-based elements, their design philosophies and calculation procedures differ significantly.

In this workshop, Lukas Bajarunas, engineer at Dynaflow Research Group (Dynaflow being a founding member of the ISO 14692 certification commitee), provides a structured comparison of the two codes. The session begins with general remarks on GRP code philosophy, highlighting the distinction between base performance requirements and fully performance-based design as applied in ISO 14692.

The four design routes in ASME NM.2 are explained namely: design by rules using allowables from ASME NM.3.3, long-term regression testing in accordance with ASTM D2992, short-term testing methods, and stress analysis supported by FEA. These are compared with ISO 14692 requirements, including differences in regression methodology, SIF treatment and load type factors.

A detailed case study compares design envelopes obtained using each method, followed by a piping flexibility example in CAESAR II demonstrating differences in SIF application and governing equations. The emphasis is on understanding how code selection directly influences calculated stresses and compliance margins.
Participants will be taken through the qualification procedure for FRP piping conform ISO 14692-2 and can ask detailed questions to the instructor to ensure they leave with knowledge they apply in their future work.