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Pipe Stress Analysis

AFAA have decades worth of experience undertaking pipe stress analysis to most ASME, British Standards and UK Gas Industry standards in the oil and gas industry.

Most recently we have undertaken Option A and Option B pipe stress analysis, as required by IGEM/TD/13 for operation with hydrogen or hydrogen/methane blends. This will become increasingly important as parts of the UK gas network transition to hydrogen or hydrogen/natural gas blends.

Static Analysis

Static analysis considers all environmental loads, including: thermal effects, pressure, weight and seismic loads.

We have worked closely with designers to offer a cost effective solution for readily creating pipe stress models using laser scan technology.

Pipe stress analysis services:

  • IGEM/TD/12

  • PD 8010-1 & 2

  • ASME B31.3 / B31.4 / B31.8 

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Dynamic Analysis

Piping may be subjected to various types of dynamic loads, such as slug-flow, acoustic pulsation and water hammer.


A slug of liquid formed in a vapour line creates a density discontinuity which produce unbalanced forces on bends and causes the piping system to vibrate.

Acoustic Pulsation

Resonance may be established from a pulsating flow from a reciprocating compressor, generating a high pressure pulsation.

Water Hammer/Surge Analysis

When the flow in a piping is suddenly altered, such as that caused by a slam-shut valve, a compression/rarefaction wave travels down the line causing the piping to vibrate resulting in potentially high stress and loads at supports and connected equipment.

Case Studies

Pipe stress analysis

AFAA supported the project to perform pipework stress analysis of the replacement Feeder 9 pipeline to be installed in a purpose built tunnel beneath the River Humber. We were also responsible for undertaking the FEA of the new grouted tees installed to tie-in to the existing Feeder 9 pipeline.


We have performed numerous pipeline crossing assessments to facilitate the proposed new HS2 route. Our role does not end at assessment output and were able to provide engineering solutions where excessive load transfer to existing pipelines was predicted.

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Ground movement was identified at a gas installation using laser scan monitoring. Pipe stress analysis was used to determine the effects of the predicted settlement and subsequent FEA assessments were undertaken to consider both immediate and long term risks. Recommendations were provided to enable continued operation and thus increase the design life of the site.

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Spring hanger sizing analysis was undertaken to provide an optimised solution to support electro-hydraulic actuators. Recommendations were made for the placement and sizing of the hangers in order to limit the stress in the piping system and ensure the load on associated compressor nozzles remained within an acceptable limit.

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