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Element’s pipeline testing facilities perform fatigue testing on steel catenary risers in our laboratory and on-site at the point of fabrication. Our testing containers can quickly be mobilized to various locations, making Element both flexible and faster than any other testing provider on the market.
Offshore oil companies commonly employ Steel Catenary Risers (SCRs) as a means of connecting surface installations with subsea pipelines. Steel catenary risers are subject to harsh environmental conditions that include cyclic loading as a result of wind and wave motion, tidal flow, vortex-induced vibration (VIV), and operational changes to temperature and pressure. These conditions make welds, and other stress concentrating features, sensitive to fatigue cracking when in service. To mitigate against premature failure while in service, fabricators are often required to test the fatigue resistance of any proposed weld procedures before their use in SCR installations.
Two approaches are used to assess the fatigue sensitivity of welds; small-scale testing on extracted coupons, and full-scale testing on entire welds:
Element’s resonant fatigue testing rigs are fully integrated into modified shipping containers, making the rigs self-contained, modular, and mobile. Each container is equipped with its internal lifting system, and all equipment necessary to load, test and unload prepared test strings. The containerized design has several benefits over conventional lab-based models:
To find out how our experts can advise on weld fatigue testing on catenary risers, or to request a quote, contact us today.
For more information you can download our White Paper "Fatigue Testing of Pipeline Girth Welds using Resonance Technique" in the Resources section.