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Long range ultrasonic testing reduces risk of unplanned shutdown

11 January 2010

To minimise the risk of costly unplanned shutdowns, SGS has conducted Long Range Ultrasonic Testing (LRUT) of risers for Chevron Nigeria, one of the world’s largest energy companies. This relatively new inspection method can be applied for critical pipe work, risers under clamps, insulated or even buried pipes whilst in operation.

Long range ultrasonic testing reduces risk of unplanned shutdown
Long range ultrasonic testing reduces risk of unplanned shutdown

Corrosion in pipe work is a major problem in oil and gas, chemical and other industries. Many pipes are insulated which means that corrosion cannot be seen without removing the insulation. Severe problems are encountered at road crossings and with buried pipelines where the pipes cannot be inspected without major excavation resulting in costly shutdowns of the plant.

Similar problems occurred at the Chevron terminal in Escravos, Nigeria. Chevron, was having specific problems with risers due to corrosion and was subsequently looking for ways to inspect the risers without closing the whole field, which would have resulted in millions of dollars in lost revenue.

At this point SGS offered to conduct Long Range Ultrasonic Testing. Chevron was able to check the condition of the risers and schedule shutdown for repairs, thus saving costs.

Long Range Ultrasonic Testing, also known as Guided Wave Technology, is a newly accepted Non-Destructive Testing (NDT) method for evaluating insulated pipes, cased sections, road crossings, compressor station piping, buried pipelines, tank dike piping and most piping systems which are difficult to access and which in the past could not be inspected economically.

The Guided Wave Technology screens 100% of the volume of the piping inspected. A typical application of LRUT is the detection of corrosion and metal loss in pipes and pipelines. LRUT uses guided ultrasonic waves which can travel many meters with minimal attenuation and therefore offer the potential of testing large areas from a single point using a pulse-echo transducer bracelet wrapped around the pipe.

Cost-effectiveness, safety and speed were decisive factors in favor of performing the Long
Range Ultrasonic Testing for Chevron in Nigeria. As the inspection services of risers performed by SGS proved to be a great success, Chevron mobilised the SGS team to cover all the risers in the field, the process pipe work as well as road crossings. SGS is now monitoring all critical pipe work offshore, underground pipe work as well as road crossings in the terminal.

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