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SGS Industrial Services has announced that it has carried out phased array inspection in Nigeria for Daewoo E and C at the Gbaran Ubie Integrated Oil and Gas Project.

Phased array ultrasonic inspection is said to be one of the latest weld inspection methods and offers technical advantages for weld testing.

It is an advanced non-destructive testing method, which reveals defects hidden inside a structure or weld by testing the structural integrity.

The ultrasonic testing technique is based on generating and receiving ultrasounds.

Instead of a single transducer and beam, phased arrays use multiple ultrasonic elements and electronic time delays to create beams by constructive and destructive interference.

In early 2008, Daewoo E and C was awarded the contract to construct a gas plant for the Gbaran Ubie Integrated Oil and Gas Project in Nigeria.

In order to ensure high-quality construction work, Daewoo asked for the support of SGS Industrial Services.

Daewoo chose to conduct phased array as it is said to offer technical advantages for weld testing over conventional ultrasonic testing methods.

Phased array generates multiple ultrasonic signals within nanoseconds, which produce controllable angles, focus depths and/or wide coverage of an inspection point.

Other advantages include good repeatability, increased inspection speeds, more accurate results and the ability to inspect complex geometries.

Furthermore, phased array inspections are safer to operate within a working environment, compared with non-destructive testing methods that use X-rays and gamma rays for detecting imperfections.

On 9 May 2008, SGS Industrial Services provided a team of five experts to carry out phased array testing on the project in Nigeria, scheduled to take 15 man-days.

The project comprised two phases.

The first phase involved the phased array inspection of 155 joints of heavy wall line pipes and the second phase included the follow-up inspection of 300 joints that were recently welded.

The priority objective of SGS’s phased array testing was to inspect the welds for defects and to provide a reliability report.

The successful completion of SGS’s work resulted in the contract with SGS Industrial Services being extended until the Gbaran Ubie Integrated Oil and Gas Project in Nigeria is completed.

SGS SA – Industrial Services

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