GW - Guided Wave

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Long Range Ultrasonic testing (LRUT), also known as Guided Wave Ultrasonic testing (GWUT), is a method wherein ultrasonic waves are transmitted along the pipe wall (guiding walls) up to 180 meters in length.

LRUT is a fairly fast method for integrity assessments of pipelines, encased piping, suspended pipelines and coated pipes. It is a good method used to locate potential degradation or integrity concerns. While conventional NDT is more of a localized spt check type of inspection, Guided Wave allows us to run a test that go over ten meters and on the entire circumference of the pipe from one location.

Primarily applied on pipelines having limited access or only localized access; to avoid unnecessary excavation, coating removal or scaffolding installation. The use of LRUT significantly reduces maintenance costs and is a perfect inspection method for unpiggable pipes or inaccessible pipe sections. LRUT can be used on pipe diameters ranging from 38mm (1.5″) to 120mm (48″) to detect loss of cross section (LSC) or areas of concern such as corrosion or erosion pockets around the pipe’s circumference.

Typical applications include:

Rapid inspection of in-service pipelines and piping for detecting corrosion or areas of concern
Buried pipelines at the excavation locations or at level crossings
Encased pipelines, culvert line, or PE coated pipes
Vertical pipes or structural circular columns
Inaccessible piping e.g. overhead piping rack
For quick inspection of at height locations, reducing the need for additional setup time
Insulated pipelines and piping – No need to remove entire pipeline insulation
Detection of corrosion at pipe supports, clamps and pipe racks
Refinery, chemical plants, power station piping
Risers and offshore topside pipe work
River crossing pipelines, tank farm link lines and sewer lines