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GWT

Guided Wave Testing (GWT) Services

Guided Wave Testing can rapidly screen long lengths of pipe from a single probe position, ideal for insulated and buried pipelines.

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What is Guided Wave Testing?

Guided Wave Testing (GWT) uses low-frequency ultrasonic waves that propagate along the length of a structure (typically piping) to screen for corrosion and defects over long distances from a single probe position. This technique is particularly valuable for inspecting insulated, coated, elevated, or buried piping where conventional inspection methods would require extensive preparation.

How GWT Works

1

Low-frequency waves propagate along pipe walls

2

Waves reflect from wall thickness changes and defects

3

Single probe position can screen 50+ meters of pipe

4

Torsional and longitudinal wave modes used

Applications of Guided Wave Testing

Insulated pipeline screening
Buried pipeline assessment
Road crossing inspections
Elevated piping in racks
Subsea pipeline monitoring
Cased pipe inspection

Advantages

  • Inspects long lengths from single position
  • No need to remove insulation
  • Can inspect inaccessible areas
  • 100% circumferential coverage
  • Rapid screening capability
  • Identifies areas requiring detailed follow-up

Limitations

  • Screening tool - not precise sizing
  • Limited by pipe features (supports, branches)
  • Sensitivity decreases with distance
  • Cannot inspect through flanges
  • Temperature limitations

Applicable Standards & Codes

ISO 18211
ASTM E2775
BS 9690
DNV-RP-G103

Industries Using GWT

Oil & Gas
Petrochemical
Power Generation
Pipeline

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