The Long Range Guided Wave Ultrasonic Technique now called Guided Wave Testing (GWT) was designed to inspect 100% of a pipe segment from one single location.
How it Works:
To explain how it works as torsional or longitudinal guided waves are induced into the pipe body and propagated along the pipe segment being inspected. When these guided waves identify an anomaly or pipe feature, the waves convert into laminar waves and reflect back to the GWT Tool’s original location. We use a laptop computer to digitally capture the results. The time-of-flight for each signature is calculated to determine it's distance from the tool. The cross sectional area is calculated by amplitude and then the circumferential extent determined by the focused to determine the significance of the defect.
GISS (USA), meets and exceeds the PHMSA 18 points to examine casings and crossings. The primary application is within the Oil and Gas Refining, Petrochemical, Storage, Offshore and Pipeline Transportation industries.
GISS (USA), has international certified technicians that have inspected over 1,000 miles of pipe using the guided wave ultrasonic technique and are considered the most experienced in the industry.
GWT is used to inspect difficult to access tubular and piping system such as:
- Insulated Pipe in Refineries
- Offshore Pipeline Risers
- Cased Road or Railway Crossings
- Loading Lines and associated Pipe work
- Tank Dyke Pipeline Crossings
- Above Ground or Buried Flow Lines
- River or Bridge Pipeline Crossings
- As part of ECDA & ICDA Methodologies