Subsea GWT

With the experience gained from many inspections in both the North Sea and the Gulf of Mexico, GUL’s Subsea GWT equipment has evolved into a reliable modular system.

GUL Subsea rings are easily adjusted to fit different pipe sizes, and are available for both ROV or diver deployment.

The advantages of using the Sub-Sea rings include:

  • Screening unpiggable sections of line for internal or external corrosion/erosion.
  • Screening under weight coat and insulation with minimal cleaning and excavation.
  • On-site analysis allows the ROV to perform follow up indications.
ROV Deployed

A Subsea G4mini is mounted on the ROV. A hydraulic connection is used for opening and closing the ring. The test is carried out from the ROV control room.

Diver Deployed

The test is controlled via an umbilical from a topside interface box to the Wavemaker instrument. The rings are installed on a clean section of pipe by 1 or 2 divers using a mechanical clamping mechanism.

Specifications ROV

Number of Channels
Nominal Pipe Size (NPS)
6” to 10” (DN 150 to 250)
Operating Depth
Down to 3,000 msw
Transduction System Compatibility
Wavemaker® Subsea G4mini only

Specifications Driver

Number of Channels
Nominal Pipe Size (NPS)
4” to 26” (DN 100 to 650)
Operating Depth
Any diver depth
Transduction System Compatibility
Wavemaker® G4mini ( < 50m depth) Subsea G4mini ( > 50m depth)


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