- High Temperature (HT) rings and modules are similar to standard EFC inflatable rings but are capable of testing pipes operating at up to 350°C (660°F) provided that the ring is used in the manner specified in GUL's Standard Practice for GWT of High Temperature Pipe-work (GUL 207:2013).
- In order to carry out the guided wave inspection, only a 50 cm (20 inch) wide strip of insulation needs to be removed. No couplant is required and the inspection can be performed while the pipe is still on line.