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Ultrasonic Testing System
System SNUS

Ultrasonic Inspection of
HSAW Pipes

System SNUS

Three stages of ultrasonic test systems are typically installed in the production line of helically submerged arc welded pipes (HSAW) intended to be used for oil or gas pipelines. The raw base material comes as flat metal sheets supplied in coil form. Testing is done prior to welding on the flat strip or after welding on the finished pipe. The surface coverage depends on the number of ultrasonic probes and whether an oscillating probe movement is added. In recent years, solutions with 100% surface coverage were presented for strip testing systems. Second stage is the ultrasonic testing of the weld seam on-line directly after welding (on the virtually “endless” pipe). Thus, the weld quality can be checked in an early production stage. After cutting the pipes to their specified length and after undergoing the hydrostatic test, a final ultrasonic test is performed. Laminations within the pipe body, the heat-affected zones besides the weld and the pipe ends are tested with straight beam ultrasonic incidence (TR-probes). Additional angle beam incidence detects longitudinal and transverse defects in the helical weld. A special feature to avoid complex setups is the on-bead probe pair for transverse defect detection using the squirter coupling technique.

Current Dates

13 - 17 November 2017
15th APCNDT, Singapore

16 - 20 April 2018
Tube 2018, Duesseldorf

24 - 27 April 2018
32nd Control, Stuttgart

11 - 15 June 2018
12th ECNDT, Gothenburg

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