Wet testing aids inspection process
Welding inspection of offshore platforms has seen a large increase in the use of non-destructive testing (NDT) being done underwater. This form of wet NDT has increased due to its acceptance and necessity. Two of the more common NDT methods are magnetic particle/inspection (MPI) and ultrasonics. These two techniques are probably the most economical and effective types of wet NDT used on welds. Once the particular welds have been chosen for testing, procedures for the tests can then be established. These consist of: the type of inspection carried out and specific requirements of equipment used; the specific areas of testing and the means to identify these areas; method of cleaning the welds and size of area to be cleaned; methods of checking on the validity of the test and test equipment when in use by sufficient magnetism during MPI and calibration and sensitivity checks on ultrasonic equipment; and any post-testing work needed - repainting, anti-corrosion methods, normalization of test areas. Any MPI inspection will only reveal defects which emerge at the surface of the weld; it will not give indication of their depth nor will it show evidence of crack propagation extending below the surface at the ends of the MPI visible defect. (DP)
- Research Organization:
- Ocean Technical Services, London, England
- OSTI ID:
- 7034723
- Journal Information:
- Offshore; (United States), Vol. 39:14
- Country of Publication:
- United States
- Language:
- English
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