Publications
| Title | | Authors |
|---|---|
| Verification of the applicability of the EPRG Tier 2 guidelines for misaligned girth welds in large diameter onshore pipes through full-scale bend and wide plate tensile testing « back |
W N Schipaanboord, R M Denys, A A Lefevre and P Roovers |
| 12th PRCI/EPRG Joint Technical Meeting, Groningen, Holland, May 1999 | |
| The EPRG guidelines define in Tier 2 defect limits (7 X W.T. long by max. 3,O mm (0,118 in) deep), which exceed the workmanship defect acceptance criteria. Since Tier 2 had been validated for welds wiihout misalignment (hi-lo), experimental work was needed to establish an upper limit for the hi-10, below which the Tier 2 defect limits are still applicable. Also the issue of non-destructive (NDT) inspection of pipeline welds by automated ultrasonic testing (AUT) needs further development and verification work. To elucidate these, the EPRG Sub-Committee 'Weld Defects' has perforrned a verification Programme consisting of full-scale bend and wide plate tensile tests on girth welds in 762 mm (30 in) pipes. The approach and most highlighting results are described in the Paper. The work has demonstrated that, with a joint misalignment of 2,5 mm (0,098 in) in 9,8 mm (0,385 in) wall pipes, the Tier 2 defect limits are still applicable. | |
| Paper request | |