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Joint efficiency & Radiography - API 650

Joint efficiency & Radiography - API 650

Joint efficiency & Radiography - API 650

(OP)
What is the relationship between Joint efficiency and Radiography per API 650 ? Can a Joint efficiency of 1.00 be used for design and Spot radiography be applied during construction.  What is the normal engineering practice ?

RE: Joint efficiency & Radiography - API 650

The basic design requirements of API-650 are to use a joint efficiency of 1.0 and the RT requirements of Section 6.  The extent of RT is based upon the plate thickness.  At the low end of the scale (thickness of 3/8 and less) only a limited number of RT shots are required.  At the high end (thickness greater than 1 inch) full RT is required.

There are two additional options available when specified by purchaser.  Appendix A uses less RT than the basic Standard with E = 0.85.  When no RT is performed E = 0.70.

The term "joint efficiency" is probably not the best term to use.  Perhaps "quality factor" would be better, but that's another topic.   

Steve Braune
Tank Industry Consultants
www.tankindustry.com

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