Hot Induction Bends Testing Methods for Qualification and Production Bends

[bdp6632]

While reviewing specifications of hot induction bends for buried pipeline, a question was raised as how the production bends are tested for hardness. ASME B16.49 states about the testing requirements. It states that we have to manufacture qualification bends first which should be exactly the same as the regular production bends would be and then perform some mechanical tests on those qualification bends. Later it says that exactly at the same locations, tests should again be done on “production” bends too. These are like V notch, hardness and fracture toughness types of tests, I am talking. My question is how they would do that on production bends. My understanding is that these tests are done on sample piece cut from the parent component and once you cut those pieces for the test, you remaining production bend is garbage.
In short want to learn, how the test methods/ procedures are different for “qualification” bends and “production” bends

 

[Jimmyqci]

Check out ISO 15590-1 table 2 requirements for for qualification test bends and Production bends are.

Not sure if this spec is applicable, but a good source of information for induction bends.

 

[SJones]

Think of it like a weld - a weld is qualified on a test piece, but it doesn't make sense to keep chopping out good bits of production weld to test them. The test bend serves as validation of the properties of the production bend within the confines of the essential variable limitations. Thus, testing of production bends is normally restricted to non-destructive testing.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[Duwe6]

Check for ovality and wall thinning, 10% to 100% of the number of production bends. The 'Production Bends' mentioned are probably intended to be a random sampling of in-process pieces. Can't do destructive testing on the parts you want to use.

 

[weldstan]

Production bends may be hardness tested, WFMT examined and examined as per Duwe6.