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Recommendation of Informal work group for changes to Weld Overlay requirements in API Spec 6A

SURFACE SYSTEMS. Recommendation of Informal work group for changes to Weld Overlay requirements in API Spec 6A. Chairman - Mike Briggs (Cameron) Members – Tim Haeberle (GE), Rodger Lawson (ExxonMobil), Kris Ohman (Shell), Joel Russo (FMC), David Zollo (FMC).

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Recommendation of Informal work group for changes to Weld Overlay requirements in API Spec 6A

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  1. SURFACE SYSTEMS Recommendation of Informal work group for changes to Weld Overlay requirements in API Spec 6A Chairman - Mike Briggs (Cameron) Members – Tim Haeberle(GE), Rodger Lawson (ExxonMobil), Kris Ohman (Shell), Joel Russo (FMC), David Zollo (FMC) RAISING PERFORMANCE. TOGETHERTM

  2. Background • Current structure separates clad requirements by product type (Ring grooves, stems, VBSM and choke trims) and CRA overlay for BBEOC • Acceptance criteria refers to BBEOC general NDE and is not tailored to overlays • There is a great deal of confusion throughout the industry on what is required on overlay and when one requirement applies or doesn’t

  3. Current questions and controversial issues • What surfaces do I inspect using UT? - 100% for part of Design Criteria; FBH Cal, .125” FBH Dia, • When I do the UT what size FBH do I use what MTD do I use on the cal block? MTD Max Clad +.100” • If I have a fully clad body do the ring groove get inspected to Weld overlay or CRA overlay? Should do the ring grooves the same as other cladding • On UT do I have to re-inspect base material after cladding (1/2”, 100% or none)? Area of examination shall include cladding plus a minimum of 0.100”of surrounding base material • Can I perform the UT on Ring Grooves prior to finish machining?

  4. Summary of WG’s proposed changes • Separate cladding in to two groups for BBEOC – partial clad and full clad • Procedure qualification requirements to be consolidated for ring grooves and CRA overlay • Add section specifically addressing weld overlay inspection requirements to section 7.4.2.1. This would address Visual Examination, Liquid Penetrant and Other testing. • Address the overlay requirements for each component type (Tables17, 22, 23 and 37) instead of in a general table as is done in table 18 now.

  5. Conclusions • Additional review is required to allow seamless blending of the requirements • There are several discrepancies in the current standard that have raised additional questions by the workgroup. • Will require API support to ensure any reference changes are accurately captured throughout the document

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