51312-01646-Issues Involved in the Development of a Testing Program and Production Qualification Procedure for S

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Product Number: 51312-01646-SG

ISBN: 01646 2012 CP

Author: Lucien Hehn

Publication Date: 2012

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Issues Involved in the Development of a Testing Program and Production Qualification Procedure for SSC-Resistant Friction-Type Welds for a Fully SSC-Resistant Intervention Riser.Sour service drill pipe product has long been in use with tool joints and tubes separately meeting criteria for sour service through IRP 1.8 prior to welding. The weld area of the final product is omitted for SSC testing. Reports of field failures of sour service drill pipe occurring in the weld area have been rare. In SSC laboratory tests failures in the weld area can occur without additional process control procedures. Friction-type welds have several features which differ from fillet-type welds for which detailed qualification procedures are outlined in NACE TM0175. Friction-type welds present some unique challenges in obtaining SSC resistance. This paper will demonstrate that with an ongoing testing program selection of appropriate testing stress levels and alloys and strong end-user (customer) interaction a set of production qualification criteria for SSC resistance of friction-type welds is possible. A Vickers hardness based production qualification procedure for friction-type welds which was developed and verified through SSC testing will be discussed.This SSC-resistant weld was developed for a very specific application: an intervention riser. End-user interaction was critical in developing testing procedures specific for the expected field environment conditions.