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Mr.Lawrance - PQR- All weld metal test

Friday, October 03, 2003   By: Yogendra
Dear Mr.Lawrance, I am still struggling for the clarification . May I request you to give the guidance. I am trying to explain the situation as below. we are in the process of fabrication of one LNG TANK as per API-620.The tank fabrication is being done at site. Since for procedure qualification, API-620 calls for use of section IX, We have qualified a weld procedure, for the base metal SA 553 Type 1 with electrode ENiCrMo-6 in 3G position. In order to qualify the procedure as per section IX, we have carried out all tests e.g, Tensile , bend, impact,hardness etc. Since the application calls for the Use of Appedix-Q (API 620) and as per Appendix -Q clause 6.1(please refer clause 6.1 of API 620) (the specified Tensile stregth of the electrode is 620 MPa , and of base metal is 690 Mpa) , we have to carry out the two all weld metal tensile tests also. My question is only for the All weld tensile test as required by above clause. My Query is - Instead of all weld metal tensile test in PQR test coupon, is it possible to refer the electrode test certificate, certified by manufacturer for all weld metal tensile test results. Or in other way , in order to meet the requirements of clause 6.1 of Appendix Q (API-620) , is it necessary to go for all weld metal test from the PQR test coupon itself or for this test we can refer the electrode manufacturer test certificate (where allready all weld metal test results are given, which were carried out at their factory). I hope , My query is now more clear and you will suggest me.

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