Recent content by Mateeng

Hi Everbody, I came across and noted NACE MR0175/ISO 15156-2 Table A.2 considered API 5L pipes up to grade X65 material as prequalified material for SSC resistance complying with A.2.1 requirements. May we extend that to CSA Z245.1 Steel Line pipe up to Gr. 448 which has similar Yield strength...

Quick question: what type of weld is this (girth, longitudinal, branch, attachment, etc.)? Answer: Tee Joint weld /Non pressure part attachment joint

Eye pad Weld to trunion (non pressure part to no non pressure part) allowed without PWHT. Only approved WPS to be used. No weld without PWHT on pressure boundary is permitted.

Hi John121, The head itself no need any stress Relief heat treatment after forming because the fiber elongation is less than 5%. However the shell to head weld shall be subjected to to PWHT based on the shell thickness assigned soaking time in UCS-56. The reason for soaking time base on shell...

Hello Everybody, Just need help to establish the Knock Down Factor for a pipeline is subjecting to sour services. This factor is to be determined with a series of fatigue tests in air and simulated actual sour service. Does anybody know any lab capable of doing this test or had experience on...

Hi Lee, Great!!! Let me see other options. Actually if we go with Solid CRA/CRA weld overlay flange then wonder which the type of ring gasket we to use. Soft Iron does not work. Same CRA material (Alloy 625) would work and may provide the necessary sealing? Have you heard about rubber coated...

I posted this question in corrosion Forum and prefer our piping fellows see this post and advise with a recommendation. Does anybody can help find a suitable ring joint gasket suitable for FBE coated RTJ flange? We a have a FBE coated piping with Class 1500# rating and Ring Joint Flange. Metal...

You have to use a reducing flange. Please refer to B16.5 and search for reducing flange. There you can find criteria for reducing flanges even using blind flanges to make reducing flanges. Some weld size and strength calculation may needed. It will give you an idea to use the standard (B16.5)...

Happy Holidays, folks!!! Does anybody can help find a suitable ring joint gasket suitable for FBE coated RTJ flange? We a have a FBE coated piping with Class 1500# rating and Ring Joint Flange. Metal ring gasket like Soft Iron ring gasket may damage the FBE coating of the groove and cause...

347H PWHT is prone to reheat cracking (RHC). In service also susceptible to same. ASME VIII Div. 1 UHA-A-10 recommend PWHT for 347 heavy sections. wonder which way to go. Also any repair also increase risk of RHC. To me perform FAU after welding. Perform PWHT. Perform FAUT after PWHT. Any...

Thanks Metengr, Any suggestion for intermediate stress relief temperature and time.

Just carious to know how about heavy sections and reheat cracking. I do understand reheat cracking may happen either in high service temperature or during PWHT. Any solution for 347H/347 reheat cracking. Thanks

Thanks all for input to subject.

Accept my apology. I did double check and the correct preheat is 500 F. It looks like there was a mistake in temperature unit. It is much better condition 500 F compare to 500 C for manual welding. Now we should see how we can accommodate the welder to work with 500 F min preheat. Any suggestion...

Dear Folks, Thanks for all great responds. The reason we approached automatic welding is we have to keep the interpass temperature not less than 500 C to avoid the PWHT as per weld engineer instruction. Manual welding facing 500 C is not easy for welders. We are looking to take the advantage of...