Recent content by nipra03

Hi Rich, Thanks for the clarification. I do have a follow up question regarding "unrestrained" sections of buried pipe i.e. say at a buried segement close to the transition from A/G to U/G and with particular reference to elbows in this segment. Pipe code Canadian CSA Z662. If we model the...

I am seeking any help regarding the rationale behind the limitation on actual yield strength to 20000 psi as specified by supplementary requirement SR 5 of MSS-SP-75, spec. for butt welded steel fittings. This requirement is not reflected in ASME B16.9. I have been told it is to ensure better...

both MSS-sp-44 and B16.5 state: "Rat ings for welding neck flanges covered by this Standard are based upon their hubs at the welding end having thickness at least equal to that calculated for pipe having 276 MPa (40,000 psi) specified minimum yield strength.1" It is not clear which piping code...

Hi All, Is it correct to to assume that a slip on flange designed to appendix 2 (say 275 psig design pressure) is also by default capable to withstand the full hydrotest pressure of 1.5 times the DP as allowed for say a B16.5 flange ? Per my understanding,the code does not directly address...

I was recently made aware that the B31.4 code states (400.1.2) that it was not developed for piping with design temp. less than -30 dgrees C. My query is what code do we follow for cases where we have lower temps e.g. -34 C as is the case for some areas of NE USA. The Canadian pipeline code...

main pipeline, liquid service (LVP),above grade & below grade locations, design temp. 40C, design pressure 800 psig.

Thanks meteng, weldstan. I agree that the vendor should abide by the terms of the Purchase order. An issue that concerns me is for this material grade should we insist on having stress relief as minimum HT ?

thaks metengr ............. thats what we ended up doing !!

Hi, I would like the opinion of experts here on an issue related to post bend HT for induction bends to ASME B16.49. A vendor is claiming that post bend heat treatment is not required for certain bends which have been ordered on them & per SR15.1, it does appear to be the case. some of my...

I have a problem regarding induction bends. A contractor ordered and installed 20" induction bends without going through the the process of making and testing the qualification bends as required per B16.49 and our specs. The actual bends were put into service without any NDE and the final...

Hi All, I want to know if Version 6.0 of CII does a check for the combined equivalant stress when performing underground piping analysis to check for stresses as per API 1102 ? I understood this was in the works some years ago but I do not know if this has been incorporated in the software ...

thanks gr2 ! appreciate your feedback.

I want to know whether the compression type type of fittings and joints used by Swagelok / Parker are actually allwed by code (B31.3 /B31.4 ? If yes under which clause ?

Hi, I have a consultant who advises against using EHT (electric heat tracing) on galvanised pipe for firewater purposes on the ground that the localised heating can deteriorate the internal coating, cause clogging & premature corrosion failure of the pipe. I am unconvinced that the problem is...

This issue of local stress analysis is not really addressed by the codes i.e. in terms of calculation formulae. A piping stress manual/text e.g. PENG and PENG will provide for working guidedlines.