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  1. nipra03

    Factor in ASME B31.4

    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...
  2. nipra03

    Steel fittings : Limitations on SMYS : SR 5, MSS-SP-75

    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...
  3. nipra03

    Establish pressure ratings .MSS-SP-44, B16.5

    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...
  4. nipra03

    ASME Sec VIII Div I Appendix 2 flanges: hydrotest pressure criteria

    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...
  5. nipra03

    Use of B31.4 for temperatures belwo -30 degrees

    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...
  6. nipra03

    Pot Bend Heat Treatment : Induction Bends : B16.49

    main pipeline, liquid service (LVP),above grade & below grade locations, design temp. 40C, design pressure 800 psig.
  7. nipra03

    Pot Bend Heat Treatment : Induction Bends : B16.49

    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 ?
  8. nipra03

    Induction bends ASME B16.49 : Qualification bend tests and their significance

    thaks metengr ............. thats what we ended up doing !!
  9. nipra03

    Pot Bend Heat Treatment : Induction Bends : B16.49

    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...
  10. nipra03

    Induction bends ASME B16.49 : Qualification bend tests and their significance

    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...
  11. nipra03

    Caesar II and API 1102

    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 ...
  12. nipra03

    EHT and galvanised pipe

    thanks gr2 ! appreciate your feedback.
  13. nipra03

    Swagelok type compression fitttings and the codes

    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 ?
  14. nipra03

    EHT and galvanised pipe

    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...
  15. nipra03

    vertical load check of bare piping on beams

    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.
  16. nipra03

    Dampening of pressure pulses downstream of Centrifugal pump

    Correction. I mean't 9000 kpag. any thoughts guys ?
  17. nipra03

    welding of different grades of pipeline steel

    Hi, I want to know the impact of welding different grades of carbon steel e.g. API 5L X52 to X65 or X42 to X52. For strength purpsoes I understand the common practice is to consider the weaker steel for the complete assembly, but my question is more from the metallurgical and weldability point...
  18. nipra03

    Modal analysis modelling of branch connections in CII

    Hi. I want to know if anyone has done a modal analysis of small bore bramch connections (<=2") on larger pipe(> 20") in CII ? Are the results comaprable to say a FEA analysis ? And can one run a fatigue analysis on such a cnnection due to say a harmonic forcing function i.e. vibration of the...
  19. nipra03

    Branch Reinforcement requirement on elbows

    Hi, I want to know if the B31 codes specify unique requirements for reinforcement of branch connections on elbows and bends or are they to be treated as for straight pipe ? Similarly are the branch SIF's to be treated differently ?
  20. nipra03

    Dampening of pressure pulses downstream of Centrifugal pump

    The issue is realistic. The concern here is that pressure pulses can cause vibration and worse - resonance in the piping system especially in attached small bore cantilever type connections e.g. instrument/ drains/vents as a result of the pulse resonating with the mechanical or acoustic natural...

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