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  1. vpkhati

    Seamless pipe and welded pipe query..!!

    Dear all, thank you very much for your valuable reply. ... Normallly we also design above 12" pipe as welded construction... so here the allowble strees factore criteria comes into the picture... But if we are purchasing a pipe from the stockist. then he need to perform the 100% radiography...
  2. vpkhati

    Seamless pipe and welded pipe query..!!

    Dear All, Can anyone tell me the size limitation upto which we can go for seamless pipe or welded pipe. Specification SA 106, SA 312, SA 790 calls for seamless pipe, but above NPS 12 our supplier is giving welded pipes? What should be the criteria of acceptance for welded pipes.? Are there...
  3. vpkhati

    Column v/s Vessel v/s reactor

    thanks a lot pennpiper.... can u explain me the effect of earthquake, wind on these equipments... does the length of the equipment comes into consideration when hit by an earthquake or a wind ...?
  4. vpkhati

    Larsen-Miller Parameter and Hollomon Parameter

    Metengr, thank you very much for your explaination. Could suggest me some good literarure were I cxan read about theses two parameters in detail.
  5. vpkhati

    Column v/s Vessel v/s reactor

    Hi, Can anyone tell me the difference between a column and a vessel and a reactor. (P.S. : Please explain me considering the geometry and the service)
  6. vpkhati

    Structural bolts and service bolts

    Hi, Can anyone explain me the difference between service bolt material and structural bolt material and why cant we use SA-193 B7 material instead of SA 320 Gr. L7 (P.S. : Client has specified Anchor chair material sa SA 320 Gr.B7 and we are having SA-193 B7 in stock) DOES the metallurgy or...
  7. vpkhati

    Larsen-Miller Parameter and Hollomon Parameter

    Hello everyone, I have a doubt and confusion, Please explain me why do we use LMP (Larsen-Miller Parameter) and HP (Hollomon Parameter), and do we use it only for 2 1/2 Cr - 1 Mo. materials (is it because we are using API - 934 A) ..? WHAT is the use and basis of these parameters.. please...
  8. vpkhati

    Full radiography of joints for lethal service

    Hello everyone, Can anyone provide me the basis of radiography level for lethal service, like why do we give full radiography for the lethal service job. (UW-2(a) and UW-11(a)(1) - All butt welds shall be 100% radiographed, agreed but why ). Also in some specification it is given that above 50...
  9. vpkhati

    Vacuum Stiffener Ring radiography

    If the vessel is a mounded bullets, and EEMUA code is applicable, then we have to fully radigraphed the stiffening ring also..? can someone put light on this..!!!
  10. vpkhati

    Basic of Pressure vessel Design

    Hi, I am very new to the pressure vessel industry. I would like to know the basic concept of the pressure vessel design. Below are my queries.. 1. How is the pressure maintained in the pressure vessel and how do we decide the working pressure and design pressure of the equipment. ? 2. What...
  11. vpkhati

    Welded Pipes in pressure vessel

    Hi, I have one query and doubt regarding welded pipes. Can we use welded pipes instead of seamless pipes. The stockiest has given us the option of welded pipes because he is not having the pipe over 20” in seamless condition for the required Schedule ( The pipes are of SA 312 TP 316L & SA790...

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