Re: B31.1 SV Nozzle Design

From: <John>
Date: Tue Feb 13 2007 - 22:42:00 EST

This is B31.1 piping and has nothing to do with Section VIII per se.

Ordinarily PSV piping is designed for pressure, sustained loads, thermal displacement loads, and occassional loads. This can be done by either manual or computerized methods.

"I have been told that the nozzle design must
  also be adequate for 6000 psi moment of thrust from valve discharge." Moments are Force x Length therfore there is no such a thing as a PSI moment.

"These two straight pieces will be supplied with nozzles
  for safety valve relocation and are in the B31.1 BEP side of the code   break." Relocation indicates to me that depending on the degree of relocation that there may be signicant changes in dealing with the PSV load. One way of doing this is in the clip I attached.

You really need to get a copy of B31.1 read through it in particular the chapter on PSV relief design.

Software is never a replacement for knowledge, which you may be lacking... so read the code first. Pay attention to the design chapter, the Appendix II Rules for the Design of Safety Valve Installations and Appendix V Recommended Practice for Operation, Maintenance, and Modification of Power Piping Systems.

Pressure vessels and piping are similiar in some ways but one codes practice is not neccesarily the same as anothers.

Best Regards,

John C. Luf
Cleveland Ohio U.S.A when I'm not in Austria

Member B31.3, Piping Engineer - Stress Analysis, Pipe Supports, Component Design, and Surge Analysis... according to my daughters master of unimportant trivia

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[Non-text portions of this message have been removed] Received on Tue Feb 13 22:42:00 2007