PIPING STRESS CALCULATION ACCORDING WRC 107

[ROMEUM2]

Hi all,

I have a piping system with a pipe of NPS 32". The specification of the pipe is API 5L (thk 8.7 mm) and i have a corrosion of 1.5 mm.

When i try to do the calculations according WRC 107, i have a problem because my software (microprotol) say me that the ratio d/t is higher than 100.

Anyone knows if i have to take into account the corrosion allowance d/(nominal thk - CA) or we can use the expression d/nominal thickness.


Thanks,

 

[BigInch]

d/t is limited to prevent pipe with bad characteristics (easy ovalization and failure by a squash-type collapse) of your pipe.

You should deduct the CA from all calculations where extra wall thickness would give a more favorable (unconservative) result. That would normally exclude, among others, when calculating dead weight of pipe, provided you are not calculating the dead weight to use in a buoyancy calculation.

What would you be doing, if you knew that you could not fail?

 

[LSThill]

ROMEUM2 (Mechanical)

WRC 107 has been replaced by WRC 537

http://www.eng-tips.com/viewthread.cfm?qid=299344

WRC 537 has replaced WRC 107

http://www.forengineers.org/wrc/WRC Bulletin 537 Errata_S.pdf

Additional Technical Update received today form Welding Research Council - Forengineers

http://www.forengineers.org/cgi-bin...ion=view;mode=1;page=1;id=554;.cgifields=sort

 

[DSB123]

LSTHILL,
Doesn't "WRC 107 has been replaced by WRC 537" and "WRC 537 has replaced WRC 107" both mean the same? So why write it twice?? Great Cut and Paste of the "links" though!!!!