RE: Bending Stress ASME B31.3

From: <Sheth>
Date: Tue Apr 15 2003 - 13:18:00 EDT

Bending stress of 2300psi refers to the beam and not to the pipe. I believe this figure is a very conservative figure considered so that beam can be assumed to be very 'stiff'. Higher values of bending stress in the beam will increase the deflection of the beam itself; thereby increasing the stresses on the pipe which are supported by that beam.

Does it make sense?

Best Regards,

-Chirayu Sheth

-----Original Message-----
From: <a href="/group/PipingDesign/post?postID=mHE814gBoKVacqMF0G2ppx93P_20V3xMRjiHn81wh0KNIXce734MTwET2J4jIQTzk6yzHb47DXKaiXB7NWA">conor.walshe@alcan.com</a> [mailto:<a href="/group/PipingDesign/post?postID=mHE814gBoKVacqMF0G2ppx93P_20V3xMRjiHn81wh0KNIXce734MTwET2J4jIQTzk6yzHb47DXKaiXB7NWA">conor.walshe@alcan.com</a>] Sent: Tuesday, April 15, 2003 1:40 AM
To: <a href="/group/PipingDesign/post?postID=JTkMm69NgVsVGIzYQTF9qHvA4KnKsEoAKnk9hjaGg2hTVMeS7TRpzRB8XC4y8eZpXmS5G0pyOCHYUJHBxS57NmeUEuwP6Q">PipingDesign@yahoogroups.com</a> Subject: [PipingDesign] Bending Stress ASME B31.3

Does anybody know why B31.3 specifies (Table 121.5, General Note C) the bending stress does not to exceed 2300 psi (15.86 MPa)

I beleive the 2300 psi is the allowable stress at 400 degrees C divided by 4, A106 grade A. I could understand it being divided by 2 (PD/2t), but am at a loss to explain the division by 4.

Can anyone set me straight.

Kind Regards

Conor

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Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a> Received on Tue Apr 15 13:18:00 2003