Re: Allowable Stress

From: <Itzhak>
Date: Mon Aug 27 2001 - 05:46:00 EDT

Hello,

B31.1 for example gives a basic allowable stress, for pressure and it is S for our discussion. For stress due to thermal expansion, the code allowable value is:
1.5 * S.
The total allowable stress due to pressure and sustain laod and thermal is: S+1.5*S=2.5 * S
For sustain and pressure, Plus wind or eartwake load for a short time, The allowable stress due to B31.1 is 1.2 * s and for B31.3 it is
1.33 * S.

In addition, it is permitted to add the unused stress due to pressure to the thermal stress allowable.

Best Regards
Itzhak Shdemati

• "SARE, RALPH H." <SARERH@YANPET.SABIC.com> wrote:
  >
  >
  > In piping and B&PV code the term "Allowable
  > stresses" always comes
  > up. IGot more confusing, since the Code also throws
  > up one for pressure and
  > another for thermal expansion.
  >
  > In the tradition of "for dummies book series", what
  > is the allowable
  > stresses?
  >
  > The real fun begins when the Code permit the
  > allowable stress for
  > pressure design to be exceeded. This has confusesd a
  > lot of piping
  > designers. What is really the Code saying about
  > this. An illustration will
  > be much appreciated
  >
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  ---

Best Regards
(:- Itzhak Shdemati -:)

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