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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Received on Mon Aug 27 05:46:00 2001