The figure of 1.25 was decided upon in a hot and steamy meeting in NEw York when the committee were preparing ANSI B31.1/31.3. If I recall the likes of Spiel Vogel and other eminent engineers of their time were present.
Like all standards committees there are personal views and compromises.
There is a paper describing the goings on at the meeting but it is many years since I have read the same.
The upshot is that it was selected based upon the experience of the engineers who gave their time voluntarily for the good of all. --- Sachin_Bapat@ril.com wrote:
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Piping code B31.3 gives value of expansion stress range as follows<BR>
&n\
bsp;
Sa=f((1.25(Sc +Sh) - Sl)<BR>
where Sc ,Sh, Sl,f have their usal meaning as defined in code.<BR>
My query is<BR>
How the code has decided upon this value of 1.25 ? What is the physical<BR>
significance of this value?<BR>
Views are invited from team members on the subject matter.<BR>
Regards<BR>
Sachin Bapat<BR>
<BR>
<BR>
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<tt>
Texas Flange - a good source for information on industrial flanges, all they
ask is for referrals for designs they help with.<BR>
877-610-8924.<BR>
www.texasflange.com<BR>
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