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Anonymous Poster #1

Internal Design Pressure

04/12/2014 10:20 AM

For valve bolting calculation in ASME B16.34 we consider pressure as a class designation ( such as 150, 300, 600,900,1500 & 2500). In ASME section viii div.1 for valve joint bolting calculation can we consider the internal design pressure (P) same as class designation?
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Anonymous Poster #2
#1

Re: internal design pressure

04/12/2014 2:08 PM

No....

ASME VIII clearly defines the design pressure. It is the maximum pressure that the system is expected to sustain at maximum pressure... plus a margin if desired.

You are aware the ASME B16.5/B16.34 pressure class designation IS NOT THE SAME as the maximum allowable pressure for the flange ?

A "Class 150" flange can, with the right combination of materials and temperatures, sustain much more than 150 psig.

You understand how this works........right ?
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PWSlack
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#2

Re: Internal Design Pressure

04/14/2014 5:20 AM

No, as there is no mention of temperature.

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Anonymous Poster #1
#3

Re: Internal Design Pressure

04/14/2014 6:09 AM

If design pressure is not given for valves can we consider 90% of maximum allowable working pressure as a design pressure?
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#4
In reply to #3

Re: Internal Design Pressure

04/14/2014 9:45 AM

"We" can do whatever "we" wants. However, it would be inadvisable to do anything without consideration of the temperature!

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