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thickness to be used in a raised face flange 1

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frfouqa

Mechanical
Joined
Jun 14, 2012
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FR
Hi,
I 'm looking for an information.
I try to compute a blind flange 8" 300lbs (from the B16.5) as a flat head drilled with a 40 mm hole diameter.
The american standard say that the minimum thickness is tf=39.7 mm and the raised facing is 2mm.
To know if my blind flange is adequate under pressure, can i consider the thickness of the flange is 39.7 mm or 41.7 mm to do calculation ?
And gnerally speaking, can we consider the thickness of the raised face for calculation?
Thank you for your answer.


 
frfouqa, compute it how?

See ASME B16.5, Para 6.4 for facings dimensions.

See ASME Sec VIII, Div 1, Apx 2, Fig 2-2, General Note (b) for this Code.

Regards,

Mike
 
frfouqa,

You don't need to perform pressure calculations if the hole is just 40mm.

The B16.5 pressure-temperature of your 8" Class 300 blind flange is still valid if the corroded I.D. of the hole does not exceed 88.9mm. Check Table 6 of ASME B16.5.



 
Hello,

Thanks for you answer.
I find ine the general note of the ASME (as SnTMan has suggested to me) that if the facing thickness is greater than 1.5 mm, i Can't take it.
Regards,
 
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