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# thickness to be used in a raised face flange

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 frfouqa (Mechanical) 14 Jun 12 10:48
 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.
 SnTMan (Mechanical) 14 Jun 12 11:15
 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
 doct9960 (Mechanical) 14 Jun 12 11:52
 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.
 frfouqa (Mechanical) 15 Jun 12 3:41
 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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