Please check PED annex I 4.1 (a). The requirements of 7.5 apply to pressurized parts
The bolts are not pressurized. The are subject to compressive stresses
Dr. G. Dilintas
I&F Regional Technical Manager
Bureau Veritas Piraeus - Greece
Tel: +30 210 40 63 113/4
Fax: +30 210 40 63 118
"Pisat, R. (Rahul)" <Rahul.Pisat@akzonobel.com>
Sent by: materials-welding@googlegroups.com 22/03/2010 15:48
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Hello all,
Does anyone has a experience of using A193 B8 Cl. 2 bolting for ASME B16.5 flange assembly for temperature range of -29 to 450 deg C and pressure class 150 & 300 ?
Please guide me any specific limitations for its application ?
Also few specific concerns are :
1) A193 code has a note stating "Austenitic steels in the strain hardened condition may not show uniform properties throughout the section particularly in sizes over 3/4 in in diameter ". But Design Code 31.3 has not mentioned any limitation for same size range.
2) As per Pressure Equipment directive ( PED ) regulation for Ductile material ,its elongation after rupture is no less than 14 %. But as per ASTM A193 B8 Cl.2 , mechanical properties Table 2 , elongation in 4 D. min % , is ( for bolts below 3/4"inch diameter ) is 12 . Are these 2 parameter comparable ?
Does it mean that, as per PED , B8 CL.2 material for small diameter is not sufficiently ductile ?
waiting for your replies.
Kind regards
Rahul
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