How to apply Appendix S on Appendix 2 Flanges
How to apply Appendix S on Appendix 2 Flanges
(OP)
Client has mandated that the body flanges of S AND T EXCHANGERS be checked against Appendix S; according to the siad appendix it is suggested that bolt stress be as follows 45000/bold dia. I dont know as to how to apply this bolt stress, should we choose the material of the bolt such that its allowable value is greater than that recommended by Code Appendix S or ??? I would be obliged if advised as to how apply the said Appendix advice in COMPRESS BUILD 6300.
RE: How to apply Appendix S on Appendix 2 Flanges
Appendix S is a discussion on preloading flange bolting after the flange has been designed. The allowable stress for bolts to be used in the design of Appendix 2 flanges is as defined in Appendix 2; the appropriate maximum allowable stress from Section II, Part D, Table 3. In addition to Appendix S, I recommend you review PCC-1, "Guidelines for Pressure Boundary Bolted Flange Joint Assembly". PCC-1 is available from ASME Order Department.
Don Kurle PE
Codeware Technical Support
RE: How to apply Appendix S on Appendix 2 Flanges
I would like to welcome your opinion.
regards,
Muhammad Imran Mirza
RE: How to apply Appendix S on Appendix 2 Flanges
Don Kurle PE
Codeware Technical Support
RE: How to apply Appendix S on Appendix 2 Flanges
Or we can only comply Appendix S thereby using Sa value, determined as 45000/d, the Gasket Crushout width; you see, it will be increased if Sa is increased and resultantly it will influence other Flange Loads as well.
RE: How to apply Appendix S on Appendix 2 Flanges
But the Appendix describes the formula as "The probable bolt stress developed manually, when using standard wrenches". So they are describing the probable actual stress resulting in a bolt that is manually tightened; there is no mention that this is the allowable stress.
The next paragraph states "it can be seen that smaller bolts will have excessive stress unless judgment is exercised..." Thus the point made is that smaller bolts may easily be overstressed by tightening without special procedures, whereas larger bolts may be insufficiently tightened.
"Although this forum is monitored by Codeware it is not intended as a venue for technical support and should not be used as the primary means of technical support."
Tom Barsh
Codeware Technical Support
www.codeware.com
RE: How to apply Appendix S on Appendix 2 Flanges
S=45000/d
S= Nominal bolt stress, psi
d=the nominal bolt diameter.
I would like you to read it as well and I hope your opinion will be different.
Regards,
Mirza
RE: How to apply Appendix S on Appendix 2 Flanges
"Although this forum is monitored by Codeware it is not intended as a venue for technical support and should not be used as the primary means of technical support."
Tom Barsh
Codeware Technical Support
www.codeware.com
RE: How to apply Appendix S on Appendix 2 Flanges