bolt torque

[studbolter]

What guidelines are there for allowable bolt loads per the ASME code references? How much torque is too little or too much?

 

[bvi]

There is no specific limit. However, a good general practice for commonly used bolting materials is to torque them to a preload stress value of 50,000 psi. The amount of torque to achieve that will depend upon lubrication and bolt diameter, and whether the nut to flange contact surface is also properly lubricated. A good reference on bolting flanged joints is an ASME document, PCC-1 Guidelines for Pressure Boundary Bolted Flange Assembly.

 

[unclesyd]

Once you learn about the bolting as suggested in cb4 in the ASME document here is a handy calculator for bolting standard flanges.

If there is any doubt about bolting of any kind consult with someone with expertise in the field.

http://www.welding-units.co.uk

There is also some good information at

http://www.boltscience.com

 

[ijzer]

See appendix S of ASME VIII-1 for more info about bolt loads

 

[arto]

also see ASME PCC-1 "Guidelines for Pressure Boundary Bolted Flange Joint Assembly"