bolt tighten in flanges 3

[Gasdealer]

Hello,
i need the tables which show the maximum torques in flanges with different diameters and bolts numbers!
pipes are ANSI 600

 

[TGS4]

This data is highly dependant on your gasket. So, what gasket are you using? Why don't you ask your gasket manufacturer to provide their recommendations to you?

 

[TGS4]

You should also consult ASME PCC-1. Although it does not provide "maximum" torque values, it will give you some guidance regarding flange assembly, as well as some torque values.

 

[PAN]

Gasdealer,
Bolt material should be a factor for your consideration (not only gasket and bolt dimensions).

 

[vpl]

On 23 Apr 07 13:13, JLSeagull (Electrical) wrote:

Check ASME B18.16.

transfered from duplicate thread 378-185007.


Patricia Lougheed

Please see FAQ731-376 for tips on how to make the best use of the Eng-Tips Forums.

 

[CreativeVessel]

Tightening a bolt based on torque values can be quite risky as the torque is directly related to the coefficient of friction and can vary greatly with the amount and type of lubricant used (or the amount of sand and grit in the threads). The best way to tighten a bolted joint is to determine the bolt load per bolt and then use that force to determine the elongation in the bolt and the rotation of the nut needed to seat the nut against the flange.

Ie Bolt stress / Strain = E (or Stress / E = Strain) therefor: change in bolt length = Length * (Stress / E)

Knowing the pitch of the threads used, you can determine the rotation of the nut needed.


Regards,
CreativeVessel

 

[SnTMan]

CreativeVessel, while all you say is true, torque control is still the most widely used method of tightening bolts in gasketed joints, and I would not really charcterize it as "quite risky". None of which really answers Gasdealer's question

Agree with TGS4, see PCC-1.

Regards,

Mike