gland nut torque spec

[hholland]

Hello to the group,
I am designing a piece of test equipment. I have a gland on each end, that holds a test specimen that is sealed with an oring in the face. The glands will be tightened firmly against the face of the barrel, basically making it a blind thread. My question is, is there a torque spec for that application, and how do I calculate it. The thread details are, 8.25-12tpi. The glands are 316ss and the barrel is hastelloy C. Any input would be greatly appreciated. Than you in advance.

[Kelly_Bramble]

Not sure you're using the word "Gland" right..

The gland is what the o-ring is captured in or groove, slot or whatever.

The minimum torque - force should be that required to properly compress the o-ring and resist any other forces encountered in the design.

For force vs torque calculations see:

Bolt Torque Clamp Force Equation

Bolt Torque Clamp Force Calculator

[jboggs]

Also, I have found the Parker O-ring Handbook to be a very useful reference for all things regarding O-ring applications.

[hholland]

Not sure you're using the word "Gland" right..

The gland is what the o-ring is captured in or groove, slot or whatever.

The minimum torque - force should be that required to properly compress the o-ring and resist any other forces encountered in the design.

For force vs torque calculations see:

Bolt Torque Clamp Force Equation

Bolt Torque Clamp Force Calculator

Thank you for the input. You are correct, I should have said head nut, as j don't have a "gland" in this application. I know I have all of my seal dims correct. My client just needs a torque spec for the head nut, if applicable. I will look at the links you posted. Again thank you for your input.

[hholland]

I have already pressure tested to 4500 and it passed with flying colors, just trying to finalize details to wrap up project.