Gasket Stress

PSI (pound / square inch) pressure, stress, strength) is not the same as N-m (energy, work done) ML^-1T^-2 vs ML²T^-2

one is force/ unit area the other is force x distance

If you want it is in N/M^2.

You can get any number of online calculators to do this like this one

and it has a lot of others attached too.

Newton-metres might be the torque on the bolts needed to secure the gasket, perhaps?

You must be right. How can I miss that .

OK Edgar, there are somewhere between 10-100 threads on CR4 on this subject- check any of them. (any way most have to be and are repetitive)

For those who are used with SI, the post is also confused about the use of capital letters. To clarify to the poster: N is for Newton; m is for meter; psi for pounds-per-square-inch Nm would be for torque in SI. NM does not exist.

Hello Guest,

It's clear what you seek but, we can't help without further details:

• What is the size of the bolts being used?
• What is the grade/material of the bolts being used?
• What K Factor do you think may apply?
  

Once you have these data, torque can be calculated in Imperial units (ft-lb) and then be converted into the SI units which you want (N-M)

With regards to the above K Factor: If the value which you choose is not the same as the actual friction factor, your calculated torque will not develop the desired gasket stress.

Here's a link to a page with some simple bolt load calculation spreadsheets that might give you a good start.

... the above information will suffice if the joint has already been designed and you're simply looking for the torquing value for a known flange size/rating and operating conditions. If you're starting from scratch, there will be much more work involved!