Flange Gasket Compression

I invite you to come with me & rummage through all these to find answer to your questions among THESE

i don't understand why your're anticipating losses. losses in what? velosities, pressures?, misalightment? do you expect the gasket to intrude into the pipe interior? what type of gaskets are you refferring to.

give use enough information we can work with.

for the purpose of flange leakage check, to obtain the leak proof joint, there should be minimum required compression of gasket is needed to overcome the losses due to all loads(pressure,applied force and moment) after initial bolt up connection.

for clarity

please find below reference calculation for flange leakage check.

i'm searching for how to calculate Cp,Cm,Cf,Creq.

GASKET COMPRESSION: COMPRESSION

(mm.)

After Initial Boltup (Ci)........... 0.0038948697

Loss-of due to Pressure (Cp)........ 0.0001500553

Loss-of due to Applied Moment (Cm).. 0.0002828453

Loss-of due to Applied Force (Cf)... 0.0000257736

Loss-of due to all loads (CL)....... 0.0004586742

Initial minus all Losses (Ci-CL).... 0.0034361957

For Leak-Proof Joint (Creq)......... 0.0005378210

Excess available (Ci-Creq) ......... 0.0033570488

LEAKAGE SAFETY FACTOR: (If less than one then joint

leakage is predicted.) (Allowed/Actual)

Pressure Only (Ci-Creq)/Cp ............. 22.37

Force Only (Ci-Creq)/Cf ................ 130.25

Moment Only (Ci-Creq)/Cm ............... 11.87

Pressure+Force+Moment (Ci-Creq)/CL ..... 7.32

It is easier to measure torque. Flange bolts are flogged-up to a predetermined torque setting, which is determined from schedules, and the piping systems then subjected to a variety of pressure-fall tests as required from the piping class and the material they contain in accordance with client-organisation-specified piping standards.

It would be very rare to specify a mechanical compression distance in the gasket material instead.

Have you measured above values? If yes, then how? I also want to learn.

If no, from where you got it? The same source will be capable to answer your question too.

But one thing I am sure that these values may vary a lot (in %) with respect to material, thickness and manufacturer of gasket besides load (torque applied), class of fitting, flange seating surface etc.

the above mentioned values are not measured values, these values are obtained from one software which is used to calculate flange leakage, i'm just searching for on which basis formula, these calculation are made.