Equivalent pressure for flange design under external load,
Pe = P + 4F/PI*G^2 +16M/PI*G^3

How to calculate 'M' and 'F' ?

if having flange:
flange: 72"
external pressure: 1.05 kg/cm2
gasket OD: 1869 mm
gasket ID: 1843 mm
'G' = 1856 MM

Thanking you in anticipation.

M is the moment acting on the flange.

F is axial load pulling the flanges apart.

You would get that from the piping analysis. Ask the pipe stress engineers who have modeled the piping to which this flange is connected to.

As Mandeep has explained, M is bending moment and F is axial force. The external loadings on flange will be either provided by Piping Engineer or Client. It can also be taken by designer based on forces and moments acting on flanges of equipment under design.

Thanks.

Muksh Chopra
www.theculminates.com
M:+91-9428500192

THIS IS THE INPUT PROVIDED BY PIPING. But i did some work which is useful for you . SEE BELOW.

regards
MUKESH KALRA



CASE -1
TORSIONAL MOMENT Bx150XD2

RESULTANT SHEAR FORCE Fr=( Fx2+Fz2)^0.5=BX2500xD

AXIAL FORCE Bx2000xD

RESULTANT B.M Bx164xD


LOAD FOR NOZZLE MKD NO (M1,B& A)

D 12 inches
B 0.9
TORSIONAL MOMENT 19440 Nm 1982.34 Kgf-m
RESULTANT SHEAR FORCE 27000 N 2752.3 Kgf
AXIAL FORCE 21600 N 2201.83Kgf
RESULTANT B.M 1771.2 Nm 180.61 Kgf-m
regards
MUKESH KALRA
09540077713