Dear All,
I have been waited for long time to get some light from you. Anyway ,I got some information on Energy institute Guideline to calculate the forces for quick opening of shutdown valves as shared below....
Multiphase mass flowrate (W) in Kg/s,
Specific heat ratio (g),
Gas constant ( R) in K/K.mol,
Molecular weight (Mw) in g/mol
Upstream Temperature (Te) in K
Static pressure drop (dP) in Pa
Multiphase density ( r ) in Kg/m3
As per Energy Institute Guideline, Technical Module-02 (TM2)
Peak force (Fmax) in kN
For Dry gas valve opening..(W/1000)* SQRT[2*g*R*Te/(g+1)*Mw]
ForLiquide/multiphase valve opening.... (W/1.58)x SQRT[(dP.10-5)/r]
Likehood of failure (LOF) Calculation........
Dext= Pipe outer diameter in mm
Dint = Pipe internal diameter in mm
y = Actual pipe wall thickness/Schedule 40 pipe wall thickness
"Achieved minimum fundamental natural frequency based on software simulation in Hz"= f (this will give you type of support arrangement and correction value from Table T2-1 and T2-4
Correction factor (q)
Limit force (Flim) in kN
(16.8*y3-1.81*y2+525*y+25.3)*Dext*q*п*Dint2/(4*109)
Likehood of Failure (LOF)= Fmax/Flim
If LOF is less than 1.0, susceptibility of fatigue failure due to flow induced vibration (FIV) can be treated as 'Negligible', Otherwise ....
Study the recomended guideline....best of luck.
_________________________
S Koley