Thermal relief valve calculaiton
Thermal relief valve calculaiton
(OP)
As required by the API RP 520, I need to know the way to calculate the thermal expansion coeficient per ºF for a given chemical product.
Can you help me?
Can you help me?





RE: Thermal relief valve calculaiton
RE: Thermal relief valve calculaiton
Or you can also refer to the Heat Transfer handbook by Kern to name a few.
API Technical Databook will also give some figure.
Hope this help.
thanks
rusman
process
RE: Thermal relief valve calculaiton
beta = (1/V) (dV/dT)
Glycerine is at 0.00052/C. Water, as usual, behaves in an unusual way below 4C. Tabulated beta for water @ 25C: 0.000256/C.
Isothermal compressibilities, kappa = - (1/V) (dV/dP) would help in estimating the pressures developed per degree, on heating a packed liquid, by dividing beta by kappa.
For example, for octane kappa @ 25C is 0.00128/MPa. Thus the developed pressure at this temperature level would be : 116/128 MPa/C = 0.9 MPa/C =
9 bar/C. For tetradecane @ 25C: 87/91 x 10 = 9.6 bar/C. For water @ 25C,
(25.6/45) MPa/C = 0.57 MPa/C = 5.7 bar/C.
I hope the above is helpful.