(eq. 2-8 SI)

Where:

3

Kv = flow coefficient, m /hr @ ∆p = 100 kPa (1 bar)

Qs = steam flow, kg/hr

(1 + 0.00131 (Tsh)) = superheat factor.

Tsh = superheat temperature, degrees C

0.161 = compressibility and conversion factor.

pe = absolute pressure of the steam entering the valve, kPa

po = absolute pressure of the steam entering the coil, kPa

∆p = pressure drop through the valve, kPa

(eq. 2-8 IP)

Where:

Cv = flow coefficient, gpm @ ∆p = 1 psid

Qs = steam flow, lb/hr

(1 + 0.0007 (Tsh)) = superheat factor.

Tsh = superheat temperature, degrees F

2.11 = compressibility and conversion factor.

pe = absolute pressure of the steam entering the valve, psia

po = absolute pressure of the steam entering the coil, psia

∆p = pressure drop through the valve, psid

Tsh is the superheat temperature of the steam reduced to the lower pressure from the higher pressure.

2-27

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