# RTO care

## Empirical formula Water, steam, gas

상태와 변화2016.07.09 04:16

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Empirical Formula of thr flow of Water, Steam, Gas

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◎ Hazen and Williams Equation (Only water flow)

Q = 0.000599 d^2.63 c ((p1 - p2)/L)^0.54

Q : flow rate [l/min]

d : internal diameter [mm]

c : constant

140 - new steel pipe

130 - new cast iron pipe

110 - riveted pipe

p1 : inlet pressure [bar_g]

p2 : outlet pressure [bar_g]

L : length [m]

◎ Babcock Equation (Only steam flow)

△p = 6.76 ((d + 91.45)/d^6) W^2 L V

△p : pressure [bar_g]

d : internal diameter [mm]

W : flow rate [kg/hr]

L : length [m]

V : specific volume [m3/kg]

◎ Spitzglass 식 (Low pressure gas; 7kPa 이하)

q = 0.00338 √((△hw d^5)/(Sg L (1+ 91.5/d + 0.00118*d)))

q : flow rate [m3/hr] (@ 15℃, 1.013 bar_a)

hw : static pressure head [mm H2O]

d : internal diameter [mm]

Sg : specific gravity of gas [ ]

L : length [m]

◎ Weymouth 식 (High pressure gas)

q = 0.00261 d^2.667 √[((p1^2-p2^2) / (Sg Lm)) * (288/T)]

q : flow rate [m3/hr] (@ 15℃, 1.013 bar_a)

d : internal diameter [mm]

p1 : inlet pressure [bar_a]

p2 : outlet pressure [bar_a]

Sg : specific gravity of gas [ ]

Lm : length [km]

T : absolute temperature [K]

[이 게시물은 운영자님에 의해 2008-03-22 00:48:37 유체역학에서 이동 됨

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