Flowmetering Gilflo and ILVA flowmeters 3
Sizing the Gilflo 'B' flowmeter (metric) In order to determine the flow capacity of a Gilflo 'B' flowmeter for a particular application, it is necessary to calculate the equivalent water flowrate (Q E ) based on the maximum anticipated actual flow.
Mass flow units
Volumetric units
q m SG q m SG q m
q m SG q m SG q m SG
Q E = Q E = E =
Q E = Q E = E =
Q SG E = Q L Q SG E = Q L E = Q L
Q SG E = Q L Q SG E = Q L E = Q L
Liquids
D F D F
D F D F D F 1 000 1 000 Q 1 000 Q
Q Q 1 000 1 000 1 000 D F D F
1 000 1 000 1 000 D F D F D F
Q E = q m Q E = q m E = q m
Q E = q m Q E = q m E = q m
E = Q F E = Q F E = Q F
E = Q F E = Q F E = Q F
1 000 1 000 F 1 000
Gases and steam actual flow conditions
F
q m q m q m
q m q m q m
D S D S P S T F P S T F 1 000 P F T S 1 000 P F T S x x S P S F 1 000 P F T S x x
D S D S D S P S T F P S T F 1 000 P F T S 1 000 P F T S x x Q E = Q S P S F 1 000 P F T S E = Q S x x Q E = Q S
Q
E =
Q Q
E = E = E =
Q E = Q S D S x P F x T S 1 000 P S T F D S x P F x T S 1 000 P S T F Q E = Q S E = Q S S x P F x T S 1 000 P S T F
D S x P F x T S 1 000 P S T F D S x P F x T S 1 000 P S T F Q E = D S x P F x T S 1 000 P S T F E =
Gases standard conditions
Where: D S
3.2 34
= Density of gas at standard conditions (kg/m 3 )
D F
= Density of gas at actual flow conditions (kg/m 3 )
= 1.013 bar a = 1.033 kg/cm 2 a = 14.70 psi a
= Standard pressure (atmospheric)
P S
P F Q E Q L
= Actual flow pressure in same absolute units as P S
= Equivalent water flowrate (litres/min)
= Maximum liquid flowrate (litres/min)
Q S = Maximum gas flowrate at standard conditions (litres/min) Q F = Maximum gas flowrate at actual flow conditions (litres/min) q m = Mass flowrate (kg/min) SG = Specific gravity T S = Standard temperature (K) = ° C + 273 T F = Actual flow temperature (K) = ° C + 273
TI-P337-08 EMM Issue 9
Page 4 of 7
Gilflo 'B' Flowmeter Pipeline Unit
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