Flowmetering Gilflo and ILVA flowmeters 3
Sizing the Gilflo ILVA for saturated steam - lb/h Minimum and maximum flowrates in lb/h at different pressures (psi g) Note : Maximum steam flowrates are calculated at maximum differential pressure.
Steam pressure psi g
Size
15
50
75
100
150
200
400
600
Maximum Minimum Maximum Minimum Maximum Minimum Maximum Minimum Maximum Minimum
682 7
988 10
1153 12 4528 45 9288 93
1299 13 5103 51
1549 15 6081 60
1764 18 6926 69
2451 25 9627 96
3009 30 11815 118 24236 242 58571 585 115123 1151
2"
2677 27 5492 55
3877 39 7953 79
3"
10466 105 25295 252 49718 497
12473 125 30144 301 59249 592
14206 142 34333 343 67483 674
19747 197 47723 477 93801 938
4"
13273 132 26088 261
19220 192 37778 377
22448 224 44121 441
6"
8"
How to order Example: 1 off Spirax Sarco 2" Gilflo ILVA flowmeter suitable for fitting between ASME B 16.5 Class 150 flanges.
3.2 10
Sizing the ILVA flowmeter In order to determine the flow capacity of a ILVA pipeline unit, it is necessary to calculate the equivalent water flowrate (Q E ) based on the anticipated actual flow (see Step 1). The Table below is used to select the appropriate unit (steam only). D E D E
m 500 m 500
Q E = Q E =
D L D L
Step 1. Determine equivalent water flowrate (Q E ) in U.S. GPM:
D E D L D E D L
Q E = Q L Q E = Q L
m 500 500
D E D L D E D L
P F P S P F P S
T F T S T F T S
Q E = Q E =
Q E = D x Q E = D x
x x
Liquids
or
Gases
or
D E D L D L D E
Q E = Q L Q E = Q L
P F P S P F P S
T F T S T F T S
Q E = (0.948) x Q G Q E = (0.948) x Q G
D x D x
x x
m 500
D E D L
Q E =
P F P S P S P F
T F T S T F T S
Q E
= equivalent flow rate of water at 70 °F (U.S. GPM)
Q E = D x
x x
Q E = (0.0158) x m v Q E = (0.0158) x m v = Equivalent water flowrate (litres / min) m = maximum flow rate of service liquid (lb/hr) D = gas density at 14.7 psi a, 520 °R (60 °F) (lb/ft 3 ) P F = flowing pressure of gas (psi a) P S = standard atmospheric pressure (14.7 psi a) T S = standard absolute temperature (520 °R) T F = flowing temperature of gas (°R = °F + 460) Q G = maximum flow rate of gas (SCFM) Q E
Q E
Q E = (0.948) x Q G Q E = (0.948) x Q G m = maximum flow rate of service liquid (lb/hr) D E = density of water at calibration (62.305 lb/ft 3 ) D L = density of service liquid (lb/ft 3 ) Q L = maximum flow rate of service liquid (U.S. GPM) D x D x x x D E D L Q E = Q L
P F P S P F P S
T F T S T F T S
P F P S
T F T S
Q E = D x
x
Q E = (0.0158) x m v Q E = (0.0158) x m v
P F P S
T F T S
Q E = (0.948) x Q G
D x
x
Steam Q E =
Q E = (0.0158) x m v
Q E
= water equivalent flow rate at 70 °F (U.S. GPM)
m = maximum flow rate of steam (lb/hr) v = specific volume of steam at normal pressure and temperature (ft 3 /lb)
TI-P337-05 EMM Issue 18
Page 6 of 8
ILVA Flowmeter
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