Flowmetering Gilflo and ILVA flowmeters 3
Q = E Sizing (metric) ILVA flowmeter minimum and maximum saturated steam flowrates in kg/h Notes: 1. These capacities are based on a differential pressure across the flowmeter of 498 m bar H 2 0 (200 Inches). 2. Minimum flow is 1% of maximum (100:1 turndown). 3. The table below is a guide only.
q
SG m
q
Q = Q SG E L
SG m
Q = E
Q = Q SG E L
1000
D
Steam pressure bar g
1000 F
Q = q
1000
Q = Q
D 100 F
E M
Size
Q E
E F
D
Q = q
Q = Q
F
E M
E F
D 30
1
3
5
7
10
12
15
20
25
40
F
Max Min Max Min
7 750 78 10 975 110
15 985 160 22 637 226
22 185 222 31 417 314
26 915 269 38 115 381
30 899 309 43 758 438
36 043 433 51 042 510
39 099 391 55 369 554
43 292 433 61 307 613
49 541 495 70 157 702
55 155 552 78 107 781
60 325 603 85 428 854
69 758 698 98 778 988
DN250
D S
D P P x 1000 P T S F F
Q=Q x E S
Q E = Q S
x D S
S S x 1000 P T S F F D P P S S
Q=Q x E S
Q E = Q S
1 000
1 00
DN300
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). Step 1. Determine equivalent water flowrate (Q E ) in l/min:-
3.2 16
Mass flow units
Volumetric units
q q
q q
SG m SG m
SG m SG m
Q = E Q = E
Q = E Q = E
Liquids
Q = Q SG E L Q = Q SG E L
Q = Q SG E L Q = Q SG E L
E
1000 1000
1000 1000
D D 1000 F 1000 F F
D D 1000 F 1000 F F
Q = q Q = q
Q = q Q = q
Q = Q Q = Q
Q = Q Q = Q
E M E M
E M E M
E F E F
E F E F
D D
D D
Gases and steam actual flow conditions
F F F
F F
F
D S D S S P S T F 1 000 P F T S x x Q E = Q S Q E = Q S P S T F 1 000 P F T S x x S F E S
D S D S P S T F 1 000 P F T S x x P S T F 1 000 P F T S x x S S F
D P P x 1000 P T S F F D P P x 1000 P T S F F S S S S E S S
Q E = Q S x 1000 P T S F F D P P D P P S S x 1000 P T S F F Q E = Q S S S E S
Q=Q x E S Q=Q x E S
Q=Q x E S Q=Q x S
Gases standard conditions
F
S
F
S
Where: Q E
= Equivalent water flowrate (litres/min)
D D
Q Q
E = Q S E = Q S
q m Q L
= Mass flowrate (kg/min)
1 1 Q Q
E E E
E
S
= Maximum liquid flowrate (litres/min)
Q =(28000 x 1 Q =(28000 x 1 E Q E Q
E E E
Q S = Maximum gas flowrate at standard conditions (litres/min) Q F = Maximum gas flowrate at actual flow conditions (litres/min) SG = Specific gravity D S = Density of gas at standard conditions (kg/m³) D F = Density of gas at actual flow conditions (kg /m³) P S = Standard pressure: 1.013 bar a, 1.033 kg /cm2 a, 14.70 psi a P F = Actual flow pressure in same absolute units as P S T S = Standard temperature (K) = °C + 273 T F = Actual flow temperature (K) = °C + 273
TI-P337-46 EMM Issue 6
Page 4 of 7
ILVA Flowmeter DN250 and DN300
Powered by FlippingBook