Flowmetering Gilflo and ILVA flowmeters 3
Sizing the ILVA for saturated steam - kg/h Minimum and maximum flowrates in kg/h at different pressures (bar g) Note : Maximum steam flowrates are calculated at maximum differential pressure.
Steam pressure bar g
Size
1
3
5
7
10
12
15
20
25
30
40
Maximum Minimum Maximum Minimum Maximum Minimum Maximum Minimum Maximum Minimum
307 3
427 4
517 5
594 6
693 7
752 8
832 8
952 10
1 060 11 4 163 42 8 540 85
1 160 12 4 554 46 9 341 93
1 341 13 5 265 53
DN50
1 206 12 2 475 25 5 981 60 11 756 118
1 675 17 3 435 34 8 301 83 16 317 163
2 032 20 4 167 42
2 332 23 4 784 48
2 721 27 5 581 56
2 951 30 6 054 61
3 268 33 6 703 67
3 740 37 7 671 77
DN80
10 800 108 26 101 261 51 301 513
DN100
10 071 101 19 796 198
11 562 116 22 726 227
13 487 135 26 509 265
14 631 146 28 757 288
16 119 162 31 840 318
18 538 185 36 437 364
20 639 206 40 566 406
22 573 226 44 368 444
DN150
DN200
How to order Example: 1 off Spirax Sarco DN150 ILVA flowmeter for installation between flanges to EN 1092 PN40. Body material 316 stainless steel. Flow medium saturated steam at 10 bar g, maximum flow 8 000 kg / h.
3.2 8
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:-
Mass flow units
Volumetric units
q q
q q m q
q
SG m SG m
SG m m SG m
Q = E Q = E Q = E
Q = E Q = E E
Q = Q SG E L Q = Q SG E L E L E
Q = Q SG E L Q = Q SG E L L
Liquids
1000 Q = q E Q = q E M M 1000 1000 Q = q E M
1000 1000 1000
D D
D
Q = q E Q = q E M Q = q E M M
1000 F 1000 F D 1000 F
1000 F E 1000 F Q = Q Q = Q Q = Q E 1000 F E
Q = Q E Q = Q Q = Q E E
Gases and steam actual flow conditions
D D
D
F F F
F F
D
F F F
F F
F
F
q q M M M q
q q M M
q
Q = E Q = E E
Q = E Q = E E
D S D S P S T F 1 000 P F T S x x 1 000 P F T S x x D S P S T F S P S T F D S Q E = Q S S E = Q S Q E = Q S 1 000 P F T S
P S T F 1 000 P F T S x x 1 000 P F T S x x P S T F P S T F 1 000 P F T S
M
Q E = Q S Q E = Q S F F S E = Q S S
D P T x x 1000 P T S F S S F S D P T x x 1000 P T S S
S D P T x x 1000 P T S S F D P T x x 1000 P T S S S S F
Gases standard conditions
S
F F F
F F
S
S
F
Where: Q E
= Density of gas at standard conditions (kg / m³)
D S
= Equivalent water flowrate (litres / min)
Q = Q E 1 000 P F S S Q = Q E = Q S Q = Q E 1 000 P F S E = Q S E 1 000 P F Q E = Q S D S D S Q
P S P S x x P x x
S Q = Q 1 000 P F E T F T F D S P S Q = Q S S Q = Q P S 1 000 P F x D S
D P P x 1000 P T 1.29 1.013 293 x S x S P S S x x 1000 8.013 273 x 1000 8.013 273 x 1000 8.013 273 F F F F T F D P P S S F F S T F T S T S E T S E x x T F T S T S x x S x x x T F T S 1.29 1.013 293 x 1000 P T 1.29 1.013 293 x
E = Q S E = Q S E = Q S D F
= Density of gas at actual flow conditions (kg /m³)
S S x 1000 P T 1.29 1.013 293 D P P D P P x 1000 P T 1.29 1.013 293 x x 1000 8.013 273 1.29 1.013 293 x x 1000 8.013 273 x x 1000 8.013 273 F F F F F F x
q m Q L
= Mass flowrate (kg / min)
Q Q
S 1 000 P F
S S S S S S = Standard pressure: 1.013 bar a, 1.033 kg/cm 2 a, 14.70 psi a S S S S
= Maximum liquid flowrate (litres / min)
P S
Q E = 110 litres /min E = 110 litres /min Q =(500 x 16.667) x Q =(500 x 16.667) x Q =(500 x 16.667) x E E E Q E = 110 litres /min
Q E = 110 litres /min E = 110 litres /min Q =(500 x 16.667) x Q =(500 x 16.667) x E Q =(500 x 16.667) x E x x E Q E = 110 litres /min
= Maximum gas flowrate at standard conditions (litres / min) = Maximum gas flowrate at actual flow conditions (litres / min)
Q S
P F T S T F
= Actual flow pressure in same absolute units as P S
= Standard temperature (K) = °C + 273
Q F
= Actual flow temperature (K) = °C + 273
SG = Specific gravity
TI-P337-05 EMM Issue 18
Page 4 of 8
ILVA Flowmeter
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