Flowmetering Gilflo and ILVA flowmeters 3
Step 2. Using the value of Q E as determined in Step 1, select the correct size of the ILVA flowmeter using the Table below. In practice, it will often be the line size that determines the choice of the flowmeter.
Flowmeter type
Max. Q E litres/min
Max. pressure drop Wg
DN250 DN300
7 750
200
00
10 975
200
P S T F P F T S x P S T F 00 P F T S x x
Example: Determine which ILVA pipeline unit is required to measure the flow of compressed air when: 1: Estimated maximum rate of flow = 28 000 s m³/h at 7 bar g and 20 °C. Note : Standard conditions = 1.013 bar a, 0°C giving a standard density of 1.29 kg/m³
D S
P S
T F
Q
E = Q S
2: Calculate Q E from:
F F D P P x 1000 P T x T F x
1 000 P F T S x x S E S Q = Q D S P S Q = Q
Q
E = Q S
S S x 1000 P T F F D P P S S
1 000 P F T S x x S E S
3.2 17
1.29 1.013 293 x 1000 8.013 273
Q =(28000 x 16.667) x
x 1.29 1.013 293 x 1000 8.013 273 x
E
Q =(28000 x 16.667) x
E
Q E = 6 174 litres/min
So a DN250 ILVA is recommended. Note: 1 m³/h = 16.667 litres /min
How to order example 1 off Spirax Sarco DN250 ILVA flowmeter suitable for fitting between EN 1092 PN16 connections.
D S T F 000 P F T S x x S T F 000 P F T S x x S P S E = Q S E = Q S E S E S = Q S E = Q Q D S D S Q D S P S S F S S S
P S P S
T F T F
D P P 1 000 P F T S x x S 1 000 P F T S x x S x Q = Q D P P E S E S F F x Q = Q S F
F F x 1000 P T D P P D P P x 1000 P T S S F F S S x x S
F F x 1000 P T S S S S x 1000 P T S F
F
1.29 1.013 293 x 1000 8.013 273 1.29 1.013 293 x 1000 8.013 273 x x x
1.29 1.013 293 x 1000 8.013 273 1.29 1.013 293 x x 1000 8.013 273
16.667) x =(28000 x 16.667) x 16.667) x =(28000 x 16.667) x Q =(28000 x 16.667) x E E
TI-P337-46 EMM Issue 6
Page 5 of 7
ILVA Flowmeter DN250 and DN300
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