Pipeline ancillaries Strainers and filters
10
Capacity correction factors for steam pressure A minimum of 1 bar g positive pressure must be available Steam pressure
barg 1 2 3 4 5 6 7 8 9 101112131414.8
Correction factor
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5 5.5 6 6.5 7 7.5 7.9
Element size correction factors for filter element DN8 DN10 DN15 DN20
DN25
DN32
DN40
DN50L
Size of unit
¼ "
½ "
¾ "
1 ¼ "
1 ½ "
"
1"
2"L
Capacity correction factor
0.08
0.13
0.17
0.25
0.39
0.50
0.67
1.00
DN50H DN65
DN80L DN80H DN100L DN100H DN150L
Size of unit
2 ½ "
2"H
3"L
3"H
4"L
4"H
6"
Capacity correction factor
1.50
2.00
2.70
4.00
6.00
8.00
10.67
Selection example Select a steam filter for a flowrate of 850 kg/h with saturated steam pressure at 4 bar g. A 5 micron rating is required with maximum 0.05 bar pressure drop allowed. Step 1: Divide the flowrate required by the capacity correction factor for the operating steam pressure. In this case, 850 kg/h is divided by 2.5 for a flowrate value of 340. Step 2: From the capacity graph, select the micron rating required. Note where this line intersects the maximum pressure drop and go horizontally to read off the flowrate. In this case, the 5 micron line meets the 0.05 bar pressure drop allowed at a flowrate of 100. Note: For higher pressure drops when selecting a 25 micron filter element, use the flowrate lookup table above. Step 3: Divide the equivalent flow calculated in step (1) by the maximum flowrate in step (2). Hence in this example, we have 340/100 = 3.4 factor. Step 4: From the element size correction factor table, select the nearest suitable conversion factor obtained in step (3) and select the appropriate element size. In the example DN80H CSF16 and CSF16T has a factor of 4.00. Note that if pressure drop must be minimized, always select the element based on a higher correction factor than that calculated.
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TI-P180-43 CMGT Issue 5
Page 18 of 21
CSF16 and CSF16T Stainless Steel Steam Filters
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