Pipeline ancillaries Strainers and filters
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CSF16 and CSF16T air sizing: The correction and sizing tables above are based upon compressed air in Nm 3 /h.
Nm 3 /h refers to the flow at normal conditions. Therefore, the calculated flow rate needs to be quantified before a selection can be made. The sizing scenarios below show how we calculate Nm 3 /h taking into consideration the operating air pressure and temperature and how this deviates from ‘Normal conditions’ which are defined as 1 bar abs and 20 ⁰C. CSF16 and CSF16T air sizing table Please note that the flowrates displayed on the CSF16 and CSF16T air sizing table are based on an air pressure of 7 bar g. DN8 DN10 DN15 DN20 DN25 DN32 DN40 DN50L DN50H DN65 DN80L DN80H Size of unit ¼" " ½" ¾" 1" 1¼" 1½" 2"L 2"H 2½" 3"L 3"H Maximum flowrate Nm 3 /h 60 90 120 180 270 360 480 720 1 080 1 440 1 920 2 880
Capacity correction factors for air pressure Air pressure
barg1 2 3 4 5 6 7 8 9 10111213141516
Correction factor
0.25 0.375 0.5 0.625 0.75 0.875 1.0 1.125 1.25 1.375 1.5 1.625 1.75 1.875 2.0 2.125
Sizing scenario 1: Customer provides flow rate in m 3 /h (room temperature but at a given pressure) Example conditions: - Flowrate of air = 200 m³/h - Air operating pressure = 4 bar (g) - Air operating temperature = 20 ⁰C (ambient) Step 1: Convert m 3 /h to Nm 3 /h Nm 3 /h = Pressure (Abs) x Volumetric Flow (m 3 /h) Nm 3 /h = 5 bar (Abs) x 200 m³/h Nm 3 /h = 1,000
7.6.103
Step 2: Identify the Capacity Correction Factor for a given operating air pressure using the Capacity Correction Factors for air pressure table For 4 bar (g), correction factor is 0.625 Step 3: Divide the calculated Nm 3 /h by the Capacity Correction Factor and select the housing size using the calculated flow value. 1,000 Nm 3 /h/0.625 = Calculated Flow value = 1600 Nm 3 /h Select 3”L (DN80L) with a maximum flow capacity of 1920 Nm 3 /h
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TI-P180-44 CMGT Issue 4
Page 16 of 19
CSF16 and CSF16T Stainless Steel Sterile Air Filters
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