Pipeline ancillaries

Strainers and filters

7.7.71

Capacities

Saturated steam 1.0 bar g; DN50 CSF16 and CSF16T

Capacity correction factors for steam pressure

Steam pressure bar g

0

1

2

3

Correction factor

0.5

1.0

1.5

2.0

Element size correction factors for filter element

4

2.5

5

3.0

6

7

8

8.6

3.5

4.0

4.5

4.8

0.07 Maximum recommended differential pressure

Differential pressure bar ( x 100 = kPa )

Size of unit

Capacity correction factor

Size of unit

Capacity correction factor

Selection example

DN25

DN32

DN40

DN50L

DN50H

DN8

DN10

DN15

DN20

1⁄4"

"

1⁄2"

3⁄4"

1"

11⁄4"

11⁄2"

2"L

2"H

0.08

0.13

DN65

DN80L

21⁄2"

3"L

2.00

2.70

0.17

0.25

0.39

DN80H

DN100L DN100H

3"H

4"L

4"H

4.00

6.00

8.00

0.50

0.67

DN150L DN150H

6"L

6"H

10.67

16.00

1.00

1.50

DN200L DN200H

8"L

8"H

21.33

26.67

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 an equivalent 340 kg / h flow.

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 maximum

flowrate of 100 kg / h.

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.

Filter element

In steam / gas service, 100% of particles larger than the pore size chosen will be retained by the element. Note that the 1 micron element

has an efficiency of 99.7% based on 0.2 micron particles. Selecting a pore size smaller than required will result in reduced service life

and higher pressure drop. The CSF16 and CSF16T elements can be cleaned by immersion in dilute hydrochloric acid, ultrasonic bath,

clean water, or air, depending on the type of contamination. However, once the pressure drop across the filter (even after cleaning)

reaches 0.7 bar the element should be replaced. Note: We strongly recommend that a spare filter element set is carried in stock.

TI-P185-01 ST Issue 12

CSF16 and CSF16T Stainless Steel Steam Filters

Page 4 of 6

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