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Y-strainer Rresistance Loss Calculation
| ΔP－－resistance loss，Pa |
| λ－－friction coefficient, dimensionless |
| Re－reynolds number，Re=(ω·dn)/u，dimensionless |
| ω－flow speed，m/s |
| ρ－flow density，kg/m |
| μ－power viscosity，kg/m·s |
| u－movement viscosity u=μ/ρ，m/s |
| L－Equivalent straight pipe length, m, pipe strainer access in the following table "category pipe strainer nominal diameter and straight pipe equivalent length relationship" |
| D－internal diameter of category pipe strainer，m |
| dn－Equivalent diameter, m, category pipe strainers take pipe internal diameter "D", tube shell strainers take '4 s / c ' |
| S－Liquid flow area，m |
| C－Liquid Wet perimeter (wet perimeter), C = 2X (cylinder inner diameter + cylinder height) m |
| ξ- 1.1 inlet resistance coefficient, take 1.1 |
| ξ-0.5 outlet resistance coefficient, take 0.5 |
The relationship between Strainer DN and the length of equivalent straight pipe
| DN |
50 |
80 |
100 |
150 |
200 |
| equivalent straight pipe length L
(×10mm) |
25∽30 |
18∽23 |
15∽20 |
22∽38 |
32∽40 |
| DN |
250 |
300 |
350 |
400 |
450 |
| equivalent straight pipe length L
(×10mm) |
27∽43 |
58∽65 |
48∽85 |
60∽95 |
62∽98 |
| 1）For the 'Y-type' and other Pipe Fittings category strainers, calculated by the formula |
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| 2）For the 'tube-shell' type strainer, calculated by the formula |
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