Filter Sizing

Pressure drop determines filter size

Filter Sizing

Pressure drop depends on:Filter HousingMedia GradeFluid Viscosity

– Temperature– Oil Type

Flow Rate

Filter Sizing

Parker Rule-of-Thumb:

Maximum Element Clean Pressure Loss:

1/3 bypass valve setting, or less

Filter Sizing

50 psid bypass valve3

= 16.7 psid

Sizing Example

Fluid: Exxon Teresstic 32 Flow: 40 gpm Pressure: 800 psi Filtration Specification: B6=200 Operating Temperature: 70oF to120oF Bypass Valve: 50 psid Ports: 1 1/2”

Full filtration required at the most extreme

conditions

Step 1

Determine Viscosity Range

Exxon Teresstic 32 Specifications

Data from Exxon handbook:

166 SUS @ 100oF

44 SUS @ 210oF

Results from chart:

70oF = 400 SUS

120oF = 110 SUS

Step 2

Determine viscosity range Select housing series based on

system pressure, mounting, options

Step 3

Determine viscosity range Select housing series based on

system pressure, mounting, options Select media grade to match B6 = 200

Step 3

Step 4

Determine viscosity range Select housing series based on

system pressure, mounting, options Select media grade to match B6 = 200 Calculate pressure loss

40CN-1

Step 4

40CN-1 05Q (150 SUS) 40CN-1 05Q (400 SUS)

Element = 12 psid Element = 32 psid

12(400/150) = 32

Housing = 3.5 psid Housing = 3.5 psid

Total = 15.5 psid Total = 35.5 psid

40CN-2

Step 4

40CN-2 05Q (150 SUS)

Element = 6 psid

Housing = 3.5 psid

Total = 9.5 psid

40CN-2 05Q (400 SUS)

Element = 16.0 psid6(400/150) = 16.0

Housing = 3.5 psid

Total = 19.3 psid

80CN-2

Step 4

80CN-2 05Q (150 SUS)

Element = 3.0 psidHousing = 1.5 psid

Total = 4.5 psid

80CN-2 05Q (400 SUS)

Element = 8 psid3.0(400/150) = 8

Housing = 1.5 psid

Total = 9.5 psid

Filter Sizing