Filter Sizing

Pressure drop determines filter size

Filter Sizing t Pressure drop depends on:  Filter Housing  Media Grade  Fluid 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 valve 3 = 16.7 psid

Sizing Example t Fluid: Exxon Teresstic 32 t Flow: 40 gpm t Pressure: 800 psi t Filtration Specification: B 6 =200 t Operating Temperature: 70 o F to120 o F t Bypass Valve: 50 psid t Ports: 1 1/2” t Full filtration required at the most extreme conditions

Step 1 t Determine Viscosity Range

Exxon Teresstic 32 Specifications Data from Exxon handbook: o F o F Results from chart: 70 o F = 400 SUS 120 o F = 110 SUS

Step 2 t Determine viscosity range t Select housing series based on system pressure, mounting, options

Step 3 t Determine viscosity range t Select housing series based on system pressure, mounting, options t Select media grade to match B 6 = 200

Step 3

Step 4 t Determine viscosity range t Select housing series based on system pressure, mounting, options t Select media grade to match B 6 = 200 t 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 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 psid 6(400/150) = 16.0 Housing = 3.5 psid Total = 19.3 psid

80CN-2

Step 4 80CN-2 05Q (150 SUS) Element = 3.0 psid Housing = 1.5 psid Total = 4.5 psid 80CN-2 05Q (400 SUS) Element = 8 psid 3.0(400/150) = 8 Housing = 1.5 psid Total = 9.5 psid

Filter Sizing