ISTEC Corporation, your Flow Measurement and Control Specialist
 

ISTEC CORPORATION
Flow Measurement & Control
5 Park Lake Road, Unit 6
Sparta, NJ 07871 USA
Tel 973-383-9888
Fax 973-383-9088
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Oil Meter Pressure Drop Curves

VISCOSITY INFORMATION    
Kinematic Viscosity Stokes, Centi-Stokes, mm2/s St, cSt, mm2/s
Dynamic Viscosity Pascal Seconds, Mllipascal Seconds Pas, mPa.s
  Poise, Centipoise (outmoded) P, cP
     
Conversion cSt Density = mPa.s  
  Engler Degrees ° E to mPa.s: only use conversion table  
  Saybolt Units to mPa.s: only use conversion table  
  Redwood Units to mPa.s: only use conversion table  
     
Rule-of-thumb 1cSt ➝ 1mm2/s ➝ 1 mPa.s  

Oil Pressure Drop Curves D 4

Oil Pressure Drop Curves D 8

Oil Pressure Drop Curves D 15

Oil Pressure Drop Curves D 20

Oil Pressure Drop Curves D 25

Oil Pressure Drop Curves D 40

Oil Pressure Drop Curves D 50

Example Mineral oil, viscosity 450 mPa.s
VZO 25 mounted on pressure side of pumps
❶ Viscosity curves DN 25
select closest curve
F = 500 mPa.s
❷Assume max. permissible pressure drop = 1 bar
❸ The intersection of curve F with the line corresponding
to 1bar gives a flow rate of 2000 l/h.

 

Oil Meter Fuel Oil Characteristics

 

VISCOSITY DIAGRAMS A=5 mPa.s C=100 mPa.s E=500 mPa.s
  B =50 mPa.s D=200 mPa.s  
For a pressure drop of more than 1 bar, it is recommended to use the next larger meter size.
Maximum permissible pressure drop = 3 bar

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