Flow Measurement & Control
5 Park Lake Road, Unit 6
Sparta, NJ 07871 USA
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|Kinematic Viscosity||Stokes, Centi-Stokes, mm2/s||St, cSt, mm2/s|
|Dynamic Viscosity||Pascal Seconds, Millipascal 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|
|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.
|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