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J) Pressure Loss
The pressure drop is the difference between of the inlet and outlet pressure of the flow meter
while operating. When measuring a liquid, the pressure drop will increase as the flow rate
increases. When the metering system has accessories such as an air eliminator or valve,
these items will be approximately the same pressure drop through equivalent size meter.
PRESSURE DROP CURVE
32 SSU SOLVENT
0
0.5
1
1.5
2
2.5
3
0 10 20 30 40 50 60 70 80 90 100
EXAMPLE:
A 700-20SP flow meter, air eliminator, strainer and preset valve. Operating at 80 GPM on a
2000 SSU lubricating oil.
Flow Meter: 1.5 PSI x 4.0 = 6 PSI Pressure Loss
Air Eliminator/Strainer: 1.5 PSI x 4.0 = 6 PSI Pressure Loss
Preset Valve: 1.5 PSI x 4.0 = 6 PSI Pressure Loss
Total Pressure Loss is 18 PSI
VISCOSITY CONVERSION
(Specific Gravity = 1)
Centistokes x Specific Gravity