Discflo Pump Viscosity Corrections

Since pump performance curves are based on pumping water, you must apply corrections to calculate the change in flow rate or power when handling viscous liquids. The following table show correction factors for pumping homogenous fluids using the Discflo pump.

To calculate the capacity rating of a pump in a viscous application, follow these steps:

Step 1: Calculate the desired flow and desired head for the application.
Step 2: Divide the desired flow and head by the correction factors given in the table above. This will give you the capacity rating of the pump.
Step 3: Use the corrected flow rate and head values on the published curves to determine power requirements.

EXAMPLE 1A: Viscosity Correction (in US units)
Product: molasses         Viscosity: 10,000 cP
Flow rates: 100 GPM     TDH: 100 ft
Corrected flow rate:
Correction factor for 10,000 cP = 1.30
Flow = 100 = 77 GPM
`````````1.30
Corrected head:
Correction factor for 10,000 cP = 1.25
TDH = 100 = 80 ft
``````````1.25
The pump required would be sized for 77 GPM at 80 ft TDH.

EXAMPLE 1B: Viscosity Correction (in metric units)
Product: molasses       Viscosity: 10,000 cP
Flow rates: 50 m3/h     TDH: 50 m
Corrected flow rate:
Correction factor for 10,000 cP = 1.30
Flow = 50 = 38 m3/h
````````1.30
Corrected head:
Correction factor for 10,000 cP = 1.25
TDH = 50 = 40 m
````````1.25
The pump required would be sized for 38 m3/h at 40 m TDH.