What are common issues when using progressive cavity pumps as dosing/metering pumps?
What are common issues when using progressive cavity pumps as dosing/metering pumps?
(OP)
I work in the Biogas field, we pump a lot of slurries (either literally cattle slurry/liquid manure or mixtures of water, slurry with energy crops) in a range up to 14%TS
metering flow via MID is challenging with these organics loads.
Now, one could isntall a revolution counter on the shaft of a progressive cavitiy pump and should, in theory, be able to measure the flow with great precision (for our causes).
The only issue I see would be leakage along the sealing line if operating against high pressure.
I'm trying to understand the possible issues - what am I missing?
metering flow via MID is challenging with these organics loads.
Now, one could isntall a revolution counter on the shaft of a progressive cavitiy pump and should, in theory, be able to measure the flow with great precision (for our causes).
The only issue I see would be leakage along the sealing line if operating against high pressure.
I'm trying to understand the possible issues - what am I missing?





RE: What are common issues when using progressive cavity pumps as dosing/metering pumps?
prognosis: Lead or Lag
RE: What are common issues when using progressive cavity pumps as dosing/metering pumps?
PC pump can not be use for accurate metering purposed if the pressure fluctuates. If you have look at a PC pump performance curve,
the flow rate actually decreases quite significantly with increasing diff.pressure especially toward the end of the diff. pressure capability. Unless you use a high diff. pressure pump for a low pressure application.
RE: What are common issues when using progressive cavity pumps as dosing/metering pumps?
If a competent PC manufacturer is made as fully aware of your particular service as possible, they will be able to define the slip extremely closely; usually within the precision required. They will play with the various combos of rotor and stator materials, and speed, to control slip for your service.
However, per Pennpiper, nothing is more accurate than actual field calibration measurements.
RE: What are common issues when using progressive cavity pumps as dosing/metering pumps?
Pressure should be stable and in the lower range of the working range of the pump, material consistency varies over the year and maybe also over the day.
Thanks for your input, I'll check back when I had a chance to talk to my collegues.
RE: What are common issues when using progressive cavity pumps as dosing/metering pumps?
RE: What are common issues when using progressive cavity pumps as dosing/metering pumps?
RE: What are common issues when using progressive cavity pumps as dosing/metering pumps?
RE: What are common issues when using progressive cavity pumps as dosing/metering pumps?
Best regards
RE: What are common issues when using progressive cavity pumps as dosing/metering pumps?