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Intermittent Increased Flow from Diapghram Pump

Intermittent Increased Flow from Diapghram Pump

Intermittent Increased Flow from Diapghram Pump

(OP)
We have a diaphragm metering pump designed to pump around 80L/hr.  We are pumping nitric acid.  The nitric acid is in a 5000L tank standing about 3m.  The pump sits about 1m from the base of the bund.  The pump has 1/2" inlet and outlet, but it is connected by 10mm pipe to the process inlet line where the nitric acid is mixed with the process liquor by an in-line mixer.  

We observed the pump operates most of the time at around 80-90L/hr.  However, we have observed some batches where the pump has been injecting at approximately double the flow rate i.e. 160-200L/hr.  

Even when we operate in normal conditions the pump has a slight metalic sound.  We have replaced the pump with a similar model and observed the same characteristics.

We adjusted the stroke length to a fixed position to ensure consistent injection.  

The recirculation line where the nitric injects into is at approximately 2.5 Bar.

The pump is a lewa ecodos metering pump.

Any ideas?

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