Requirement of Throttling for Chemical Injection lines besides Pump Stroke Adjustment
Requirement of Throttling for Chemical Injection lines besides Pump Stroke Adjustment
(OP)
Dear All,
I would like to enquire whether from operational perspective, there is a need to have throttling at the chemical injection point besides knowing that the chemical dosage can be adjusted via the pump stroke. The example I am presenting here is only for a single injection point fed from its dedicated diaphragm pump i.e. no sharing of multiple injection points from the same head.
Thanks
Regards,
I would like to enquire whether from operational perspective, there is a need to have throttling at the chemical injection point besides knowing that the chemical dosage can be adjusted via the pump stroke. The example I am presenting here is only for a single injection point fed from its dedicated diaphragm pump i.e. no sharing of multiple injection points from the same head.
Thanks
Regards,
RE: Requirement of Throttling for Chemical Injection lines besides Pump Stroke Adjustment
The answer is NO ! You adjust the flow with the stroke. Refer to operation manual from vendor and perform a safety hazard analysis to understand the risk associated with a valve at the discharge of the pump .
Good luck
Pierre
RE: Requirement of Throttling for Chemical Injection lines besides Pump Stroke Adjustment
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Requirement of Throttling for Chemical Injection lines besides Pump Stroke Adjustment
Thanks Pierreick, I was wondering why some operation personnel prefer having needle valves near the injection point to tune the dosage, I understand that this can surely lead to frequent operation of the chemical pump in recycle PRV path (if available) or popping of the discharge PSV in case valve is forgotten closed.
RE: Requirement of Throttling for Chemical Injection lines besides Pump Stroke Adjustment
Operations personnel tend not to have knowledge of such things and they see a control valve in other applications where there are centrifugal pumps or a supply line with pressure and assume all systems are the same.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Requirement of Throttling for Chemical Injection lines besides Pump Stroke Adjustment
One does not close a line valve on a running PD pump, which is a constant volumetric flow rate machine. That's rule #1 in PD Pump 101.
Good Luck,
Latexman
RE: Requirement of Throttling for Chemical Injection lines besides Pump Stroke Adjustment
regards,