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Chemical Availability Calculation

Chemical Availability Calculation

Chemical Availability Calculation

Hi everybody

A quick question about calculating the chemical availability. How would you know that you are pumping the required dosage for a pump that is not connected to the DCS?
The only way I can think of is to do the pump performance test (1-min test) every day. Or, less preferably to me, do a chemical residual test every day.
Any other ideas?


RE: Chemical Availability Calculation

Are you in the right forum?

"Everyone is entitled to their own opinions, but they are not entitled to their own facts."

RE: Chemical Availability Calculation

@ironic_metallurgist: yes I am. My question is about corrosion inhibitor availability.

RE: Chemical Availability Calculation

Chemical metering pumps or dosing pumps are used for your type of application. These are generally diaphragm pumps that deliver a manually adjustable, but very consistent, volume per stroke. Counting strokes gives total volume.

RE: Chemical Availability Calculation

measure level decrease in the feed container.. if the level decrease is large enough to be confidently measured..

RE: Chemical Availability Calculation

Are there no flow meters in the injection lines? Online chemical monitoring with LuxAssure?

Steve Jones
Corrosion Management Consultant


All answers are personal opinions only and are in no way connected with any employer.

RE: Chemical Availability Calculation

Flow meters are defective/do not exist. And no LuxAssure - might be a good technique indeed!

RE: Chemical Availability Calculation

Dear ARajab,

Check the chemical content (corrosion inhibitor, say phosphate) in the day tank once every shift (8 hours). The result over a few days would allow you to reach at the required quantity of the inhibitor that is needed for the system.




RE: Chemical Availability Calculation

Are regular samples taken of the process fluid to track chemistry? I would expect, if nothing else, your samples would readily indicate if your pump was degraded or malfunctioning. Also agreed with tracking chemical volume in the feed container - which I also assume takes place so that you know when to swap it out or refill it.

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