Please refer to the sketch.
PH in the product tank has to be kept at 9. Caustic needs to inject to product tank regularly. What would be the best point to inject caustic?
Suction side of the circulating tank or the discharge side?
I normally make it at discharge side. Flow always goes to the lower resistance direction. Injecting while circulating.
Recently I saw someone make it at the suction side.
There is another option is to make the injection on the top of the product tank. splash load. this option will have no contamination concern but we need a 11m long vertical pipe.
Making the connection on the pump circulation lines, there has to be a double block bleed valve and a check valve on the caustic discharge line to prevent contamination.
Attached Files
Edited by rikakose, 30 July 2018 - 04:47 AM.