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[jdh]

Dear all,

I'm now attached to aan oil&gas company, working on a Electrochlorinator used to generate hypochlorite from seawater to disinfect the water used in the cooling network. The chlorinator is usually on continous dosing with equivalent chlorine concentarion at 2ppm and interminent shock dosing every 8 hours. May need to redesign the unit for increased capacity.

Can i check if anyone knows what is the usual free chlorine residual for interminent shocking and for how long a period of time shock dosing should be applied? I know the free chlorine residual for continous dosing is 0.5ppm, but i have answers ranging from 1ppm to 3 ppm for shock which will make a lot of difference in capacity.

Also, does anyone knows the current chlorine demand of seawater around Singapore and its associated islands? The basis for the original design was 1.5ppm i believe, but that was 25 years ago and i'm not sure if it changes. Will appreciate any advice.

Thanks!