Chlorine attack

[dbday]

Hi,

I have some water tanks in which the water will have a Chlorine level of between 3 and 4 ppm (3 to 4 mg/litre)

The pressure in the tanks will be between 10 and 40 Bar and they will vary in size from 2 cubic metres to 40 cubic metres.

I have been asked to line the inside of the tank with butyl rubber, but looking at some web-sites it seems to me that the butyl rubber will be attacked by the Chlorine at this level of ppm, and have a short life (I know butyl is ok at lower Cholrine concentrations, say 0.5ppm).

Can anyone suggest an alternative rubber compound that will resist the Chlorine, and not cost the earth ?

Also, we would normally use a level gauge made from stainless steel, but I am uncomfortable with stainless steel at this chlorine concentration for the pressure the tanks are to work at - am I right to be worried ?

Thanks for any help.

 

[Duwe6]

Your concentration is less than typical potable city water. The stainless will be fine for decades, assuming that the temp stays below boiling.

Have you looked at using, instead of a rubber lining, an internal coating of epoxy, i.e. 'Plascite'?

 

[micalbrch]

Epoxy coating will work well. Natural rubber coating is another alternative.

Don't worry about a stainless steel pressure gauge. As Duwe6 wrote, the chlorine concentration is less than in typical potable water.

 

[MJCronin]

I agree with the above two comments....your chloride levels are extremely modest.

There are many proven epoxy coatings that will do well in this service,