Chlorine Atmosphere

[gadfly56]

I have a customer that processes grey water for use in process cooling. This involves treatment with chlorine, among other things. The exhaust fans they had in the treatment building have corroded to unusable. They ventilate the building by opening a man door on each side off the building 24/7/365. Into this mix we have a fire alarm panel that went into a Hoffman box, but since they were ventilating it with the corrosive atmosphere, the components didn't last long. We are relocating the new panel to an enclosure at ground level in a breezeway under the building. Although not a part of the current work, eventually we need to replace the devices. We are going to go with conventional devices hooked up to monitor modules in the environmental cabinet. The EMT for the fire alarm devices in the building is completely wrecked and should be replaced. Does anyone have a recommendation that doesn't involve plastic coated RMC?

 

[don_resqcapt19]

Chlorine + humidity = hydrochloric acid.
They do make stainless steel EMT and fittings but it will be pricey.

In reworking some controls for potable water storage where they added chlorine to the water, I saw that any of the electrical parts that made a little bit of heat were fine, but parts that stayed at room temperature were damaged fairly quickly. We ended up moving the control panels outside like you are doing, but there were still things inside like pressure sensors and push buttons were an issue.