Caustic resistant wire and conduit?

[gadfly56]

Conduit by definition is not and does not need to be sealed, except for installing glands. That’s why plumbers use pipe door or anaerobic thread sealants. Robroy SOUNDS good but in practice still not sealed. And rigid right to a motor…maybe but usually not a good idea.

Mild steel is reasonably resistant to high pH. But PVC: have you actually seen what it does to it? It gets extremely brittle. If you are really going down this route PVDF (Kynar) IS highly resistant to bases and is somewhat more expensive and recently approved. The big truck is solvent welding doesn’t work. Like HDPE you heat it with an iron and weld it together. VERY solid connections.

Caustic on metals is a strange animal. It doesn’t so much corrode it like acids as it just sort of dissolves away. This is speaking from experience working at lots of chemical plants and lime plants.

The OP said "caustic" but then he talked about hydrochloric acid, the opposite of caustic.

 

[MattG0311]

Sorry guys, I used caustic interchangeably with corrosive. The chemical in question is hydrochloric acid.

 

[paulengr]

Sorry guys, I used caustic interchangeably with corrosive. The chemical in question is hydrochloric acid.

Completely different.

Any metals are easily corroded. The fumes are a big problem and hard to avoid. 304 SS does “ok” but still corrodes. 316 works much better but you pay a lot for that much chrome. Again Teflon insulation is the best. PVC does so-so. There are some acid resistant elastomeric materials but very little chance you can control gaskets in electrical parts.

I’ve always tried to just assume the cabling is a “consumable” with acids and replace as needed.