British Standard 5345 and its derivatives don't specify. These standards are only concerned with the safety of electrical equipment in potentially hazardous atmospheres. As the conduit isn't part of the electrical circuit, it doesn't matter.

http://www.acronymfinder.com/RSC.html

http://www.acronymfinder.com/ESC.html

If in doubt, consult an appropriately-qualified electrical designer.

Oooops! http://www.acronymfinder.com/EMT.html

EMT (electrical metallic tubing) definitely not, but what is RSC? I'm not sure that IMT (intermediate metallic tubing) is acceptable, either. The usual standard is rigid conduit (which RSC might mean), with watertight fittings. (And internally sealed in locations where flammable fluids might be present.)

What is going into the conduit?

Wire for sure, and maybe fuel vapor?

Then this is going to be another one of those threads that runs and runs, as the forum tries to change the ways of the original poster....

Why oh why isn't it in the electrical section, though?

Is there a qualified electrical designer involved with this project?

If "RSC" is rigid steel conduit, that is what you must use. Remember to pull at least 5 full threads on all joints. All boxes and conduit bodies must also be rated for the environment. Remember your (poured) seal-offs when leaving the area with your conduit runs.

Thanks guys,

Wires will be pulled through (hence the conduit) and yes it will have rated boxes, seals, sealants and stuffing to keep any sparks or ignition potential contained within the conduits, housing, pull boxes and what-have-you. As well as keep vapors and combustible dust particles out.

Thanks for the heads up on the 5 rounds. Those are the small details that can make or break a design. Very grateful for the input sir.

RSC I do believe refers to rigid steel, or at least that's what I was led to believe.

-end of thread-

Cheers,

1Ton... disregard for public safety!

hello tan, i suggest that you need to use EMT pipe this ticker pipe and also stronger than rst, and EMT is always considerd use in oil refinery in all industry i think and depent on the requirement on the construction.