Explosion proof Sealing compound

[Fordean]

Should you seal Rigid pipe threads with compound. I believe you should. Any answers please. Compound type would help. Is it the same as the Chico and compound? Cut Rethreads should they be repainted as well.? This is indoors.

 

[nhee2]

seal for what?

 

[oldsparky52]

Seal with what? X-proof compound? No.

 

[Dsg319]

Should you seal Rigid pipe threads with compound. I believe you should. Any answers please. Compound type would help. Is it the same as the Chico and compound? Cut Rethreads should they be repainted as well.? This is indoors.

I’m not exactly sure what you mean by seal the pipe threads. But by doing so you take away the continuity of the conduit system,and the escape path for gasses under the event of an explosion.

We always you stl8 which is like a grease that does not hinder continuity. Nor does it “seal” But from what I’ve researched and heard is you never wanna use pipe tape or anything like that in conduits and fittings. Because the tapered threads are essentially a path for hot gases to cool down before reaching outside, in the event of explosion in the conduit. I could be wrong if so somebody correct me.

 

[tom baker]

You are correct the threads allow the gas to cool.

 

[Dsg319]

I’m not exactly sure what you mean by seal the pipe threads. But by doing so you take away the continuity of the conduit system,and the escape path for gasses under the event of an explosion.

We always you stl8 which is like a grease that does not hinder continuity. Nor does it “seal” But from what I’ve researched and heard is you never wanna use pipe tape or anything like that in conduits and fittings. Because the tapered threads are essentially a path for hot gases to cool down before reaching outside, in the event of explosion in the conduit. I could be wrong if so somebody correct me.

 

[rbalex]

The main text of section 500.8(E) outlines proper "threading" in hazardous locations. It must not hinder continuity since even a slight current arc, whether fault induced or circulating from harmonics could cause an ignition. This is a problem even in Division 2 since harmonic currents could be continuous. Also "plugging" a thread with compound could affect the pressure relief effect at a thread during an internal ignition.

It should also be recognized that corrosion protection coatings, while desirable, does have a specific exception at threaded joints in section 300.(A). Basically, a properly torqued thread is sufficient.

 

[Fordean]

I’m not exactly sure what you mean by seal the pipe threads. But by doing so you take away the continuity of the conduit system,and the escape path for gasses under the event of an explosion.

We always you stl8 which is like a grease that does not hinder continuity. Nor does it “seal” But from what I’ve researched and heard is you never wanna use pipe tape or anything like that in conduits and fittings. Because the tapered threads are essentially a path for hot gases to cool down before reaching outside, in the event of explosion in the conduit. I could be wrong if so somebody correct me.

I figured the continuity would be Impeded That is why I doubled checked. Thank you

 

[Fordean]

The main text of section 500.8(E) outlines proper "threading" in hazardous locations. It must not hinder continuity since even a slight current arc, whether fault induced or circulating from harmonics could cause an ignition. This is a problem even in Division 2 since harmonic currents could be continuous. Also "plugging" a thread with compound could affect the pressure relief effect at a thread during an internal ignition.

It should also be recognized that corrosion protection coatings, while desirable, does have a specific exception at threaded joints in section 300.(A). Basically, a properly torqued thread is sufficient.

Thank you always double checking before installs. No matter how long you do electric. I usually go over installs with inspectors as well.

 

[Fordean]

Thank You

 

[Fordean]

Exactly what i was looking for. Where was this?

 

[Fordean]

Exactly what i was looking for. Where was this?

Thank you

 

[Bluegrass Boy]

We did a explosion proof job at a rubber plant owned by Michelin. Seal offs at every building, and we did use a compound on the threads. I don’t remember exactly what it was called, but the brand was “Robroy”. I tried to look it up, and the company has different divisions, and did find a thread compound that was one of theirs, and is conductive. They have other explosion proof stuff as well.
This job was 18 -19 years ago. 2 inch rigid all over the plant. It may have been spec for that job. There were a lot of different chemicals in different areas there. Some highly volatile stuff.

https://assets.usesi.com/product-media/specification-sheets/USESI_203239_specification_sheets.pdf

Robroy Industries PVC-Coated Explosion-Proof Fittings UL 1203 Listed | Robroy Industries

robroy.com

 

[Fordean]

We did a explosion proof job at a rubber plant owned by Michelin. Seal offs at every building, and we did use a compound on the threads. I don’t remember exactly what it was called, but the brand was “Robroy”. I tried to look it up, and the company has different divisions, and did find a thread compound that was one of theirs, and is conductive. They have other explosion proof stuff as well.
This job was 18 -19 years ago. 2 inch rigid all over the plant. It may have been spec for that job. There were a lot of different chemicals in different areas there. Some highly volatile stuff.

https://assets.usesi.com/product-media/specification-sheets/USESI_203239_specification_sheets.pdf

Robroy Industries PVC-Coated Explosion-Proof Fittings UL 1203 Listed | Robroy Industries

robroy.com

Thank You

 

[SSDriver]

Crouse Hinds makes what's called STL and HTL thread lubricants for rigid conduit that offers corrosion resistance and is conductive. However under specifications on their site is is listed for "Locations: Ordinary/Non-Hazardous locations". I assume this is because you do want the threads to allow the gasses to escape and cool.