Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Explosion Proof Gearbox?

Explosion Proof Gearbox?

Explosion Proof Gearbox?

Is there such a thing as an UL explosion proof gearbox? I have heard of UL explosion proof electric motors, but does the gearbox need to be UL rated for explosion proof in such an enviroment. I would think that it would need to be, because meshing metal gears could create a spark.

RE: Explosion Proof Gearbox?

Google "Factory Mutual Gearbox" and it seems that there are a number to choose from.

RE: Explosion Proof Gearbox?


Thanks for the post. What is a Factory Mutual Gearbox anyway? What does that mean?



RE: Explosion Proof Gearbox?

Factory Mutual is an agency that provides guidance and approval for equipment that may be exposed to fire, explosion etc. Typically, if a supplier wants to market an item, such as a gear box, as explosion proof, they will hire Factory Mutual to evaluate the product and approve it.

It's similar to UL Approval.

RE: Explosion Proof Gearbox?

I haven’t heard of explosion proof reducers, though, which does not mean they do not exist.

A RA may dictate you need to use fire resistant fluids (there are disadvantages associated that type of oil). The installations I have seen, utilise standard oil.

Some UG applications use water in fluid couplings in lieu of oil.


RE: Explosion Proof Gearbox?

Gearboxes intended for use in potentialy explosive enviroments do exsist, at least they do here in Europe, Google for "ATEX regulations".
The main concern with gearboxes, pumps and other driven equipment is not so much the possibility of stray sparks generated in use, its the issue of surface temperature under fault conditions. Should the structure bcome excessively hot it may lead to auto-ignition (or flash-over) of the surrounding atmosphere.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close