RMC Couplings

[Alwayslearningelec]

Seems like when running RGS etc. not many copiling would be required. I know each stick comes with one but I'm trying to think about a COMMON situation within a run where a coupling( that's not part of the conduit) would be needed.

 

[don_resqcapt19]

Depends on the runs....the more bends, the more couplings you need. For my industrial work, I would be looking at about 1.25 couplings per length of conduit.

 

[infinity]

Manufactured elbows require multiple additional couplings. Anywhere you need to cut nipples you may also need additional couplings.

 

[LarryFine]

Seems like when running RGS etc. not many copiling would be required. I know each stick comes with one but I'm trying to think about a COMMON situation within a run where a coupling( that's not part of the conduit) would be needed.

Well, do you have a box of leftovers, or do you find yourself needing to buy extras?

 

[Eddie702]

factory elbows require 2 couplings. If you do field bends you may not be able to turn a bent length into the straight run so you would need 1 additional coupling.

It depends if it is a lot of straight pipe or a lot of bending too. You should buy a few Ericksons to have on the job.

 

[augie47]

factory elbows require 2 couplings. If you do field bends you may not be able to turn a bent length into the straight run so you would need 1 additional coupling.

It depends if it is a lot of straight pipe or a lot of bending too. You should buy a few Ericksons to have on the job.

At $1,300 each... not too many ericksons I hope

 

[infinity]

At $1,300 each... not too many ericksons I hope

I prefer split couplings on RMC. Erickson type (3 peice) couplings are terrible to install. For one they never thread on all of the way unless you deep cut a field thread. I really dislike them and then there's always the ridiculous price.

 

[Alwayslearningelec]

Well, do you have a box of leftovers, or do you find yourself needing to buy extras?

No leftovers

 

[roger]

I prefer split couplings on RMC.

Times 2

 

[Alwayslearningelec]

I prefer split couplings on RMC. Erickson type (3 peice) couplings are terrible to install. For one they never thread on all of the way unless you deep cut a field thread. I really dislike them and then there's always the ridiculous price.

What's the difference between a split coupling and a regular coupling?

 

[infinity]

What's the difference between a split coupling and a regular coupling?

It is internally threaded and split lengthwise. It has two bolts that tighten the coupling around the threads on the conduit.

 

[Alwayslearningelec]

It is internally threaded and split lengthwise. It has two bolts that tighten the coupling around the threads on the conduit.

Why use those over traditional?

 

[don_resqcapt19]

Why use those over traditional?

Much quicker and easier to install, especially when working with larger conduits.

 

[infinity]

Why use those over traditional?

As Don stated they're easier. Slide over and tighten with an impact gun. And they don't have the threading issues that Erikson's have.

 

[LarryFine]

No leftovers

Then that answers your original question. Every joint increases coupling count; nothing decreases it.

 

[LarryFine]

At $1,300 each... not too many ericksons I hope

You should only need one per run, if you plan well.

For example, see:

4" RGS Elbow

From your experience what would take longer? to bend a 4" 90° or use an elbow pre-manufactured? Thank you

forums.mikeholt.com

 

[Alwayslearningelec]

You should only need one per run, if you plan well.

For example, see:

4" RGS Elbow

From your experience what would take longer? to bend a 4" 90° or use an elbow pre-manufactured? Thank you

forums.mikeholt.com

If you field bend you'd obviously need less couplings correct?

 

[Alwayslearningelec]

So I'd like to estimate as close to actual as possible. My assembly lets me choose prefab or field bend elbows. There should be a guideline for when bends would happen over prefab elbow and vice versa.

 

[LarryFine]

If you field bend you'd obviously need less couplings correct?

All other things being equal, absolutely.

 

[LarryFine]

So I'd like to estimate as close to actual as possible. My assembly lets me choose prefab or field bend elbows. There should be a guideline for when bends would happen over prefab elbow and vice versa.

If your layout is that complicated, perhaps a 3D drawing like a plumbing diagram would help.