Field Bend

[Alwayslearningelec]

Would you ever field bend 4" PVC Coated RGS or always use prefab? Have about 250 bends within multiple sets.

It's all on a roof on ground and not up in air, not sure if that makes difference in determing whether bend or use prefab.

 

[infinity]

Either way will work. I would probably lean towards prefab.

 

[don_resqcapt19]

Yes, factory 90s.
It would probably take special shoes and follow bars to field bend, but that will still likely be a problem for any kicks or offsets that are needed.
If the conduit was smaller, I would probably just use the next larger shoe and follow bar, but with many benders, they stop at 4", so you can't do that.

 

[Alwayslearningelec]

Yes, factory 90s.
It would probably take special shoes and follow bars to field bend, but that will still likely be a problem for any kicks or offsets that are needed.
If the conduit was smaller, I would probably just use the next larger shoe and follow bar, but with many benders, they stop at 4", so you can't do that.

Yes but then don't you then need to cut and thread whihc adds labor?

 

[infinity]

Yes but then don't you then need to cut and thread whihc adds labor?

Correct prefab 90's require more couplings and nipples but they are often less time consuming than bending. Also prefab 90's are easier to spin on.

 

[don_resqcapt19]

Correct prefab 90's require more couplings and nipples but the is often less time consuming than bending. Also prefab 90's are easier to spin on.

Especially with the extra care needed for PVC coated RMC.

 

[don_resqcapt19]

If they have specified PVC coated rigid, what did they specify for the supporting straps and struts?

 

[Alwayslearningelec]

Correct prefab 90's require more couplings and nipples but the is often less time consuming than bending. Also prefab 90's are easier to spin on.

EASIER to spin on??? Than what? You would be field bending otherwise.

 

[don_resqcapt19]

EASIER to spin on??? Than what? You would be field bending otherwise.

A field bend will be much longer on one end than a factor bend would be.

 

[infinity]

EASIER to spin on??? Than what? You would be field bending otherwise

I know we've been down this road before but a prefab 90 is about 32" long on each end. An elbow bent somewhere on 10 foot length of pipe is 10' of weight that you have to try and spin on instead of maybe 48" of pipe.

 

[Alwayslearningelec]

I know we've been down this road before but a prefab 90 is about 32" long on each end. An elbow bent somewhere on 10 foot length of pipe is 10' of weight that you have to try and spin on instead of maybe 48" of pipe.