Maintaining a constant radius in bends.

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jddockery

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Here's the conundrum, i have several different size conduits. Lets say three of the conduits are 2" & have a radius of 9.3125" & one pipe is 1". Each conduit is ran in parallel & will be visible, so i want to maintain a constant radius w/ the 1" conduit. The one inch shoe has a radius of 5.75".

The pipe is for arguments sake rigid.

How do i maintain the radius?
 
Smart $

Smart $

Esteemed Member
Location
Ohio
tkb said:
You want to make concentric bends.
You will need to make segment bends on your conduit.

This site can help with you calculations.
http://www.porcupinepress.com/_bending/ConduitBending.htm
Click to expand...
One advantage of rigid (GRC) is that it can generally be bent on a shoe for larger-sized conduit without kinking or excessive ovaling. No need to do segment bending for the OP. Simply bend the 1" using the 2" shoe. Bend a test 90? to determine how much to overbend and the amount to deduct.
 
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peter

Senior Member
Location
San Diego
I don't know if this will help or not, but the Eriksen bender will bend EMT to the same 12" radius for 1/2", 3/4" and 1" tube.
~Peter
 
J

jddockery

Member
Actually saw a co-worker do this, used the 2" inch shoe to bend the 1".........& i was thinking there was some mathematics involved.

Slow bending will reduce ovaling, another suggestion he made was the conduit could be filled with sand & capped to reduce ovaling.

Thanks for the replies.

JD
 
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