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From time to time, I have a need to put a fairly gentle bend into 25mm PVC conduit. Past attempts to do this using nothing but a bending spring (originally bought for 22mm copper pipe) were not successful. I found that I could do the job if I warmed up the conduit with a heat gun, but have never been totally happy with the results, as the PVC develops obvious ripples at the heating points.

A few days ago, a member of staff at my local WF Senate told me that I shouldn't have to use a heat gun, so I've just tried again. The results were the same as before, i.e. the conduit simply springs back to the straight position after I bend it.

Is there a knack to this bending process or do I just need to put more effort into the bending? Do I perhaps need a better spring or different conduit (I use MK Heavy Duty 25mm round conduit)?
 
There was a thread on this not so long ago. Do a search.
A bloke was using heated sand in the conduit to bend it.
I'll see if I can find it.
 
From time to time, I have a need to put a fairly gentle bend into 25mm PVC conduit. Past attempts to do this using nothing but a bending spring (originally bought for 22mm copper pipe) were not successful. I found that I could do the job if I warmed up the conduit with a heat gun, but have never been totally happy with the results, as the PVC develops obvious ripples at the heating points.

A few days ago, a member of staff at my local WF Senate told me that I shouldn't have to use a heat gun, so I've just tried again. The results were the same as before, i.e. the conduit simply springs back to the straight position after I bend it.

Is there a knack to this bending process or do I just need to put more effort into the bending? Do I perhaps need a better spring or different conduit (I use MK Heavy Duty 25mm round conduit)?
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Use the proper tool for the job, no heat gun required.
 
Knew you'd come to the rescue @Pete999 . Ta mate.

Thought you were going to tag the thread.. :tearsofjoy::tearsofjoy:
 
Use the proper tool for the job, no heat gun required.
I am more than happy to buy a new spring designed for PVC conduit if that is the most likely solution to my problem. My current spring leaves only 0.5mm clearance all round and I wasn't sure if a slightly tighter fitting spring would really make much difference.

Once I get the proper tool, is there any special knack to the bending process?
 
I've looked at the video showing how to bend pipe using hot sand, but I'm guessing that most people manage to do the job using a bending spring.
Never used anything else, except manufactured right angles etc, mainly to comply with the regs on number of bends etc
 
Why would you use a spring designed for 22mm pipe in 25mm conduit?
The internal diameter of my 25mm conduit is actually 21.5mm, so my old spring appeared to be quite a close match and it didn't seem likely to me that a small increase in spring diameter would make a big difference.

I was wrong. A new MK-branded 25mm bending spring, whose diameter is about 1mm wider than my old spring, has solved my problem!

Thanks to everyone for pointing me in the right direction.
 
The right size spring is essential
When you make the bend,apply bending pressure and move the pipe slightly on your knee, the bend is spread along its length slightly rather than at one point
 
Make sure you have all the right bending springs or you only use the right conduit for the bending spring you have, light duty and heavy duty conduit need different springs because of the wall thickness
 

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