When we were in Yeravan they were installing gas lines above ground. This man was heating the steel pipe, with an acetylene torch, making the bends necessary. What a good idea, what saving in fittings.
The pipe in the picture is PVC heated with a heat gun.and formed while softened. Different material but the idea is the same. I bend plastic electrical conduit also.
I thought this might be of interest to some and you might be able to use this one day.