Bending copper pipe twice

[Londontennistube]

I need to unbend the end of a 15mm copper pipe to send it back under the floor boards. Was going to use a bending bar. Any thoughts

 

[mattylad]

cut it on the straight and add a new piece.

 

[Londontennistube]

I would but I can't access the straight section with a blow torch. It's central heating pipe.

 

[Mottie]

Use plastic.

 

[Londontennistube]

Would you think push fit is safe under floorboards

 

[EddieM]

Would you think push fit is safe under floorboards

Well they're certainly used, personally I wouldn't feel comfortable with them, especially on heating pipes. Unbending the copper though could potentially work harden the copper.

 

[Londontennistube]

How do you harden the copper?

 

[EddieM]

How do you harden the copper?

Work hardening means making the metal harder and more brittle, this happens when you repeatedly bend metals. I'm not aware of any way of reversing this.

 

[Mottie]

Annealing?

 

[Burnerman]

Annealing will definitely soften copper but I don't know how it can be applied here.
Basically the metal is heated red hot (difficult to tell, naturally!) and then quenched in cold water.
John

 

[TimboTwo]

Plastic pipe has been used on heating systems for probably 40 years. I haven't heard of any failure of pipe or fittings.
Copper will corrode through by various means.