The codes concerning pipebending at home and abroad have been compared and analysed

reasonable determination of the wall thickness for straight pipeline before bending and selection of welding position etc. being expounded in detail

and test assessment of inductive bending and heat treatment after bending with radius of 1.5D

which hadn’t been involved in pipebending codes at home in present

being emphasized

obtaining a conclusion in which the 1.5D long elbows can be replaced by bends with bending radius of 1.5 D

and having been successfully used in engineering practice.