Rothengarans'double-wall spiral corrugated PE pipes are produced in two ways: spiral and spiral corrugated,from high density of (HDPE) polyethylene materials.The spiral body pipes is flat and the spiral corrugated body pipes is folding alike corrugated pipes. in these pipes,the inner layer is used to videograph with light colorful materials. The outer layer always is used as black color. Double-wall spiral pipes or corrugated pipes are produced lighter than PE pipes in terms of technical specifications. corrugated pipes or spiral pipes can be used in cases fluids through at low pressure.spiral PE pipes are used for transfer fluids (sewage and industrial wastewater) -air transport in soil- accumulating surface water and drainage.spiral corrugated pipes are usually produced and made with huge sizes and annular resistance is a function of the tube wall.wall designing has been rectangular sections or ring-shaped,which increases annular resistance.connection methods of two pipe ends from extruder welding, two ends of the pipe are connected with PE melting materials. electrofusion is the other methods of connecting two ends of the pipe,which are textured with Nickel and Chrome wire and electricity melts them, then they are connected together.