Equipment descriptions and applications: 1 The machine can be used to manufacture the corrugated pipe with the diameter from 25 to 50,65 to 125, 130 to 300 2. The expansion pipes can be widely used in petro-chemical industry,motocars,steel and coal industry etc. Characteristics of the equipment: 1. Simple and convenient operation,stable operation,advanced frequency converter technology,high energy-saving ability and environmental protection; 2 It can be used to produce general,multi cornered and interior cornered expansion pipes.