... 4.Cheap price 5. At least 50 years of life Specification: 20 25 32 40 50 63 75 Feature:1. Superior ... strength is better than the metal pipe, the service life is four times of the steel tube when conveying ore ... fast installation, economic, disassemble, maintenancebut pressure drainage, aging resistance, long life, general and simple, reliable, connected not anticorrosive processing, construction speed ...