large diameter welded spiral pipe 1. Grade: Q345B, API X42 - X80, L245, L555, J55, N80 2. Standard: SY/T5037-2000, GB/T Large diameter welded ... ,000kg with several steel strips, wrapped in waterproof paper, PVC sleeve, and sackcloth with several steel strips, Plastic caps or ... mainly used for oil, natural gas, gas, central heating, water supply, sewage treatment, low-pressure fluid delivery and so on. ...