... end socket arc butt welding, and the once-forming of composite steel-plastic technology. Equipped with active and passive ... epoxy ethane, gas, butane, dimethylmethane, propylene, etc. Cross section of tank could be oval, round and round-square. heat insulation ... inspection, advanced equipments, reliant quality and flexible modes of operation. What’s more, it has roundly passed the ISO9001-2000 and ...