... is a most effective conveying method of such medium as water,gas and petrolium, The reliability of pipenlines depends,to the ... pipelines for oil and gas;oil-field drill pipes,water-flooding pipes,city water-pipes,sewage pipelines,reinforcing bars and auto engine ... ,alkali,and salt,and can resist corrsion by underground salty water,sea water and various organic acid produced by microorganism in the soil ...