ERW welded pipes esed for the transportation of oil, gas, water, and piling & construction. 100% UT, 100% hydraulic ... Guolian Pipe Industry Group Co., Ltd. is a big manufacturer of ERW & SSAW pipes. It has 11 SSAW production lines and ... ,000 metric tons. It is used to be a manufacturer of pipe production facilities, and it has a creative team, so ...