... produce pipes ourselves 2.OD:219-2420mm,WT:5-30mm,length of pipe:3-18m 3.certificate: API 5L & ISO Carbon Steel ... in china as manufacture, stockiest, distributors, and exporters of pipe fittings products of all sizes and shapes. The TJRK has drawn together ... ,X42,X52,X60,X65,X70applicationAs conveyer pipe in the fields of petroleum , heat, and natural gas, construction pipe, ground piling pipeOutside ...