... used in transfering oil, gas, water in oil field 3PE coated steel pipe, WITH THREE LAYERS OF POLYETHYLENE (3PE) TO ANTI-CORROSION ... : OUTSIDE DIAMETER FROM 21.3mm to 1220 mm.3PE COATED STEEL PIPE CAN BE WIDELY USED IN GAS OIL CHEMICAL MINE POWER ... COULD BE COATED WITH EPOXY RESIN POWDER THEN DECREASE TRANSPORTATION RESISTANCE.CERTIFICATE: ISO9001, UL, FM, CE, API 3PE coated steel pipe API 5L ...