API SPEC 15PX pdf download Specifcation for Crosslinked Polyethylene (PEX) Line Pipe 1 Introduction1.1Purpose The purpose of this specification is to provide standards for crosslinked polyethylene (PEX) line pipe suitable foruse in conveying oil, gas,and nonpotable water in underground, aboveground, and reliner applications for theoil- and gas-producing industries. This specification does not address all of the safety concerns associated with...