This specification covers PEX line pipe utilized for the production and transportation of oil@ gas@ and nonpotable water. The piping is intended for use in new construction@ structural@ pressure-rated liner@ line extension@ and repair of both aboveground and buried pipe applications. Specific equipment covered by this specification is listed as follows: a) PEX line pipe; b) fittings. Purpose The purpose of this specification is to provide standards for crosslinked polyethylene (PEX) line pipe suitable for use in conveying oil@ gas@ and nonpotable water in underground@ aboveground@ and reliner applications for the oil and gas producing industries. This specification does not propose to address all of the safety concerns associated with the design@ installation@ or use of products suggested herein. It is the responsibility of the user of the standard to utilize appropriate health and safety considerations. All pipe produced under this standard utilizes pressure-rated materials used in pressurized@ non-pressure@ and negative pressure applications. The technical content of this document provides requirements and guidelines for performance@ design@ materials inspection@ dimensions and tolerances@ marking@ handling@ storing@ and shipping.