1.1 This specification covers black, metric-sized crosslinked polyethylene (PEX) pipe with pipe material designation codes of PEX 80, PEX 100, and PEX 125 that is outside diameter controlled in pipe sizes ranging from 16 to 1000 mm, made in pipe dimension ratios ranging from 6 to 17, and pressure rated for water using the ISO MRS method (see Appendix X1). Included are requirements and test methods for material, workmanship, dimensions, burst pressure, hydrostatic sustained pressure, excessive temperature pressure, environmental stress cracking, stabilizer functionality, bent-pipe hydrostatic pressure, oxidative stability in potable chlorinated water, and degree of crosslinking. Requirements for pipe markings are also given. The pipe covered by this specification is intended for pressure-piping applications (such as, industrial and general purpose pipelines, potable water pipelines, hot-and-cold water, and fireextinguishing pipelines). This specification also includes carbon black requirements for PEX pipe so that it can be used for aboveground pressure-piping applications. 1.2 The text of this specification references notes, footnotes, and appendixes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification. 1.3 Except for dimensions, the values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. For dimensions, the values stated in SI units are to be regarded as the standard. The values given in parentheses for pipe sizes are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. NOTE 1-Metric-sized (SI units) pipe should only be joined with corresponding metric-sized fittings. Inch-sized fittings should not be used for metric-sized pipe. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Keywordscrosslinked polyethylene; hydrostatic stress; PEX; PPI; pipe; pressure; MRS
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