1.1 This specification covers requirements and test methods for 1/2- through 14-in. multilayer polyethylene-polyamide (PE-PA) pipe, which is a two-layer pipe (PE pipe layer bonded to an inner layer of PA). The multilayer pipe covered by this specification is intended for use in piping applications where the permeation and chemical resistance of polyamide (PA) compounds may be useful to protect the PE pipe layer, depending on the type of PA used. Note that this protection from the PA layer only delays the effect of the liquid hydrocarbons; therefore, the same chemical design factor for the multilayer pipe should be used as if the pipe were PE only. Some of these applications may include oil- and gas-producing applications that convey fluids such as oil, dry or wet gas, and multiphase fluids. The design pressure for this multilayer pipe is based on the HDB and wall thickness of the PE compound only; there is no contribution from the PA layer. 1.2 Only electrofusion joints have been used for this multilayer pipe. 1.3 Unless specified otherwise, all the pipe requirements in this specification are for the multilayer pipe. 1.4 The PA layer is not taken into consideration for the design pressure of multilayer pipe meeting this specification. Design pressure rating is determined from the PE pipe layer alone--see Appendix X1. 1.5 Units--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. 1.6 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in figures and tables) shall not be considered as requirements of the standard. 1.7 The following precautionary caveat pertains only to the test method portion, Section 6, of this specification. 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.
polyethylene; PE 4710; coextruded; multilayer; gas distribution
The title and scope are in draft form and are under development within this ASTM Committee.
Citing ASTM Standards
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