1.1 This practice describes procedures for making butt fusion joints with cross-linkable polyethylene (CX-PE) pipe and tubing that are cross-linked less than 30 % at the time of joining. This practice shall not be applied to cross-linked products, especially pipe or tubing manufactured using the peroxide or radiation cross-linking methods. Joints are made by means of butt fusion joining in, but not limited to, a field environment. Other suitable butt fusion joining procedures may be available from various sources including pipe and fitting manufacturers. This practice does not purport to address all possible butt fusion joining procedures or to preclude the use of qualified procedures developed by other parties that have been proved to produce reliable butt fusion joints. 1.2 The parameters and procedures set forth in this practice are applicable to the butt fusion joining of CX-PE pipe and tubing. Consult with the manufacturers of CX-PE pipe or tubing to ensure that they approve of use this procedure for butt fusion joining of their products. This practice applies to butt fusion of both CX-PE pipe and tubing even when tubing is not explicitly mentioned in individual sections of this practice. 1.3 Dimensionally stable CX-PE pipe or tubing with no visible defects is required to produce sound joints when using the joining procedures described in this practice. 1.4 Ability to join pipe using this practice does not imply that the pipe joined is suitable for any intended use. This practice does not purport to address any issues related to the commissioning of a CX-PE system before its use. The intention of this practice is to set forth requirements for the butt fusion of CX-PE pipe and tubing that, when followed, are expected to yield durable joints in the said pipe or tubing. 1.5 Only procedures related to butt fusion joining are covered in this practice. Saddle fusion and socket fusion are not included in this practice; this does not preclude the use of qualified procedures developed by other parties that have been proved to produce reliable saddle or socket heat fusion joints. 1.6 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. 1.7 The text of this practice 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 practice. 1.8 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.
Keywordsbutt fusion; heat fusion; joining; pipe; polyethylene; crosslinkable; PEX; CX-PE
This new practice will establish the procedures to follow to create a butt fusion joint from a new product type to the plastic pipe industry, which is manufactured from a cross-linkable polyethylene formula by combined action of heat and moisture. A pipeline that is easily assembled from the pipping materials through heat fusion should be of great interest to the industry for larger diameter (6 NPS and greater) PEX pipelines where elevated temperature applications are anticipated. Users would include the pipeline construction industry as well as fittings manufacturers.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
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