Rationale

Project Scope: The scope of this project is to: • create a new Annex for the determination of PEX Material Designation Codes from requirements transferred from other locations in this standard to the Annex, • revise Referenced Documents section 2 to remove withdrawn or un-needed references, • revise Terminology section 3 to remove incorrect definitions and to move requirements to appropriate locations, • revise Tubing Classification section 4 to take up content from section 3, • revise Materials section 5 to take up content from section 3 and to better explain that the maximum pressure rating is 75 psig, • rewrite the 7.12 Excessive Temperature and Pressure test method for clarity, removing un-needed conditioning • specify that the bent tube test be conducted on only one specimen, to harmonize with F876 • specify that the ESCR test be conducted only at the highest temperature, to harmonize with F876, and • to revise other requirements to work with the above changes. Rationale: The “tubing material designation code” definition in F2929 contains requirements for the user of this standards. It is a bad practice to place requirements within the definitions of terms. In the interest of preserving and clarifying these valuable requirements, the definition would be deleted, and the information contained moved to new Annex A1 that lays out the method for determining PEX Material Designation Codes. This revision follows closely the content of the recently approved revisions to F876 that resulted in a similar Annex A1 being created in that standard. Issues identified during those projects are addressed in this project in a substantially similar way. It is the intention of the task group to harmonize both the technical content and the layout of PEX pipe and tubing standards as much as practically possible for simplicity of use.