Standard Practice for Butt-Fusion Joining of Crosslinkable Polyethylene (CX-PE) Pipe and Tubing

Importancia y uso:

5.1 The procedures described in Section 8 are intended for butt-fusion joining of CX-PE pipe and tubing, using suitable equipment and appropriate environmental control procedures. Appropriate controls are established on the butt-fusion joining process to ensure that the pipe is suitable for joining, that the operator is properly trained, that adequate apparatus and procedures are used, and that the process is protected from environmental extremes. The controls are established by testing butt-fusion joints, operator skills, the apparatus and the procedures used. When this practice is properly implemented, strong pressure and leak-tight joints are produced. When joints made in accordance with this practice are destructively tested, failures are expected to occur outside the fusion-joined area.

5.1.1 This practice shall not be used to join PEX pipe or tubing made in accordance with Specification F876 or any other PEX pipe or system specification. This practice is not intended to be used for pipe or tubing to be crosslinked by radiation or by using peroxides. This practice shall not be used to join CX-PE pipe that has been commissioned. CX-PE pipe that has been commissioned is crosslinked pipe.

5.2 Melt characteristics, average molecular weight and molecular weight distribution are influential factors in establishing suitable fusion parameters, therefore, consider the manufacturers instructions in the use or development of a specific fusion procedure.

5.3 The butt fusion procedures in this practice are suitable for joining CX-PE pipe and tubing that is used in pressure, low pressure, and non-pressure applications. For some applications, qualification of the procedure by testing joints made using the procedure in accordance with regulations from the authority having jurisdiction are required.

5.4 This butt-fusion joining practice shall only be used to join pipe or tubing made from compatible CX-PE compounds and meeting the same specification dimensions for outside diameter and wall.

Subcomité:

F17.20

Referida por:

F0412-24, F3378_F3378M-22, F3525_F3525M-21

Volúmen:

08.05

Número ICS:

25.160.40 (Welded joints and welds)

Palabras clave:

butt fusion; crosslinkable; CX-PE; heat fusion; joining; PEX; pipe; polyethylene;