Standard Practice for Estimating the Quality of Extruded Poly (Vinyl Chloride) (PVC) Pipe by the Heat Reversion Technique

Importancia y uso:

2.1 This practice is applicable to distinguish between properly and improperly extruded PVC plastic pipe. It can be used to:

2.1.1 Reveal incomplete exsiccation of compound before or during extrusion (Note 1),

2.1.2 Determine the presence of stress in the pipe wall produced by the extrusion process (Note 2),

2.1.3 Determine whether unfused areas are present, and

2.1.4 Reveal contamination.

Note 1: Residual moisture in the compound vaporizes at extrusion temperatures and is normally evacuated as it forms vapor. Pockets of moisture trapped in the pipe wall result from incomplete exsiccation of the compound, and may reduce the physical properties of the pipe.

Note 2: Minor residual stress in the pipe will not impair field performance and handleability. High-residual stress has no proven effect on performance, but may impair handleability during installation.

Subcomité:

F17.40

Referida por:

F1735-21, F1504-21E01, F1871-24, F0949-25

Volúmen:

08.04

Número ICS:

23.040.20 (Plastic pipes)

Palabras clave:

heat reversion; PVC pipe ;