:: TERRAIN SDP :: tuberias pb y pvc

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PVC-U

5. Once the pipe is inserted in the piece, there will be a time called hold time in table 1. That time is counted from when the pipe has been fully fitted, until the weld is considered consolidated. This is done by holding slight axial pressure on it, similar to that used to place the pipe in the piece, for the time stated in table 1 to avoid the tendency the pipe has of coming out
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6. Cooling time is the time counted from completing a heat-welded joint (without including the hold time) until starting the next weld on the same piece or pipe worked on, indicated in table 1.
This must be allowed for before performing another weld between the present one and other components
During this heat-welding process, maximum care must be taken in order to fit the pipe in proper alignment with the piece to be joined. The pipes will be cut perpendicular to their axis and these will be free of burrs or cutting waste.
The surfaces to be welded must be cleaned on the pipe as well as the piece using lint-free absorbent paper, slightly dampened with ethyl alcohol (for example, technical alcohol 94%) free of grease and oil

Pipes of diameter 16 and 20 mm. need not be edged or bevelled. For pipes of diameters 25.32 and 40 mm., it is advisable to bevel them. For pipes of diameter 50 and 63 mm., bevelling is essential.

After 1 hour from the last weld, the installation is ready for hydraulic testing, according to the applicable regulations and standards.

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