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TechTalk about Plain PVC Fittings

Plain PVC pipe fittings are joined by using a solvent cement, which melts a thin film of plastic on the pipe and fitting and then, as the solvent evaporates, forms a strong mechanical seal between the two.

The majority of plain fittings have sockets, into which the plastic pipe is inserted. This makes the construction of plastic pipe systems very straight forward, as long as some simple rules for preparation and assembly are followed:

1. The pipe should be cut square.

2. The end of the pipe should be chamfered using a file, abrasive disc or scraper to an angle somewhere in the region of 25-45 degrees. This is not to make the pipe go into the fitting easier, but ensures that there are no sharp edges that could otherwise scrape off all the cement, ahead of the pipe, as it is pushed in.

3. The pipe should be de-burred internally and externally.

4. The pipe and fitting should be cleaned with the correct solvent cleaner and a clean cloth.

5. The pipe should be marked (ideally using a chinagraph or permanent marker) to the depth of entry.

6. Cement should be applied to the socket first.

7. Cement should be applied to the pipe.

8. The pipe should be pushed straight into the socket without twisting.

9. If the pipe, once fully in, needs turning, this should be done slowly and immediately.