Description

Specifies the series of diameters and the formulae for calculation of the dimensions common to the main types of fittings with spigot ends (socket fittings with curved entries and branches) made of PVC-U.

Scope

This part of ISO 265 specifies the series of diameters and the formulae for calculation of the dimensions common to the main types of fittings with spigot ends, socket fittings, and socket fittings with curved (swept) entries of unplasticized poly(vinyl chloride) (PVC-U) for domestic and industrial waste pipes, regardless of the method of manufacture (with the exception of fittings fabricated from pipes) and of the composition. 

It does not give all the dimensions which are required to manufacture the fittings. These dimensions will be the subject of future International Standards specifying the socket length, spigot length, etc.

It covers types and sizes of fittings and should be used as a guide for manufacturers and users, and as a basis for specific standards. It may later be extended to include other types and sizes of fittings, when increasing use of plastics materials for piping makes this necessary. Extension to include other types of fittings should be made by observing the principles laid down in this part of ISO 265.

The laying lengths (z lengths) given in this part of ISO 265 are intended to assist in the design of moulds, and are not intended to be used for quality control purposes. Note ISO 265-2 will deal with fittings made of other plastics materials.