Ductile iron pipes, fittings, accessories and their joints compatible with plastic (PVC or PE) piping systems, for water applications and for plastic pipeline connections, repair and replacement

ISO 16631:2016 specifies the requirements and test methods applicable to ductile iron pipes, fittings, accessories and their joints with dimensions compatible with plastic (PVC or PE) piping systems:

- to replace or repair existing plastic pipelines;

- to convey water (e.g. for human consumption, raw water, etc.);

- operated with or without pressure;

- installed below or above ground;

- defined according to their external diameter (DN/OD series);

- classified according to pressure (C class).

The pressure class specified in this International Standard is C25. This pressure resistance level will meet or exceed those of plastic pipes. These ductile iron pipes, fittings, accessories and joints can be used along with plastic pipelines, where they are needed (for example, with higher pressure rating sections, higher traffic load, etc.), for the construction of water pipelines.

The dimensions of the products according to this International Standard, in the size range DN/OD 50 to DN/OD 225, are compatible with those of plastic pipes (ISO 1452 2 for PVC and ISO 4427 2 for PE). The spigots of plastic pipes used for water applications can be inserted into sockets of pipes manufactured