Ductile Iron Fittings

In general, ductile iron fittings are of designs similar to those of grey iron fittings and their ends are flanged or preferably, socket.

The greater mechanical strength of ductile iron has made it possible to improve the design of fittings and to reduce their dimensions. This makes easier to lay mains in congested urban areas of large towns, and resets in a reduction in the size of valve chambers, the dimensions of which depend mainly on the space occupied by the fittings.

Flanged socket pieces and straight collars have an internal diameter enlarged sufficiently to allow the adjacent pipes to slide through, facilitating and the longitudinal adjustment of pipeline sections.

The double-socket bends have lengths increasing in proportion to their angle of deviation, their bearing surface on the thrust blocks thus being adjusted to the size of the lateral forces which they exert on these thrust blocks.

The use of reducing flanges and double-flanged tapers has made it possible to simplify the range of flanged-branch tees the use of a combination of these fittings makes it possible to provide users with the greatest number of possibilities with the smallest number of types of castings.

The effect of this arrangement based on market statistics is to reduce stores both at the manufacture’s works and at the customer’s premises and also to make supply easier.

Double-socket tapers, used mainly for a reduction in diameter, have the shortest practicable lengths.

Double-flanged tapers, generally placed between two successive diameters, have a length in proportion to the variation in diameter, each side being sloped at 5 to the centerline, and chosen so as to reduce the pressure loss when the tappers are used to increase the diameter.