Flanged Pipes

Beside the standard pipes and fittings, customers usually need a non standard pipes (flanged pipes) to satisfy some special requirements, this short pieces could be manufactured according to the special designs that may be requested by the customer.

Four types of flanges are provided, corresponding to the nominal pressure PN 10, PN 16, PN 25 and PN 40, and these can be connected to pipes in a fixed or removable way. The later arrangement has the advantage of making casting mounting and PN change easier.

- For short lengths flanged pipes, it could be manufactured with integral flanges or welded flanges.

- For long lengths flanged pipes, it should be manufactured with screwed flanges or with welded flanges (welding neck flanges or slip on flanges for welding.

The wall thickness e has been calculated as a function of the nominal size DN using the linear formula e = K (0.5 + 0.001 DN)

Where:
K = 12 and 14 for pipes with integral flanges;
K = 10 and 12 for pipes with screwed flanges;
K = 9 for pipes with welded flanges (welding neck
flanges or slip-on flanges or welding).

As for spigot and socket pipes, the wall thickness for small diameter pipes is calculated using a complementary formula;

e = 5.8 + 0.003 DN (with a minimum value of 6 mm)

Which is applicable to DN 40 to DN 200 for pipes of class K = 9 and DN 40 to DN 125 for pipes of class K = 10.