The primary purpose of a Ductile iron coupler water tightness test is to verify leakage under specified pressure and ensure its sealing performance meets operational requirements. This prevents the transported liquid or gas from leaking out of the piping system. This water tightness test not only verifies the sealing properties of the fittings themselves (such as sockets joints, threaded connections, flange gaskets, and welded/welded joints), but also examines the installation quality of the entire piping system. The pressure test reveals the tightness of connections, the firmness and flawlessness of welds/welds, and the correct installation of gaskets.
When tested it, on test apparatus preventing any excessive axial displacement and subjected to the test conditions and hydrostatic pressures given in Table 4, the joints shall exhibit no visible leakage.
Specifies the hydrostatic test pressures for the following test conditions:
a) joint with pipes aligned;
b) joint with pipes deflected to an angle of at least:
- 3° for nominal sizes up to and including DN 200;
- 1°45′ for nominal sizes greater than DN 200;
c) joint subject to a shear force of at least 10 DN in newtons, with pipes aligned.
Post time: Aug-07-2025
