ISO 3458-2015 pdf free.Plastics piping systems一Mechanical joints between fittings and pressure pipes – Test method for leaktightness under internal pressure.
ISO 3458 specifies the method of test for checking the leak tightness of assembled joints between mechanical fittings and plastic pressure pipes. The test applies regardless of the design and material of the fitting used for jointing plastic pipe.
This test method is not applicable to fusion-welded joints.
2 Principle
The leak tightness of an assembled joint is checked while the joint is subjected to an internal test pressure greater than the nominal pressure for which the pipe is rated with the pieces joined subject to the longitudinal force, induced by the hydrostatic end thrust.
3 Test parameters and requirements
The test parameters of the standard which refers to this teststandard shall be used and the requirements shall be fulfilled. Hone or more parameters are not given in the referring International Standard, the ones given in Annex A shall apply.
The following test parameters should be given by the standard which refers to this test standard:
a) test medium;
b) test pressure (bar or MPa);
c) test duration (h);
d) test temperature (°C);
e) free length (mm),
4 Apparatus
4.1 A suitable apparatus is shown in Figure 1.
4.2 Pressure source connected to the test specimens, capable of maintaining for at least I ha minimum water or air pressure to an accuracy of ±2 %.
5 Test pieces
The test specimen shall consist of one or more joints formed by the assembly of at least one fitting and one or more pieces of plastic pressure pipe of the size and quality for which the fitting is designed.
The fittings and pipes shall not be tested until 24 h after their production. For practical reasons, the manufacturer can wait a shorter time before testing. In case of dispute, a duration of 24 h shall apply.
One end of the test specimen shall be connected to the pressure source. The other end(s) shall be sealed off in such a way that, when the test pressure is applied, longitudinal stresses are exerted within the pipe wall due to the pressure acting on the end fittings.
The assembly of the joint should be carried out in accordance with the manufacturer’s instructions.
6 Procedure
Fill the test specimen with water or air at the specified test temperature. If water is used as test medium ensure all air is removed and excluded from the test piece for the remainder of the procedure.
Secure the test specimen to the apparatus. Minimum conditioning times are given in Table 1.ISO 3458 pdf free download.
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