ISO 3458:2015 pdf free.Plastics piping systems一Mechanical joints between fittings and pressure pipes 一 Test method for leaktightness under internal pressure.
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 test standard shall be used and the requirements shall he fulfilled. If one 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 1 h a minimum water or air pressure to an accuracy of ±2 %.
4.3 Pressure measuring device (7), capable of checking performance of the test pressure with 42.
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.
If water is used as test medium and the test is carried out in air, ensure that the outside of the test specimen is completely dry.
After conditioning, progressively and smoothly apply the specified test pressure in the shortest time practicable. The test starts on achieving the required test pressure.
Maintain the specified temperature within ±2 °C, and pressure within ±2 %, while monitoring the apparatus for any indication of a loss of pressure and the test piece for any signs of leakage for the specified time or until failure as follows:
a) terminate the test and record the observations if during the period the pressure cannot be maintained and the losses occurred at the joint, or within a distance of one pipe diameter from the joint under test;
b) repeat the test if the pipe(s) fail(s) at a position further than one diameter from the joint(s) under test. If air is used as test medium, leakage can be detected with leak detection fluid.
7 Test report
The test report shall include the following information:
a) a reference to this International Standard (e.g. ISO 3458) and to the referring International standard;
b) the nominal pressure class or S series of the components [e.g. fitting(s), pipe] comprising the joint(s) under test;
c) all details necessary for identification of the test pieces, including the nominal size of the pipes and fittings used to produce the test pieces, the type of material and the manufacturer’s code.ISO 3458 pdf download.