ISO 7432 pdf download – Glass-reinforced thermosetting plastics (GRP) pipes and fittings一Test methods to prove the design of locked socket-and- spigot joints, including double-socket joints, with elastomeric seals.
For the tests detailed in 7.2, 7.3 and 7.8. the arrangement shall be as shown In Figure 1. For the test detailed in 7.4. the arrangement shall be as shown in Figure 2. For the test detailed in 7.5, the arrangement shall be as shown in Figure 3. For the test in 7.5, see annex A for details on determining the maximum deflection 1 (see Figure 3) at mid-span and the magnitude of the bending force F2. In the test in 7.5. the length L shall be not greater than 8 m. In all these arrangements, a joint of the same size and design shall be used The same test piece may be used for more than one test procedure providing it is undamaged and of sufficient &ze to enable the test conditions to be achieved.
The total effective length L of the assembly shall be not less than that specified in the referring specification and shall allow, if required, the joint under test to b. located in the middle of the test arrangement.
The joint shall be assembled in accordance with the manufacturer’s recommendations and the requirements of the referring specification.
4.2 Number of test pieces
The number of test pieces shall b€ as specsfled In the referring specification.
5 Conditioning
For any interval between assembly of the test pieces in accordance with clause 4 and conditioning performed in accordance with the following paragraph, store the test pieces at temperatixes which do not exceed the test temperature (see clause 6).
Unless otherwise specified in the referring specification, following assembly condition the test pieces at the test temperature (see clause 6) for at least 24 h prior to testing.
6 Test temperature
Conduct the following procedure at the temperature specdled In the referring specification.
7 Procedure
7.1 General
Subject a test piece (see clause 4) to the applicable tests in 7.2 to 7,6 (see Table 1 for a summary).
NOTE Each reference to hydrostatic pressure specifies a positive internal gauge pressure (I.e. relative to atmospheric pressure), and the nominal pressure is Ihal relevant to th joint under test
If a test Is interrupted, record the details in the test report and repeat the particular test before carrying on to the next, if applicable. Failure of the end-sealing devices or the pipe shall not constitute failure of the joint but. it the test conditions are invalidated thereby, repeat the particular test after replacing the failed component.
7.2 Leaktightness when subjected to a pressure differential
7.2.1 Assemble the test piece as shown in Figure 1. using supports (see 3.2) if appropriate
7.2.2 Fix the end-sealing devices to the pipes.
7.2.3 Condition the test piece In accordance with clause 5.
7.2.4 Connect to the vacuum pump (3.5).
7.4.9 Maintain the pressure of 1,5 times the nominal pressure of the pnt, expressed in bars, within ±2 % for
24 h (see Table 1).
7.4.1 0 Inspect the joint for signs of leakage or damage and record the observations. If no leakage or damage is found, proceed In accordance w4th 7.4.11. OtherwIse stop the test.
7.4.11 Reduce the pressure to atmosphenc.
7.4.12 Steadily raise the internal pressure to 1,5 times the nominal pressure of the joint, expressed in bars, and reduce agaxi to atrnosphedc pressure so as to complete the cycle a a tsie between 1,5 mm and 3 mm
7.4.13 Repeat this cycle a further nine times.
7.4.14 Inspect the joint for signs of leakage and record the observations.
7.5 Resistance of joint to bending and pressure including hydrostatic end thrust
7.5.1 Assemble the test arrangement as shown in Figure 3 uswig a test piece conforming to clause 4 and having an effective length not exceeding 8 m. Determwie the values of F2 and tin accordance with annex k
7.5.2 Connect the end-sealing devices to the pipes in such a way that the full loads induced by me internal pressure will be transmitted along the pipes to the jomt under test.
7.5.3 If the manufacturer’s declared angular deflection of the joint is greater than 1 ,4. then apply the declared deflection, position the stop to prevent further movement and proceed In accordance with 7.5.5.
7.5.4 If the manufacturer’s dedared angular deflection of the joint is I .4’ or less, then position the stop to prevent a deflection greater than A.
7.5.5 Condition the test piece in accordance with clause 5.
7.5.6 Fl the test piece with water arid vent to remove any air.
ISO 7432 pdf download – Glass-reinforced thermosetting plastics (GRP) pipes and fittings一Test methods to prove the design of locked socket-and- spigot joints, including double-socket joints, with elastomeric seals
