BS ISO 10952:2014 pdf free
BS ISO 10952:2014 pdf free.Plastics piping systems一Glass-reinforced thermosetting plastics (GRP) pipes and fittings
failure which becomes apparent by the passage of the test liquid through the pipe wall
Note 1 to entry: Failures of the test sample have been observed at the spring-line location without leakage of the test liquid. While leakage is not observed, this can be considered a failure of the test sample as the strain levels in the sample will be altered invalidating any continuation of the test. The test can be discarded or optionally counted as a failure occurring at the time of spring-line breakage.
The interior of a test piece is exposed to a corrosive test liquid at a specified temperature while being maintained in a fixed diametrically deflected condition. The test is repeated at several deflection levels,using a fresh test piece each time and recording the time to leak failure at each deflection. The results are used to calculate an extrapolated deflection value for a specified period of time.Alternatively, the extrapolation can be performed using calculated or measured strains. Strain can be measured using strain gauges.
NOTE Use of strain allows testing using test pieces of variable thickness and stiffness classes. Deflection and strain are interrelatable by calculation.
It is assumed that the following test parameters are set by the International Standard making reference to this International Standard:
a) the composition of the test liquid (see Clause 5);
b) the number and length of test pieces (see Clause 7);
c) the preconditioning to be applied (see Clause 9);
d) the test temperature (see 10.1 or 11.1);
e) if failures do not occur (see 10.11 and 11.11), the specified deflection levels and related minimum time intervals;
f) the time to which the data have to be extrapolated (see Clause 12).
Loading frame, comprising two parallel steel sections and threaded rods which can maintain a constant deflection of the test piece (see Figure 1 for typical test set-up). The sections shall be sufficiently stiff such that visible bending or deformation of the sections does not occur during the compression of the test piece. Each section shall have a length equal to the length of the test piece plus at least 30 mm and a width of at least 100 mm.BS ISO 10952 pdf free download.
