scope:

This standard specifies three basic test methods for determining the leaktightness of elastomeric sealing ring type joints for buried thermoplastics non-pressure piping systems. It also gives a consecutive test method where the three methods are executed succesively. Unless otherwise specified in the referring standard, the methods use the following pressures respectively: - method 1: low internal hydrostatic pressure for assessing leaktightness; - method 2: high internal hydrostatic pressure for assessing performance; ; - method 3: internal negative air pressure (partial vacuum); - method 4: a combination of the methods 1, 2 and 3. It also describes three test conditions, as follows: a) without any additional deformation or distorsion; b) with diametric distortion; - c) with angular deflection, under which the test can be executed. These conditions may be applied individually or in combination. The applicable selection of the method(s) and the condition(s) have to be specified in the referring standard.