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According to the Technical Rules for Portable Water Installations DIN1988, the test pressure has to be 1.5 times of the working pressure for piping systems.

When carrying out the pressure test, the material properties of PP-R pipes lead to an expansion of the pipe, which influenc-es the test result. A further influence to the test result can be caused by the coefficient of thermal expansion of PP-R pipes.Different temperatures for pipe and test medium lead to difference of 0.5 to 1 bar. Therefore, the highest probable constant lemperature of the test medium has to be ascertained at the hydraulic pressure test of installations with PP-R pipes.

The hydraulic pressure test requires a preliminary, principal and final test. For the prelimnary test, a test pressure of 1.5times of the highest probable working pressure has to be produced. This test pressure has to be re-established twice within 30 minutes within an interval of 10 minutes. After a test time of further 30 minutes, the test pressure must not drop more tnan 0.6 bar and no leakage will appear.

The preliminary test is to be followed directly by the principal test. The test time is 2 hours. On doing so, the test pressure may not fall more than 0.2 bar. When the preliminary and principal tests are completed, the final test follows, which has to be effected with a test pressure of alternate 10 bar and 1 bar in a rhythm of at least 5 minutes. Belween each test,the pressure has to be released. No leakage may appear at any point.