Burst test long-term

It should be noted that the ASTM bursting-tests (D774 and D1599) are quick burst-type tests. They are applicable to situations that may be encountered in accidental pressure surging of pipes. The evaluation of long-term resistance to lower sustained pressures is generally more representative and is the subject of several test methods in the pipe industry. 

Graph of time-to- Extrapolation (in Long-term burst testing failure vs. hoop accordance with in accordance with stress in the extrapolation DIN 16887 on pipe... 

HDPE pipe is used in low pressure applications for transporting potable water, gas, acids, liquid hydrocarbons, oils, salt water, and other chemicals and solvents. Long-term load bearing, or creep, tests are essential to determine the life of PE pipe under pressure. HDPE pipe withstands pressures in short-term burst tests that are several times greater than long-term burst pressures because of the creep phenomenon. Broad molecular weight distribution resin, as obtained from chromium oxide catalysts, are ideal for most pipe applications. The introduction of superior, bimodal type, pipe resins in recent years has extended HDPE pipe applications. 

Long-Term Burst Strength Test (ASTM D 1598)... 

The long-term burst strength of plastic pressure vessels is determined by subjecting the pressure vessels to constant internal pressure and observing time-to-failure. This test is a static pressure test, as opposed to the dynamic quick-burst test described earlier. 

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