When comparing the PENT (S = 25 mm, Width, W=10mm, a,/W = 0.
Figure 7 shows that for the same amount of crack growth/extension ([DELTA]a), the variations of SIF with crack growth in the PENT and SENT and whole-pipe tensile specimens are different.
From earlier investigations (9) it was found that the SCG test failure time using SENT tests on parent material could be correlated to the 10k or 2k PENT failures on the compounded resin materials.
Nomenclature BPV Boiler and Pressure Vessel DR dimensional ratio (DR = OD/thickness) FEA finite element analysis HDPE high-density polyethylene ID inner diameter of pipe OD outer diameter of pipe PE polyethylene PENT Pennsylvania edge notch tension SCG slow crack growth SENT single edge notch tension SIF stress intensity factor ([K.
Note that the lifetime of the pipe is directly proportional to the PENT value of the resin.
The above calculation was repeated for the case of a 100-year lifetime and a PENT value of 500 hr.
Note that the above results depend on the ratio of lifetime to PENT value and not on unique values of life time or PENT.
7, and since pipe test and PENT test were both done at 80[degrees]C
The answer depends on the hoop stress, the average ground temperature, and the PENT value of the resin.
t(pipe) = 118,000 t(PENT) hours or 13 years of pipe life time corresponds to 1 hr of PENT.
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For more information on Pent Energy, please contact Luke Pent at 817-332-4411 or 817-829-3478 mobile or lpent@sbcglobal.