The service life prediction models employ the failure time from a
PENT, SENT, or SENB [single edge notch bending] (18) test to obtain the performance life of HDPE pipe with a detected flaw depth, operating temperature, and pressure.
t = t(
PENT)(0.468/K)[.sup.n] exp[-Q/R(1/T - 1/353)] (7)
Figure 2 shows the effect of T and S on the failure time of pressurized pipe; Figure 3 is for the
PENT test.
Rhan o ogoniant y lle i John, ydy'r ffaith fod y
pent ref o'r neilltu, yn fan y mae'n rhaid bod eisiau ymweld ago, man lle mae'r ffyrdd yn arwain i unman ond y mor a'r chwarel a'r mynydd - lleoliad tebyg iawn i bent ref arall a fwynhaodd sylw'r wasg gyda'r gyfres Pentre Ni.
Mae'r gyfrol yn archwilio grym delwedd y
pent re gwledig yn rhai o lyfrau enwocaf Cymru -- yn Gymraeg a Saesneg -- o blwyfi delfrydedig Llanuwchllyn O M, a Rhydcymerau D J Williams, i bent refi hunllefus y ddau Garadog (My People, Caradoc Evans a Un Nos Ola Leuad, Caradog Prichard).
It is evident that at elevated temperatures, the volume shrinkage of the blends is higher than that of PETN and
PENT copolymers but lower than that of the pure PET homopolymer.
The new products also boast ESCR values above 5000 hr and
PENT values beyond 150 hr.
Wilkinson s
pent eight years at Elland Road hot seat before being shown the exit door in September 1996, but believes a successful home grown policy paid handsome dividends.
Since there is tremendous
pent up demand for quality new space in the region, we anticipate very strong tenant interest for Wall Business Center II."