Previous reports had indicated that a glass mat reinforced polyester 250-barrel oil field storage tank showed little increase in circumferential measurement. It was found, however, that this tank suffered a tension failure at one of its staves and had to be scrapped after only 46 months' service.
Data are given to show the results of circumferential measurements made on a glass-epoxy 250-barrel oil field stock tank in both the full and the empty condition over one winter and three summers. Results also are reported of circumferential measurements made on a full 500-barrel wash tank during two summers. The average increase in circumference between the first and second summer for the 500-barrel tank was 0.020 as compared to 0.006 feet for the 250-barrel tank. 7.5.5
