This study was undertaken with the objective of comparing, where possible, the experimentally obtained propagation pressures from a study at U.T. and a similar study carded out between 1973 and 1978 by Battelle researchers. Results from the latter were recently released by Battelle for the purpose of this comparison. It is important to note that the two studies were carried out independently using different pipe dimensions and materials. As such, any similar conclusions and trends from the two groups of results can be viewed as independent mutual verification of the studies.