Let me add some additional information. This is for a pipeline with roughly 3.6 million pounds of water and 57500 cubic feet of area. The density is just over 1 g/cm3 at 50 PSI. Height will remain constant as will the volume. So by my thinking, I will have to add 3 times the water to increase the density by 3 times and thus the pressure 3 times. But that is contrary to my experiences with raising the PSI of pipelines in this manner.