Can PVC pipe withstand a vacuum? If so, what is the maximum vacuum that PVC pipe can withstand?
Yes, PVC pipe can withstand vacuum pressures. According to research conducted by Dr. R.K. Watkins at Utah State University, vacuum pressures cannot collapse an underground PVC pipe that is properly encased in a soil envelope and exposed to normal service temperatures. In fact, quick calculations show that even under conditions of elevated operating temperatures of 100oF, the pressure required to collapse most PVC pipe is greater than atmospheric. In other words, the pipe can withstand a complete vacuum. Vacuum pressures are generally not considered a favorable occurrence in water distribution systems of any pipe material. However, if the effects on the entire system are taken into consideration, PVC offers adequate strength and safety to withstand vacuum pressures.
