API Standard 521, 6th Edition, §4.4.12.4.1 provides an equation (shown below) for the calculation of the pressure rise due to hydraulic expansion of a non-boiling liquid1.  The calculation is comprised of four basic components: the…

We recently encountered cases where the corrected hydrotest pressure needed to be determined, and thought it would be useful to share the calculation process.  The cases in question were various tube ruptures potentially affecting a…

Following the release of the most recent Fireside Chat on pressure relief critical controls, we received a question specific to critical check valves, or non-return valves (NRVs), and our thoughts on taking credit for them…

There are several controls used in a facility in various ways that directly affect the relief system design or design basis, and are critical to the design of a pressure relief system.  While there are…

An inadvertent mixing of hot and volatile fluids can result in overpressure if the volatile fluid is vaporized and sufficient volumetric accumulation occurs.  Hot fluid temperatures exceeding the bubblepoint temperature of the volatile fluid is…