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…

Inglenook received an e-mail the other day from a long-time client asking what references we used when specifying restriction orifices for several emergency blowdown systems we had designed a few years earlier.  The primary concern…

Inglenook Engineering was founded to provide sound engineering and process safety advice to operating companies around the world.  Our mission statement is: we aim to help facilities operate safely and efficiently without injuring personnel or…

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…

One of the more complex situations for control valve failure is associated with the level control on the liquid bottoms of an upstream vessel operating at a pressure significantly higher than the downstream system.  Opening…

The potential for heat input from an external fire resulting in the overpressure of a pressure vessel is one of the most common overpressure scenarios identified in processing plants.  Reducing the required relief rate can…

Manufacturers of pressure relief valves are required to publish capacity data for their valves, and quite often this is translated into an effective coefficient of discharge (Kd).  These discharge coefficients are typically published for water…