Many of the relieving requirements for credible overpressure scenarios we calculate implicitly assume that the only mass/energy allowed to leave the system is through the relief device; however, there are some instances of reasonable attempts…
Read More »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…
Read More »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…
Read More »ASME Section VIII §UG-127(a)(2)1 indicates that the relieving capacity of a rupture disk used independently (that is, not on the inlet or outlet of a pressure relief valve) can be determined based on one of…
Read More »For overpressure protection systems involving pressure relief valves, the frictional losses in the inlet and outlet piping is used as a means for evaluating the installation of the pressure relief valve, particularly as a measure…
Read More »The API Standard 2000, 7th Edition thermal inbreathing calculation has conservative assumptions regarding the rainfall rate and fluid properties within the tank that can result in excessive venting requirements for small tanks, such as those…
Read More »The analysis for the flow of liquids through pressure relief devices in API and ASME standards is currently predicated on the fluid viscosity behavior being Newtonian; API Std 520 Part I, 8th edition (2014), explicitly…
Read More »Sudden tube ruptures in shell and tube heat exchangers operating at a high differential pressure in which the low pressure side contains an incompressible fluid and the high pressure side contains gas have been recognized…
Read More »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…
Read More »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…
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