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 »The Center for Chemical Process Safety (CCPS) defines process safety time as “the time period between a failure occurring in the process or its control system and the occurrence of the hazardous event.”1 Process safety…
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 »A rupture disk (RD), also known as a pressure safety disk, burst disk, bursting disk, or burst diaphragm, is a non-reclosing pressure relief device that can be used as the sole device as well as…
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 »Overpressure protection must be provided for pressurized equipment by means of pressure relief devices, which sometimes require isolation and removal for inspection or repair. It would be advantageous to have a means of isolation without…
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