For vessels containing compressed air, the requirements for overpressure protection are found in 29 CFR 1910.169(a)(2)(ii)1, which specifically references ASME Boiler and Pressure Vessel Code (BPVC), Section VIII.2 All equipment used in providing and utilizing…
Read More »Pressure changes from protected equipment to a pressure relief valve (PRV) and from a PRV to the final relief effluent location are determined to allow an evaluation of the effect of the pressures on the…
Read More »A subcooled yet flashing liquid, in which the vapor pressure is less than the relief pressure yet greater than the superimposed backpressure, represents an occasional non-ideal sizing condition, as the flow is neither fully liquid…
Read More »The 2nd edition of the CCPS Guidelines for Pressure Relief and Effluent Handling1 recommends the work of Darby2 for use in evaluating relief piping systems. We have already touched on the recommendations regarding roughness factors. …
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 »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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