ASME PTC 25:2018 pdf free download

ASME PTC 25:2018 pdf free download.Pressure Relief Devices.
lot of rupture disks: those disks manufactured of a material at the same time and of the same size, thickness, type, heat. and manufacturing process. including heat treatment.
marked breaking pressure: the value of pressure marked on a breaking pin or a shear pin device or its nameplate.
marked burst pressure: the value of pressure marked on the rupture disk device or its nameplate or on the tag of the rupture disk, indicating the burst pressure at the coincident disk temperature.
marked relieving capacity: see rated relieving capacity.
marked set pressure: the value or values of pressure marked on a pressure relief device.
measured relieving capacfty: the relieving capacity of a pressure relief device measured at the flow-rating pressure, expressed in gravimetric or volumetric units.
opening pressure: the value of increasing inlet static pressure of a pressure relief valve at which there is a measurable lift or at which the discharge becomes continuous as determined by seeing, feeling, or hearing.
overpressure: a pressure increase over the set pressure of a pressure relief valve, usually expressed as a percentage of set pressure.
popping pressure: the value of increasing inlet static pressure at which the disk moves in the opening direction at a faster rate as compared with corresponding movement at higher or lower pressures.
primary pressure: the pressure at the inlet in a pressure relief device.
rated relieving capacity: that portion of the measured relieving capacity permitted by the applicable code or regulation to be used as a basis for the application of a pressure relief device.
reference conditions: those conditions of a test medium that are specified by either an applicable standard or an agreement between the parties to the test, which may be used for uniform reporting of measured flow test results.
relieving conditions: the inlet pressure and temperature on a pressure relief device during an overpressure condition. The relieving pressure is equal to the valve set pressure or burst (or the rupture disk burst pressure) plus the over- pressure. (The temperature of the flowing fluid at relieving conditions may be higher or lower than the operating temperature.)
relieving pressure: set pressure plus overpressure.
resealing pressure: the value of decreasing inlet static pressure at which no further leakage is detected after closing. The method of detection may be a specified water seal on the outlet or other means appropriate for this application.