ASME B40.100-2005 pdf download

ASME B40.100-2005 pdf download.Pressure Gauges and Gauge Attachments.
dial, mirror: a dial with a reflector band adjacent to the scale forthepurpose ofreducingreading-parallaxerrors. dial nomenclature: see nomenclature, dial. diaphragm: an elastic element in the form of a single flat or convoluted plate that deforms to provide displace- ment in response to a change in pressure differential across the plate (see Fig. 3). diaphragm capsule: an elastic element comprised of two convoluted diaphragm plates jointed to form a capsule or pressure container that expands and contracts in response to a change in pressure differential across the plates. Diaphragm capsule elements may have one or more capsules to provide appropriate displacement (see Fig. 3). differential gauge: see gauge, differential. differential pressure: see pressure, differential. duplex gauge: see gauge, duplex. elastic element: see element, elastic. element, elastic: the elastic component of the pressure element assembly that moves in response to pressure changes. It may be a Bourdon tube, bellows, diaphragm, or other type of member (see Fig. 3). element assembly, pressure: the assembly, including the elastic element, that converts a pressure change into motion. It may also include a stem, tip, restrictor, and other components (see Fig. 2). environmental conditions: see conditions, environmental. 7 error: the difference between the indicated value and the true value of the variable being measured. A positive error denotes that the indicated value is greater than the true value (see also correction). error, fatigue: the change of pressure indication that results from repeated applications of stress (pressure cycles). Itis expressed as a percentage ofspan, number of cycles, and minimum and maximum values of pressure cycles. error, friction: the difference between indicated readings before and after the gauge has been lightly tapped. error, hysteresis: the difference between increasing pres- sure and decreasing pressure readings at any point on the scale obtained during a pressure cycle after friction errors have been eliminated by tapping (see para. 6.2.4.3 and Fig. A-1). error, offset: the error exhibited when the elastic element is unpressurized. It is expressed as a percentage of span (see Fig. A-1). error, position: the change of pressure indication that results when the gauge is placed in a position different from that in which it was calibrated. error, span: the error exhibited when the input is at maxi- mum scale pressure minus the error exhibited when the input is at minimum scale pressure. It is expressed as a percentage of span. error, temperature: the change of pressure indication that results when the gauge components are at a temperature different from the temperature at which they were cali- brated. explosive failure: see failure, explosive. extreme operating conditions: see conditions, extreme operating failure, corrosion: elastic element failure resulting from corrosive chemical attack on the element walls (see para. 4.2.7.3). failure, explosive: elastic element failure caused by the release ofexplosive energygeneratedbya chemical reac- tion inside the element (see para. 4.2.7.4). failure, fatigue: elastic element failure resulting from repeated applications of stress (see para. 4.2.7.1). failure, overpressure: elastic element failure caused by the application of internal pressure (positive or negative) in excess of the rated pressure of the element (see para. 4.2.7.2). failure, overtemperature: failure as a result of continuous exposure to high ambient temperature. failure, thermal shock: failure as a result of repeated, rapid exposure to ambient temperature extremes. fatigue failure: see failure, fatigue.
pressure, absolute: a pressure using zero absolute pressure as datum (see Fig. 1). pressure, ambient: the pressure surrounding the gauge, usually atmospheric (barometric) pressure (see Fig. 1). pressure, burst: see pressure, rupture. pressure, differential: the difference between two pres- sures (see Fig. 1). pressure element: see element assembly, pressure. pressure, fullscale: the highestnumericallydefinedgradu- ation on the unretarded portion of the scale. pressure, gauge: apositive pressure(greater thanambient) or negative pressure (less than ambient) using ambient pressure as datum (see Fig. 1). pressure gauge: see gauge, pressure. pressure, negative (vacuum): gauge pressure less than ambient pressure using ambient pressure as datum (see Fig. 1). pressure, operating: the pressure at which a gauge is nor- mally operated. pressure, positive: gauge pressure greater than ambient pressure (see Fig. 1). pressure, process: the pressure of the process medium at the pressure connection of the sockets.