Glossary
Pressure Measurement Terms
Pressure terms: gauge, absolute and differential pressure, transmitter ranges, gauges, seals and relief valve terms.
32terms
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All Pressure Measurement Terms
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FormulaAbsolute PressureAbsolute pressure is pressure measured relative to a perfect vacuum, so it is never negative.TermAccumulationAccumulation is the pressure rise above the MAWP of the protected equipment while the relief…FormulaAtmospheric PressureAtmospheric pressure is the pressure of the air around us; it falls with altitude and varies…TermBack PressureBack pressure is the pressure at the outlet of a relief valve, from the discharge system or…FormulaBlowdownBlowdown is the difference between the set pressure of a relief valve and the pressure at which…TermBourdon TubeA Bourdon tube is a curved tube of oval cross section that straightens as pressure rises,…TermBurst PressureBurst pressure is the pressure at which the sensor or pressure boundary ruptures and process…FormulaCapacitive Pressure SensorA capacitive pressure sensor measures pressure from the change in capacitance as a diaphragm…
TermDesign PressureDesign pressure is the pressure used to design equipment, set with a margin above the maximum…TermDiaphragm SealA diaphragm seal isolates a pressure instrument from the process with a flexible diaphragm and…DPDifferential PressureDifferential pressure is the difference between two pressures measured at two points.TermFill FluidFill fluid is the incompressible liquid inside a pressure sensor or diaphragm seal that…FormulaGauge PressureGauge pressure is pressure measured relative to the local atmospheric pressure, so it reads…FormulaHydrostatic PressureHydrostatic pressure is the pressure created by the weight of a liquid column; it depends only…FormulaHydrostatic Test PressureHydrostatic test pressure is the pressure at which piping or vessels are tested with liquid to…FormulaManometerA manometer measures pressure from the height difference of a liquid column in a U tube or…
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MAWPMaximum Allowable Working PressureMaximum allowable working pressure is the highest gauge pressure permitted at the top of a…TermOverpressure LimitOverpressure limit is the highest pressure a sensor can take without damage or loss of its…TermPiezoresistive Pressure SensorA piezoresistive pressure sensor uses resistors on a diaphragm whose resistance changes with…pPressurePressure is force acting per unit area. In fluids it acts equally in all directions at a point.TermPressure Gauge SiphonA pressure gauge siphon is a looped or U shaped tube fitted below a pressure gauge on steam to…hPressure HeadPressure head is pressure expressed as the height of a liquid column that would produce it.TermPressure SnubberA pressure snubber is a restriction fitted before a gauge or switch to damp pulsation and…FormulaPressure Switch DeadbandPressure switch deadband is the difference between the pressure at which a switch trips and the…
TermSet PressureSet pressure is the inlet gauge pressure at which a pressure relief valve is adjusted to start…FormulaStatic PressureStatic pressure is the pressure of a fluid measured at right angles to the flow, without the…TermStatic Pressure EffectStatic pressure effect is the change in a DP transmitter reading caused by line pressure acting…FormulaTransmitter TurndownTransmitter turndown is how far a transmitter span is reduced from its sensor upper range limit.URLUpper Range LimitUpper range limit is the highest value a transmitter sensor can be calibrated to measure.FormulaVacuumVacuum is any pressure below atmospheric pressure, from slight suction to near perfect vacuum.FormulaWater HammerWater hammer is the pressure surge created when a moving liquid is suddenly stopped, for…FormulaZero Elevation and SuppressionZero elevation and suppression shift a transmitter range to cancel the head of liquid in…
Frequently Asked Questions
What does the pressure measurement glossary cover?
Pressure terms: gauge, absolute and differential pressure, transmitter ranges, gauges, seals and relief valve terms.
Are the formulas checked?
Yes. Formulas follow the relevant standards such as ISO 5167, and every worked example is calculated and checked.
Other Glossary Sections
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