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Pressure Measurement · Glossary

What is Static Pressure?

line pressurePressure Measurement

Static pressure is the pressure of a fluid measured at right angles to the flow, without the effect of its velocity.

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Static Pressure Explained

A wall tapping flush with the pipe senses static pressure. A probe facing the flow senses total pressure, which adds the dynamic pressure ½ ρ v².

For DP transmitters, static pressure means the line pressure acting on both sides at once. It sets the body rating and can shift the zero.

Static Pressure Formula

ptotal = pstatic + ½ ρ v²
ptotalstagnation pressure
½ ρ v²dynamic pressure
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Calculators for Static Pressure

CalculatorPitot Tube CalculatorFree online calculator with formula and worked example.CalculatorAbsolute Pressure CalculatorFree online calculator with formula and worked example.

Frequently Asked Questions

What is Static Pressure?

Static pressure is the pressure of a fluid measured at right angles to the flow, without the effect of its velocity.

Why must a tapping be flush with the pipe wall?

A burr or protruding tapping senses some dynamic pressure and gives a biased reading.

What is maximum static pressure on a DP transmitter?

The highest line pressure the body can take on both sides together, often much higher than the DP range.

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Related Terms

Pressure termStatic Pressure EffectStatic pressure effect is the change in a DP transmitter reading caused by line pressure acting on both sides.Pressure termDifferential PressureDifferential pressure is the difference between two pressures measured at two points.Pressure termPressurePressure is force acting per unit area. In fluids it acts equally in all directions at a point.

More Pressure Measurement Terms

Pressure termUpper Range LimitUpper range limit is the highest value a transmitter sensor can be calibrated to measure.Pressure termTransmitter TurndownTransmitter turndown is how far a transmitter span is reduced from its sensor upper range limit.Pressure termOverpressure LimitOverpressure limit is the highest pressure a sensor can take without damage or loss of its calibration.Pressure termBurst PressureBurst pressure is the pressure at which the sensor or pressure boundary ruptures and process fluid can escape.Pressure termMaximum Allowable Working PressureMaximum allowable working pressure is the highest gauge pressure permitted at the top of a vessel at its…Pressure termDesign PressureDesign pressure is the pressure used to design equipment, set with a margin above the maximum expected…

All pressure measurement terms · Full glossary A to Z

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