Measurement of Pressure - AISSMS Polytechnic
- 1. MEASUREMENT OF PRESSURE Rajesh D. Bhosale (Lecturer, Department of Mechanical Engineering , AISSMS polytechnic , Pune)
- 2. Manometers Manometers are used for measuring pressures by balancing the fluid column of fluid against another column of fluid of known specific gravity. • Manometers can be classified as: Simple Manometer Differential Manometer
- 3. Manometers • Simple Manometers Simple monometers consists of glass tube having one of its end connected to a point where pressure is to be measured and other end is open to atmosphere. • Types of Simple manometers are: 1) Piezometer 2) U-tube manometer 3) Single column manometer
- 4. Piezometer • It consists of a glass tube inserted in the wall of the vessel or pipe at the level of point at which the intensity of pressure is to be measured as shown in Fig. • The other end of the piezometer is exposed to air. • The height of the liquid in the piezometer gives the pressure head from which the intensity of pressure can be calculated.
- 5. U- tube Manometer • A U-tube manometer consists of a glass tube bent in U-Shape, one end of which is connected to the point at which pressure is to be measured and the other end is exposed to atmosphere. • U-tube consists of a liquid of specific of gravity is greater than the specific gravity of the liquid whose pressure intensity is to be measured.
- 6. Differential Manometers • Differential manometers are used to measure the difference of pressures between two points in a pipe or in two different pipes • Types of differential manometers are: – Simple U-tube Differential manometers – Inverted U-tube differential manometers
- 7. Simple U-Tube Differential Manometers The two points A and B are at different level and also contained liquids of different specific gravity. These points are connected to the U-tube manometer. Let the pressure at A and B are PA and PB.
- 8. Inverted U-Tube Differential Manometer •It consists of an inverted U-tube having two ends are connected to the pipes at points A and B whose difference of pressure is to be measured as shown in Fig. •It is used for measuring the difference of low pressures. Let the pressure at A is more than the pressure at B.
- 9. Advantages, Disadvantages and Applications Advantages : Simple in construction Low cost hence easy to buy. Very accurate and sensitive It can be used to measure other process variables. Disadvantages : Fragile in construction. Very sensitive to temperature changes Applications : It is used for low range pressure measurements. Extensively used in laboratories. Is used in Orifice meter and Venturi-meter for flow measurements. It is used for calibration of gauges and other instruments. It is used for measuring pressure drop in different joints and valves.
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