Saturday, March 8, 2014

Pressure measurement calculations in U - Tube and Inclined tube manometers using Microsoft Office Excel.

Pressure is defined as the force exerted per unit area. In Chemical, Mechanical and Civil Engineering works pressure measurement is important in determining the frictional losses, velocity ( Using Hagen Poiseuille equation), pipe line size, etc., Also the pressure difference will indicate the type of pump, compressor to be used in liquids and gases. In order to measure the pressure difference existing in a pipe, we can use a U -Tube manometer. The two ends of the U - Tube manometer are connected to pipe in such a way that one end will be at upstream and the other in stream. Due to the pressure difference in pipe the level in the manometer limbs will differ, we will use this difference for pressure drop calculation. For this type manometer , density of manometer liquid should be higher than the density of liquid in pipe.U- tube manometer is used for normal pressure difference calculation in pipelines.
Inclined Tube Manometer calculation using Microsoft excelU Tube Manometer calculation using Microsoft excel

Where as inclined tube manometer is used for measuring small differences in pressure, here enlargement is provided in the vertical leg so that the movement of meniscus in the enlargement is negligible within the operating range of the instrument.
You can Download the pressure difference calculation Excel sheet here. It includes pressure conversion feature.

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Excel file for pressure calculation in manometer.