The formula is Pressure (P) x Head (M) x Specific Gravity (SG) Abbreviated to P x H x SG Pressure = 0.0981 x M x SGĮxample: Water at 10M Head - Water has a specific gravity of 1 = 0.0981 x 10 = 0.981 Bar To convert Head in Metres to Pressure in Bar a formula is required. Manometers on pumps indicate suction and delivery pressures, and the corresponding differential pressure, which does not take into account the specific gravity of the fluid being pumped meaning any readings provided need to be checked against the fluids specific gravity to calculate the differential pressure being produced. A calculation of the pressure will change according to the fluid’s specific gravity. What is pressure? Pressure is fluid dependent and relative to fluid density. Head is the height of fluid typically expressed in (MLC) Metres of Liquid Column or represented with the unit M. It often causes confusion leading to a miscalculation of the correct pump specification to use. The discharge pressure of a pump is commonly referred to as head or pressure, but head and pressure are not the same across all liquids.
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