Hydrostatic force on side of tank10/20/2023 ![]() Now, how does one calculate, from the hydrostatic pressure, the filling height of a closed, non-vented or pressurised tank or vessel? In a closed vessel, the pressure measurement is made, primarily, using standard industrial pressure sensors which are mounted at the side of the vessel or tank. Level measurement in closed or pressurised, thus non-vented vessels requires an additional pressure measurement of the enclosed gas by a second pressure sensor. ![]() Unlike open vessels, the calculation of level in closed geometries, such as gas-tight tanks or pressurised vessels, requires a compensation of the pressure of the gas enclosed above the liquid with the hydrostatic pressure measurement. The water level is indicated on a scale on the side of the quadrant.In a previous blog post, I explained the calculation of the filling height in open geometries and vessels. Water is added to the tank via a flexible tube and may be drained through a valve in the side of the tank. An indicator attached to the side of the tank shows when the balance arm is horizontal. Correct alignment is indicated on a circular spirit level mounted on the base of the tank. This assembly is mounted on top of an acrylic tank which may be levelled by adjusting screwed feet. The balance arm incorporates a hanger for the weights supplied and an adjustable counterbalance. This means that when the quadrant is immersed, the only force that gives rise to a moment about the knife edges is the hydrostatic force acting on the end face of the quadrant. ![]() ![]() The knife edges coincide with the centre of the arc of the quadrant. ![]() The Hydrostatic Pressure accessory has been designed to determine the static thrust exerted by a fluid on a submerged surface and enables comparison of the measured magnitude and position of this force with simple theory.Ī fabricated quadrant is mounted on a balance arm which pivots on knife edges. ![]()
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