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In a pipe line or vessel if vertically placed and two pressure gauges mounted in top and bottom places of the pipe line and the internal pressure will very. Top mounted pressure gauge is lower than the bottom mounted pressure gauge. The Pressure will change due to the height variation's. The Internel fluid height acting additional pressure . so that the pressure difference in two gauges located in different heights.

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Can you see the difference between a wet and a dry standpipe system?

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