How is the inlet pressure of the pump determined?
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The operating pressure of the tower is at atmospheric pressure. The liquid level in the tower is 8 m. Is the inlet pressure of the bottom circulation pump 0.08 or at atmospheric pressure?
Atmospheric pressure + ρ (density of the medium) * g * h (height of the hydrostatic level)
Tower pressure + static pressure; for greater precision, subtract the pipe resistance, and for even greater precision, subtract the kinetic energy loss as well
Actually, I want to know this question too. Logically, for storage tanks at atmospheric pressure, unless the material is highly volatile, there should be negative pressure on the inlet pipe. But our reviewers always say to simply specify atmospheric pressure, and no vacuum test is required in the pipeline characteristic table. . .
Does the control cabinet for the pump require a pressure stabilizing tank for control? What size ball valves are needed for the piping system?