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How much time does it take to drain an elevated water tank through a 14 inch pipe by gravity?
Wiki User
∙ 15y ago
More info is needed.
What is the elevation of the bottom of the tank relative to the outlet of the 14" pipe?
How much liquid is in the tank, and what are the tank dimensions?
What is the shape of the tank (cone, vertical, horizontal, sphere?)
How many fittings (elbows, turns, half-open valves etc.) are along the length of the pipe?
How much pressure is being applied to the surface of the liquid in the tank or is it open to the atmosphere?
Try this formula for a vertical tank with straight sides open to the atmosphere:
t = pi * D2 / Cd / A *sqrt (h / 8 / G)
where
t = time in seconds
pi = 3.14
D = tank diameter (feet)
Cd = orifice coefficient (use 0.61 for a sharp edge orifice)
A = cross-sectional area of outlet pipe (square feet; A = pi * pipe diameter2 / 4)
h = height of liquid in tank plus height of bottom of tank above pipe outlet (feet)
G = gravitational acceleration (32.2 ft/sec2)
Wiki User
∙ 15y ago
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