Optimizing Fluid Flow into Tanks: Pressure, Diameter, and Length Considerations

In summary, the conversation discusses a scenario where a pipe is connected to an empty atmospheric tank and the flow is from the pipe into the tank. The pressure at the pipe inlet is 500kPag and there are no fittings in between. The question is whether the pressure of the liquid just after it leaves the pipe is 500kPag or atmospheric. The conversation also mentions that the flow rate is 180m3/hr and that pressure loss in a pipe is not only due to fittings, but also inherent in the flow itself. It is noted that the pressure at the outlet will only be equal to the inlet pressure if there is no flow. If the pipe is exhausting into the atmosphere, the pressure will be 1 atm, but if
  • #1
Moolan
5
0
Hi,

I got a puzzling question. In a scenario where I have a pipe connected to an empty atmospheric tank and the flow is from the pipe into the tank.

Pressure at the pipe inlet is 500kPag and the pipe diameter and length is 6" and 5m respectively.

There are no fittings in between. I can safety assume that the pressure loss from pipe is negligible (including entrance loss).

So, can I say the pressure of the liquid just after it left the pipe is 500kPag or atm? If atm, does this energy gets converted to velocity?

Thanks.

Edit: Forgot to add the flow is at 180m3/hr, so not excessive to cause massive pressure loss.
 
Last edited:
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  • #2
pressure loss in a pipe is not only due to fittings, the loss is inherently embedded into the flow itself. whenever there is a flow, some loss would be here.

Pressure at outlet will be equal to inlet pressure only when there is no flow.
 
  • #3
oops! apologies, i didnt read OP carefully :D

If the pipe is exhausting into atmosphere(ie pipe outlet is at atmospheric pressure), pressure will be 1 atm.

If the pipe is exhausting into the tank filled with the liquid, pressure at pipe outlet is above atmospheric.

And yes, the pressure energy gets converted to flow energy & a bit of it is used to overcome friction.
 

Related to Optimizing Fluid Flow into Tanks: Pressure, Diameter, and Length Considerations

What is fluid flow and why is it important in tank optimization?

Fluid flow refers to the movement of a liquid or gas through a system. In tank optimization, fluid flow is important because it determines the rate at which a tank can be filled or emptied, as well as the pressure and diameter requirements to achieve optimal flow.

How does pressure affect fluid flow into tanks?

The pressure of a fluid is directly related to its velocity, meaning that a higher pressure will result in a faster flow rate into the tank. However, too much pressure can cause turbulence and affect the efficiency of the flow. It is important to find the right balance between pressure and flow rate for optimal tank filling.

What role does the diameter of the tank play in optimizing fluid flow?

The diameter of the tank is a crucial factor in optimizing fluid flow. A larger diameter allows for a greater volume of fluid to enter the tank at once, resulting in a faster flow rate. However, a larger diameter also requires a higher pressure to maintain the same flow rate. It is important to consider the desired flow rate and the available pressure when determining the diameter of a tank for optimal flow.

How does the length of the tank impact fluid flow?

The length of the tank can affect fluid flow in a few ways. A longer tank with the same diameter will result in a slower flow rate, as the fluid has a greater distance to travel. Additionally, the length of the tank can impact the pressure requirements for optimal flow. A longer tank may require a higher pressure to maintain the desired flow rate compared to a shorter tank.

What other factors should be considered when optimizing fluid flow into tanks?

In addition to pressure, diameter, and length, other factors that should be considered when optimizing fluid flow into tanks include the viscosity of the fluid, the design of the inlet and outlet pipes, and any potential obstacles or restrictions within the tank or piping system. These factors can all impact the efficiency and effectiveness of fluid flow into the tank.

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