Calculating Flow From Tank to Impeller

  • Thread starter imagine2014
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In summary: The diagram does not include all pertinent information.In summary, the sewage pump is drawing wastewater from a tank, but there is a small distance between the invert to the impeller and the suction line. The flow will enter through the opening, versus from the suction line. The diagram does not include all pertinent information.
  • #1
imagine2014
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TL;DR Summary
Looking to calculate the flow through a slot in a pipe versus the overall flow
Wondering if someone can help me with the following.

If I have a sewage pump drawing wastewater from a tank, but there is a small distance between the invert to the impeller and the suction line, how much flow will enter through the opening, versus from the suction line.

Can anyone explain in simple terms how to do this or if there is an online calculator that will? Simple diagram attached. Not sure if the information included is sufficient to make a determination.
 

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  • #2
What is the flow direction on your diagram? I think its from the "blue tank" to the "trapezoid", but you have the "intake" labeled like its from the "trapezoid" to the blue tank?

Going to have to ask several questions to get you there.
 
  • #3
hi,
Sorry for the delay. The flow is being drawn through the box outlet into the base of the trapezoid. Happy to answer anything else that might help. :)
 
  • #4
So the flow is leaving through the top of the blue tank.

  1. the "T" labeled "3/4 inch suction port"; is the end without a hose open to atmosphere so you don't create a vacuum?
  2. Is there a hose inside the tank, running to the bottom?
  3. How long is the hose?
  4. What is the fluid?
There will be more questions to follow.
 
  • #5
erobz said:
So the flow is leaving through the top of the blue tank.

  1. the "T" labeled "3/4 inch suction port"; is the end without a hose open to atmosphere so you don't create a vacuum?
  2. Is there a hose inside the tank, running to the bottom?
  3. How long is the hose?
  4. What is the fluid?
There will be more questions to follow.
1. In the T, labelled 3/4" suction port, there is a standpipe that goes up a distance of 7-13' (depending on installation), which has a ball valve at the top. It is meant to bleed out the air to prime the pump initially, and after, it is closed and used as a cleaning port)

2/3. There is only the hose between the "Tee" and the Invert of the pump; and then from the outlet of the pump to the discharge of the tank that contains all components. Please note that all components are submerged, contained in a below-ground tank. The hose between the "Tee" and the pump invert is approximately 6-8' long, the hose between the pump outlet and the tank discharge port is approx. 15-20'.

4. The fluid is residential wastewater (sewage).
 
  • #6
You're going to have to present a better diagram. There must be a line that runs to the bottom of the tank. Feel free to make another diagram or mark up this picture.
Sewage Tank.jpg
 

FAQ: Calculating Flow From Tank to Impeller

What is the formula for calculating flow from a tank to an impeller?

The formula for calculating flow from a tank to an impeller is Q = AV, where Q is the flow rate in cubic meters per second, A is the cross-sectional area of the tank outlet in square meters, and V is the velocity of the fluid in meters per second.

How do you determine the cross-sectional area of the tank outlet?

The cross-sectional area of the tank outlet can be determined by measuring the diameter of the outlet and using the formula A = πr^2, where A is the area and r is the radius of the outlet.

What factors can affect the flow rate from a tank to an impeller?

The flow rate from a tank to an impeller can be affected by factors such as the size and shape of the tank outlet, the viscosity of the fluid, the speed of the impeller, and any obstructions or blockages in the flow path.

How can the flow rate be increased from a tank to an impeller?

The flow rate from a tank to an impeller can be increased by increasing the velocity of the fluid, increasing the cross-sectional area of the tank outlet, or increasing the speed of the impeller.

What are some common methods for measuring flow rate from a tank to an impeller?

Some common methods for measuring flow rate from a tank to an impeller include using a flow meter, timing the flow using a stopwatch and measuring the volume collected, or using pressure sensors to measure the pressure difference between the tank and the impeller.

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