# Calculating Flow From Tank to Impeller

• imagine2014

#### imagine2014

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.

#### Attachments

• Pump Config.pdf
201.4 KB · Views: 51

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.

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. :)

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.

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).

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.