Calculating Water Pumping Requirements for River-to-Dam System

In summary, the conversation discusses how to calculate the necessary pumping requirements for delivering 100 megalitres of water per day from a river, up a 100-meter hill, and into a dam. It mentions the use of a concrete lined steel pipe, a total distance of 25 km, and the need to know the elevation of the dam. It also highlights the importance of determining the required total head for the pump, as well as the necessary electrical power and pipe size for velocity and head loss calculations. The question of whether this is for homework is raised, with the suggestion that the person asking should show what they have tried so far instead of simply asking for a solution.
  • #1
pushpull
2
0
How is following calculated ?
Pumping water from river, up a hill 100 metres high, it then runs downhill into a dam.
Need to deliver 100 megalitres a day, the pipe will be concrete lined steel and the distance about 25 km.
What is total head required from the pump and what is the electrical power needed.
 
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  • #2
Is this homework? You will have to show what you've tried so far, because it's not ethical for us to simply solve the problem for you.

And you need to know what the elevation of the dam is too...
 
  • #3
Agreed with Mech. btw you're also going to need a pipe size for velocity and subsequent head loss calcs.
 

1. How do you calculate the required water pump size for a specific application?

To calculate the required water pump size, you need to know the flow rate required (in gallons per minute or liters per second), the total head or pressure required (in feet or meters), and the efficiency of the pump. These values can be determined by consulting a pump performance curve or by using a formula such as Q = (gpm x 500) / T, where Q is the flow rate, gpm is gallons per minute, and T is the total head in feet.

2. What factors affect the performance of a water pump?

The performance of a water pump can be affected by several factors, including the pump design, the type of impeller used, the size of the pump, the motor speed, and the efficiency of the motor. Other factors such as the type of fluid being pumped, the temperature and viscosity of the fluid, and the presence of any solids or debris can also impact pump performance.

3. How do you determine the total head or pressure required for a water pumping system?

The total head or pressure required for a water pumping system can be determined by considering the vertical distance the water must be lifted, the friction losses in the system, and the pressure required at the point of discharge. This can be calculated by using a formula such as H = (P1 - P2) / (ρ x g), where H is the total head, P1 is the pressure at the discharge point, P2 is the pressure at the suction point, ρ is the density of the fluid, and g is the acceleration due to gravity.

4. What is the best method for estimating the flow rate for a water pumping system?

The best method for estimating the flow rate for a water pumping system is by using a flow meter. This device measures the volume of water flowing through the system and provides accurate and real-time data. If a flow meter is not available, other methods such as measuring the size of the pipe, the velocity of the water, and the time it takes to fill a container can be used to estimate the flow rate.

5. How do you determine the efficiency of a water pump?

The efficiency of a water pump can be determined by comparing the amount of energy input (such as electricity) to the amount of energy output (such as the work done by the pump). This can be calculated by using a formula such as Efficiency = (Output energy / Input energy) x 100%. The efficiency of a pump can also be found on the pump's performance curve, which shows the relationship between flow rate, head, and efficiency.

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