# You asked: How do you select a pump motor?

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When choosing a motor for a centrifugal pump, you must consider the impeller size, maximum capacity, specific gravity of the fluid, and service application in case API requirements apply. If you take these things into account, you will select the right motor for your centrifugal pump application.

## How do I choose a pump motor?

The power required to drive the pump at the rated design condition should always be less than the nameplate horsepower rating of the motor. So if the pump will require 4.5 HP at the design condition, at a minimum, the motor should be sized for 5 HP – the next nominal size above 4.5 HP.

## How do you size a pump motor?

Pump Hydraulic Power (ph) = (D x Q x H x9.

Pump Hydraulic Power (ph) = (1000 x 0.005 x 65 x9. 87)/1000 =3KW. Motor/ Pump Shaft Power (ps)= ph / pe = 3 / 80% = 4KW. Required Motor Size: ps / me =4 / 90% = 4.5 KW.

## How do I choose pump capacity?

1. TO CHOOSE A PUMP WE NEED TO KNOW 2 BASIC VALUES: FLOWRATE AND LIFT PRESSURE OR HEIGHT (OR HEAD)
2. A: area of the pipe π x (d/2)2 [m2]
3. v: speed of liquid (water) in the pipe [m/s]
4. Q:

## How do you select a motor for a particular application?

5 steps to choose the best motor for your application

1. Step 1: Know the load characteristics. …
2. Step 2: Get a handle on horsepower. …
3. Step 3: Getting started. …
4. Step 4: Adjust for duty cycle. …
5. Step 5: The last consideration, motor hypoxia.

3.12.2011

## How much horsepower do you need to pump water?

Horsepower theoretically required for pumping water equals the gallons per minute multiplied by the head in feet, and divided by 4.000 For power recommended, divide by 2000 instead of 4000.

## What is a pump size?

Pump sizing involves matching the flow and pressure rating of a pump with the flowrate and pressure required for the process. The mass flowrate of the system is established on the process flow diagram by the mass balance.

## What are the types of pumps?

There are three basic types of pumps: positive-displacement, centrifugal and axial-flow pumps.

Various positive-displacement pumps

• Rotary lobe pump.
• Progressive cavity pump.
• Rotary gear pump.
• Piston pump.
• Diaphragm pump.
• Screw pump.
• Gear pump.
• Hydraulic pump.

## How do you build a pump system?

The steps to follow to select a centrifugal pump are:

1. Determine the flow rate. To size and select a centrifugal pump, first determine the flow rate. …
2. Determine the static head. …
3. Determine the friction head. …
4. Calculate the total head. …
5. Select the pump.

## What size pump do I need to lift water 20 feet?

Example – Horsepower Required to Pump Water

Power Required to Pump Water (hp)
Volume Flow (gpm) Height (ft)
10 0.0126 0.0505
15 0.0189 0.0758
20 0.0253 0.101
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## How far can a 1 hp pump push water?

A 1/2 Hp pump should be able to push water up hill 40 ft without problems.

## How far can a 1 hp pump push water horizontally?

The pump at ground level acts as the source of vacuum and has a theoretical lifting capability of about 30 feet (It would lift 34 feet if it could create a perfect vacuum). In practice, 25 feet is all you should design a centrifugal or jet pump to lift in order to have adequate capacity left for water usage.

## How do you select a motor?

There are several characteristics that you need pay attention to when selecting a motor but voltage, current, torque, and velocity (RPM) are most important. Current is what powers the motor and too much current will damage the motor. For DC motors, operating and stall current are important.

## What is the cost of 1hp motor?

Kirloskar 1 HP Domestic Water Motor Pump Aqua – 100

M.R.P.: ₹ 6,250.00
Price: ₹ 5,562.00
You Save: ₹ 688.00 (11%)
Inclusive of all taxes

## How do you choose RPM for a motor?

How to Calculate Motor RPM. To calculate RPM for an AC induction motor, you multiply the frequency in Hertz (Hz) by 60 — for the number of seconds in a minute — by two for the negative and positive pulses in a cycle. You then divide by the number of poles the motor has: (Hz x 60 x 2) / number of poles = no-load RPM.