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How To Buy A Pump

We understand that shopping for a pump can be a little bit intimidating, particularly when you have no experience of this type of product. 

In this section, we're going to help you to select the right pump by telling you what you’ll need to tell us. Buying the wrong pump, cheap or expensive, can be costly:  pumping more than you need it to (wasting energy), failing prematurely and damaging property and/or needing to be replaced. Knowing a few key pieces of information before you begin will save you time and make sure you spend your money on the right pump for the job. Giving us the wrong information often leads to problems.

 1. “I want to replace an existing pump”

 You’ll need to tell us about the pump you’ve

 a) . If so, have a look for the specification plate. Make a note of the manufacturer’s name and model number. Write down the voltage and as much other information that you can see.

 b) Try and remember how long it has been working. A few months or a few years? If it is only a few months it might not be the right pump for the job so we’ll need to know more about what you want it to do (see notes 2 onwards below). A few years old should mean it has worked satisfactorily.

 c) Has it been trouble free during its life? Try and remember if you’ve ever had to attend to it. What was the problem?

 d) If you can’t find a specification plate take a picture of the pump and email it to us.

 e) Once you have all the facts get in contact with our sales department.


 2. “I don’t have a pump to replace” 

 You’ll need to describe to us the work the pump will be doing

a) We’ll need to know how much liquid you want to pump, so you’ll need to estimate this (for example 1000 litres is the volume of liquid in an area of 1 metre high x 1 metre long x 1 metre wide). We’ll also need to know how quickly you want to pump the liquid out. We measure flow rate in litres per minute. 

b) We’ll need to know how high you want to pump (from the liquid level to the end of the pipe) and then how far along the ground. We measure distance in metres.

c) Do you want us to recommend a pipe diameter? We’ll select the correct pipe for the job and offer you an alternative depending on your budget.

d) If you are you using existing pipe, what material and diameter is it? (Some pipe material can slow pumping rates dramatically) We measure in millimetres.

e) Are there any elbows, T-pieces and valves in the pipe/required? Count them up.

f) We’ll need to know about the liquid.

        i)   Is it water or like treacle or something in between? (more viscous liquids require more powerful and sometimes different kinds of               pumps)

        ii)  What is the chemical make up? Are there hydrocarbons present? (Acidic or corrosive liquids and fuels/oils can damage certain                   pump materials).

        iii) What is the temperature of the liquid?

        iv) Does it contain solids? Are those solids soft and fragile? Are they hard and abrasive? (If so, they could wear down a pump made               from the wrong material) Do the solids need to be chopped up? Some pumps include a chopper mechanism. What size are the                 solids?


g) Think about how the pump will be powered?

         i)   Do you want to use electricity? If it is domestic use you’ll probably want 230volts, but we do supply pumps that work using                          110volts and 400volts for industrial users. We can also supply pumps in 12volt and 24volt DC for use with a battery.

         ii)  Do you want to use liquid fuel? Petrol and diesel are available but these pumps must be used outdoors.

         iii) Do you want to pump by hand? Rotary, lift and force and diaphragm pumps are available but performance is limited and can be                hard work if you’ve got a lot to pump or pumping up high. Good exercise though!

h) Think about what type of pumps you prefer? Submersible or surface?

“I’ve got all the information…what do I do now?”


When you have all this go to our shop, input your information and view the results! Alternatively, call or email our sales department on 01622 355000 or sales@obartpumps.co.uk

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