high pressure water pump

Water Pumps, Transfer Pumps, Trash Pumps and Chemical Pumps explained!

There are many types of pumps around, including high pressure water pumps and each type has a particular function, unfortunately there is no one pump to suit every need. As a very basic description pumps are used to transfer liquid from one location to another. Whether you are clearing a large area of water on the farm or construction site, draining flood water from the house or fighting a fire with a high pressure water pump. 

Pump Categories

Pumps can be broken into four main categories. Below we explain the difference between each pump category.

High Pressure Water Pump

High pressure water pumps are designed to provide water under pressure.  They are designed to be used as fire fighting pumps, to run sprinkler systems or any other application where high water pressure is required.  Typically high pressure pumps come with either a single impellor or dual impellors.  The difference between the two is “head height”.  The “head” of a pump refers to the vertical distance that the pump can push water.  A single impellor 1.5” might have a head of 55 metres where as a dual impellor pump would be 75 metres.  The higher the head height the higher the pressure the pump can develop.

Transfer Pump

A transfer pump is specifically designed to shift water from one source to another.  They are not designed to withstand any back-pressure.  Typically they will have a cast iron impellor.  Their flow rates will be higher than a hi pressure pump.  Tranfer pumps are the most common pumps used in agricultural and domestic applications 

Trash Pump

A trash pump is similar to transfer pump in that it is designed to shift large volumes of water with no back pressure.  The key difference with a trash pump is that it can tolerate particulate matter.  A 3” trash pump can often accept solids up to 25mm.  It achieves this by having a very large cast impellor with large clearances to allow the solids to pass through it without damaging the impellor.  Trash pumps will often have a quick release front cover that can be easily removed if a blockage occurs..

Chemical Pump

Chemical pumps typically have a plastic housing and internals that can withstand chemical corrosion.  They generally use an open style impellor that is designed to shift volumes of liquid at low pressure. Can come with petrol or diesel engines.

So now that you know the difference and purpose of each pump, how do you choose the right pump for your application? Understanding the specifications of each pump will help.

Understanding water pump specifications

When choosing a pump for your application there are four key specifications to understand.

Flow rate

The flow rate of the pump simply refers to how fast the pump can transfer water or liquid in litres per hour. As a general guideline for home use, a flow rate of 18,000 litres per hour is usually sufficient. A water transfer pump for farm use, eg transferring water from one dam to another, might need a flow rate of 30,000 – 50,000 litres to get the job done faster. 

Inlet size

The inlet size refers to the circumference of the inlet, ie where the hose will connect to the pump. Grudge pumps generally range in size from 1.5 inches through to 4 inches. Generally the larger the size the faster the job gets done. As an example a water pump with a 3 inch inlet will transfer water 3 times faster than a water pump with a 1 inch inlet. 

Maximum head and pressure

As mentioned earlier, the maximum head of a pump refers to the maximum vertical distance that the pump can push water from the water source.  The higher the head height the higher the pressure the pump can develop.

Engine type and size

You can choose between petrol and diesel engines, this can be a personal preference or can be dependant on the engine type you currently have for other machinery on your property. As a rough guide diesel engines are generally 20-30% more efficient than the equivalent petrol engine. While petrol engines can deliver more peak power, diesel engines can produce more low rpm power. 

Grudge Pumps are all built with a steel cage for durability and roll protection. We stock a large range of spare parts for all pumps in our range and have mechanical staff on hand to answer any questions regarding the type and operation of your pump. If you need assistance choosing the right pump contact the guys today on 1300 478 343 or send us a message.