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25 JANUARY 2019

If you need to remove water clogged with mud, sand or other debris, a standard diesel pump won't cut it. You need to hire a trash pump that's specially built to handle thick, sludgy water.

These pumps are usually portable, making them easy to set up and move around your site. Learning how trash pumps work will help you to choose the right type of your dewatering needs.

When do you need a trash pump?

Standard petrol and diesel water pumps are designed to pump water that's relatively clear. If you use them to pump contaminated water filled with sand, soil or solid objects, this can affect their performance or even cause the pump to clog or the motor to break down, requiring expensive repairs or replacement.

Centrifugal trash pumps are robust machines that can handle solids like pebbles, twigs, leaves and sewage with ease, taking care of your dewatering problem and preventing flooding.

How do they work?

Trash pumps suck in dirty water, separate the contaminants, then eject this filtered water out the other end. The method of separation depends on the type of trash pump you're using.

Portable trash pumps use centrifugal force to create an area of low pressure that draws up the water, while diaphragm pumps create an air vacuum. Any solid matter that remains inside the pump is siphoned through an impeller before the water's ejected.

Trash pumps can run on diesel, petrol or 240V electricity.

What are the different types of trash pumps?

  1. Semi-trash pumps – suitable for water that's only slightly muddy or sandy, these less powerful pumps can handle light dewatering applications, but could run into problems if stones or other objects larger than 15mm are present.
  2. Centrifugal pumps – the most common type of pump, small trash pumps are portable and can handle solids up to 25mm, though larger models can cope with debris up to 100mm. They have deeper impeller vanes and discharge openings than other types of dewatering pumps.
  3. Diaphragm pumps – larger than centrifugal pumps, air diaphragms come in sizes from 25mm-75mm, with air-driven submersible pumps also available. They're usually employed for draining ponds, sewage and chemical-contaminated water.

The type of water pump you choose should depend on the type of water you need to remove, as some can handle harder debris than others. There are three types of trash pumps:

What to look for in a trash pump

Whichever option you choose, there are a few questions you should ask yourself or your supplier to make sure you hire the right pump for your needs, such as:

  1. Is it the right size for your pumping needs?
  2. Do you need it to be portable?
  3. What's the maximum flow rate and pressure?
  4. Do you want an electric, petrol or diesel pump?
  5. Is it self-primed or capable of running dry?
  6. Do you need any pump accessories?

Hire portable trash pumps today

Coates Hire has the largest pump hire fleet in Australia, whatever your dewatering or drainage needs. Browse our pump range or get in touch with your local Coates Hire branch to find the right pump for you. Find your local branch.


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