Euroflo Pump FAQ’s & Troubleshooting

We have a wealth of knowledge in pumping and have an in-depth knowledge of the typical problems that could arise from submersible & diesel pumps.  Here is an ever growing list of frequently asked pumping questions. However, feel free to request a parts manual or speak to our technical team on 0800 111 4980.

What is the difference between single phase and three phase motors?

The difference between three phase and single phase is primarily in the voltage that is received through each type of wire. There is no such thing as two-phase power, which is a surprise to some people. Single-phase power is commonly called “split-phase.” You have some ways to determine whether you have three-phase wire or single-phase wire.

Single Phase

Single-phase wire has three wires located within the insulation. Two hot wires and one neutral wire provide the power. Each hot wire provides 120 volts of electricity. The neutral is tapped off from the transformer. A two-phase circuit probably exists because most water heaters, stoves and clothes dryers require 240 volts to operate. These circuits are fed by both hot wires, but this is just a full phase circuit from a single-phase wire. Every other appliance is operated off of 120 volts of electricity, which is only using one hot wire and the neutral. The type of circuit using hot and neutral wires is why it is commonly called a split-phase circuit. The single-phase wire has the two hot wires surrounded by black and red insulation, the neutral is always white and there is a green grounding wire.

Three Phase

Three-phase power is supplied by four wires. Three hot wires carrying 120 volts of electricity and one neutral. Two hot wires and the neutral run to a piece of machinery requiring 240 volts of power. Three-phase power is more efficient than single-phase power. Imagine one man pushing a car up a hill; this is an example of single-phase power. Three-phase power is like having three men of equal strength pushing that same car up the same hill. The three hot wires in a three-phase circuit are coloured black, blue and red; a white wire is neutral and a green wire is used for the ground.

Can my submersible pump be COMPLETELY underwater?’

Yes. If the pump is labelled “submersible” then the whole pump and cord can be put under water. The only thing that must not be submerged is the plug and the power source.

What kind of hose or pipe is best to use for discharge from this pump?’

It is best to use a hose or pipe that is the same size as (or larger than) the pump’s actual discharge. Using a reducer, smaller hose, or smaller pipe, will reduce the output of the pump. If reduced too much, the pump can even be damaged.

What is meant by head and static head?

Static head measures the total vertical distance that a pump raises water. It has two components: static lift and static discharge. Static lift measures the elevation difference between the water source and the pump, while static discharge measures the elevation difference between the discharge point and the pump.

When would I need a 50Hz and 60 HZ pump?

HZ is short for Hertz, which is the unit of an international standard unit of frequency of an alternating current voltage. 50HZ means the voltage alternates 50 times per second and the 60HZ means it alternates 60 times a second.

In short, the answer depends on the power supply where the pump is being used, UK and Europe generally have a 50HZ power supply, but Americas and other parts of the world use 60HZ. It is important to match the pump to the power supply to the pump operates at it.

What kind of hose or pipe is best to use for discharge from this pump?

It is best to use a hose or pipe that is the same size as (or larger than) the pump’s actual discharge. Using a reducer, smaller hose, or smaller pipe, will reduce the output of the pump. If reduced too much, the pump can even be damaged. There are many different types of hose that we supply depending on your application.

Why does the PH range of my pump matter?

The Ph range matters because certain liquids are corrosive and the pump will not last as long in some environments. For example, the Ph value of salt water is different from that of clean water. This will be detrimental to the life of the pump. To get around this you could use a different type of pump – for example, a stainless steel one, or change the materials of the pump such as the seals. You can also use zinc anodes which will prolong the life of the pump.