How to determine the correct insert for your drain jetting nozzle?

Depending on the nozzle you are using, the number of inserts will change. You can check each nozzle to determine the number of inserts and or plugs that you will require.

Each insert acts like a normal water nozzle that allows a certain amount of water to exit the nozzle at a certain pressure. The higher the pressure the more water will exit the nozzle. We refer to nozzle sizes in two different formats. The first is in millimetres and the second is FP. The FP is the standard sizing system used in your ¼ Meg nozzles, for example ¼-25045 where the 45 is the nozzle FP.

Using FP makes sizing multiple nozzles easier as you can simply add and subtract the total FP size to reach the correct size for the pump in use. An example of this is that two 03 nozzles displace the same amount of water as one 06 nozzle.

You can use the formula provided on page 50 to work out the total FP required for your nozzle. Depending on the nozzle you using you can then decide how much of the machines’ flow you want working either forward, backwards or out the sides of your nozzle. You will often need to plug certain holes to assist the nozzle to rotate correctly or simply to reach the correct total FP.

As with a standard pressure cleaner you will always make the nozzle size slightly smaller than the formula allows for, of course when using a long hose, this might need to be increased higher than the FP to compensate for back pressure.

If you have any concerns or questions when sizing your nozzle just give us a call!