pressure loss

Pressure at the nozzle

1. Pressure Loss

The pressure losses up to the nozzle can only be estimated, because it is not a constant process. With the help of tables provided by the hose manufacturer a benchmark can be calculated.

2. Pressure at the nozzle

The estimated net pressure at the nozzle is the result of maximum pump pressure minus total pressure loss from the pump to the nozzle (the pipe system).

3. Orifices The theoretical available pressure at the nozzle together with the flow performance allows the selection of suitable nozzle orifice sizes.

The cleaning tool is not subject to any changes and is the most accurate part in the system.

Measuring the pressure loss on the vehicle:

Measure the pressure loss on the vehicle:

1. Switch the vehicle without the nozzle on the hose to the maximum flow.

2. The measured pressure at the pump corresponds to your pressure loss.

3. Select the nozzle opening size using the pressure chart with the data.

Calculating the net pressure sample

To find the required nozzle orifice size, use your values of liters per minute and the calculated net pressure in the diagram. Our Extra Prime nozzles are all calculated with a flow rate of 100 bar.


This table contains average values. Please talk to your hose supplier about exact values.

calculating the pressure at the nozzle

1. Draw a horizontal line at the flow rate of the pump.
2. Draw a vertical line at the calculated pressure on the pump.
3. When you merge both values, you get the correct nozzle size. If you can not hit a line, you are on the safe side with a lower pressure. If you´re in doubt, please contact your Duebre dealer.
4. Replace XXX on the article with liter per minute at 1 00 bar. For example: 3804-G1 80 equals 1 80 liter per minute at 1 00 bar.
per 10 meter (32.8FT) in plastic hose. rubber estimate plus 5-20%,