Just like most high-pressure washer components, hose choice is extremely important. This accessory has a substantial impact on the velocity and pressure of the water or fluid at the nozzle, and the machine’s overall performance. If you’d like to learn more about how to correctly size a high-pressure hose, this blog is for you.

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When selecting a high-pressure hose, you should consult an expert in the field who will be able to guide you through the below whilst considering your machine’s application:

1. The inner diameter of the hose for velocity of flow
2. Hose length for reach and upsizing purposes - ensuring that minimal pressure is lost due to friction and back pressure on longer hoses

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If your high-pressure hose is not sized correctly, this may lead to a drop in pressure, an increase in fluid temperature, and possible pump cavitation. In the long run, your high-pressure washer’s performance and longevity may be compromised. To avoid this, CEMSA has created a hose sizing guide so that the correct hose can be chosen for maximum high-pressure cleaning results with minimal losses. This guide is ideal for the sizing of hoses that are 30m and below. To size hoses longer than 30m, please refer to the second hose guide.

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To interpret the chart, you will need to identify the flow rate and pressure (bar) of the machine you are working with, which will lead you to whether your machine requires a H1 (R1) or H2 (R2) hose, or the colour the hose is situated on. In most cases, a R1 hose will change to a R2 hose once 260 bar, and 25 litres per minute is reached.

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The above chart works as follows. You will need to identify the size of your hose (inch) and the flow rate of your machine. This will lead you to a pressure drop value. From here, a high-pressure specialist will be able to guide you on upsizing your hose so that a pressure drop is prevented when using your machine.

CEMSA stocks a variety of high-pressure hoses, including normal black hoses varying in length and inches, and blue non-marking hoses that are best suited to food-processing, hospital and healthcare industries. We ensure that our machines are paired with the best of the best, with majority of them coming from MB Italia, in Italy.

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To learn more about our range of high-pressure hoses and how to accurately size yours to align with the pressure of your high-pressure machine, contact us or your nearest distributor today.