How to identify the size of a hydraulic hose

Identifying the size of the hydraulic hose is very important so hydraulic system’s do not have to be altered. To measure the size we can use two nomenclatures: Nominal diameter and Inches.

Hydraulic Hose Size

The Nominal Diameter: also known by its abbreviation DN, is the measurement in millimetres of the interior of the hose.

Inches:  this measurement of length comes from the English nomenclature. 1 inch equals 25.40 millimetres, also taking the inside of the hose as a reference.

Next, we show you a table that our professionals use daily in the facilities of HYNESUR. You only need a gauge to identify and compare in the table which hose is the one in front of you.

With this we can know what size of hose we have in front of us and therefore, we will know which press fittings we are going to need . In another article we will explain how to identify the thread of these press fittings.

Consequences of an error in the hose size:

– If we put a hose smaller than the one we must place, we will cause strangulation in the oil passage and we will increase the pressure drop and we will increase the heating and speed of the oil.
– If we put a hose with a larger internal diameter than the necessary one, we will cause the oil to pass slower, generating turbulence in the circuit that will affect it, causing noise and vibrations.

Types of Hydraulic Hose

As we have seen, we already have the size of the hose, but what type of hose is in front of us?

In a hose, if it is not very worn on the outside, we will find different labels with nomenclatures that will indicate what type it is. For example, “SAE 100 R2 AT DIN 20022 – 2SN EN 853” may appear. This tells us that it is a 2 wire mesh hose.

Normally the most used hose is the R2AT, a 2 wire mesh hose, which we see in the previous example. But obviously there are many types, where you can identify if it is 2 meshes, 4 meshes, if it is thermoplastic, etc.

Consequence of an error in the type of hose:

This is the most dangerous mistake, since the wrong application and designation of a hose can lead to the breakage of the hose and can put the lives of the operators at risk. We always recommend leaving their handling and manufacturing in the hands of professionals.

If you require more help with hose measurements you can visit the Hynesur website for more information and support, or take a look at their online hose catalogues.

Source: Hynesur

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