Hydraulic Hose mainly functions to convey hydraulic fluids from one point to another, and the Pressure a specific hydraulic hose can withstand differs due to the reinforcement structure of the hydraulic hose. working pressure vs burst pressure is crucial for selecting the right hose, hydraulic pressure rating chart introduces the normal relations between the reinforcement and the pressure rate they can endure individually.
Hydraulic hose pressure rating is the most important concept for hydraulic hoses, which leads to their application. Working pressure, Burst Pressure, Safety Factor, and proof test pressure are crucial indicators that state the property of a specific hydraulic hose, Let’s dive in.
What is the working pressure of a hydraulic hose?
The working pressure is the highest amount of pressure that the hose assembly will operate under, including spikes.
Working pressures are what should be used when designing a hose into a system, not the burst pressure.
When you want to choose or replace a suitable hydraulic hose for your machine, you must know the maximum pressure when it is working, if not, you should consult your equipment supplier. and make sure the working pressure of the hydraulic hose you opt for is above the required (including the spike pressure).
But note that the working pressure of your hydraulic assembly does not only come from the hose working pressure, it is determined by the minimum component in the hydraulic assembly, so you have to take the hydraulic fittings, and adapters into account. These components must be compatible and supply comprehensive safe performance.
What is the burst pressure of a hydraulic hose?
The burst pressure for a hydraulic hose is what the manufacturer offers as the maximum pressure before a particular hose will generally explode or have a rupture in it.
What is the safety factor?
The safety factor is the ratio between bursting pressure and working pressure, It offers the guarantee for high safety requirement and is the key indicator for some engineering application, For example, elevator is popularly used in urban areas, and everyone who takes them feels safe because they have a high safety factor, The common safety factor used for elevator support cables is 11.
The safety factor of a normal hydraulic hose is 4, which is stipulated in the SAE J517 Standard. So if your working pressure is 2000 PSI, the minimum burst pressure would be 8000 PSI, but you should never push the hose beyond the recommended working PSI limit.
Working Pressure vs Burst Pressure
More emphasis goes to the working pressure when talking about hydraulic hose pressure, like in the above chart. But the working pressure rating isn’t the only critical rating you should check for. You should also consider the hose burst pressure, primarily if you work with high-pressure fluids.
Working pressure has to do with how much pressure a hydraulic hose can handle to operate optimally. But burst pressure has to do with how much pressure a hydraulic hose can withstand before it breaks — or bursts.
Burst pressure is usually much higher than the working pressure. This means that much more pressure is needed to damage a hydraulic hose than to function as it should.
For example, if the working pressure of a hydraulic hose is 2,000 PSI, the burst pressure will be at least 8,000 PSI — about four times the working pressure. Some hydraulic hoses also have a burst pressure of up to six times the working pressure.
When selecting a hose to use with your hydraulic systems and fittings, the working pressure is what you should consider.
All Sinopulse hydraulic hoses offer 4:1 safety factors and adhere strictly to the SAE J517 Standard, even though many products exceed the standards far away.
Dynamic Pressure vs Static Pressure
Dynamic Pressure means your hydraulic system has a pulse, pressure fluctuations, and temperature changes in the application, like a crane in its working status, a hydraulic pump pushes the hydraulic power into the hydraulic fluid periodically, which raises hydraulic pressure fluctuation in the hydraulic hose.
Static Pressure means the hydraulic pressure in the hydraulic hose is constant and has no change. like the hydraulic support in the mining roadway. it prevents the roadway from collapsing with constant pressure support.
what is the proof test pressure of a hydraulic hose?
When the manufacture of each bulk of hydraulic hose finishes, a proof pressure test is a must-do in Sinopulse’s workshop, each hydraulic hose is fixed on the pressure test apparatus, and gradually increasing water pressure was conducted into the hose when the pressure was up to the twice of its’ working pressure, maintain this pressure between 30 to 60 seconds, if no leaks, this hose passed the proof test.
Final thought
In this article, I try to explain these important pressure concepts in choosing a suitable hydraulic hose, beside the proof pressure test after each bulk was completed, we also conduct impulse tests in the laboratory periodically, The hydraulic assembly receives hundreds of thousands of impulse cycle at a specific pressure (twice working pressure), what we have done ensure the quality of the product, that is the reason we are accepted as reliable hydraulic hoses supplier by many clients.
if you have any problem with the hydraulic hose, please feel free to contact us.