Special Hydraulic Hose

Firstly, you should consider the conditions that a special hydraulic hose will operate under. The outer layer or cover of a hose can come in a variety of synthetic rubber materials. Some compositions can help with applications where abrasion may occur but may not bend as readily.
The most common materials are fluoropolymers and silicone, elastomers, metal, and thermoplastics. Composite or laminated materials are also common.
Rubber and elastomeric special hydraulic hose are a strong choice when you need flexibility. A fluoropolymer hose has a durable flex life, it also has excellent corrosion and chemical resistance and it can handle high temperatures.

Another consideration when selecting a special hydraulic hose would be whether the weight and space are a concern, as is often the case with mobile machine. In this instance you would want to look for hoses with a thin-wall inner tube. Advances in synthetic rubber compounds allow for higher wall strength, allowing for a final product with a smaller outside diameter. Some manufacturers have moved to a reinforcement wire with an oval cross-section, as opposed to round, offering additional outside diameter (o.D.) and hose weight savings. These smaller o.D. Hoses, referred to as compact models in many catalogues, also offer much tighter bend radiuses.

It's very important to use a special hydraulic hose of the correct inside diameter. If the diameter is too small for a given rate of flow, the linear velocity will be too high and excessive velocity will translate into friction and turbulence, which when combined will surely result in noticeably higher system pressure and heat.
Correct hose length needs to allow for bending and flexing as a machine moves and articulates, and to make sure that no undue stress is caused at the crimped fittings. A hose that connects in a perfectly straight path from one component to another may shrink in length up to 4% at maximum pressure, so an allowance of extra length should be considered when making up the hose assembly. However, an excessively long hose adds restriction to flow, increasing system pressure and reducing system efficiency. A long hose length also requires a larger inner diameter to avoid excessive restriction and friction.

A hose must be chosen with a maximum working pressure (wp) rating that is at or preferably above the normal maximum hydraulic system pressure. Momentary pressure surges for a hydraulic system are not to exceed this pressure rating. Hose fittings that are rated below the working pressure of the selected hose cause the entire hose assembly to be aligned to the lower rating of the fittings.
Burst pressure is a built-in safety factor for a special hydraulic hose. A hose manufacturer verifies the burst pressure in a destructive test. The hose does not have to violently break apart completely to have suffered a burst failure. The burst pressure rating of a special hydraulic hose if often 4x the working pressure rating or greater.

When it comes to hydraulic design, hoses are not minor parts. Using economics as the only/primary hose selection criteria can easily leave human risks at a very high level. A special hydraulic hose burst failure is always a catastrophic incident. In the best case scenario, a hose failure might cause production downtime or environmental contamination concerns. In a worse scenario, persons could be seriously injured or even killed.