Overview of Hydraulic Hose

A hose can be defined as a flexible tube hollow from inside designed to carry fluids from one location to another. The shape of a hose is usually cylindrical which has a circular cross-section. Hydraulic hose is graded by pressure, temperature, and fluid compatibility.

Hoses are used when pipes or tubes can not be used, usually to provide flexibility for machine operation or maintenance. The hose is built up with rubber and steel layers. The exterior is designed for abrasion resistance. Careful consideration has been given while designing the bend radius of the hydraulic hose.

This is due to the fact that hose failures can be deadly. Hydraulic hoses generally have steel fittings that are held on to the ends. This is considered to be the weakest part of the hose and thus considerations should be given while installing or removing the fitting.

Material Used in Developing Hydraulic Hose

Hoses are made from one or in some cases many different materials. The most general material used to make a hose is nylon, polyurethane, polyethylene, PVC, or synthetic or natural rubbers, based on the environment and pressure rating needed.

Besides, Certain hoses on the basis of their applications can also be manufactured from special grades of polyethylene (LDPE and especially LLDPE). Other hose materials include PTFE (Teflon), stainless steel and other metals.

Tips to choose the right Hydraulic hose

#1)Working Pressure

The hydraulic system pressure should not exceed the rated working pressure of the hose. Keep a check on the Pressure surges or peaks which exceed the rated working pressure as they can be destructive for a hose.

#2) Minimum Burst Pressure

Burst pressures are pressures referred to in this catalog which were intended for destructive testing purposes and for design safety factors only.

 #3)Temperature Range

Keep the hose safe from any internal or external temperatures exceeding the specified limits. Make sure to check the technical data when hydraulic fluids contain emulsions or solutions. The fluid manufacturer’s recommended maximum operating temperature for any given fluid must not be exceeded, regardless of the hose temperature range.

#4) Fluid Compatibility

The hydraulic assembly (tube, cover, reinforcement, and couplings) must be fluid compatible. The correct hose must be used because phosphate ester and petroleum-based hydraulic fluids have drastically different chemical characteristics. Many hoses are compatible with one or the other but not all fluids. For example, Gates extreme Heat G2XH hose is capable of handling phosphate ester and petroleum-based hydraulic fluids.

#5) Minimum Bend Radius

Do not bend or flex hose to a radius smaller than the minimum recommended and do not subject hose to tension or torque. This can place excessive stress on the reinforcement and severely reduce the ability of the hose to withstand pressure.

#6) Hose Size

Hose size (inside diameter) must be capable of handling the required flow volume. Too small an I.D. for a given volume of flow results in excessive fluid pressure and heat generation which can result in tube damage.

#7) Hose Routing

Make use of clamps to restrain, protect or to guide hose, and also to minimize the risk of damage because of any excessive flexing, whipping or any contact with other moving parts or corrosives. Determine hose lengths and configurations that protect from abrasion, snagging or kinking and provide leak-resistant connections.

#8) Hose Length

The length of the Hose should include considerations for length in the case of any changes under pressure, hose assembly routing machine vibration and motion.

#9) Hose Applications

Select the proper hose for the application. Suction applications (Gates GMV or G4H) and special fluid or high-temperature capabilities are among the applications requiring particular consideration and a specific hose. When additional information is required, contact your local representative.

Safety Tips While Using the Hydraulic Hose

• Receive hands-on training with Gates’s recommended equipment.
• Follow current Gates operating manual and crimp data.
• Use only new (unused) Gates recommended hose and fittings with Gates crimpers.
• Wear safety glasses.

Select and Install Assemblies With Caution

• Select proper hose assemblies for the application. Many factors and conditions affecting the inside and outside diameter of the hose must be taken into account.
• Hose assembly routing should be able to prevent any injury hazard or damage to the hose.
• Select hydraulic components so that the application’s temperature, pressure and bend radius does not exceed recommended component limits.
• The hose must not be stretched, kinked, crushed or twisted during installation or use. The hose must not be bent to less than the minimum bend radius.
• Do not use the hydraulic hose to transmit high-pressure gases.

Hydraulic Hose Maintenance Practices

1. Establish a program of inspection, testing, and replacement of hose assemblies from factors including Severity of application, frequency of equipment use, past performance of hose assemblies.

2. Only properly trained persons should inspect, test or service hose assemblies. Update training periodically.

3. Avoid fuel injection injuries. Fluid under pressure can cause serious injury. It can be almost invisible escaping from a pinhole, and it can pierce the skin into the body. Do not touch a pressurized hydraulic hose assembly with any part of your body.

If fluid punctures the skin, even if no pain is felt, a serious emergency exists. Obtain medical assistance immediately. Failure to do so can result in loss of the injured body part or death.

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