Hydraulic rubber hoses are critical components in hydraulic systems, they can transfer hydraulic fluid in high-pressure systems. Proper use and maintenance of these hoses are essential to ensure the safety and efficiency of the hydraulic machinery.
In practical operation, improper selection, incorrect installation, misuse, and a lack of maintenance can all lead to hydraulic system failures. Therefore, understanding the proper precautions for using hydraulic hoses is crucial for extending hose service life, reducing maintenance costs, and ensuring the safe operation of equipment.
Here are some attentions to consider when using hydraulic rubber hoses:
Considerations for Selecting Hydraulic Rubber Hoses
When selecting hydraulic rubber hoses, one should adhere to the STAMPED guidelines; this helps in quickly identifying the appropriate hose model, size, and structure based on actual operating conditions, thereby preventing leaks, reduced service life, or safety incidents caused by improper selection.
- S — Size
Refers to the hose’s inner diameter, outer diameter, and length. Correct sizing ensures stable system flow and prevents pressure loss or issues regarding insufficient installation space. - T — Temperature
Includes both ambient temperature and the temperature of the conveyed medium. Excessively high temperatures accelerate rubber aging, while excessively low temperatures can cause the hose to stiffen and crack; therefore, it is essential to select a hose suitable for the specific temperature range. - A — Application
Refers to the equipment’s intended use and operating environment—for example, construction machinery, agricultural equipment, mining machinery, or scenarios involving high-frequency flexing. Different operating conditions impose varying requirements on the hose’s abrasion resistance, flexibility, and service life. - M — Material / Media
Refers to whether the hose material is compatible with the conveyed medium—such as hydraulic oil, water-glycol mixtures, air, or other fluids. Incompatible media can damage the inner liner and significantly shorten the hose’s service life. - P — Pressure
Includes working pressure, peak pressure, and impulse pressure. The hose’s rated pressure must meet the system’s requirements while also incorporating an adequate safety margin. - E — Ends
Refers to the specific types of fittings, thread standards, and sealing methods required for both ends of the hose—such as JIC, NPT, BSP, ORFS, flanges, etc.—to ensure a reliable and leak-free connection. Please make sure that it is crimped fully, using a crimping machine if necessary. Avoid using injurious or rusty joints. - D — Delivery
Refers to procurement quantities, assembly requirements, lead times, and packaging specifications; this factor is particularly relevant for bulk purchasing or OEM projects.
Hydraulic hose and fitting
Precautions for Hydraulic Hose Installation
After purchasing hydraulic hoses, there are numerous factors to consider during installation—such as bending, twisting, securing, and supporting—as any oversight in these areas can negatively impact subsequent maintenance and the overall service life of the hose.
1. Avoid Excessive Bending: Every hydraulic hose has a specified minimum bend radius. If the hose is bent too sharply during installation, it can lead to fractures in the internal steel wire reinforcement, cracking of the inner rubber lining, restricted fluid flow, and a shortened service life. Therefore, during installation, ensure that the bend radius is greater than the hose’s minimum allowable radius, allowing the hose to maintain a natural, unforced curvature.
2. Avoid Twisting During Installation: If a hose is twisted or rotated during installation, the internal steel wire reinforcement will be subjected to constant torsional stress. Over time, this can result in localized bulging, cracking of the outer rubber cover, or even a catastrophic hose burst. It is recommended to visually inspect the hose after installation to ensure that the printed alignment line runs in a straight, untwisted path.
3. Allow for Appropriate Slack: A hose that is either too long or too short is problematic. A hose that is excessively long can lead to significant pressure drops, while one that is too short may be prone to bursting under the stress of pressure pulses. Therefore, it is essential to select and install a hose with an appropriate, adequate length.
4. Consider the Surrounding Environment: When installing hydraulic rubber hoses, keep them away from areas involving high temperatures or sparks. Avoid direct contact with exhaust pipes, engine blocks, welding zones, or hot metal surfaces. If such contact is unavoidable, utilize heat-resistant sleeves, fire-retardant tubing, or similar protective measures as necessary.
5. Ensure Proper Securing and Support: If a long-span hose is left unsupported and allowed to hang freely, the resulting swinging motion can lead to vibration fatigue. It is recommended to utilize clamps, brackets, mounting clips, or similar fixtures to properly secure and support the hose.
Precautions for the Use of Hydraulic Hoses
1. Pressure Monitoring
Avoid exceeding the rated pressure for prolonged periods or subjecting the hose to frequent pressure spikes; sustained overpressure causes fatigue in the internal steel reinforcement, creating an extremely high risk of sudden hose rupture. Even if the hose can withstand such conditions for a short time, this does not imply it is suitable for long-term operation.
2. System Oil Temperature Control
The surface temperature of the hose (determined by both the fluid temperature and the ambient temperature) must remain within the permissible range (typically ≤ 80°C, though specialized hoses may tolerate temperatures exceeding 100°C). Excessive heat can accelerate material aging or lead to hose rupture.
3. Prevention of Frictional Wear
Prolonged contact between the hose and machine frames, metal plates, or sharp edges will rapidly abrade the outer protective layer. Once the internal steel reinforcement layer is exposed, it becomes highly susceptible to rapid corrosion. Regularly inspect the hose’s installation position and current physical condition.
4. Regular Inspection for Seepage and Leaks
Periodically observe the hose fittings for any signs of oil seepage, and check the hose surface for oil stains (as minute cracks may manifest initially through slight seepage). Minor leaks are often precursors to major system failures; regular inspections are essential for timely detection.
5. Immediate Shutdown Upon Detecting Anomalies
During operation, monitor for any unusual vibrations, pulsating noises, or abnormal hose twitching. Should any such anomalies—or visible defects such as cracks, bulges, outer layer peeling, or significant oil leakage—be observed, immediately shut down the equipment for inspection and, if necessary, replace the hydraulic hose.
Periodic Maintenance Considerations
Periodic inspections should be conducted on a monthly or quarterly basis to check for signs of aging or wear on the outer rubber layer, as well as for loose, corroded, or deformed connections.
Maintain surface cleanliness; accumulations of oil and grime can conceal cracks and potential leak points. Regular cleaning is recommended to keep surfaces clean and facilitate the early detection of issues.
Preventive Replacement: Do not wait for a hose to burst before replacing it. For high-intensity equipment, it is recommended to replace critical hoses according to a scheduled replacement cycle.The
Hydraulic Hose Storage Guidelines
Proper Storage Environment
- Temperature: 0°C to +35°C (ideally around 15°C).
- Humidity: Relative humidity ≤ 80%.
- Lighting: Store strictly away from light sources.
- Space: Clean, well-ventilated, ozone-free, free of ignition sources, and free from contact with corrosive gases or liquids.
- Storage Method: Classify and store hoses according to their specifications and models; use clear labeling to prevent accidental mixing.
Placement: Hoses should be stored in a relaxed state whenever possible; avoid stretching, hanging, or stacking them in piles. They may be coiled, provided that the inner diameter of the coil is no less than 15 times the inner diameter of the hose itself.
Protection and Isolation: It is recommended to cap or seal all hose ends to prevent dust ingress. Keep hoses away from sharp objects and avoid placing heavy loads on the hose bodies.
Inventory Management: Adhere to the “First-In, First-Out” (FIFO) principle. Mark the date of receipt upon warehousing and prioritize the use of hoses that have been in storage the longest. Record the expiration dates of the hoses; the recommended maximum storage duration is 2 years for hose assemblies and 4 years for bulk hose stock.
Core Principles: The essentials of hydraulic hose storage can be summarized into five key points: “Temperature Control, Light Exclusion, Moisture Prevention, Contamination Prevention, and Stress-Free Storage.” An ideal storage facility should be clean, well-ventilated, cool, and dry. Hoses that have exceeded their recommended storage duration must undergo pressure testing and verification prior to being put into service; they may be used only after passing these qualification tests.
By following these guidelines, you can ensure the safe and efficient operation of hydraulic systems while maximizing the service life of hydraulic rubber hoses.
Strongflex is a professional manufacturer of hydraulic hoses. If you have any requirements, you can contact us and we can provide you with specific hydraulic solutions and competitive prices. If you are not sure what kind of hose to choose, describe your situation and contact information to us and we will have a professional salesperson contact you.