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High-temperature hydraulic hoses are widely used in fluid transmission systems in High-temperature working environments such as engineering machinery, metallurgy, chemical industry, aerospace, energy, and electricity. Because they need to withstand extreme temperatures, pressures, and complex working conditions, appropriate safety measures must be taken during use to ensure the stability, reliability, and long-term operation safety of the system. This article will explore in depth the precautions for the safe use of High-temperature hydraulic hoses in High-temperature extreme environments to help users optimize usage plans, reduce risks, and improve the overall efficiency and service life of the equipment.
1. Characteristics and challenges of High-temperature hydraulic hoses
Basic characteristics of High-temperature hydraulic hoses
High-temperature hydraulic hoses are usually composed of High-temperature resistant synthetic rubber, a metal reinforcement layer (such as a stainless steel wire braided layer or spiral winding layer), and an outer protective layer. Its design mainly considers:
High-temperature resistance: Able to withstand working temperatures of 150℃~250℃ or even higher.
High-pressure resistance: Able to adapt to hydraulic pressures up to tens of MPa.
Corrosion resistance: Able to resist erosion by oils, chemical media, and oxidizing environments.
Flexibility and fatigue resistance: Maintain good bending and stability in complex piping systems.
Challenges of High-temperature extreme environment
High-temperature extreme environments usually include:
Continuous High-temperature operation: such as near the furnace of a metallurgical plant, steelmaking equipment, around a High-temperature engine, etc.
Severe temperature changes: such as sudden cooling and heating conditions, such as aircraft engines or thermal systems.
High pressure and impact pressure: Long-term exposure to high pressure and sudden pressure pulses may cause hose failure.
External environmental influences: such as flames, chemical corrosion, mechanical wear, etc., will accelerate the aging of hoses.
Due to these challenges, it is crucial to reasonably select and safely use High-temperature hydraulic hoses.
2. Precautions for safe use of High-temperature hydraulic hoses
Choose High-temperature hydraulic hoses that meet the standards
In High-temperature extreme environments, it is crucial to choose the right hose, and the following points should be noted:
Confirm the temperature level: The temperature tolerance of the hose must meet or exceed the actual working temperature. For example, general hydraulic hoses can withstand 100°C, while special High-temperature resistant hoses can withstand 200°C or even higher.
Check the pressure level: Make sure that the working pressure and burst pressure of the hose meet the requirements of the hydraulic system.
Choose corrosion-resistant materials: such as synthetic rubber, fluoro rubber (FKM), polytetrafluoroethylene (PTFE,) and other high-temperature and corrosion-resistant materials for the lining.
Follow industry standards: such as ISO 18752, SAE J517, and DIN EN 853/856 standards to ensure the quality and reliability of the hose.
Correctly install and arrange the hose
The following principles should be followed during installation:
Avoid excessive bending: Too small a bending radius will cause premature damage to the hose. It is recommended to follow the minimum bending radius recommended by the manufacturer.
Reduce stress concentration: Avoid excessive tension or twisting force on the hose at the connection to reduce fatigue damage.
Keep away from high-temperature heat sources: Whenever possible, try to avoid direct exposure of the hose to flames or high-temperature surfaces. Use thermal insulation sleeves or high-temperature protective materials.
Reserve expansion space: The hose may be displaced due to thermal expansion or system vibration at Temperatures, so appropriate installation margins should be left.
3. Take High-temperature protection measures
In extremely High-temperature environments, additional protection measures must be taken to extend the life of the hose and improve safety:
Use High-temperature resistant sleeves: such as glass fiber braided layers, silicone sleeves, or metal braided protective layers to reduce the direct impact of heat on the hose.
Add thermal insulation barriers: set up insulation boards or heat reflective materials between the hose and the High-temperature heat source to reduce the impact of ambient temperature.
Ventilation and heat dissipation design: keep air circulation around the hose to avoid heat accumulation.
Avoid oil oxidation: High temperature can easily accelerate the oxidation and deterioration of hydraulic oil. You can choose oil with a strong antioxidant ability to reduce corrosion to the hose.
4. Regular inspection and maintenance
In High-temperature environments, the aging speed of hoses is accelerated, so daily inspection and maintenance must be strengthened:
Regularly check the appearance of the hose: if cracking, swelling, hardening, surface peeling, etc. occur, it needs to be replaced immediately.
Check the sealing of the joints: High temperature may cause the joint threads to loosen or the sealing ring to age, affecting the sealing of the system.
Monitor pressure changes: avoid hoses being in high pressure or overload for a long time to prevent sudden leakage.
Replace the hose regularly: Even if the hose looks normal, it is recommended to replace it regularly according to the service life recommended by the manufacturer to reduce the risk of failure.
5. Emergency measures for handling sudden failures
In High-temperature environments, if the hydraulic hose leaks or ruptures, the following emergency measures should be taken:
Immediately stop the machine for inspection: Avoid splashing High-temperature and high-pressure liquids that may cause equipment damage or personal injury.
Use protective equipment: Maintenance personnel should wear protective equipment such as High-temperature resistant gloves and protective glasses to avoid contact with High-temperature liquids.
Cooling treatment before replacing the hose: Ensure that the system pressure is released and wait for the hose to cool before repairing.
Use matching replacement parts: When replacing, High-temperature hydraulic hoses and connectors of the same specifications should be used to ensure sealing reliability.
When using hydraulic hoses in High-temperature extreme environments, it is necessary to comprehensively consider factors such as temperature, pressure, materials, installation methods, and maintenance management. Through reasonable selection, correct installation, enhanced protection, regular maintenance, and emergency management, the service life of the hose can be effectively improved and the safe and stable operation of the hydraulic system can be guaranteed. The safe use of High-temperature hydraulic hoses not only affects the performance of the equipment, but also directly affects the safety of the operation, so any operation link cannot be taken lightly. If your application involves extreme High-temperature environments, it is recommended to consult a professional hydraulic engineer or hose manufacturer to select the most suitable solution to ensure safety and efficiency.
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