How To Flush Hydraulic Tubes?

During the use of hydraulic tubes, due to long-term operation, certain impurities and sediments will accumulate in the pipes. These will affect the normal operation of the hydraulic system. Therefore, regular pipe cleaning is very necessary.

‌Process flow and parameters of hydraulic tube flushing‌:

‌1. Flushing flow rate

Calculate according to the pipe diameter and loop form to ensure that the oil flow in the pipeline is in a turbulent state, and the flow rate should be above 3m/s‌.

‌2. Flushing pressure‌

The pressure during flushing is 0.3~0.5MPa, and the pressure is increased every 2 hours. The pressure is 1.5~2MPa, running for 15~30 minutes, and then returning to the low-pressure flushing state‌.

‌3. Flushing temperature‌

Use a heater to heat the oil temperature in the oil tank to 40-60℃. The oil temperature can be increased to 80℃ in winter to improve the flushing effect‌.

‌4. Vibration‌

Use a wooden hammer, copper hammer, rubber hammer or vibrator to knock and vibrate along the pipeline every 3-4 hours, especially at welds, flanges, reducers, elbows and tees.

‌5. Inflation‌

Infuse 0.4~0.5MPa of compressed air into the pipe to create a turbulent state of flushing oil in the pipe and enhance the flushing effect‌.

Hydraulic tube flushing methods mainly include the following methods‌:

‌1. Pumping cleaning‌

The cleaning liquid (such as chemical cleaning agent, water, gas, etc.) is sprayed into the pipeline at high speed through a pump, and the impurities inside the pipeline are flushed out by high-speed liquid flow. This method needs to consider the composition and injection pressure of the cleaning liquid to avoid damage to the pipeline‌.

‌2. Gas cleaning‌

Use high-pressure gas (such as nitrogen or compressed air) to discharge impurities inside the pipeline. This method needs to consider the pressure, flow rate and flow rate of the cleaning gas, as well as the nature and state of impurities inside the pipeline‌.

‌3. Mechanical cleaning‌

Remove impurities from the pipe by mechanical equipment (such as pipe brushes, steel wool, etc.). This method needs to consider the diameter, hardness and shape of the cleaning equipment, as well as the nature and state of impurities inside the pipe‌.

4. Chemical cleaning‌

Decompose impurities inside the pipe by chemical reaction. Commonly used chemical cleaning agents include acids, alkalis, etc. This method needs to consider the composition and concentration of the cleaning agent, as well as the nature and state of impurities inside the pipe‌.

‌5. Hot water cleaning‌

Flush impurities inside the pipe by heating water. This method needs to consider the temperature, flow rate and flow rate of the water, as well as the nature and state of impurities inside the pipe‌.

‌6. Oil flushing‌

Includes station circulation flushing and station circulation flushing. Flushing flow, pressure, temperature and other parameters need to be calculated according to the pipe diameter and loop form to ensure that the oil flow in the pipeline is in a turbulent state, and the flow rate should be above 3m/s. Vibration and inflation are also required during the flushing process to enhance the flushing effect‌.

‌7. Pickling‌

Including tank pickling method, immersing the pipe in the pickling liquid in the pickling tank for pickling. This method requires the preparation of acid, neutralizing liquid and passivation liquid, and ensure that the pipe is immersed in the pickling tank for a sufficient time‌.

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Precautions for hydraulic tube flushing:‌

1. In all procedures, the direction of the oil must be clear, and the flow rate and flow rate of the oil through the pipeline must be calculated to form turbulence‌.

2. During the flushing period, in order to ensure the authenticity of the results, oil samples must be taken at the specified location‌.

3. Ensure that the oil temperature and flow rate are correct. After the flushing starts, 24 hours of continuity should be ensured until the system flushing reaches the required cleanliness‌.

Summary

Different hydraulic tube cleaning schemes have their own advantages and disadvantages. It is necessary to choose the appropriate cleaning method according to the specific situation. If the dirt in the specified pipe is difficult to clean, you can try a combination of multiple cleaning schemes. During the cleaning process, you need to pay attention to protecting the environment and avoid affecting the surrounding environment. At the same time, protective equipment such as protective gloves and glasses need to be worn during the cleaning process to ensure personal safety.