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The precautions for double mechanical seal for pump mainly include correct material selection, standardized installation, regular monitoring of isolation fluid status, ensuring smooth flushing and cooling system, and timely replacement of vulnerable parts. These measures can significantly improve sealing reliability, prevent leakage, and extend service life.
1. Background
double mechanical seal for pump form a dual barrier through two pairs of sealing end faces, with isolation fluid (such as lubricating oil or buffer fluid) introduced in the middle to achieve safe sealing of high-pressure, toxic, volatile or corrosive media. Due to its complex structure and frequent use in critical equipment, special attention should be paid to operation and maintenance details during use.
2. Key points of use and maintenance
a. Preparation and operation specifications before installation
Cleaning treatment: Before installation, the rotating shaft and sealing chamber must be thoroughly cleaned to avoid impurities scratching the sealing surface.
Chamfering protection: All non-metallic components sliding over the shoulder should be chamfered and rounded to prevent damage to the seal.
Lubrication assistance: Apply lubricating oil or soap solution on the O-ring for easy installation, but the ethylene propylene rubber material should not come into contact with mineral oil.
Direction confirmation: Pay attention to distinguishing the installation direction of the left/right static ring and shaft sleeve, and place the anti displacement snap ring correctly.
Manual inspection: After installation, rotate the spindle by hand to ensure no jamming and even friction. Otherwise, it needs to be disassembled and adjusted.
b. Key monitoring points during operation
Isolation fluid management:
Monitor the temperature, pressure, and liquid level of the isolation fluid to ensure that it is 0.01-0.03MPa higher than the pressure of the sealed medium (pressurized type).
Regularly replenish the sealing fluid lost due to leakage and maintain the normal oil level in the replenishment tank.
Backwash protection:
Ensure smooth supply of flushing solution, promptly remove frictional heat and impurities, and prevent dry grinding.
Regularly clean the filter to ensure the purity of the flushing solution.
Abnormal warning:
Observe for any signs of leakage, vibration, or abnormal noise. If there is a sudden increase in leakage, stop the machine for inspection in a timely manner.
Use pressure switches or liquid level switches to achieve automatic leakage alarm.
c. Daily maintenance and periodic maintenance
maintenance project
Sealing surface inspection
Replacement of vulnerable parts
Cleaning and lubrication
Storage Management
Sealing fluid replacement
(Additional explanation) For special equipment such as high silicon cast iron pumps, single end or double mechanical seal for pump can be selected, which are suitable for transporting strongly corrosive media.
3. Suggestions
To ensure the long-term stable operation of the double mechanical seal for pump, it is recommended to establish a standardized inspection system, focusing on the status of the isolation fluid, the smoothness of the flushing system, the trend of seal leakage changes, and keeping maintenance records. At the same time, choose the double sealing form with or without pressure reasonably according to the characteristics of the medium.
