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Time：2025-09-15 14:10:30 Reading volume：
Vacuum oil purifiers are essential for removing water, gas, and impurities from transformer oil, turbine oil, and lubricating oil. However, during operation, it’s common for pressure alarms to occur. These alarms are generally divided into two categories:
Each alarm has different root causes and requires targeted troubleshooting.
A high positive pressure alarm indicates abnormal oil line pressure. This protection mechanism is designed to safeguard the oil pump and filter elements from damage. The most frequent causes include:
Clogged Fine Filter (Most Common Cause)
Over time, the fine filter element collects large amounts of impurities.
When clogged, oil flow is restricted, causing pressure to rise.
Solution: Shut down the system and ｒｅｐｌａｃｅ the clogged filter element with a new one.
Oil Outlet Line Blockage
Outlet valve not fully open.
Oil pipeline bent, narrowed, or blocked.
Solution: Inspect the entire outlet line, open the valve completely, and remove any blockages.
Excessive Oil Viscosity
In cold environments, oil becomes thicker and flows poorly.
High resistance increases system pressure.
Solution: Preheat the oil before filtration to reduce viscosity and improve flow.
A low vacuum alarm occurs when the vacuum tank fails to reach the required vacuum level. This directly affects oil dehydration and degassing efficiency. The main causes include:
Abnormal Vacuum Pump Oil
Oil level too low.
Oil is emulsified or of the wrong grade.
Solution: Check the vacuum pump oil level and ｒｅｐｌａｃｅ it with clean, qualified oil.
System Airtightness Leaks
Aging seals, loose valves, or worn connectors allow air intrusion.
Even minor leaks prevent stable vacuum levels.
Solution: Carefully inspect joints, seals, and connectors. Tighten or ｒｅｐｌａｃｅ where needed.
Excessive Oil Inflow (Overflow)
The inlet valve opened too wide, causing high oil levels in the vacuum tank.
Risk of oil being drawn into the vacuum pump.
Solution: Adjust the oil inlet valve to maintain the oil level at the centerline of the sight glass.
1. Perform an emergency shutdown immediately.
2. Identify the alarm type from the control panel.
For positive pressure alarms, check the filter element and outlet piping first.
For vacuum alarms, check the vacuum pump oil and system airtightness first.
3. Start with the simplest, most common causes to save time.
Regularly ｒｅｐｌａｃｅ filter elements to avoid clogging.
Check and maintain vacuum pump oil to ensure proper performance.
Inspect seals and connectors routinely to prevent leaks.
If troubleshooting does not resolve the issue, contact a professional oil purifier technician for further diagnosis.
Conclusion
Pressure alarms in vacuum oil purifiers are common but manageable issues. High system positive pressure is usually linked to clogged filters, outlet blockages, or oil viscosity, while low vacuum alarms are caused by vacuum pump oil problems, leaks, or excessive oil inflow.
By following proper troubleshooting steps and performing regular maintenance, operators can prevent most alarms, ensure stable vacuum oil purification, and extend the service life of both oil and equipment.
