Maintenance and repair of shell-and-tube heat exchangers includes both routine maintenance and periodic inspections. Routine maintenance includes cleaning the heat exchanger shell and tube bundle, checking sealing performance and corrosion prevention measures, etc.; periodic inspections include checking the condition of the tube bundle, replacing damaged parts, and inspecting pipe supports and tube bundle fasteners, etc.
Routine Maintenance
1. Cleaning the Shell and Tube Bundle
During use, the shell and tube bundle of a shell-and-tube heat exchanger will accumulate dirt and deposits. These substances reduce heat transfer efficiency and affect the normal operation of the equipment. Therefore, the shell and tube bundle must be cleaned regularly. Typically, a cleaning agent is used to soak the tubes for 10-20 minutes, followed by rinsing with cleaning equipment. Care should be taken to avoid damaging the tube bundle during the cleaning process.
2. Checking Sealing Performance
The sealing performance of a shell-and-tube heat exchanger directly affects its normal operation, therefore, it is necessary to check the sealing performance regularly. Generally, during use, attention should be paid to checking the sealing condition of the equipment, especially during heating, cooling, expansion, and contraction, observing for leakage between the shell and tubes. If leakage is found, measures should be taken to repair it promptly. 3. Inspect Corrosion Prevention Measures
Due to long-term use and varying working media, shell-and-tube heat exchangers are susceptible to corrosion and wear on their surfaces. Therefore, it is essential to regularly inspect the effectiveness of anti-corrosion measures, checking for issues such as coating peeling, rust, and discoloration.
Regular Maintenance
1. Inspect Tube Bundle Condition
After a period of use or when equipment malfunctions, a tube bundle condition inspection is necessary. This includes checking for looseness, deformation, wear, and cracks in the tube bundles. Tube bundles exhibiting abnormalities must be replaced promptly.
2. Replace Damaged Components
During use, shell-and-tube heat exchangers are prone to wear, aging, or damage to certain components. During routine maintenance and periodic inspections, damaged components such as tube sheets, tube beams, and tube plugs must be replaced promptly.
3. Inspect Pipe Supports and Tube Bundle Fixtures
Loosening or damage to the tube bundle fixation and pipe supports of shell-and-tube heat exchangers can affect the normal operation of the equipment. Therefore, the condition of pipe supports and tube bundle fixation components should be reg