1. Leakage Caused by Aging or Damage of Sealing Components
Cause Analysis:
Heat exchangers use sealing components such as gaskets and sealing rings, which are exposed to high temperatures, high pressures, and corrosive fluids for long periods. Over time, these components may become aged, hardened, deformed, or lose their elasticity.
Plate heat exchangers rely heavily on gasket sealing. If the gasket is installed incorrectly, insufficiently compressed, or used beyond its service life, external leakage may occur.
Different operating conditions require different gasket materials. High-temperature or highly corrosive applications need sealing materials with better temperature resistance and corrosion resistance.
Solutions:
Regularly inspect the condition of sealing components and replace them immediately if aging, cracks, or deformation are found.
Select suitable gasket materials according to the characteristics of the fluid, operating temperature, and pressure conditions.
Ensure correct gasket positioning and apply uniform tightening according to the manufacturer's requirements during installation.
2. Leakage Caused by Corrosion or Perforation of Plates or Heat Transfer Tubes
Cause Analysis:
Long-term exposure to corrosive fluids, such as acids, alkalis, or saltwater, can cause corrosion of heat exchanger materials.
Pitting corrosion, crevice corrosion, and stress corrosion can gradually reduce material thickness and eventually cause leakage through perforation.
Improper material selection can accelerate equipment damage. For example, standard stainless steel may not be suitable for environments with high chloride concentrations.
Solutions:
Select appropriate materials based on fluid characteristics, such as 316 stainless steel, titanium, or Hastelloy alloys for highly corrosive applications.
Perform regular corrosion inspections, including wall thickness measurements, pressure tests, and non-destructive testing.
Repair slightly corroded areas when possible, and replace damaged plates or tubes if the corrosion is severe.
3. Leakage Caused by Operating Pressure or Temperature Exceeding Design Limits
Cause Analysis:
Operating a heat exchanger beyond its designed pressure or temperature range increases mechanical stress on the equipment.
Frequent start-ups, shutdowns, or rapid temperature changes can cause thermal fatigue, resulting in cracks in welds or connection areas.
Excessive pressure fluctuations may damage sealing structures and lead to leakage.
Solutions:
Ensure that operating conditions remain within the designed pressure and temperature limits.
Install monitoring instruments such as pressure gauges and temperature sensors to detect abnormal operating conditions.
For systems with frequent thermal cycling, optimize start-up and shutdown procedures to reduce thermal shock.
Products Description
4. Leakage Caused by Improper Installation or Maintenance
Cause Analysis:
During installation, uneven pipe loading or incorrect alignment may create additional stress on connections, leading to leakage.
During the disassembly and assembly of plate heat exchangers, uneven bolt tightening may cause unbalanced pressure on the plates.
Improper cleaning or maintenance methods may damage plate surfaces or sealing areas.
Solutions:
Follow the manufacturer's installation requirements for piping connections and equipment support.
When assembling plate heat exchangers, tighten bolts evenly in a diagonal sequence and ensure the correct compression dimension.
Use suitable cleaning agents and proper maintenance procedures to prevent damage to the equipment.
5. Leakage Caused by Fouling and Scaling Inside the Heat Exchanger
Cause Analysis:
Minerals and impurities in cooling water or industrial circulating water can accumulate on heat transfer surfaces and form scale.
Fouling reduces heat transfer efficiency and may cause local overheating, resulting in thermal stress on the material.
Severe scaling can block flow channels, increase pressure loss, and raise the risk of leakage.
Solutions:
Establish an appropriate cleaning schedule based on water quality and operating conditions.
Use chemical cleaning (CIP) or mechanical cleaning methods to remove deposits.
Implement proper water treatment to reduce scaling and corrosion risks.
6. Leakage Caused by Welding Defects or Structural Damage
Cause Analysis:
In shell-and-tube heat exchangers, welding quality directly affects the sealing performance and structural integrity of the equipment.
Manufacturing defects such as incomplete fusion, welding pores, or cracks may gradually expand during long-term operation.
External impact or continuous vibration can also cause fatigue damage to the structure.
Solutions:
Perform regular weld inspections using non-destructive testing methods such as ultrasonic testing and radiographic testing.
Repair welding defects through professional welding procedures.
Reduce equipment vibration by improving piping support and maintaining system stability.
7. How to Quickly Identify Heat Exchanger Leakage?
Common Inspection Methods:
Monitor pressure changes: Abnormal pressure drops or pressure equalization between two fluid sides may indicate internal leakage.
Check for fluid mixing: If the hot and cold fluids mix, it may indicate damage to the heat transfer surface.
Inspect external leakage: Fluid leakage around connections or gasket areas requires immediate inspection and maintenance.
Monitor heat transfer performance: A sudden decrease in heat transfer efficiency may be related to leakage, fouling, or blockage.
8. Key Measures to Prevent Heat Exchanger Leakage
Select the correct heat exchanger type and materials according to actual operating conditions to avoid damage caused by improper design selection.
Establish regular inspection and maintenance programs to identify gasket aging, corrosion, and structural problems at an early stage.
Control operating pressure, temperature, and flow velocity to prevent long-term overload operation.
Carry out proper water treatment and cleaning procedures to reduce scaling and corrosion.
Maintain detailed operating records and use performance data to predict potential failures in advance.
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