PHE Cleaning & Maintenance

Overview

Regular cleaning and maintenance of PHEs is essential for restoring heat transfer efficiency and extending equipment life. Methods include chemical cleaning (soaking, circulation) and mechanical cleaning. Chemical cleaning requires scale sample analysis to determine cleaning agents and procedures. Maintenance services also include gasket replacement (domestic gaskets typically last ~6 years), plate inspection, plate replacement, reassembly, and pressure testing. Acceptance criteria: 72 hours of leak-free operation, pressure testing per national standard NB/T47004. For plates over 7 years old, if more than 20 are damaged, full replacement is recommended.

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