In the cooling section of chemical intermediates, the maintenance logic for the BR-50 plate heat exchanger differs significantly from that of shell-and-tube heat exchangers. Maintenance of shell-and-tube equipment typically revolves around tube bundle extraction and shell-side cleaning, with relatively relaxed maintenance intervals; in contrast, plate heat exchangers form flow channels through stacked plates, and sealing gaskets and inter-plate passages are the core maintenance concerns, with leakage, fouling, and pressure drop changes often appearing before temperature anomalies. For technical engineers, understanding this structural difference is the starting point for developing on-site maintenance strategies.
From the perspective of sealing structure, shell-and-tube units achieve static sealing through tubesheet welding or expansion, which is rarely touched during routine maintenance; the removable plates of the BR-50 rely on gasket compression, and gasket aging, misalignment, or residual particles in the grooves can all lead to external leakage or medium cross-contamination. During on-site maintenance, the clamping dimensions should be recorded with emphasis, reviewed according to the clamping amount provided by the manufacturer, and additional compression force should not be arbitrarily applied, as excessive compression accelerates permanent deformation of the gasket. Compared with welded plate solutions, the removable structure facilitates cleaning but places higher requirements on the standardization of fastening operations.
From the perspective of flow channels and cleaning methods, the shell side of shell-and-tube units can be mechanically tube-cleaned, while the corrugated inter-plate channels of plate heat exchangers are narrower, making localized deposition more likely when the medium contains particulate matter. During maintenance, if a significant increase in pressure drop is found without a change in flow rate, priority should be given to investigating inter-plate blockage and fouling; during cleaning, avoid using strongly corrosive media that damage the passivation film of the plates, and after disassembly and reassembly of sealing gaskets, check whether they are properly reseated. Compared with wide-channel solutions, the BR-50 has its own characteristics in turbulence promotion and heat transfer compactness, but is more sensitive to medium cleanliness.
From the perspective of selection review and maintenance continuity, the complete composition, concentration, operating temperature, and presence of particulate matter of the medium should be obtained from the process side during the procurement stage, and the plate material and gasket compatibility should be verified accordingly. Single-pass configurations are suitable for working conditions with larger flow rates and relaxed pressure drop requirements; dual-pass or multi-pass parallel configurations can maintain higher flow velocities at smaller flow rates, which helps to leverage the turbulence-promoting effect of the corrugated plates. The maintenance log should record the pass configuration and pressure drop baseline for subsequent comparative judgment; actual selection and changes still need to be reviewed by process engineers based on physical property parameters.
