Q: When installing the BXS-70 brazed stainless steel heat exchanger, how should the filtration accuracy on the water side and oil side be determined?
A: A Y-type strainer is recommended on the water side to intercept welding slag, scale particles, and biological slime in the piping network; the oil-side filter accuracy should be no less than 100 μm. This heat exchanger has relatively narrow flow channel cross-sections, so once particles enter, they tend to deposit near the brazed joints, causing increased pressure drop and reduced heat transfer efficiency. On-site O&M personnel should connect the heat exchanger only after system flushing has passed, and include the filters in a regular cleaning schedule.
Q: From the perspective of media compatibility, what operating conditions is the BXS-70 suitable for?
A: For media applicability, this model can refer to the media application notes of the same series BXS-150, and is suitable for heat exchange of clean media such as oil-water and water-water. For media environments with high chloride ion concentrations, stainless steel brazed joints carry a stress corrosion risk; during the selection stage, the chloride ion content in the water quality report should be verified, and if necessary, the material scheme should be adjusted or additional anti-corrosion measures added. If complete water quality data cannot be obtained on site, a more corrosion-resistant structural configuration should be selected on a conservative basis.
Q: What parameters need to be checked periodically during O&M to confirm the heat exchanger status?
A: It is recommended to check the inlet-outlet pressure difference and the heat transfer deviation once per quarter. When the pressure difference rises above the set threshold relative to the initial value, the filter pressure difference and flow channel blockage should be inspected; a decrease in heat transfer accompanied by an increase in pressure difference usually indicates particulate deposition. During disassembly and inspection, observe whether there are discoloration or pitting marks in the brazed areas, and record the medium temperature and flow fluctuation ranges as data basis for the next selection or modification.
Q: How should the connection orientation and maintenance access be determined based on site space during selection?
A: The piping connection space after the heat exchanger is in place and the distance required for core removal and maintenance should be measured on site. The BXS-70 has a compact structure, but filters and valves require additional pipe sections; before selection, the connection orientation should be verified against the piping layout drawing to avoid inability to disassemble and clean after installation. On the maintenance side, an operating space of no less than half the heat exchanger length should be reserved to facilitate subsequent flushing and borescope inspection.
