When the medium is cooling water containing particles or high-concentration chloride ions, the selection of the BR-20 plate heat exchanger requires first confirming the materials of the plates and gaskets. In a system with a nominal pressure of 1.0 MPa and a design temperature of 120°C, if the medium is clean water, 304 plates with nitrile gaskets can be used; if chloride ions are present, 316L or titanium should be given priority, and the gaskets should also be upgraded to EPDM or fluororubber. Procurement personnel should require suppliers to provide material certificates and pressure test reports, and verify plate thickness and corrugation pattern, because thickness affects pressure resistance and corrugation pattern affects heat transfer efficiency.
Q: How should the interface flange standard of the BR-20 match the on-site pipeline? A: Common flange standards include HG/T20592 and GB/T9119. Before procurement, it is necessary to measure the dimensions, pressure rating, and sealing face type of the on-site pipeline flange to avoid installation failure after delivery. If the pipeline is DN80, the equipment interface should also be DN80, and the flange pressure rating should not be lower than the pipeline design pressure.
Q: How can it be determined whether the number of plates meets the cooling load? A: The number of plates and the flow arrangement determine the heat exchange area and flow velocity. Adding plates can increase the heat transfer area, but a decrease in flow velocity may affect the heat transfer coefficient; reducing plates increases flow velocity and pump power consumption. It is recommended to perform simulation calculations based on working condition parameters such as medium flow rate, inlet and outlet temperatures, and allowable pressure drop, so as to achieve a balance between heat transfer efficiency and pump power consumption. In similar scenarios, the BR-50 plate heat exchanger can also be adapted to the cooling load by adjusting the number of plates and the flow arrangement. Procurement personnel can refer to this approach when communicating with suppliers.
Q: How can the gasket replacement cycle be estimated? A: Gasket life is affected by medium temperature, concentration, and pressure fluctuations. Nitrile gaskets are suitable for clean water conditions below 80°C, EPDM gaskets can withstand temperatures up to 120°C, and fluororubber gaskets are suitable for high-temperature or oil-containing media. During procurement, suppliers can be asked to provide gasket material reports, and attention should be paid to their temperature resistance and medium resistance data.
