The sealing gaskets of a plate-and-shell heat exchanger must be selected from nitrile, EPDM, or fluororubber according to the medium temperature and chemical properties. Gaskets from different batches must not be mixed. When replacing, the entire unit should be uniformly replaced to avoid local leakage caused by differences in hardness and rebound rate. During the design and selection stage, the medium composition must be clearly defined. If aromatics or ketones are present, nitrile gaskets are not suitable and fluororubber material should be selected.
The shell side can withstand higher pressure and is suitable for media with higher pressure; the plate side is suitable for clean media or media containing a small amount of particles. If the medium contains fibers or large particles, it is recommended to install a filtration device at the inlet of the plate side to prevent channel blockage. The number of plates and the flow pass combination must be calculated based on medium flow rate, allowable pressure drop, and heat exchange area, and should not be directly copied from old drawings.
Before procurement, the medium composition, inlet temperature, outlet temperature, working pressure, and flow rate should be provided. Without the medium composition, it is impossible to confirm whether the gasket material and plate material are compatible; without the flow rate and allowable pressure drop, it is impossible to reasonably determine the number of plates and the flow pass combination. For media containing a small amount of particles, the particle size range and content must also be specified.
This model adopts a combined structure of plate pack and shell. The plate-side channel is relatively narrow, while the shell-side channel is relatively wide. It is suitable for scenarios such as HVAC, district heating, and chemical process cooling, and is especially suitable for working conditions where the shell-side pressure is relatively high and the plate-side medium is relatively clean. During maintenance, the plate pack can be pulled out by loosening the clamping bolts to inspect or replace the gaskets.
