Repair and replacement of the mechanical seal, pump CDLF 8-200, dearator water of the boiler DKVR 6.3
Causes of wear of the friction pairs of the mechanical seal of the feed pump of the boiler DKVR. As a result of the operation of the pressure increase pump of a steam boiler, a feed pump operating on the supply of deaerator water without a bypass, for de-airing the chamber of the mechanical seal installation.
Reasons: when the water supply pressure from the deaerator, water increases at a temperature of 105 C, a vacuum occurs at the pump suction, which leads to boiling and the formation of micro-bubbles of steam, which, with the design feature of vertical centrifugal pumps, fall into the upper chamber of the pump, where the mechanical seal is installed. As a result, the mechanical seal also works "dry". An example of a photo of mechanical seal wear in a vertical centrifugal pump of the CR GRUNDFOS, WILO MVI, CALPEDA, DAB, SPERONI, CDLF type. The whole difference is in the brand, and not in the principle of operation and the device of the pump.
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