Vacuum pumps with rotating liquid ring (generally referred to as compressors) are used in various technological processes where suction and pumping of gases without oils are necessary, in particular in chemical, pharmaceutical, food, paper and textile industries, as well as to prime centrifugal pumps and leverages.
The reason for the maintenance operations was the loss of pump efficiency and its loud operation. The pump also got jammed.
After dismantling pump body and shaft, the physical examination was made, based on which the pump shaft was found damaged at the place of milling the keyway.
The damage was the consequence of breaking the shim securing the rotor nut against loosening. The nut which was not secured caused loosening of the rotor, which led to the damage of the keyway on the shaft.
DESCRIPTION OF THE SCOPE OF PERFORMED MODERNIZING WORK
- cleaning hydraulic elements of the pump,
- pump shaft replacement,
- replacement of the prismatic key,
- replacement of the rotor nut and the shim securing the nut,
- replacement of mechanical sealing,
- replacement of pump bearings,
- restoration of painting coating.
After performing all above maintenance operations, the quality control was performed, including:
- inspection of pump shaft rotation slack,
- static test of pump tightness.
