How to effectively extend the service cycle of the centrifugal pump to reduce the amount of maintenance? This has a great effect on improving the economic efficiency of the factory. Let’s share the experience with the experts.
1. For the selection and installation of centrifugal pumps
Centrifugal pumps should be selected according to the liquid to be transported and checked for required performance, analysis of suction, discharge conditions, intermittent operation or continuous operation, etc. Centrifugal pumps should generally operate at or near the pressure and flow conditions specified by the manufacturer. The following rechecks should be made during pump installation:
① The size, position and elevation of the centrifugal pump foundation should meet the design requirements, the anchor bolts must be properly and correctly fixed in the concrete foundation, and the machine should no missing parts, be damaged or rusted;
②According to the characteristics of the medium conveyed by the pump, the materials of main parts, shaft seals and gaskets should be checked if necessary;
③The leveling and alignment of the pump should meet the requirements of the equipment technical documents. If there is no requirement, it should meet the requirements of the current national standard “General Specification for Construction and Acceptance of Mechanical Equipment Installation Engineering”;
④The installation of all pipes and pipe fittings connected with the pump body and the cleaning requirements of the lubricating oil pipes should comply with the relevant national standards.
2. The use of centrifugal magnetic pump
The trial operation of the centrifugal pump should meet the following requirements:
①The steering of the driving machine should be the same as that of the pump;
②Find out the steering of pipeline pump and coaxial pump;
③There should be no looseness in each fixed connection part, and the specification and quantity of lubricant added to each lubrication part should meet the requirements of the equipment technical document;
④ The parts with pre-lubrication requirements should be pre-lubricated according to regulations;
⑤The safety protection devices of all indicating instruments should be sensitive, accurate and reliable;
⑥ The cranking should be flexible and no abnormal phenomena;
⑦The high temperature pump should be preheated before trial operation, and the temperature should not exceed 500℃ per hour; the temperature difference between the surface of the pump body and the process pipeline with the working medium inlet should not exceed 4090;
⑧Set up a connection device to eliminate the influence of temperature rise to provide a cooling water source.
Pay attention to the following points when operating the centrifugal pump:
①It is forbidden to run without water, do not adjust the suction to reduce the displacement, and run under too low flow;
②Monitor the operation process to completely prevent the stuffing box from leaking and use new stuffing when replacing the stuffing box;
③Ensure that the mechanical seal has sufficient flushing water flow, and excessive water flow is prohibited for water-cooled bearings;
④Do not use too much lubricant;
⑤Inspect according to the recommended cycle. Establish operating records including operating hours, adjustment and replacement of packing, adding lubricant and other maintenance measures and time.