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1, centrifugal pump selection and installation
Centrifugal pumps should be selected according to the liquid delivered, and check the required performance, analysis of suction, discharge conditions, intermittent operation or continuous operation. Centrifugal pumps should generally operate at or near the pressure and flow conditions specified by the manufacturer's design. The following review should be performed when the pump is installed:
1 The basic dimensions, position and elevation shall meet the design requirements. The foundation bolt must be properly and correctly fixed on the concrete foundation. The machine should not be missing, damaged or rusted.
2 According to the characteristics of the medium transported by the pump, the materials of the main parts, shaft seals and gaskets should be checked when necessary;
3 The leveling and correcting of the pump shall be in accordance with the provisions of the equipment technical documents. If there is no regulation, it shall comply with the provisions of the current national standard "General Specification for Construction and Acceptance of Mechanical Equipment Installation Engineering";
4 All piping connected to the pump body, installation of fittings and cleaning of the oil pipelines shall comply with the relevant national standards.
2, the use of centrifugal pumps
The commissioning of the pump should meet the following requirements:
1 The steering of the driver should be the same as the steering of the pump;
2 Find out the steering of the pipeline pump and the coaxial pump;
3 There should be no looseness in each fixed connection part, and the specification and quantity of lubricant added to each lubrication part shall comply with the provisions of the equipment technical documents;
4 Pre-lubricated parts should be pre-lubricated as required;
5 Each indicating instrument and safety protection device should be sensitive, accurate and reliable;
6 car should be flexible, no abnormalities;
7 The high-temperature pump should be preheated before test run. The temperature should rise evenly. The temperature rise should not exceed 500 °C per hour. The temperature difference between the surface of the pump body and the process pipeline with working medium should not exceed 4090.
8 Set the connection device to eliminate the influence of temperature rise, and set the bypass connection device to provide the cooling water source.
The following points should be noted when operating the centrifugal pump:
1 It is forbidden to run without water, do not adjust the intake of people to reduce the displacement, and prohibit the operation under too low flow;
2 Monitor the operation process, completely prevent the leakage of the stuffing box, and use new packing when replacing the stuffing box;
3 to ensure that the mechanical seal has sufficient flushing water flow, water-cooled bearings prohibit the use of excessive water flow;
4 do not use too much lubricant;
5 Check the recommended cycle. Establish operating records, including hours of operation, adjustment and replacement of fillers, addition of lubricants and other maintenance measures and time. Centrifugal pump suction and discharge pressure, flow, input power, lotion and bearing temperature, and vibration conditions should be regularly recorded.
Centrifugal pumps are widely used in petrochemical, coal chemical and other chemical industries to deliver liquids of different properties and provide the pressure and flow required for chemical reactions. There are many kinds of centrifugal pumps, which can be divided into acid pumps, alkaline pumps, clear water pumps, and mud pumps according to the nature of the conveying medium. The working temperature and working pressure of the conveying medium are different. Therefore, effectively prolonging the use cycle of the centrifugal pump and reducing the maintenance amount have a great effect on improving the economic efficiency of the factory.