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Method for extending the service life of a centrifugal pump

- May 17, 2018 -

Method for extending the service life of a centrifugal pump

First, the selection and installation of centrifugal pumps

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 size, position and elevation of the foundation 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 material of the main parts, shaft seals and gaskets should be  checked when necessary;

3, the leveling of the pump, seeking work should be consistent with  the provisions of the equipment technical documents, if not specified,  shall comply with the current national standard "mechanical equipment  installation engineering construction and acceptance of general  specifications";

4. All the pipes connected to the pump body, the installation of the  pipe fittings and the cleaning requirements of the lubricating oil pipes  shall comply with the relevant national standards.

Second, 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 that 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. The vehicle should be flexible and free of abnormal phenomena;

7. 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 piping with working medium should not exceed  4090.

8. Set the connection device to eliminate the effect 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, monitoring the operation process, completely prevent the leakage of  the stuffing box, use the new stuffing when replacing the stuffing box;

3, to ensure that the mechanical seal has a full flush of water, water-cooled bearings prohibit the use of excessive water flow;

4, do not use too much lubricant;

5, check according to 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.