Centrifugal pumps are widely used in petrochemical, coal chemical and other chemical industries, the transmission of different nature of the liquid to provide the chemical reaction pressure, flow. Centrifugal pump of a wide range, according to the nature of the transmission medium can be divided into acid pump, alkali pump, water pump, mud pump. Transmission medium temperature and working pressure of different, therefore, effectively extend the life cycle of centrifugal pumps and reduce the amount of maintenance, to improve the economic efficiency of the plant has a significant role. Centrifugal pump selection and installation Centrifugal pump should be selected according to the liquid delivered, and check the required performance, analysis of suction, discharge conditions, is intermittent operation or continuous operation. Centrifugal pumps should normally be operated at or near the pressure and flow rates specified by the manufacturer's design. Pump installation should be carried out the following review: ①The basic size, location, elevation should meet the design requirements, anchor bolts must be properly and correctly fixed in the concrete foundation, the machine should not be missing parts, damage or corrosion, etc .; ② According to Pump the characteristics of the transmission medium, if necessary, should check the main parts, shaft seals and gasket material; ③ pump leveling, find work should be consistent with the provisions of equipment and technical documents, if there is no provision should be consistent with the existing national standards " Mechanical equipment installation engineering construction and acceptance of common norms "provisions; ④ all connected with the pump pipe, pipe fittings and lube oil pipeline cleaning requirements should be consistent with the relevant national standards. 2, the use of centrifugal pump test run the pump should meet the following requirements: ①drive the steering should be the same with the pump steering; ② identify the pipeline pump and coaxial pump steering; ③ fixed connection parts should be no loose, the lubrication Parts filling lubricant specifications and quantity shall comply with the provisions of equipment technical documents; ④ pre-lubrication requirements of the site should be pre-lubricated; ⑤ all instrumentation, safety devices should be sensitive, accurate and reliable; ⑥ disc car Should be flexible, no abnormalities; ⑦ high temperature pump should be preheated before the test run, the temperature should be uniform rise, the temperature rise per hour should not exceed 500 ℃; pump body surface with the working medium inlet pipe temperature difference is not Should be greater than 4090; ⑧ set to eliminate the impact of temperature rise of the connection device, set the bypass connection device to provide cooling water. Centrifugal pump operation should pay attention to the following points: ①prohibit water-free operation, do not adjust suction port to reduce displacement, prohibit running at too low a flow rate; ② monitor the operation process, completely prevent packing box leakage, when changing the packing box With a new packing; ③ to ensure that mechanical seals have a full flush of 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 operating hours, packing adjustments and replacements, adding lubricants and other maintenance measures and times. Centrifugal pump suction and discharge pressure, flow, power input, lotion and bearing temperature and vibration conditions should be measured regularly recorded.
