How to operate a chemical centrifugal pumpPrecautions for operation and use of centrifugal pumps

A chemical centrifugal pump is a type of equipment commonly used in the industrial and chemical fields to pump liquids from a low-pressure area to a high-pressure area. The following is the general operation method of chemical centrifugal pumps:

Ensure a safe operating environment for the pump: Check that the surrounding environment of the pump is dry, clean, and free of open flames or flammable materials. Make sure the pump's electrical system is well grounded and the cables are securely connected.

Check the inlet and outlet valves of the pump: Confirm that the inlet valve of the pump is fully open and the outlet valve is fully closed to avoid backflow or leakage of liquid.

Check the operating status of the pump: Observe the pressure gauge and flow gauge of the pump to ensure that the outlet pressure and flow rate of the pump are within the normal range. If there is any abnormality, it should be shut down for maintenance in time.

Monitor the temperature: Regularly monitor the temperature of the pump to ensure that the temperature of the pump is within the normal range to avoid overheating causing equipment damage or accidents.

Check the lubrication system regularly: ensure that the lubrication system of the pump is operating normally, the oil level and quality of the lubricating oil meet the requirements, and replace the lubricating oil regularly.

Shutdown operation: Before stopping, the inlet valve of the centrifugal pump should be closed, and then the motor should be turned off. Avoid backflow or leakage of liquids while ensuring a smooth stop of the motor.

Regular maintenance: Regular maintenance of centrifugal pumps, including cleaning the casing and inlet and outlet valves of the pump, checking the status of seals, cleaning the filter, etc.

It should be noted that the operation method of chemical centrifugal pump may vary depending on the model and manufacturer, and the operation manual of the equipment should be read carefully before operation, and the relevant safety operation procedures and operating procedures should be followed. When operating a centrifugal pump, you should always pay attention to safety to avoid equipment damage or personal injury caused by improper operation. If you are unsure or need professional assistance, please consult the equipment manufacturer or relevant technician.

When the centrifugal pump is turned on, the coupling of the motor and the pump is rotated first to see whether the operation is flexible and whether there is any stuckness. Close the outlet valve before turning on the pump, then start the water pump or vacuum pump, and slowly open the outlet valve after the motor starts normally.

The shutdown of the water pump is the opposite of opening the pump, first closing the outlet valve and then turning off the motor switch.

Centrifugal pumps are basically in this way, and the most commonly used centrifugal pump is the ordinary horizontal centrifugal pump.

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The precautions for the operation and use of the centrifugal pump are as follows: The steering of the drive machine should be the same as the steering of the pump;Identification of the steering of pipeline pumps and coaxial pumps;There should be no loosening of each fixed connection part, and the specifications and quantity of lubricant filled with each lubrication part should be in accordance with the provisions of the technical documents of the equipmentThe parts with pre-lubrication requirements should be pre-lubricated according to the regulations;All indicating instruments and safety protection devices should be sensitive, accurate and reliableThe crank should be flexible and have no abnormal phenomena;The pump body should be preheated before the trial operation of the high-temperature pump, and the temperature should rise evenly, and the temperature rise per hour should not be greater than 50;The temperature difference between the surface of the pump body and the process pipeline with the inlet of the working medium should not be greater than 40;A connecting device to eliminate the effect of temperature rise is installed, and a bypass connection device is installed to provide a cooling water source. 2. The following points should be paid attention to when operating the centrifugal pump:

It is forbidden to run without water, do not adjust the suction inlet to reduce the displacement, and do not operate at too low a flow rate;Monitor the operation process, completely stop the leakage of the stuffing box, and replace the stuffing box with new packingEnsure that the mechanical seal has sufficient water flow for flushing, and the use of excessive water flow is prohibited for water-cooled bearingsDo not use too much lubricant;Check at the recommended period. Establish operating records, including operating hours, packing adjustments and changes, lubricant additions, and other maintenance measures and times. The suction and discharge pressure, flow rate, input power, temperature and vibration of the wash and bearing of the centrifugal pump should be measured and recorded regularly.

The main engine of the centrifugal pump relies on atmospheric pressure to pump water from the low place to the high place, and the atmospheric pressure can only support about the water column at most, so the main engine of the centrifugal pump cannot work 12 meters away from the water surface.

There are two main ways to add water to a centrifugal pump:

Self-priming method: For self-priming centrifugal pumps, water can be added by self-priming. Here's how:

1) Place the centrifugal pump below the water filling point so that the inlet pipe is completely filled with liquid.

2) Close the centrifugal pump outlet valve.

3) Start the centrifugal pump motor to make it run normally.

4) After the centrifugal pump forms a certain liquid flow rate and pressure, gradually open the outlet valve to make the pump transport liquid.

Manual water refill: For non-self-priming centrifugal pumps, water can be added by manual refill. Here's how:

1) Place the centrifugal pump below the water filling point so that the inlet pipe is completely filled with liquid.

2) Close the outlet valve of the Liliang Tanxin pump.

3) Manually add the liquid to the inlet of the centrifugal pump until the centrifugal pump enters the pipe and the pump body is filled with liquid.

4) Start the centrifugal pump motor to make it run normally.

5) After the centrifugal pump forms a certain liquid flow rate and pressure, gradually open the outlet valve to make the pump transport liquid.

It should be noted that in order to ensure the normal operation of the centrifugal pump, the water filling operation should be carried out by professional technicians in accordance with the specified operation process. At the same time, during the water filling operation, it is necessary to ensure that the inlet pipeline is unobstructed to avoid damage or failure to the pump.

1. Self-diversion water filling is like slag water method.

For semi-submerged pumping stations (i.e. pumping stations where the elevation of the inlet pipe and pump top is below the surface of the inlet tank), water can be introduced into the pump without manual irrigation. The disadvantage of this pumping station is that it does not make full use of the water pump's ability to absorb slag and swim quietly, and the installation elevation of the water pump is reduced simultaneously, not only increases the excavation amount of the foundation, but also the operation management is also inconvenient; However, the advantages are also obvious, that is, it is easy to realize the automation and timeliness of the pumping station.

Strong. 2. Artificial water filling method.

For small pumping stations with a diameter of less than 300mm inlet pipe, there is usually a bottom valve at the inlet of the inlet pipe, and the manual filling method is generally adopted, that is, from the special water-filling exhaust hole on the upper part of the centrifugal pump casing, the water-filling funnel (or an upside-down ordinary bottle with the bottom of the bottle removed) is filled with water. For small pumping stations with an inlet pipe diameter of less than 300 mm, there is usually a foot valve at the inlet of the inlet pipe, and the pump can also be filled with water from the outlet of the pump (pumping station with a short outlet line). Since there is no need to purchase other water filling equipment, this water filling method is relatively common in small rural pumping stations.

For the small pumping station without a foot valve, check valve and short pipeline, it can also be started while filling the pump with water from the outlet pipe mouth, so as to gradually bring out the air in the pump and the pipeline, and the pump can pump water normally after a few minutes of continuous water filling.

3. Vacuum water tank filling method.

For small pumping stations without foot valves, the vacuum tank filling method can be used. The vacuum water tank is a closed water tank welded with iron sheet, its volume is at least 3 times the volume of the inlet pipe, the position of the water tank installation should be as close to the water pump as possible, and the bottom height of the water tank should be slightly lower than the axis of the water pump. The height of the vacuum tank is generally 2 times the diameter of the tank.

Before the pump starts, fill the tank with water and seal it. After the water pump is started, the water pump enters the water from the vacuum box, and a certain vacuum is formed in the water tank due to the drop in the water level of the water tank, and the water in the inlet pool will be at atmospheric pressure.

Under the effect, it enters the water tank through the inlet pipe, so as to form a water circulation and make the water pump start to operate normally.

4. Jet pump water filling method.

When the diesel engine drives the water pump to pump water, the exhaust gas discharged from the diesel engine can be used to pass through the jet that communicates with the top of the water pump to pump and fill the water, so as to remove the bottom valve of the water pump. When the pump is started, the valve cover connected to the handle is closed, and the exhaust gas is sprayed out of the ejector, and the air in the pump is sucked out through the connecting pipe. After filling the water, open the valve cover and close the control valve.

The advantage of this water filling method is that it makes full use of the power machine and improves the efficiency of the pumping station.

1. Preparation before driving.

1) Carefully check whether the inlet and outlet pipes, valves, flanges, and pressure gauge joints of the pump are installed safely and meet the requirements, whether the process is correct, and whether the anchor bolts and other connection parts are loose.

2) Add lubricating oil to the bearing box, and the oil level reaches two-thirds of the oil level gauge of the bearing box.

3) Crank to check whether the rotor is relaxed and flexible, and check whether there is metal impact sound or friction sound in the pump body.

4) Install the rear wheel cover, and it is strictly forbidden for the rear wheel to contact with the cover.

5) Clean the base of the pump body and do a good job of hygiene.

6) Open the inlet valve to fill the pump body with liquid, open the exhaust valve, and close it after the air is exhausted. If it is a hot oil pump, it is not allowed to open the air valve to exhaust air to prevent the hot oil from escaping and spontaneously combusting. If there is a dedicated exhaust line and oil tank, air and cold oil can be exhausted to the exhaust line.

7) The hot oil pump should be preheated slowly before starting, especially in winter, so that the temperature difference between the pump body and the conveying medium is below 50.

8) The seal oil must be fully dehydrated before entering the oil pump.

Two. Centrifugal pump start-up.

1) The inlet valve of the pump is fully opened, the outlet valve is fully closed, the motor is started, and the operation of the pump is fully checked.

2) When the pump outlet pressure is higher than the operating pressure, gradually open the outlet valve to control the flow and pressure of the pump.

3) Check whether the motor current is within the rated value. If the pump is running at rated flow and the motor is overloaded, stop the pump for inspection.

1) Fill the shell with liquid.

2) Manually turn the car, check whether there is friction in the pump body, and whether the inlet valve is open.

3) Check whether the lubricating oil in the bearing reaches the oil line and whether the anchor bolts are loose.

4) Close the outlet valve so that the flow rate is zero, at this time the required power is the minimum, is the starting load is limited to the lowest level, to prevent the motor from burning out due to excessive load during starting.

5) After the above preparatory work is completed, the base ridge, start the motor, when the normal speed is reached, check whether the Liangqing pressure gauge is normal, and then slowly open the outlet valve, and the slag seepage should not make the outlet valve close for too long, so as not to cause the temperature in the pump to rise too high, resulting in damage to the parts.

6) When stopping, the outlet valve should be closed first, and then the motor should be stopped to avoid the liquid flowing backwards into the pump to cause impact and reversal, otherwise the pump will be damaged and cause an accident, and finally the inlet valve should be closed.

There are many reasons for considering the selection of chemical centrifugal pumps, including the following aspects:

Flow: The mass flow rate is large, and the appropriate chemical centrifugal pump model is selected to ensure the normal operation of the pumping station.

Head: According to the high temperature or high pressure that needs to be lifted according to the nature of the conveying, select the appropriate chemical centrifugal pump model to ensure the normal operation of the pumping station.

Including the medium: including the medium, temperature, chemical properties. According to the nature and nature of the medium, select and select the appropriate pump body material, material with bucket slag, and method, impeller method and type.

Environmental conditions: including environmental factors such as temperature, humidity, and seawater elevation. Choose the appropriate chemical centrifugal pump model according to the environmental conditions to ensure the normal operation of the pumping station.

Run: Includes Includes, Requirements, Requirements. The operation requires the selection of the appropriate type of centrifugal pump for the chemical industry.

Economy: Choose the right chemical centrifugal pump model according to the economic reasons such as investment cost, operation cost and maintenance cost to ensure the movement pump of the pumping station.

In the process of selection, you can refer to the technical information provided by the manufacturer and consult the professional pump station designer, etc., comprehensively consider the above reasons, and choose carefully.

1.First of all, determine the size of the magnetic pump you are using to install, so as to determine whether the magnetic pump should be vertical or horizontal.

2.The performance of the selected magnetic pump must meet the requirements of the process parameters such as flow, head, pressure, and temperature of the device, and the key is the voltage, the highest head, and the highest head and flow rate that will be achieved under the condition of extreme operation.

3.The characteristics of the material to be conveyed must be met.

a.For some flammable and explosive media that may contain poison, it is necessary to choose a pump with reliable shaft seal or no leakage when selecting a pump, and use isolated magnetic indirect drive as much as possible.

b.For pumps transporting corrosive media, it is required to use corrosion-resistant overflow parts, stainless steel stools can be used for weak corrosion, and fluoroplastic pumps are recommended for strong corrosive media or organic solvents.

c.For conveying medium containing solid particles, corrosion-resistant materials need to be used as overflow parts, and if necessary, the shaft seal of the water pump needs to be flushed with a clean liquid.

4.The mechanical aspect requires high reliability, low noise and low vibration.

Determine the design flow rate of the centrifugal pump.

Determine the design head of the centrifugal pump.

Determine the caliber of the centrifugal pump.

Determine the type of centrifugal pump.

Use the "Centrifugal Pump Performance Table" and the "Centrifugal Pump Performance Comprehensive Cyclone Spectrum Limb Map" to select the model of the relevant centrifugal pump.

Determine the number of centrifugal pumps required.

1. The weight of the pipeline should not be added to the pump during installation, and there should be their own supporting bodies, so as not to affect the operation performance and service life of the deformation.

2. The crack pump and the motor are integral structures, and there is no need to align them during installation, so it is very convenient to install. There is nothing wrong with choosing Shanghai Sunshine.

3. The anchor bolts must be tightened during installation to avoid the impact of vibration on the performance of the pump during starting.

4. Before installing the pump, carefully check whether there are hard objects (such as stones, iron particles, etc.) in the pump flow channel that affect the operation of the pump, so as to avoid damage to the impeller and pump body during the operation of the pump.

5. In order to facilitate maintenance and use safety, a regulating valve is installed on the inlet and outlet pipelines of the pump and a pressure gauge is installed near the outlet of the pump to ensure the operation within the rated head and flow range of Qingmeng, ensure the normal operation of the pump, and prolong the service life of the pump.