Material selection of chemical solution chemical pumps for hydrofluoric acid, alkali, hydrochloric acid, sulfuric acid, etc.

The pump is a common mechanical equipment for the transportation of chemical materials and the pressurization of strong corrosive liquids. Chemical solutions such as sulfuric acid, hydrochloric acid, and hydrofluoric acid have strong corrosive properties. When choosing a chemical pump, the corrosion-resistant fluoroplastic chemical pump is a very suitable corrosion-resistant pump. , Fluoroplastics and fluoroplastics manufactured by Seiken Pumps are very suitable. The impeller and pump cover in the fluoroplastic pump are made of metal material inserts and outsourcing fluoroplastics. The main part of the pump casing is made of HT200 lining. F46 is manufactured. Hydrofluoric acid is a solution of hydrogen fluoride vapor. It is a clear, corrosive liquid with no color or smoke. It has a strong irritating taste and is very easy to volatilize. It will become white smoke after contact with air. Although it is non-flammable, it can react with most metal materials to transform into hydrogen and easily cause an explosion. In addition, hydrofluoric acid is a highly harmful substance, which can cause ulcers when it touches the skin. If the gas is inhaled, it can be fatal.

Therefore, what special requirements should we pay attention to when using a suitable hydrofluoric acid chemical pump? The fusion of hydrogen atoms and fluorine atoms has a relatively strong working ability, which makes hydrofluoric acid unable to be completely electrolyzed in water and has strong corrosion. It can attack metal materials, glass and silicon-containing blocks. Therefore, ordinary Sic silicon carbide contains free silicon and silicon dioxide and other impurities. This kind of impurities is very easy to be etched by hydrofluoric acid. The smoothness of the ground surface will endanger the life of the pump. For chemical aqueous solutions such as hydrofluoric acid, alkali, hydrochloric acid, and sulfuric acid with corrosive media, when selecting fluorine-lined centrifugal pumps and fluorine-lined magnetic pumps, the dynamic and static rings of the centrifugal pump and the main shaft, bushing, moving and static The ring must be made of pressureless sintered silicon carbide material. Seken pump accessories can be adjusted according to the different flow, head and concentration of the medium used by customers, and manufacture high-strength corrosion-resistant, high-temperature, explosion-proof DC variable frequency fluoroplastic chemical pumps that can be used in suitable on-site working conditions.

Chemical centrifugal pump emergency stop steps

Chemical centrifugal pump emergency stop steps

Centrifugation is actually a manifestation of the inertia of an object. For example, when the umbrella rotates slowly, the water droplets will follow the umbrella. This is because the friction between the umbrella and the water droplet acts as the centripetal force of the water droplet. However, if the umbrella spins faster and the friction is not enough to make the droplets spin in a circle, the raindrops will move from the umbrella to the outer edge. It’s like pulling a rock with a rope. If it runs too fast, the rope will break and the rocks will fly out. This is called centrifugation.

The chemical centrifugal pump is designed according to this principle. The high-speed rotating impeller blades drive the water to rotate and throw the water to achieve the purpose of transportation.

Chemical emergency shutdown steps:
1. Quickly press the stop button to stop the pump.
2. Close the outlet valve and wait for the pump to stop for 2 to 3 turns.
3. Control the liquid level of the storage tank and close the inlet, cooling water, lubricating oil and other valves.
4. If it is a heat-conducting oil pump, pay attention to temperature safety.

Chemical pump manufacturers and suppliers from China

What should I pay attention to when repairing chemical pumps?

The maintenance requirements for chemical pumps are as follows

1. Clear and adjust the large gap caused by internal damage and erosion of the pump.

2. Remove dirt, dirt and rust from the pump.

3. Repair or replace the non-compliant or defective parts in time.

4. The rotor balance test is qualified.

5. Validate the coaxiality of the pump and the driver and meet the standards.

6. The test run is qualified and the data is complete. Before the process production needs to be overhauled, we must pay attention to these points. First, the pump should be cut off from the power supply, stopped to cool down, and then the pipeline is depressurized.

When the chemical pump inspection is over and the assembly is to be carried out, pay attention to the following:
1. Whether the pump shaft is bent or deformed.
2. Whether the balance of the rotor meets the standard.
3. The gap between the impeller and the pump casing.
4. Is the shrinkage of the mechanically sealed cache compensation organization regulated?
5. Concentricity of pump rotor and volute.
6. Whether the center line of the volute flow channel and the center line of the pump impeller flow channel are aligned.
7. Adjust the gap between the bearing and the end cover.
8. Adjust the gap of the sealing part.
9. Does the assembly of the transmission motor and the variable (increasing or subtracting) remonstrator meet the requirements?
10. Coaxiality alignment of the coupling.
11. Whether the gap of the mouth ring meets the standard.
12. Whether the tightness of each part connection is appropriate.

PP chemical pump — PP Vertical chemical pump are Designed for the recycling, treatment, and filtration of corrosive liquids (including those with solids) having the tendency to foul, kept in constant level tanks.
The Polypropylene Submersible Chemical & Acid Pump Vertical series are constructed at standard lengths, without intermediate bearings, without guide bushings or mechanical seals to eliminate any sliding parts. This mechanically and hydraulically advanced construction allows for the use of the PP vertical pumps where wear from abrasion (due to crystallization or calcareous deposits) combined to the chemical aggression of the liquid itself requires a more incisive solution than normal vertical pumps.

Chemical pump coating can be used to prevent corrosion

Chemical pump coating can be used to prevent corrosion:
Pump corrosion is a headache problem in industrial production. Generally speaking, corrosion is equipment oxidation caused by environmental media. Corrosion not only causes economic losses to enterprises, but also harms safety and the environment, and increases the loss of natural resources.

Metal corrosion can be divided into two categories: general (uniform) corrosion and localized corrosion. The former occurs more uniformly on all surfaces of the device, while the latter only occurs locally. Such as pitting corrosion, intergranular corrosion, crevice corrosion, hydrogen corrosion, stress corrosion cracking, wear corrosion, delamination corrosion, etc. Especially in the petroleum, chemical industry and marine atmospheric environment.

Chemical pumps are used in these industries, and the anti-corrosion requirements for chemical pumps are getting higher and higher. Once there is a problem in the anti-corrosion work, it will damage the mechanical equipment in the slightest, and may cause a major chemical accident.

For the corrosion problem of chemical pumps, frequent maintenance and replacement of equipment components are the methods commonly used by enterprises at present. The equipment is affected by the material and processing technology, and has high general value.

Polymer composite materials can be used for surface organic coating repair, which is one of the effective anti-corrosion measures for chemical pumps. The surface adhesion coating maintenance method of chemical pumps can be widely used in the repair and pre-protective coating of cavitation, abrasion and corrosion parts. It has excellent chemical resistance and excellent mechanical and adhesive properties. Compared with the traditional welding repair of the pressure device, this method has the advantages of low cost, simple structure, safety performance, and good repair effect.

Chemical pump manufacturers and suppliers from China

Main points of plastic vertical pump installation

When installing a plastic vertical pump, choose a firm horizontal surface, keep the body vertical and fix it.
Try to avoid installing the machine outdoors. If it is installed outdoors, it should be covered with a protective cover. If the pump is equipped with an electronic controller, it must be protected.
Before piping, you should consider the chemistry, temperature conditions and conveying head, and choose different pipe materials to meet actual requirements. For example, if the temperature is above 60℃, PVDF pipe fittings should be installed.
When piping, be careful not to leave any impurities or debris in the pipe, and clean the pipe with clean water if necessary.
The flange joints should be lined with gaskets, and they should be tightened to prevent air from being sucked into the pump.
When piping, pay attention to that the pipeline cannot be twisted by force. After installation, check whether the pump is twisted or deformed due to excessive force during installation or incorrect installation action.
After the pump is installed, make sure that the pipeline is firm to avoid damage to the pipeline caused by vibration.
Before connecting the power cord, make sure that the power used is consistent with the motor type, and connect the overcurrent protection switch.
If the height of the outlet piping is higher than the motor or there is a back pressure situation, please install a check valve at the pump outlet, and the position of the device should not exceed the height of the liquid level too much.
For the sake of stability, install the inlet filter to avoid sucking in debris and damaging the pump
The inlet connecting flange must have the same diameter as the inlet flange, and the outlet connecting flange must have the same diameter as the outlet flange. Warning: Too tight or too loose will affect flow performance and even performance. Please make sure that all nuts are locked. Failure to lock will cause liquid to leak out. If the lock is too tight, it will easily fall off and be damaged. Please install it by personnel familiar with the installation method of this machine and equipment.
For the voltage of the pump motor, please refer to the motor nameplate, and the circuit connection diagram can be found on the motor connection box.

How to use the Air operated double diaphragm pump correctly

Air operated double diaphragm pump is a positive displacement pump that uses compressed air as the power to change the volume through the reciprocating deformation of the diaphragm. Its working principle is similar to that of a plunger pump. Pay attention to the following points when using AODD PUMP:
1. Ensure that the large particles contained in the fluid do not exceed the pump’s large safety to pass the particle diameter standard.
2. The intake pressure should not exceed the high allowable working pressure of the pump. Compressed air higher than the rated pressure may cause personal injury and property loss and damage the performance of the pump.
3. Ensure that the piping system of the diaphragm pump pressure can withstand the high output pressure reached, and ensure the cleanness and normal working conditions of the driving air system.
4. Electrostatic sparks may cause explosions, resulting in personal injury, accidents, and property losses. Use a wire with a large enough cross-sectional area as needed to properly and reliably ground the ground screw on the pump.
5. Grounding requirements comply with local laws and regulations and some special requirements on site.
6. Fasten the aodd pumps and each connecting pipe joint to prevent electrostatic sparks from being generated by vibration. Use antistatic hose.

7. To periodically check and test the reliability of the grounding system, the grounding resistance is required to be less than 100 ohms.

8. Keep good exhaust and ventilation, away from flammable, explosive and heat sources.
9. The exhaust of the diaphragm pump may contain solids. Do not point the exhaust to the working area or people to avoid personal injury.

10. When the diaphragm fails, the conveyed materials will be ejected from the exhaust muffler.
11. When transporting flammable and toxic fluids, please connect the outlet to a safe place away from the work area.

12. Please use at least 3/8″ inner diameter pipe with smooth inner wall to connect the exhaust port and the muffler.

13. The high pressure of the fluid may cause serious personal injury and property damage. Please do not perform any maintenance work on the diaphragm pump and the material pipe system when the pump is pressurized. If the rotor pump needs to be repaired, first cut off the pump inlet Open the bypass pressure relief mechanism to relieve the pressure of the pipeline system, and slowly loosen the connected pipeline joints.

14. Pumps using aluminum alloy materials for the liquid transportation part, please do not use them to transport liquids containing Fe3+, halogenated hydrocarbons and other halogenated hydrocarbon solvents, which will cause corrosion and cause the pump body to burst.

15. Ensure that all parts contacting the conveying body will not be corroded and damaged by the conveyed fluid.
16. Ensure that all operators are familiar with the operation and use of the pump and master the safety precautions for the use of the pump. If necessary, provide necessary protective equipment.

17. Use the pump correctly and do not allow long-term dry operation.

AODD PUMP — AODD pumps also called air operated diaphragm pumps, are positive displacement pumps driven and powered by compressed air rather than an electric motor.

The corrosion-resistant self-priming pump select

The corrosion-resistant self-priming pump is a special material self-priming pump with corrosion resistance, so that there are more and more choices for the liquid delivered by the self-priming pump. Then which corrosion-resistant self-priming pump is better, I will show you Analyze.

Corrosion-resistant self-priming pump materials: PP, PVDF, stainless steel, these three materials are arranged in sequence, the strongest corrosion resistance is the corrosion-resistant self-priming pump made of stainless steel, and PVDF and stainless steel are also particularly resistant to high temperature, so generally We will choose to use PVDF and stainless steel self-priming pumps. If it is not a special liquid, you can use PP corrosion-resistant self-priming pumps. After all, the latter two are more expensive.

Corrosion-resistant self-priming pump suction length: Corrosion-resistant self-priming pump is not only corrosion-resistant, but also a self-priming pump, so the most important point to measure self-priming pump is suction. The higher the suction, the more expensive the self-priming pump. Corrosion self-priming pumps have a suction lift of 5 meters. The higher the value, the more expensive. The flow rate and head are also factors that measure the quality of self-priming pumps. Therefore, choose the corrosion-resistant self-priming pump at the same price. Who is better.

Summary: The above two major points are important factors for judging the quality of corrosion-resistant self-priming pumps, and the quality, noise, stability, and safety are also standards for judging the quality of corrosion-resistant self-priming pumps.

What is the difference between a self-priming pump and a centrifugal pump?

What is the difference between a self-priming pump and a centrifugal pump? We call water pumps with self-priming function as self-priming pumps. Common self-priming pumps on the market are: plastic self-priming pumps (plastics include: PP, PVDF, fluoroplastics, fluorine-lined), stainless steel self-priming pumps ( sus304, sus316), self-controlled self-priming pumps (also called vertical self-priming pumps), etc. Centrifugal pumps refer to pumps that use centrifugal force to work. They can all be called centrifugal pumps, such as magnetic pumps (large and small), pipeline pumps , Sewage pumps, vertical pumps and other pumps. In the industrial field, the frequency of use of centrifugal pumps is unmatched by other pumps.

Self-priming pump:

Fill the pump casing with water before starting the pump (or there is water in the pump casing itself). After starting, the impeller rotates at a high speed to make the water in the impeller channel flow to the volute. At this time, the inlet forms a vacuum, so that the water inlet check door opens, and the air in the suction pipe enters the pump and reaches the outer edge through the impeller channel.

Self-priming pumps all adopt the pump body structure with axial liquid return. The pump body is composed of a suction chamber, a liquid storage chamber, a scroll chamber, a liquid return hole, a gas-liquid separation chamber, etc. After the pump is started normally, the impeller sucks the liquid stored in the suction chamber and the air in the suction pipeline together, and the impeller The inside can be completely mixed. Under the action of centrifugal force, the liquid entrains the gas to flow toward the outer edge of the scroll, forming a certain thickness of white foam belt and high-speed rotating liquid ring on the outer edge of the impeller. The gas-liquid mixture enters the gas-liquid separation chamber through the diffuser. At this time, due to the sudden decrease of the flow rate, the lighter gas is separated from the mixed gas-liquid, and the gas continues to rise and discharge through the pump body spout. The degassed liquid returns to the liquid storage chamber, and enters the impeller again through the return hole, and mixes with the gas sucked in from the suction pipe inside the impeller again, and flows to the outer edge of the impeller under the action of the high-speed rotating impeller…. … As this process goes on again and again, the air in the suction pipeline is continuously reduced until the gas is exhausted and the self-priming process is completed, and the pump is put into normal operation. ——From Baidu Encyclopedia

Centrifugal pump:

Refers to the centrifugal force generated when the impeller rotates to transport the liquid pump.

After the centrifugal pump is started, the pump shaft will drive the impeller to rotate at a high speed, forcing the pre-filled liquid to rotate between the blades. Under the action of inertial centrifugal force, the liquid moves radially from the middle of the impeller to the outer periphery.

The liquid medium gains energy during its movement through the impeller, resulting in an increase in static pressure and an increase in flow velocity. When the liquid leaves the impeller and enters the pump casing, it decelerates due to the gradual expansion of the flow passage in the casing. Part of the kinetic energy is converted into static pressure energy, and then flows into the discharge pipe tangentially.

When the liquid is thrown from the middle of the impeller to the outer periphery, a low pressure zone will be formed in the middle of the impeller. Under the action of the total potential energy difference between the liquid level of the storage tank and the middle of the impeller, the liquid will be sucked into the middle of the impeller. Relying on the continuous operation of the impeller, the liquid is continuously sucked and discharged. The mechanical energy obtained by the liquid in the centrifugal pump is manifested as an increase in static pressure energy. ——From Zhihu

classification:

Self-priming pump: Self-priming pump is also a pump that relies on centrifugal force to transport liquid, so self-priming pump is also a kind of centrifugal pump, which can be called self-priming centrifugal pump. Self-priming pumps include: plastic self-priming pumps, stainless steel self-priming pumps, vacuum self-priming pumps, cast iron self-priming pumps, self-control self-priming pumps, etc.

Centrifugal pump: The range of centrifugal pump is much larger than self-priming pump.

According to the number of impellers: single-stage pump, multi-stage pump;

According to working pressure: low pressure pump, medium pressure pump, high pressure pump;

According to the impeller suction mode: single suction pump, double suction pump;

According to the position of the pump shaft: horizontal pump, vertical pump;

According to the way of impeller access: volute pump, guide vane pump;

According to purpose: oil pump, sewage pump, sewage pump, waste gas pump, circulation pump, etc.;

How to choose in use?

In specific working conditions, such as sewage treatment plants, electroplating plants, power stations, communities, photovoltaics and other specific sites, how do we choose between self-priming pumps and centrifugal pumps? It is definitely better to choose a centrifugal pump because the liquid level is higher than that of the pump to flow into the pump, because the efficiency of the centrifugal pump is higher than the self-priming pump. However, some processes, such as sewage treatment, require the use of self-priming pumps to transport sewage from the sewage tank to other places, because self-priming pumps have a certain self-priming ability.

Pay attention to the following points when operating the pneumatic diaphragm pump

Pay attention to the following points when operating the pneumatic diaphragm pump:

1. Ensure that the largest particle contained in the fluid does not exceed the pump’s maximum safe passing particle diameter standard.

2. The intake pressure should not exceed the maximum allowable working pressure of the pump. Compressed air higher than the rated pressure may cause personal injury and property loss and damage the performance of the pump.

3. Ensure that the pump pressure piping system can withstand the highest output pressure reached, and ensure the cleanliness and normal working conditions of the driving air system.

4. Electrostatic sparks may cause explosions, resulting in personal injury, accidents, and property losses. Use a wire with a large enough cross-sectional area as needed to properly and reliably ground the ground screw on the pump.

5. Grounding requirements comply with local laws and regulations and some special requirements on site.

6. Tighten the pump and each connecting pipe joint to prevent electrostatic sparks from being generated by vibration. Use antistatic hose.

7. To periodically check and test the reliability of the grounding system, the grounding resistance is required to be less than 100 ohms.

8. Maintain good exhaust and ventilation, away from flammable, explosive and heat sources.

9. The exhaust of the pump may contain solids. Do not point the exhaust to the working area or people to avoid personal injury.

10. When the diaphragm fails, the conveyed materials will be ejected from the exhaust muffler.

11. When transporting flammable and toxic fluids, please connect the drain to a safe place away from the work area.

12. Please use at least 3/8″ inner diameter pipe with smooth inner wall to connect the exhaust port and the muffler.

The high pressure of the fluid may cause serious personal injury and property damage. Please do not perform any maintenance on the pump and the material pipe system when the pump is pressurized. For maintenance, first cut off the pump air intake and open The bypass pressure relief mechanism relieves the pressure of the pipeline system and slowly loosens the connected pipe joints.
Please do not send the pump directly to the manufacturer for repair if the pump is transporting hazardous and toxic fluids. Properly dispose of it in accordance with local laws and regulations, and use genuine parts from Shanghai Wangquan Pump Company to ensure service life.
Pumps made of aluminum alloy are used in the liquid transportation part. Please do not use them to transport liquids containing Fe3+, halogenated hydrocarbons and other halogenated hydrocarbon solvents, which will cause corrosion and cause the pump body to burst.
Ensure that all parts contacting the conveying body will not be corroded and damaged by the conveyed fluid.
Ensure that all operators are familiar with the operation and use of the pump and master the safety precautions of the pump. If necessary, provide necessary protective equipment.
Use the pump correctly and do not allow long-term dry running.

Fluorine rubber diaphragm of stainless steel pneumatic diaphragm pump diaphragm

Fluorine rubber diaphragm of stainless steel pneumatic diaphragm pump diaphragm

The fluorine rubber diaphragm is the most expensive of the ss air operated double diaphragm pump diaphragms. It has many similarities with nitrile rubber. What are the advantages compared with nitrile rubber?
From the appearance, both are black, fluorine rubber has a little fragrance (I think the smell is better than nitrile rubber); the main difference is that fluorine rubber is resistant to strong acids and alkalis, but the nitrile material is not resistant to acids and alkalis; fluorine rubber is resistant to grease The performance is better; the temperature resistance of fluorine rubber can reach 250 degrees Celsius, while the nitrile nitrile is about 120 degrees Celsius; in terms of elasticity and abrasion resistance, the nitrile diaphragm is slightly better.
The nitrile diaphragm and the fluorine rubber diaphragm are like pencils and pens, and they are different for different occasions, but in terms of value, the value of fluorine rubber is higher than that of nitrile. But in practical applications, nitrile rubber is more widely used because its price has a huge advantage. If it is an acid-base solution, then nitrile rubber and PTFE diaphragms are used together, and the effect is also very good. The total cost is more than that of fluorine rubber. Cheap. How to use fluorine rubber depends on actual use.

Stainless steel pneumatic diaphragm pump manufacturers and suppliers are from China.