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Slika od dalin lim
od dalin lim - sobota, 20. junij 2020, 08:54
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Explosion-proof tools are required for acetylene. Acetylene is a flammable and explosive gas. The ignition temperature in air is 305 degrees Celsius. When the temperature exceeds 200-300 degrees Celsius, acetylene begins to polymerize. During the process, the temperature will be higher and higher, the reaction will be faster and faster, and eventually it will cause an explosion.

Acetylene is very unstable under high pressure, and decomposition and explosion often occur. After some substances come into contact with acetylene gas, it will accelerate the process of acetylene gas explosion and act as a catalyst. For example: copper oxide is like this. When acetylene is in contact with metals such as copper and silver or their salts for a long time, explosive substances such as copper acetylene (CUC2) and silver acetylene are formed. Therefore, all equipment used for acetylene (including tools often used in acetylene) cannot be made of silver and copper alloys with a copper content of more than 70%.

Explosion-proof Tools

Acetylene belongs to the second class C-level explosive gas. When the concentration of acetylene in the air reaches 1.5-82%, an explosion will occur when there is an ignition source. The required ignition energy is 0.019 millijoules. The propagation speed of the blast wave of acetylene air mixture containing 7-13% acetylene and about 30% acetylene oxygen mixture can reach 300 meters per second. At this time, the explosive force may exceed 36 megapascals. . Due to the mixed combustion of acetylene and oxygen, the flame temperature can reach as high as 3000 degrees Celsius, so acetylene is widely used in gas welding and gas cutting in industry.

In the production process using acetylene as a raw material for chemical production, there may also be defects or operation errors due to inadequate equipment systems, and leakage of acetylene. Therefore, it is also necessary to use explosion-proof tools, explosion-proof wrenches, explosion-proof hammers, explosion-proof pliers, etc. for production operations and equipment maintenance. For acetylene occasions, an explosion-proof tool made of a copper alloy suitable for Class C explosive gas and containing less than 70% lead should be selected.

The above is the introduction of non-sparking tool suppliers about explosion-proof tools used in acetylene occasions. I hope that they will be helpful to you after reading. If you have any other questions, you can contact us.


 
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Explosion-proof tools are collectively referred to as safety tools and non-sparking tools internationally, and domestically as explosion-proof tools. The explosion-proof tools produced, sold and distributed in China can be divided into two categories according to their materials: aluminum-copper alloy (commonly known as aluminum bronze) explosion-proof tools and beryllium copper alloy (commonly known as beryllium bronze) explosion-proof tools.

Explosion-proof tools are mainly used in the petroleum refining and petrochemical industry, coal mines, oil fields, natural gas chemical industry, gunpowder industry, chemical fiber industry, paint industry, fertilizer industry, various pharmaceutical industries. Petroleum wheels and liquefied petroleum gas vehicles, airplanes, warehouses that handle flammable and explosive products, electrolysis workshops, communication machine assembly workshops, places requiring tools that are not rusty, wear-resistant and anti-magnetic.

Explosion-proof Tools

When we use explosion-proof tools, we should pay attention to safety, and operate in accordance with the correct method. If improperly operated, it will cause danger. If we choose incorrect explosion-proof tools, it will also cause danger. Non-sparking tool manufacturer shares with you.

What are the dangers of improper use of explosion-proof tools?

1. Impact hazard:

If the explosion-proof tool operated is not grasped, it will easily lose control and fly out. It may also be caused by an imbalance in the body, causing it to hit the operator's body or someone nearby.

2. Shock hazard

Electric shock accidents of explosion-proof tools may also occur, and the necessary inspections must be carried out before use.

3. Cutting hazard:

The edges of explosion-proof tools are very sharp, and the burrs or sharp corners of such tools can be dangerous to the body.

4. Splash hazard:

Substances that appear during operation, such as chips and chemical solvents, will splash and cause injuries to construction workers.


 
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1. Explosion-proof ratchet wrenches are used as percussion wrenches or sleeve extension tubes, which will cause obvious dents in the handle and work break. In this case, you should choose a T-shaped slider head with a sleeve, an F-shaped lever, and a curved handle Rod or choose a larger ratchet wrench to increase torque!

2. Explosion-proof manual sleeve heads are used for working on pneumatic tools, which will cause obvious damage, slippage, and obvious cracks on the wall of the sleeve head. Pneumatic sleeve series should be selected when in pneumatic operation.

3. When the pliers head is used as a hammer, it will cause dents on the pliers' head or the jaws cannot be properly engaged. Please use appropriate explosion-proof copper hammers and other percussion tools when doing the percussion work. Use explosion-proof needle-nose pliers when bending high-strength wire and sheet materials, which will also cause flaws in the mouth of the needle-nose pliers or improper biting of the pliers.

4. Explosion-proof screwdriver used as a small crowbar or flat shovel, chisel, chisel, will cause the handle part to be loose or disconnected from the working end, or a small generation may cause scars or damage to the working edge of the screwdriver.

5. Explosion-proof wrenches and pipe wrenches are small and large, and the use of casing or lengthened casing will cause the wrench mouth to deform and break, and the handle of the wrench will bend, deform, or break; non-strike wrenches such as live wrenches will be used as explosion-proof copper hammers The head of the wrench is deformed and so on.

In daily work, the explosion-proof tools corresponding to the types, specifications, and models should be specifically selected for different working conditions and environments.

Explosion-proof Wrenches

Proper use and storage of explosion-proof tools can give full play to the advantages of its various performances, so you should pay attention to the following points:

1. The explosion-proof tool is a special safety protection product. When purchasing, it is necessary to check whether the product has been inspected and tested by the National Coal Mine Explosion-proof Safety Product Quality Supervision and Inspection Center and to carefully understand the scope of application, performance, characteristics, and maintenance methods of the product. In addition, strict attention should be paid to whether the product is marked with the "EX" mark.

2. Before using the explosion-proof tools, the combustible gas in the workplace should be compared with the gas in the explosion-proof test, and after being tested with a higher gas index than the ambient gas, then it can be used in a medium with a lower hazard level. Conversely, products that pass the test of lower-level media cannot be used in locations with higher levels of danger. Strictly distinguish the application locations of explosion-proof tools and non-explosion-proof tools. Explosion-proof tools must be used for work that should use explosion-proof tools.

3. Explosion-proof tools have different rated strength requirements, they should be used strictly in accordance with the specified requirements, and overloading is strictly prohibited to avoid damage to the tools.

 



 
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Hydrogen (H2) is a colorless, odorless, odorless, and non-toxic gas. It is only 0.089 grams per liter under standard conditions, which is only 1 / 14.5 of air. It's the lightest gas. It has the smallest viscosity, the highest thermal conductivity, and strong chemical activity, permeability and diffusivity (the diffusion coefficient is 0.63 cm 2 / sec, about 3 times that of methane),  so it is prone to leakage in the production, storage and use of hydrogen. Hydrogen is also a strong reducing agent, which can react with many substances to varying degrees to produce various types of hydrides. Hydrogen has a very wide range of uses. Because hydrogen has a strong permeability, when steel is exposed to hydrogen at a certain temperature and pressure, the atomic hydrogen dissolved in the crystal lattice of the steel causes embrittlement in the slow deformation. It reacts with carbon in the microscopic pores of steel to generate methane. As the amount of methane generated increases, the pores expand into cracks, which accelerates the migration of carbon in the microstructure, reduces the mechanical properties of the steel, and even causes material damage. Usually under high temperature, high pressure or liquid nitrogen temperature, it is easy to cause hydrogen embrittlement or hydrogen corrosion. Therefore, equipment and pipelines working in an environment with hydrogen can cause leakage of hydrogen due to corrosion and cracks. The permeability of hydrogen is also manifested in that if a hydrogen gas is contained in a rubber bag, the hydrogen can leak through the rubber bag. Therefore, a container using a rubber pad as a sealing member also easily generates hydrogen leakage.

Explosion-Proof Tools

At the place of use of hydrogen and the storage and transportation of hydrogen, we should also pay great attention to the issue of fire protection and explosion prevention, and to prevent the existence and generation of any ignition source. Eliminate the conditions that cause it to burn and explode. Many uses of hydrogen are carried out under humidification and pressurization, and the ignition energy and tower explosion limit of hydrogen vary with temperature and pressure. In general, as pressure increases and temperature increases, the explosion limit range becomes wider, which is more likely to cause an explosion fire. In addition, hydrogen has strong permeability and diffusivity, and it is easy to cause leakage and equipment corrosion and damage. Therefore, in any place where hydrogen is used, whether it is in the production process, or when cleaning and repairing the equipment using hydrogen, it is necessary to pay great attention to using explosion-proof tools to prevent impact (collision) and friction sparks Explosion accident.

The above is the introduction of the matters needing attention in the selection of explosion-proof tools in a hydrogen environment. I hope it will be helpful to you. If you have other questions and you want to consult, you can contact us.


 
Slika od Tom haggen
od Tom haggen - sobota, 20. junij 2020, 08:01
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The material of the explosion-proof tool is made of beryllium bronze and aluminum bronze. The beryllium bronze alloy and aluminum bronze alloy do not generate sparks when they are hit or rubbed. They are very suitable for manufacturing safety in explosive, flammable, strong magnetic and corrosive occasions tool.

In the process of using explosion-proof tools, the varieties and specifications should be reasonably selected according to the needs, and small ones should not be replaced by large ones. It should also be noted that when using adjustable wrenches, pipe wrenches, and open wrenches, attention should be paid to the direction of the force, and no reverse force can be used. When using a tool with a blade, the hardness of the workpiece itself should be measured first, if its hardness is close to When the hardness of the tool is used, it should be operated carefully and carefully. If it is higher than the hardness of the tool, it is forbidden to use. When the workpiece is tightened by motor, semi-permanently fixed, or due to long-term rust, and no other measures are taken before using the hand tool, the user should be prohibited to avoid damage to the tool.

Explosion-Proof Tool

The surface of the explosion-proof tool is polished and polished after being polished and polished. The active metal molecules on the surface of the surface are exposed to the air and quickly oxidize and blacken, and then rust. The reason is that the water film left on the surface of the part after cleaning forms an electrochemical A layer of electrolyte solution necessary for corrosion. Although the ionization degree of water is small, it can still be ionized into hydrogen ions and hydroxide ions. This ionization process accelerates with increasing temperature. At the same time, carbon dioxide and sulfur dioxide are also dissolved in the water, which is very easy to combine with water.

1. Explosion-proof wrenches and pipe pliers are replaced by small ones, and the use of casing or lengthened casing will cause the wrench to deform and break, and the handle of the wrench will bend, deform, or break; The head of the wrench is deformed and so on.

2. The explosion-proof manual sleeve head is used for operation on the pneumatic tool, which can cause the position of the square hole of the sleeve head to be damaged. When the pneumatic work is performed, the pneumatic sleeve series should be selected.

3. When the pliers head is used as a hammer, it will cause dents on the plier's head or the jaws cannot be properly engaged. Please use appropriate explosion-proof copper hammers and other percussion tools when doing the percussion work. The use of explosion-proof needle-nose pliers when bending high-strength wire and sheet materials will also cause flaws in the mouth of the needle-nose pliers or improper biting of the pliers.

4. Explosion-proof ratchet wrenches are used for percussion wrenches or sleeve lengthening operations, which can make the handle and work break dents. In this case, it is best to use a T-shaped slider head with a sleeve, an F-type lever, and a curved handle-type wrench. The rod or a ratchet wrench with a large specification is used to increase the torque.

The above information is provided by the non-sparking tool factory.  


 
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Explosion-proof tools manufacturer shares with you. 1. Plum wrench a. The shank is straight, the shape is consistent, and cracks are not allowed. The symmetry of the wall thickness of products below 32mm is allowed to differ by 1mm, and the difference of products above 32mm is allowed to differ by 1.5mm. b. Basic dimensions and tolerance ranges are strictly checked and accepted according to technical requirements. c. Three defects within 1mm2 of product grooves below 32mm are allowed. Three defects of 2mm2 in the product groove of 32mm or more are allowed. 2. Percussion wrenches a. The shank is straight and no cracks are allowed. The wall thickness and symmetry of products below 32mm are allowed to differ by 1mm, and the wall thickness and symmetry below 150mm are allowed to differ by 2mm. b. The basic dimensions and tolerance ranges are accepted according to technical requirements. c. For products below 32mm, three defects within 1mm2 of the slot are allowed, and for products below 80mm, three defects are allowed within 3mm2. Three defects of 5mm2 are allowed in the product groove of more than 80mm. 3. Live wrenches a. The head and handle of the adjustable wrench are straight, the outline is clear, and no defects such as cracks and forgings are allowed. b. The span should move flexibly on the full-body guide rail. C. Two defects in the body slot (4mm~8mm) of 1mm2 are allowed, and two places of (10mm-24mm) of 2mm2 are allowed. Non Sparking Hammer 4. Pipe wrenches a. There should be no cracks, burrs, obvious pinch marks, oxide layers on the parts of the pipe wrench, defects that affect the surface quality, and the head and the handle should be straight. b. When adjusting the nut by hand, the movable jaw should move flexibly in the full stroke. 5. Hammers a. The hammer body is upright, symmetrical, clear in outline, and there should be no defects such as cracks and burrs on the surface. b. The basic dimensions and weight of the hammer body are strictly controlled within the tolerance range. c. The hammer body and shank are straight and firmly installed. 6. F wrenches The two claws of the F wrench should be symmetrical and straight with the shank, and there should be no defects that affect the appearance quality, such as cracks, obvious clamping marks, trachoma, and oxide layer. 7. Screwdriver The cutter bar and the shank are straight, without distortion, and the surface is smooth and free of pinch marks. 8. Pliers and pump pliers a. Visual appearance, parallelism, symmetry, clear outline, without cracks, burrs, and other defects. b. The rotation part of the pliers is flexible and free, the edge part is not misaligned, and the tooth part is clear. Nine, other categories a. No burrs and cracks on the surface. b. For products with handle, the head and the handle are straight and the installation is firm. c. For products with blades, the blades are not allowed to have gaps, curling, etc. Our company provides hot sale non-sparking hammer.
 
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Reasonable selection of slurry pump expeller is one of the key factors to improve the service life of the pump. Reasonable selection of slurry pump includes reasonable selection of pump type, performance parameters, material of over-current parts, seal type and transmission mode.

1. Selection of pump type

There are many types of centrifugal slurry pumps. Different types of pumps should be selected according to the nature of the slurry. Taking Warman pumps as an example, L-type pumps for low-abrasive slurry with a concentration of less than 30% can be selected AH type pumps can be used for high-concentration and strong abrasive slurry pumps; when the liquid level changes greatly and needs to work under liquid, SP (SPR), KZJL type pumps should be selected. When high head conveyance is required. Use ZGB, KZJ or HH pumps.

2. Selection of performance parameters

After the pump type is determined, the head and flow are the basis for choosing the size of the pump and whether it is connected in series. When conveying high-concentration and highly abrasive slurry, the maximum number of pumps nmax (the highest number of rotations in the performance curve) is generally not selected. It is more appropriate to choose a number of rotations of about 3 / 4nmax. When the selected pump is at 3/4 nmax, the flow is appropriate but the head cannot be reached. Multiple pumps can be used in series. For Warman pumps, the flow range of different slurries should also be limited; for high-concentration and strong-abrasive slurry, the flow rate should be selected within the range of 40-80% of the pump's highest efficiency; The flow rate should be selected within the range of 40% -100% of the corresponding flow rate of the pump. Generally, it is not selected in the range of 100% -120% of the corresponding flow of the highest efficiency.

Centrifugal Slurry Pump

Centrifugal Slurry Pump

3.Head Margin

During the operation of the slurry pump, due to the wear of the over-current components, the pump performance continued to decline until it finally failed to meet the working condition requirements. In order to enable the pump to run for a long time near the rated operating conditions, a headroom is usually added when the pump is selected. The general margin is 10% of the rated head.

4.Selection of material for overcurrent parts

There are many materials that can be used for the slurry pump's over-flow parts, which should be determined according to the characteristics of the room (particle composition, particle size, shape, hardness, concentration) and chemical (acid, alkali, oil) used to convey the slurry.

Metal wear-resistant material hard nickel 1 #, has good abrasion resistance to coarse particles;

Hard nickel 4 # has abrasion resistance similar to hard nickel 1 # (public account: pump housekeeper), but for large particles, high stress impact slurry has better abrasion resistance and the price is higher than hard nickel 1 #;

The wear resistance of chromium 27 wear-resistant cast iron is similar to that of hard nickel 1 #. As far as the alkaline mixture is concerned, it has better corrosion resistance and the price is higher than that of hard nickel 1 #.

Cr15Mo3 is currently recognized as an excellent anti-abrasive material in the world. Its macro hardness is as high as 650-750 Brinell hardness. It has good anti-abrasive performance against coarse abrasive slurry, but it is expensive and brittle.

There are many types of rubber materials, which are mainly suitable for fine particles without sharp edges. Natural rubber is suitable for transporting weak acids. In the range of weak alkaline slurry, large abrasive grain size and certain speed, natural rubber is more durable than other metal or rubber elastic materials. Neoprene is not as good as natural rubber, but when the temperature is lower than 200 ° C, it has excellent abrasion resistance in oil slurry. In the application of slurry pump materials, rubber has developed rapidly due to its excellent abrasion resistance, corrosion resistance, and cavitation resistance, especially in the flue gas desulfurization conditions of power plants, which has a service life of up to five years.

5.Selection of shaft seal type

Slurry pumps mainly include shaft seals such as packing seals, auxiliary impeller seals, and mechanical seals.

The auxiliary impeller seal is generally used under reverse irrigation work. The pressure of the high pipe should be less than 10% of the pump outlet pressure. This type of shaft seal does not add shaft seal water, but the use of auxiliary impeller seals to increase power consumption is generally about 5% of the rated power. .

Shaft seal water needs to be added to the packing seal, and sufficient water pressure and water volume must be guaranteed. The shaft seal water pressure is equal to the pump outlet pressure plus 35Kpa. Mechanical seals need to be added with shaft seal water, which has good tightness and no leakage.

6.Transmission method

The transmission method of the slurry pump includes V-shaped V-belt drive, elastic coupling drive, gear reducer drive, hydraulic coupler drive, variable frequency drive, and SCR speed control. Among them, flexible couplings and V-belts are cheap and easy to assemble and disassemble. They should be given priority to be used. But V-belts will increase power consumption by 5%.

7.With motor

After the pump shaft power is calculated, taking into account factors such as pump startup and flow fluctuations, a certain power richness factor should be selected when selecting a standard motor. Generally, the affluent system is 1.1-1.2, the high power is the small value, and the small power is the large value.

We are a centrifugal pump manufacturer. If you have any needs for our products, please feel free to contact us.


 
Slika od JIANBO ZHANG
od JIANBO ZHANG - sobota, 20. junij 2020, 06:01
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The lift of a centrifugal pump is also called the pump's head. It refers to the height at which a pump can lift water and can be understood as the energy obtained by a unit weight of fluid passing through the pump. The pump head size depends on the structure of the pump (such as the size of the impeller diameter, the bending of the blade, etc., and the speed).

At present, the pump head cannot be accurately calculated theoretically. Generally, it is measured experimentally to obtain the pump performance curve, and then the slurry pump selection calculation is performed based on the pump performance curve.

Pump head, flow and power are important parameters for examining the performance of a pump.

Note: The lift of a centrifugal pump is different from the lift height (lifting height). The lift height of a pump refers to the vertical height at which the pump sends liquid from a low place to a high place. Only when the inlet and outlet containers of the pump are at 0.1MP, the inlet and outlet pipe diameters are the same, and the pipeline resistance is negligible, the pump head is equal to the lifting height.

What factors are likely to affect the head of slurry pump china?

slurry pumpis a newly developed Slurry pump. This series of slurry pump has the characteristics of reasonable structure, high efficiency, reliable operation and convenient maintenance. It can be widely used in electric power, metallurgy, mining, coal, etc. , Building materials, chemical industry and other industrial sectors transport corrosive or corrosive slag. Especially suitable for power plant ash and slag transportation, it is an ideal pump for ash and slag removal. It can be used in series in multiple stages within the allowable working pressure range, and its allowable working pressure is 3.6MPa. The overcurrent components are interchangeable. The overall installation dimensions are exactly the same, only the bearing types are different. The transmission part adopts a horizontal middle-open type thin oil lubrication bracket, and is provided with two sets of internal and external water cooling systems.

There are several factors that affect the height of the sandstone ore slurry pump lift:

First, the relationship between the pump and the blade outlet placement angle β2A

When the other values are constant, the larger the blade exit angle, the theoretical head will increase as the flow increases, and the smaller the blade outlet placement angle, the smaller the head of the sandstone slurry pump will be as the flow increases. .

Second, the relationship between the number of pumps and blades.

When the other values are fixed, regardless of the flow loss, the larger the number of blades, the larger the theoretical head. This is because the impeller with a finite blade can give liquid less energy than an impeller with an infinite blade.


Slurry Pump

Slurry Pump

Relationship between pump and speed

According to Euler's equation, the higher the speed, the larger the theoretical head.

When the model of the slurry pump is determined, the total head is constant; the lost head mainly comes from the resistance of the pipeline. The smaller the diameter of the pipe, the larger the resistance is, and therefore the larger the lost head is. Instead of increasing the head, it will decrease, which will cause the efficiency of the slurry pump to decrease. Similarly, when the small-diameter slurry pump is pumped by a large water pipe, the actual head of the sandstone slurry pump will not be reduced, but the loss head will be reduced due to the reduction of the resistance of the pipeline, so that the actual head has Has been improved.


 
Slika od JIANBO ZHANG
od JIANBO ZHANG - sobota, 20. junij 2020, 06:01
vidno vsem

The lift of a centrifugal pump is also called the pump's head. It refers to the height at which a pump can lift water and can be understood as the energy obtained by a unit weight of fluid passing through the pump. The pump head size depends on the structure of the pump (such as the size of the impeller diameter, the bending of the blade, etc., and the speed).

At present, the pump head cannot be accurately calculated theoretically. Generally, it is measured experimentally to obtain the pump performance curve, and then the slurry pump selection calculation is performed based on the pump performance curve.

Pump head, flow and power are important parameters for examining the performance of a pump.

Note: The lift of a centrifugal pump is different from the lift height (lifting height). The lift height of a pump refers to the vertical height at which the pump sends liquid from a low place to a high place. Only when the inlet and outlet containers of the pump are at 0.1MP, the inlet and outlet pipe diameters are the same, and the pipeline resistance is negligible, the pump head is equal to the lifting height.

What factors are likely to affect the head of slurry pump china?

slurry pumpis a newly developed Slurry pump. This series of slurry pump has the characteristics of reasonable structure, high efficiency, reliable operation and convenient maintenance. It can be widely used in electric power, metallurgy, mining, coal, etc. , Building materials, chemical industry and other industrial sectors transport corrosive or corrosive slag. Especially suitable for power plant ash and slag transportation, it is an ideal pump for ash and slag removal. It can be used in series in multiple stages within the allowable working pressure range, and its allowable working pressure is 3.6MPa. The overcurrent components are interchangeable. The overall installation dimensions are exactly the same, only the bearing types are different. The transmission part adopts a horizontal middle-open type thin oil lubrication bracket, and is provided with two sets of internal and external water cooling systems.

There are several factors that affect the height of the sandstone ore slurry pump lift:

First, the relationship between the pump and the blade outlet placement angle β2A

When the other values are constant, the larger the blade exit angle, the theoretical head will increase as the flow increases, and the smaller the blade outlet placement angle, the smaller the head of the sandstone slurry pump will be as the flow increases. .

Second, the relationship between the number of pumps and blades.

When the other values are fixed, regardless of the flow loss, the larger the number of blades, the larger the theoretical head. This is because the impeller with a finite blade can give liquid less energy than an impeller with an infinite blade.


Slurry Pump

Slurry Pump

Relationship between pump and speed

According to Euler's equation, the higher the speed, the larger the theoretical head.

When the model of the slurry pump is determined, the total head is constant; the lost head mainly comes from the resistance of the pipeline. The smaller the diameter of the pipe, the larger the resistance is, and therefore the larger the lost head is. Instead of increasing the head, it will decrease, which will cause the efficiency of the slurry pump to decrease. Similarly, when the small-diameter slurry pump is pumped by a large water pipe, the actual head of the sandstone slurry pump will not be reduced, but the loss head will be reduced due to the reduction of the resistance of the pipeline, so that the actual head has Has been improved.