The compressor for sandblasting. How to choose?

Sandblasting. This is a type of processing of metal and products of stone or glass, in which the surface of the product is damaged by particles of sand or other abrasive sprayed by a stream of compressed air. Sandbrown equipment is often used in car services and workshops, when it is necessary, for example, to remove the old paint from the body or disks. During sandblasting, abrasive particles create scratches and notches on the surface of metal, thus preparing the body for painting. Some manufacturers of paint themselves indicate what kind of roughness of the surface should be for effective application of their products. Sandstrokes are also used to clean brickwork from plaster, removal of soot and even erasing graffiti. Glass processing using sandblasting deprives it of glossy shine. This is called decorative matting of glass.

The selection of a compressor for sandblasting

For sandblasting, a sandblasting apparatus and a compressor itself is necessary, which provides the supply of compressed air to the sandstone. Depending on the method of using sandblasting equipment, compressors may differ. If you are interested in a compressor for sandblasting, which will be used in a car service, then a small piston compressor with a capacity of 0 will be enough.7-1 cubic meters.m/min and pressure 6-8 bar. If we are talking about the industrial use of sandblasting equipment, then a more powerful screw compressor with a capacity of 5-6 cubic meters will be required here.m/min and pressure more than 10 bar. It is also worth considering. That compressed air supplied to sandblasting should not contain moisture and oil particles, so it is worth using receivers, filters and drainages.

Calculation of compressor performance

We decided to buy a compressor for sandblasting equipment?

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How to choose a compressor for a sandblasting apparatus

When buying a sandblasting apparatus, many do not pay sufficient attention to its key component. compressor. It is he who is responsible for the speed of cleaning and the consumption of abrasive. You can purchase a huge amount of snot and nozzles, but there will be little use without a proper supercharger.

Pressure or performance.

The main disputes are held between the 2 characteristics: performance or pressure, which to give paramount importance when choosing? High performance makes it possible to use a larger number of nozzles for work, increasing the total cleaning rate. The pressure is responsible for the force of contact of the abrasive with the surface. There are three types of application:

5-8 bar-processing of most metals;

9-12 bar-removal of varnishes of high resistance.

The higher the pressure. the longer the path along which the mixture passes without losing speed, but try to use the minimum sleeve length, if possible.

Compressor performance is its key characteristic, which determines the performance of cleaning. For example, compressors with a capacity of 2.2 kW. and 37 kW. can develop the same pressure of 7 bar, but at the same time their performance is different. The first can “issue” performance up to 400 l/min (0.4 cubic meters.m/min.), and the second will give 5500 l/min (5.5 cubic meters.m/min.). It is clear that the second compressor will provide more necessary conditions for sandblasting to clean.

The choice of the required characteristics

Before buying a compressor, it is necessary to decide which air flow is needed for specific needs. If you apply less than the applied pressure, it will not be possible to achieve working values, performance and processing speeds. In other words, a stream that should be 8 bar should be 2 times weaker, which is why the abrasive will beat on the working surface worse, and in some cases it simply spills out of the nozzle without the proper effect. So, in order to more accurately determine the characteristics of the compressor, we must proceed from the following values:

clearly the picture is shown in the table below:

In this table, sand was taken with a density of 1600 kg/m3. Additionally, it is necessary to take into account not only the diameter of the output, but also its type, length, fraction of the abrasive (weight and size of sand and fractions are very different). Most of the values ​​are indicated in the technical documents of the compressor.

Differences between compressor types.

Today the market is represented by two types of compressors: piston and screw. The first option is categorically not recommended for long static work. Compressed air is prone to pulsation, so the abrasive periodically clicks and the nozzle “sneezes”. They are good for short “spitting” working modes and small volumes of work.

Screw compressors perfectly show themselves with long monotonous work, continuously supplying a mixture of sand and air. They are economical, do not require careful maintenance and easy to use.

Also, when choosing, it is necessary to pay attention to the type of engine, namely diesel and electric motor. The first is ideal for field work, where often there is simply no way to freeze from the mains. Modern diesel engines have a revolutionary control system: they reduce them when the air flow is reduced and increased with enhanced loads. However, you have to pay high fuel consumption.

The electric motor is much more economical, but needs an expensive turnover control unit. There are options with a capacity of 15 to 100 kW and higher, which imposes certain restrictions on the network. If there is a systematic ability to use an electrical appliance in static mode. use it.

Condensate and temperature regimes

A moisture-oil condensate often appears in the highway and equipment, which greatly reduces the overall productivity of the device or completely inhibiting the operation. Expensive models are equipped with a cyclone separator, but even it is not able to prevent fluid entering into an abrasive. To eliminate problems, it is recommended to use a compressed air cooler or a coarsocent filter. If this is not enough, then a refrigerated drainage is needed. They can be built.in or mounted additionally.

It is strongly not recommended to run the compressor at 5C temperatures and below. But if you have to do this, then you need a “winter package”, t.e. The “cold” start system, which is equipped with a heater and works on special oils that correspond to operational temperature indicators. For example, in mobile diesel compressors Remeza, you can choose such an option as a “winter package”.

Choose a proven equipment

As you know, the process of cleaning the abrasive composition is extremely dusty, while the sand behaves “aggressively”. Do not allow the smallest fractions in the screw compressor blocks so as not to reduce their service life several times. Now manufacturers offer special filters even in relatively inexpensive models, so try to look closely at them.

The second important point is the presence and number of service centers of the compressor manufacturer in your city. Work only with authorized points of sales with your own warranty and post.warranty c. Price is far from a key indicator when buying such a technique.

The right choice of hoses

The compressor equipment is of great importance for its effective operation. This category includes connecting parts, adapters. The length of the hose from the compressor to the nozzle of the sandblasting should not be large, which must be taken into account when buying. It is recommended to purchase an additional hose and “build up” the one that goes from installation to the mixing block of air and sand: this will compensate for the lack of length.

In order for the compressor to work optimally, you need to monitor these moments:

  • exclude a decrease in the diameters of the hoses (the indicator should be 3-4 times larger than the size of the nozzle);
  • make a minimum number of joints and connections;
  • use only durable, reinforced hoses.

How best to operate the compressor

In order for the supercharger to serve for a long time and regularly, you need to monitor compliance with a number of conditions. The master should reduce the amount of dust that falls into the installation, or completely exclude such a phenomenon. You need to use the compressor only in permissible weather conditions, depending on the recommendations of the manufacturer. It will also have to take measures against condensation and damage to the compressor when working in winter.

Condensate neutralization

Condensate appears on the border of pressure transforming during the fence and air compression. After the drops of water hit the output tract, a clump of abrasive occurs, which provokes the consequences:

  • violates the operation of the unit;
  • reduces the quality of grinding surfaces;
  • causes corrosion of metal parts;
  • reduces the number of re.use cycles;
  • increases costs;
  • can cause a breakdown of sandblasting.

High-quality installations are equipped with cyclone detergents (moisture separators). They are placed at the output of the supercharger and help to remove the scondmented fluid, although they are not able to prevent its formation in the future. To neutralize condensate and the prevention of its formation, compressed gas coolers can be used, coalescent filters, but refrigerated dehuminants are considered the most effective.

Oil neutralization

Most often, the appearance of oil in the output air flow is inherent in piston compressors. It, like water, acts on the abrasive mixture and the installation itself negatively: causes the appearance of condensate, which provokes a combination of abrasive. The only difference is that water condensation causes corrosion of parts, and purely oil-no. However, the consequences of its action can be no less unpleasant:

selection, compressor, sandblasting, which, better

To prevent such problems at the compressor output, a special oil cap is put, and it is better to use combined installations with the possibility of “capti” and water condensate.

Work of electric compressors in winter

If the ambient temperature drops below 0 degrees, this can harm the operation of electrical compressors. The launch of the internal combustion engine at such temperatures is difficult. Therefore, when working with sandblasting, in winter you will have to take certain measures.

The electrical compressor housing should contain the heating device. You can make it yourself with the help of a heating cable and a temperature sensor. Nevertheless, in order to avoid dangerous consequences, it is better to buy a compressor already equipped with a package for winter launch.

Reducing the amount of dust in the input tract

To reduce the risk of dust from the collapsing abrasive into the compressor, you can take the following:

  • to the station where the receiver and the supercharger are a single system, bring the hose and take its end far beyond the workplace;
  • In the device where the receiver and the compressor are separated, lengthen the hose going from the supercharger and place it away from the working area.

Another option to prevent compressor damage from dust is to use an automobile or industrial air filter that will need to be regularly cleaned and changed. This will serve as a guarantee of reliable and unreasonable operation of the device for a long time.

A spoon of tar

The air, acting with shocks, knocks down an unevenly distributed abrasive into lumps, as a result of which the sandblast begins to “spit”. To solve this problem, you have to use a rather large receiver and, as a result, a compressor of greater performance.

Another unpleasant moment is a significant release of compressor oil from the pistons. But you can also fight it. To do this, in the air tract, the oil vulgarizer is installed. This is a common problem. The occurrence of moisture condensate can lead to a malfunction of the sandblasting apparatus, and in some cases, it is completely disabled.

The presence of extraneous fluids in the air tract leads to the adhesive of the abrasive and the loss of its makeup. This, in turn, causes violations in the operation of the system and can lead to damage or breakdown of the device. Moisture hit the fraction, sharply accelerates its oxidation, and the oils, on the purified surface. an extremely unfavorable factor.

Pros and cons

In most cases, for cleaning air from condensate, there is enough cooler, but sometimes special refrigerated systems are used. When working on the exit, the question often arises. which type of compressors to give preference, diesel or electrical?

Both the first and the latter have several positive and negative features that should be considered when choosing equipment.

Among the indisputable pluses of diesel engines is autonomy. You are absolutely not attached to power sources. Plus, most of these compressors have a built.in automatic engine control system, which saves fuel with a decrease in air consumption. A similar system for electrical compressors is much more expensive. However, the cost of fuel is quite high. In this regard, diesel compressors should be used solely in cases where there is no access to the industrial power supply network.

Pros and cons of the electrical compressors

Electric installations are much simpler and cheaper in operation. Quite a large part of the offers, suggests a mobile chassis. But at the same time, far from always you will have access to the mains. And even if there is such, it is not a fact that the fishing line for a trimmer will withstand the load of the compressor electric motor. In many models, the engine is so powerful that you can’t turn it on in a regular outlet. Engines of such units can have a capacity of up to one hundred kilowatts, which significantly complicates their use on the exit. However, if there is the possibility of connecting such equipment, its use is preferable, from an economic point of view.

A separate question is related to the use of a compressor at low temperatures. For work at temperatures below 5 °, the so.called winter packages are used. We are talking about installations with cold starting systems and additional premium heating. All of the above measures combine using low.temperature oils corresponding to the climate of application.

Pressure for the sandblasting apparatus. the basis of the right choice

Why exactly?. you ask. Everything is simple: the productivity of the supercharger directly affects the work of sandblasting. If the device indicates the value “A” as the recommended, but you have a pump not on “A”, but less. the sand will be sprinkled, but not as an abrasive substance. Just won’t grab the pressure to clean the part.

The parameter of the working pressure of the sandblasting apparatus is measured in liters per minute. This parameter allows you to know how much the compressor needs to pump air in the given time.

For different works you need your pressure for sandblasting. For example, for matting a glass surface (a new type of decoration in construction), a device in the region of 300-500 liters per minute is suitable. For furniture in sandstroy should be at least 700 liters. For pressure installations and for large areas, we need more value. It is customary to use devices with a capacity of 3 to 20 cubic meters per minute.

What type of compressor is suitable for your sandblast pistol

The air consumption for the sandblasting apparatus should be such that its supply to the camera is uniform, so some pump options can win simply due to the design features. Others are less powerful, but more affordable in price. What and how to choose. an individual solution. We will talk about what pumps you can meet in the store.

Features of the piston pump

For small and medium work, this option. you can’t imagine perfectly. The compressor is placed in the garage, unpretentious to temperature differences. However, some troubles with this compressor should also be mentioned:

  • The air mass is entered with pulses, not evenly. All because of the design features.
  • The device for sandblasting is selected only of the oil type, so the chance of oil entering the chamber is very high.
  • The compressor will stop working without a cooling system.

For sandblasting one piston pump is not enough, additional binding is needed. It neutralizes jerks of air supply that harm the work of sandblasting and can cause malfunctions of the entire system.

Regarding the oil: its ingress in the system can crumple sand and clog all the tubes. After that, only thorough flushing and drying of the entire apparatus will help to correct the situation.

Our recommendation is to buy a piston pump along with a finished air pumping station. She is universal because of her design. It enters:

  • Receiver. removes the air supply with jerks and normalizes the operation of the pump;
  • Oil capture. solves the problem with possible leaks;
  • Gearbox. stabilizes the flow of air at the output from the nozzle;
  • Catch. installed in the system for assembling condensate. It harms no less than an oil mixture.

Such a station is suitable for garage work or a small workshop. Properly selected pressure and comfortable tube length will help to work with sandblasting without physical effort and waste of nerves.

Features of a screw compressor

The main thing is to catch on in this version of the pump is no air jerks, as in the piston model. What is the charm of such an apparatus:

  • A minimum of vibration during air pumping;
  • Accurately tuned at the factory, requires minimal maintenance;
  • It works steadily, despite the development of the clock after the purchase.

Why are screw compressors not so popular? There are several reasons. a large price used for stationary tools.

The compressor gives good pressure and is characterized by high performance. It is better if it is used with a storage tank, so as not to strongly load the pump with constant air pumps.

Electric compressor

One of the most popular, along with piston. Among the manufacturers are the abundance of models that differ in price and performance. Take whatever you like.

However, for large.scale use of the pump for sandblast, its effectiveness loses to other options in economic terms. Therefore, you will not meet them in large factories and enterprises. only in the areas of small consumption.

Another moment. without an electrician, the device does not work, and not even 220 volts. It can only be used on centralized lines, without generators and emergency power.

Fuel compressors: diesel and gasoline

The latest pumps on our list, but far from the last advantages. And there are a lot of them:

  • A network is not required;
  • Constant work even in frost. for this, the device is “packaged” in a special winter bag.
  • economical than electrical compressors.

What else are the devices overtake the electrician is more efficiency. With the same mass indicator, fuel engines will be more productive than an electrician. This can be traced not only in compressors, but also in any other technique.

Large workshops and factories are very praised by the fuel pumps for their effectiveness. And what do you use or plan to use you?

Selection of a compressor of suitable power for sandblasting installation

Sandbrown devices exist two types. some are called pressure, have great performance and are used to work at large facilities with a large volume of processed materials. For a drive in pressure installations, a diesel power unit or electric drive is used. The second type is an ejector air supply system. Has a little less performance. Therefore, in ensuring such an air supply system, you can use the option of lower power.

Together with the selection of a compressor, for its stable and normal work, you also need to choose a drainage and filters.

Sandblasting with a small compressor

Compressors relevant for the pressure type of installations

The main difference between the pressure sandblasting installation is the method by which abrasive materials are transmitted to the nozzle. In this type of installation, a mixture of abrasive and air is transmitted along one channel under high pressure. Since pressure sandblasting has high power, it very quickly consumes an abrasive. Therefore, select the diameter of the nozzle and the compressor must be carefully to avoid overrun of the material.

Compressor performance can be selected depending on the diameter of the nozzle and, accordingly, the surface cleaning speed:

The smallest nozzle diameter is 5 mm and its surface processing rate is not more than 6 kV.m. in hour. The most suitable compressor configuration will be an installation with a power of at least 1,500 liters per minute. Pressure can vary from 7 to 12 bar;

nozzle, the diameter of which is 6.5 mm usually does not exceed the surface processing rate of 10 kV.m. in hour. For such a configuration, a compressor with pressure from 7 to 12 bar is suitable, and with a capacity of at least 2300 l/min;

nozzle 8 mm, with a cleaning speed of 15 kV.m. per hour is able to work normally from a compressor with a capacity of 3900 and above and a pressure of 7 to 12 bar;

nozzle with a diameter of 9.5 mm reaches the cleaning speed of 21 square meters.m. in hour. To achieve stable operation at such a speed, you need a compressor with a capacity of more than 5500 l/min. The pressure remains from 7 to 12 bar;

a nozzle of 11 mm will be able to develop the speed of processing of the material to 28 kV.m. in hour. You can work comfortably and without failures by installing a compressor for this, which produces at least 7200 liters of air per minute;

The largest diameter in this series is 12.5 mm, and the performance of such a nozzle is 37 kV.m. in hour. The compressor here will also need the most productive, at least 9600 l/min.

Constructive execution of the compressor installation

When choosing a compressor, it is recommended to decide which engine will be used for the drive. Usually use:

  • Electric motors, they work from the network 220 or 380 in.
  • Gasoline engines consume A-92 gasoline as fuel (usually four-stroke devices are installed, but some manufacturers also install two-stroke engines).
  • Diesel power plants. Solar oil is used as fuel.

Types of drives in household and industrial compressors:

What Size Air Compressor Do You Really Need?

A compressor equipped with a diesel engine. The power is 12 kW, equipped with a 350 liter receiver:

Thermal machines allow compressors to work in autonomous mode. Such installations are operated when performing work at a distance from power sources. They are used to work at remote construction projects:

  • When repairing and building bridges and overpass. There you have to clean the reinforcement from various impurities before the subsequent pouring with concrete solution.
  • When the destruction of objects disabled. The country takes place expanded renovation of the housing stock. You have to carry out the destruction of buildings unsuitable for housing. They contain significant volumes of metal frames. For the removal of construction waste, the reinforcement must be removed. Help in cleaning is provided by sandblasting installations.
  • If necessary, use high.performance equipment compressors based on diesel engines or gasoline engines can produce dozens of cubic meters per minute.

Household compressor uses a single.cylinder device. A blade belt is driven. It was such installations that are widespread in small car repair workshops:

  • Electric equipment with power up to 3.0 3.5 kW is usually operated from the 220 V network. They are connected with ordinary forks. over, the current consumption does not exceed 15 A. Such installations are used in small industries or for individual entrepreneurs involved in car repair.
  • If necessary, use more productive installations, for power to use a network for 380 in. It is able to connect compressors consuming up to 90 100 kW of electricity. Such installations can issue up to 5 10 m³/min. Such devices are installed in industrial enterprises.
  • In factories or in workshops they try to have energy equipment in a separate room. Then the sound from working devices will be less for the hearing of workers. The supply of compressed air from compressors is carried out through pipes.
  • Polypropylene pipes are widely used at modern enterprises. They are easy to weld among themselves, it is easy to organize branching and distribution of different consumers.
  • To evenly upload a network with compressed air near consumers, receivers are installed. They smooth out pressure pulsation. The available reserve allows the operation of technological equipment in optimal modes.
  • They try to place sandblasting for the work near the object of the receiver for 500 800 liters. Then, during operation, a margin of performance will be provided. Work will be performed in stable mode.

Pros and cons

In most cases, for cleaning air from condensate, there is enough cooler, but sometimes special refrigerated systems are used. When working on the exit, the question often arises. which type of compressors to give preference, diesel or electrical?

Both the first and the latter have several positive and negative features that should be considered when choosing equipment.

Among the indisputable pluses of diesel engines is autonomy. You are absolutely not attached to power sources. Plus, most of these compressors have a built.in automatic engine control system, which saves fuel with a decrease in air consumption. A similar system for electrical compressors is much more expensive. However, the cost of fuel is quite high. In this regard, diesel compressors should be used solely in cases where there is no access to the industrial power supply network.

selection, compressor, sandblasting, which, better

Pros and cons of the electrical compressors

Electric installations are much simpler and cheaper in operation. Quite a large part of the offers, suggests a mobile chassis. But at the same time, far from always you will have access to the mains. And even if there is such, it is not a fact that the fishing line for a trimmer will withstand the load of the compressor electric motor. In many models, the engine is so powerful that you can’t turn it on in a regular outlet. Engines of such units can have a capacity of up to one hundred kilowatts, which significantly complicates their use on the exit. However, if there is the possibility of connecting such equipment, its use is preferable, from an economic point of view.

A separate question is related to the use of a compressor at low temperatures. For work at temperatures below 5 °, the so.called winter packages are used. We are talking about installations with cold starting systems and additional premium heating. All of the above measures combine using low.temperature oils corresponding to the climate of application.

Is it worth buying a used compressor

The secondary equipment market is very attractive to low prices, blooms the assurances of sellers in the style of “turned on once for verification”, pleases with a variety of compressors for sandblasting. However, considering the used equipment, you should not succumb to an external impression. Many secondary market products undergo cosmetics, pre.sale preparation. They look great, but this does not affect the nature of the work. If the difficult financial situation makes you pay attention to the used compressors, it is worth remembering some facts.

  • Over time, the compressor parametric inevitably falls. Therefore, if you need to buy equipment with high indicators, it is better to check it carefully using flowstructures and other measuring devices.
  • Diesel compressors have the greatest wear. The piston group of the engine due to constantly high pressure in the chambers is destroyed. The engine consumes more fuel with a lower power given, experiences difficulties in starting with a drop in air temperature. Used equipment, this type will require high maintenance costs, constant cleaning, repair.
  • Sanding compressor in the secondary market. a real dark horse. The equipment may not match the declared characteristics. In addition, worn bearings or rotary blocks will require expensive repairs or replacement, with the involvement of specialists or corporate service. Even worse, if the compressor stops calls the work and breakdown of the deadlines for the execution of orders.
  • Equipment with unexplored types of nodes, lubricants. not the best choice. This is especially true for Chinese industry products and unknown brands. When failing, such a compressor can be repaired, it can be very difficult or impossible due to the inaccessibility of spare parts.

Manufacturers of compressors for sandblasting (if we are talking about serious companies) always declare the duration of normal operation for their equipment. Usually this period is 7-10 years. According to this parameter (focusing on the date of sale or release), you can choose a compressor in the secondary market.

How best to operate the compressor

When working with a sandblasting apparatus, it is necessary not only to achieve high labor productivity and the required cleanliness of surface processing. The operator always faces the next list of tasks.

  • Achieve as many recovery cycles for abrasive material as possible.
  • Prevent unwanted effects on the processed basis.
  • Work.
  • Reduce dust in the entrance tract.

Industrialized nodes will solve the listed problems, some of which must necessarily enter the strapping of an air station.

Condensate neutralization

Condensate always occurs on the border of pressure transformation. When airing and compressing it in the injection, condensate is necessarily formed, which falls on the output tract. The receipt of air drops:

  • causes a combination of abrasive sand, which reduces the quality of processing, can disrupt the operation of the mixing unit;
  • causes corrosion of some abrasive materials, in particular. a steel fraction, which reduces the number of recovery cycles and economic efficiency.

You can neutralize condensate using a compressed gas cooler, after which a cyclone slopper separator is installed. This set of equipment is installed at the output of the supercharger (recommended) or receiver.

Oil neutralization

The presence of oil in the output flow of air is the usual feature of piston devices. The mechanics of the action of such impurities on the abrasive mixture are similar to the effects of condensate. Except that the oil does not cause corrosion. However, it can be extremely undesirable when processing the surface.

When falling on the basis, oil can cause a variety of unpleasant consequences: from violation of the chemical composition, reduction of adhesion, to destruction or change in color. To neutralize such an impurity in the output flow of air, you need a special capture. This node should be installed directly at the compressor output.

Work in winter

A temperature drop below 0% is dangerous for electrical devices. Further decrease in indicators can cause problems of launching internal combustion engines. Diesel is especially difficult to start in the frost. Therefore, if it is planned to work in the winter in the open air, it is necessary to take measures to ensure the appropriate operating conditions of the compressor.

Electric devices are in the case with heating. Such a system can be made independently using thermal attires and a special heating cable.

Reducing the amount of dust in the input tract

The easiest way to eliminate the danger of entering the dust compressor. For this, schemes are used.

  • To the compressor station, where the supercharger and receiver are combined into a single design, an underwater hose is connected, the end of which is excreted far beyond the working area.
  • In systems where the compressor and receiver are separated, it is allowed to lengthen the track coming from the supercharger. The latter is placed away from the working area. Lengthening the hose from the receiver to the sandblast pistol is not recommended.

In some cases, you can apply an automobile or special industrial filter to clean the input air from dust. Such equipment will require periodic cleaning of the node or replacing the working element. However, in cases where there is no way to clean the entrance air in another way, to go to such expenses is quite rational.

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