I don’t know what air compressor you are talking about? Below I will provide you with some screw machine installation and operation matters for your reference!

Common knowledge about air compressor pipeline installation

Use carbon steel pipes of sufficient size so that the pressure loss on the entire air pipe does not exceed 0.021MPA. Use the pressure loss of the compressed air piping system. / loss is maintained at 10% (from compressor to farthest point). The diameter of the exhaust pipe should be at least as large as the compressor exhaust port.

1. If adjustment control is required, install a bypass pipe on the exhaust pipe. This bypass pipe can also be used to connect a backup air compressor.

2. Several pressure gauges can be installed on the entire system for monitoring. Install a side channel. This bypass channel can also be used to connect a backup air compressor.

3. Several pressure gauges can be installed on the entire system for monitoring. The installation locations include gas storage tanks, gas distribution bags, pneumatic tools, production equipment and piping systems.

4. Use a radius elbow (R>3~5D), and use a ball valve or butterfly valve. to reduce the pressure drop on the pipeline.

5. The compressed air pipeline needs to have an inclination of 6.35MM for every 0.3M, and a water valve for discharging condensed water is semi-installed.

6. The ideal system for compressed air is an annular design. , supplied with two-way air flow. Dendritic pipelines can also be used.

7. Annular pipeline: The pressure at each point is stable, the pressure difference is small, the flow rate is low, the pipeline is relatively long, and the energy efficiency is high.

8. Dendritic pipeline: The pressure at each point is relatively stable, which depends on the gas consumption of the branch pipe. The pipeline is relatively short and the investment is low.

9. When connecting the air pipe from the main air pipe, it should be as close as possible to the gas equipment. The branch pipes should be connected from the top of the main pipe.

10. Compressed air pipelines usually use carbon steel pipes as exhaust pipes, but black iron, galvanized, copper or stainless steel pipes can also be used. But plastic pipes must not be used

11. When the P>0.7MPA in the connecting pipeline, it is best to use flange connection

12. Factors such as air leakage and factory expansion need to be considered to ensure Eliminate obsolescence in your compressed air system.

13. The main air pipe should be designed according to the maximum air supply volume, including full-load production and plant expansion plans

General requirements and precautions for compressor pipeline installation

< p>1. When the total length of the main pipeline in the workshop is greater than 200M, in order to ensure sufficient pressure balance of compressed air and sufficient air flow, the inner diameter of the pipeline should not be less than 3IN (1IN=25.4MM).

2. Compressed air freeze-drying equipment should be designed with spare pipelines used during equipment maintenance and be equipped with compressed air check ball valves.

3. When installing an annular closed-circuit main pipeline, it is recommended that the air input end should be designed with an inclination of 1 to 2° toward the farthest end of the pipeline, and an automatic air inlet should be installed at the lowest end of the main pipeline. Or artificial oil and water discharge device and oil and water collection container

4. The compressed air main pipeline should try to avoid sharp turns (inner angle less than 90°); if the main pipeline needs to be fixed on the ceiling, it should avoid cross beams Or various pipelines, etc.; when the air pipeline is "U" shaped, it is recommended to install a drainage device at the bottom of the "U" shaped pipeline to prevent condensation in the compressed air from accumulating at the bottom of the "U" shaped pipeline.

5. When the compressed air branch pipeline is a branch of the main pipeline, a "gooseneck" connection should be used to prevent condensate in the main pipeline from directly entering the branch pipeline.

6. It is recommended to install an oil-water separator with sufficient compressed air filtration flow for each branch pipeline connected to pneumatic tools (such as: SATA 0/424 oil-water separator dedicated to pneumatic tools/pneumatic equipment), so as to Ensure the normal operation and extended service life of pneumatic tools and equipment.

7. In order to ensure the quality of spraying, it is recommended to install a professional oil-water separation device for spraying with high precision of compressed air filtration (filtration precision up to 0.01ΜM) and large air flow (air flow up to 3600L/MIN) in the spray paint room. (such as: SATA 0/444 standard type or SATA 0/244 economical oil-water separator).

8. It is recommended to install a drainage device (automatic drain valve or ball valve) at the end of the branch pipeline about 90 to 120CM away from the oil-water separator to discharge the oil-water condensate in the pipeline from time to time. .

This can also improve the filtration accuracy and service life of the oil-water separator.

9. In order to improve the filtration efficiency of the oil-water separator, when installing the oil-water separator, try to keep it as far away from the air compressor as possible, and the pipeline distance should not be less than 30M, so that the compressed air has sufficient cooling time.

10. If water-based paint is sprayed, an air filtration device with an activated carbon filter must be installed (such as: SATA0/484 three-section oil and water separator with activated carbon filter element), which can not only filter oil, Water and particulate matter can also absorb oil and water vapor in compressed air at the same time to avoid defects in the water-based paint coating.

General guidelines for compressed air pipeline design

Compressed air pipeline design guidelines:

The compressed air pipeline system meets the user's requirements for the flow, pressure and Quality requirements should also be comprehensively determined from aspects such as reliable gas supply, energy conservation, investment reduction, and convenient maintenance. Specifically, there are the following principles:

1. Consider from the pressure requirements:

When the compressed air system has two or more pressure requirements, it can be considered in the following way :

a) The pipeline system is designed according to the maximum air supply pressure, and part of the pressure supply can be satisfied by installing a pressure reducing device on the pipe.

b) According to the user’s gas pressure, combined with the layout of the workshop or equipment, several pressure levels are divided and gas is supplied through pipeline systems with different pressures.

2. From the perspective of air quality requirements:

a) Use an untreated compressed air pipeline system. For some gases that require high quality, add new ones to the pipeline. Treatment equipment purification to meet.

b) Design two pipeline systems throughout the plant. One is a general air system and the other is a purified air system.

3. Considering the characteristics of gas consumption:

The instantaneous maximum gas consumption of some gas equipment is very different from the average gas consumption (such as air hammer, shot peening, etc.). In order not to affect the gas consumption of other equipment, a dedicated gas supply pipe is generally used or a gas storage tank is added near such gas consumption to buffer the load.

4. From the perspective of energy saving:

a) When the factory uses several different pressures of compressed air at the same time, it uses several air compressors of different pressure levels to form different pressures. Grade pipelines can effectively save energy, but will increase infrastructure investment, so an economic comparison should be made before deciding on a specific gas supply plan.

b) According to surveys, the leakage of compressed air pipelines in some factories can reach 20%. Therefore, when only a few workshops in the factory use compressed air for a certain period of time, a separate on-site supply can be considered. air to reduce air leakage in long pipelines.

5. From the perspective of investment and maintenance:

a) The common dendritic pipeline system is beneficial to saving investment.

b) The primary radiant piping system centered on the air compression station, or the secondary radiant piping system at the intermediate distribution station is beneficial to the management and maintenance of the compression system and equipment.

6. From the perspective of gas supply reliability:

a) The annular pipeline system can reliably supply gas and ensure the stability of each gas supply pressure. The air supply of other pipes will not be affected when the pipe is repaired.

b) When it is necessary to ensure uninterrupted gas supply to all gas consumption points, a double-branch pipeline system can also be used. However, this type of system requires twice as much investment in pipes as a single-branch pipeline system, so it can only be used when Special provisions that do not allow gas interruption

Compressed air pipeline installation

5.1 General provisions

5.1.1 In mines, factories and construction industries, compressed air has a wide range of uses. It can be used to drive various pneumatic machinery and pneumatic tools such as pneumatic drills, pneumatic shovels, pneumatic grinding wheels, sand blasting, spray painting, solution stirring, and conveying powder. It can also be used to control automated instrumentation, pressure vessels, Pipelines, valves, etc. are tested for tightness. Compressed air has the characteristics of rising temperature, high moisture content, grease and dust, and the ability to expand and perform work externally.

5.1.2 This chapter applies to the construction of compressed air pipeline installation projects in industrial piping projects.

5.2 Construction preparation

5.2.1 Technical preparation

5.2.1.1 Familiar with and review the design drawings and related information;

5.2. 1.2 Investigation and analysis of original construction data;

5.2.1.3 Prepare construction organization design or construction plan, clearly propose the scope and quality standards of construction, formulate a reasonable construction period, and implement power sources such as water and electricity;

5.2.1.4 Prepare construction drawing budget and construction budget.

5.2.2 Material preparation

5.2.2.1 The materials and equipment are confirmed to be qualified, fully prepared, and delivered to the site.

5.2.2.2 All materials shall be inspected for variety, specifications, appearance, etc. when entering the site. The packaging should be in good condition, with no scratches or external impact damage on the surface of the material. Unqualified materials are not allowed to be stored in the warehouse, and qualified materials stored in the warehouse should be classified and stacked.

5.2.2.3 The materials, specifications, models and quality of pipeline components and pipeline supports shall comply with the provisions of the design documents, and shall be visually inspected in accordance with current national standards. Those that fail shall not be used.

5.2.2.4 Major appliances and equipment must have complete installation and operating instructions. During transportation, storage and construction, effective measures should be taken to prevent damage or corrosion.

5.2.2.5 Pipe components and pipe supports should be properly kept during the construction process and should not be confused or damaged, and their color codes or markings should be obvious and clear. Pipe components and pipe supports made of stainless steel and non-ferrous metals must not come into contact with carbon steel during storage. Pipes that cannot be installed temporarily should have their openings closed.

5.2.3 Main machines

5.2.3.1 Machinery: threading machine, bench drill, electric welding machine, cutting machine, bending machine, beveling machine, rolling groove machine, test machine Pressure pump, etc.

5.2.3.2 Tools: workbench, pipe pressure pliers, hacksaw bow, pipe cutter, electric drill, electric hammer, hot melt connection tools, pipe wrench, hand hammer, adjustable wrench, socket wrench, Torx wrenches, chain pliers, pipe bending springs, pipe shears, round expanders, twist chisels, welding pliers, oxygen acetylene bottles, pressure reducing gauges, leather pipes, cutting torches, chain hoists, wire ropes, pulleys, ladders, etc.

5.2.3.3 Measuring tools: level, spirit level, steel tape measure, steel plate ruler, square ruler, welding inspection ruler, line drop, pressure gauge, etc.

5.2.4 Operating conditions

5.2.4.1 The design drawings and other technical documents are complete and the construction conditions are confirmed.

5.2.4.2 The organizational design or construction plan has been approved, necessary technical training has been carried out, and technical briefing and safety briefing have been completed.

5.2.4.3 Arrange the on-site work site and processing workshop warehouse according to the construction plan.

5.2.4.4 The civil work related to pipeline installation has been inspected and qualified, meets the installation requirements, and the handover procedures have been completed.

5.2.4.5 The materials and equipment are confirmed to be qualified, fully prepared, and delivered to the site.

5.2.4.6 The equipment connected to the pipeline has been leveled, aligned, and fixed in place.

5.2.4.7 The processes that must be completed before pipeline installation, such as cleaning, degreasing, internal anti-corrosion and lining, have been completed and accepted.

5.2.4.8 Pipes, pipe fittings, instruments and valves have been verified to be qualified, relevant technical documents are available, and they are confirmed to meet the design requirements.

5.2.4.9 The inside of pipes, fittings, valves, etc. has been cleaned and free of debris. For pipes with special requirements inside the pipe, their quality must comply with the provisions of the design documents.

5.2.4.10 Construction machinery related to pipeline installation has been arranged and implemented, and can meet the technical and progress requirements of construction.

5.3 Key points of material quality control

5.3.1 Compressed air pipelines generally use welded steel pipes or seamless steel pipes. When DN>200mm, steel plate coiled pipes are used. Pipeline valves adopt stop valves, DN=15~40mm adopts J11T-16 internal thread stop valve, DN≥50mm adopts J41T-16 flange stop valve.

5.3.2 Pipe components and pipe supports must have quality certificates from the manufacturer, and their quality shall not be lower than the current national standards. 5.3.3 All materials should be inspected for variety, specifications, appearance, etc. when entering the site. The packaging should be in good condition, with no scratches or external impact damage on the surface of the material.

Unqualified materials are not allowed to be stored in the warehouse, and qualified materials stored in the warehouse should be classified and stacked.

5.3.4 The materials, specifications, models and quality of pipeline components and pipeline supports should comply with the provisions of the design documents, and appearance inspection should be carried out in accordance with the current national

standards. Those who are qualified are not allowed to use it.

5.3.5 Major appliances and equipment must have complete installation and operating instructions. During transportation, storage and construction, effective measures should be taken

to prevent damage or corrosion.

5.3.6 Before installing the valve, the packing should be checked, and the gland bolts should have adjustment margin; the model should be checked according to the design document, and its type should be determined according to the flow direction of the medium

Installation direction.

5.3.7 The valve must have a factory certificate and a nameplate from the manufacturer. The nameplate should indicate the nominal pressure, nominal diameter, working temperature and working medium

working medium.

5.3.8 The number of safety valve opening and seat back tests should be no less than 3 times, and the user unit and relevant departments should supervise and confirm on-site during the test process.

After passing the test, a lead seal should be made and the safety valve constant pressure record should be filled in.

5.3.9 Pipe components and pipe supports should be properly kept during the construction process and should not be confused or damaged, and their color codes or markings should be obvious and clear. Pipe components and pipe supports made of stainless steel and non-ferrous metals must not come into contact with carbon steel during storage. Pipes that cannot be installed temporarily should have their openings closed.

5.4 Compressed air pipeline installation

5.4.1 Classification of compressed air pipelines

It can be divided into three categories according to working pressure: high-pressure pipeline, medium working pressure 10.0MPa;

Medium pressure pipeline, medium working pressure is 1.0~10.0MPa;

Low pressure pipeline, medium working pressure is 0.2~1.0MPa.

5.4.2 Installation requirements for compressed air pipelines

5.4.2.1 Lay them underground, but they can also be laid on overhead heating or gas pipeline pillars. When laying underground, try to be consistent with Thermal pipelines should be laid in the same trench, and the direct burial should be buried below the freezing line. An anti-corrosion insulation layer should be added to the outside of the pipeline. The type of insulation layer should be determined according to the corrosiveness of the soil layer. When laying pipelines directly underground and passing through railways and important highways, they should be placed in casings made of steel or cement. Both ends of the casing should extend 1m from the road side and 3m from the railway side. Ensure that the gap between the pipeline and the casing is at least 20mm. At the same time, both ends of the casing should be filled with hemp fiber soaked in asphalt.

5.4.2.2 There should be more than two entrances, and the equipment and accessories at the entrance should be installed in a location that is convenient for operation and management. Pipes can be laid underground or overhead.

On the premise of meeting safety requirements, we strive to lay them in conjunction with other pipes. A control valve should be installed at the beginning of the main pipe laid along each row of columns.

5.4.2.3 The branch pipe is connected to the side. To facilitate construction, the branch pipe and the main pipe can generally adopt angles of 90°, 60°, 30°, 15°, etc. Water collectors should be installed at the end and lowest point of the pipe. Whenever pipes pass through walls or floors, casings should be installed.

5.4.2.4 Pipe connection

1 Welded steel pipe: DN≤50mm, using threaded connection. The filler is white lead, oil, linen wire or polytetrafluoroethylene raw material tape; DN>50mm, it is advisable to use electric welding for connection.

2 Seamless steel pipes: DN≤50mm, connected by oxygen-acetylene welding; DN>50mm, connected by electric welding: Steel plate coiled pipes are connected by electric welding.

5.4.2.5 Slope:

i=0.002~0.003 downstream slope.

5.4.2.6 Quality requirements:

Pipe supports should be installed firmly, in correct positions, and without skewing. Verticality of the riser: The allowable deviation is 12mm when the length is more than 4m, and the allowable deviation is 4mm when the length is less than 4m. The slope deviation of horizontal pipes shall not exceed ±0.0005.

5.4.3 Compressed air station process pipeline installation

Chapter 4 Air compressor installation knowledge

Installation standards and requirements

A ． Installation environment layout requirements

1. In order to meet the needs of development, the computer room should leave room for expansion in the general plan.

2. The air compressor sucks air directly from the atmosphere. In order to reduce the wear, corrosion and explosion possibility of the unit, the machine room and places that emit explosive, corrosive, toxic gases, dust and other harmful substances must be There must be a certain distance. Since the compressor dissipates a lot of heat and the temperature inside the machine is very high especially in summer, the machine room should be oriented so that there is good ventilation between the machines and to minimize sun exposure.

3. Although the compressor has a box, it is strictly prohibited to be exposed to rainwater, so the compressor should not be installed in the open air.

4. The compressor room is an independent building.

5． The compressor room must be equipped with fixed fire extinguishing carbon dioxide fire extinguishing equipment, and its manual switch must be set outside the danger zone. And always within reach. Fire extinguishing equipment carbon dioxide fire extinguishers or powder fire extinguishers should be placed near the protected target, but outside the danger zone.

B. Equipment room installation requirements

1. The ground should be a smooth cement floor, the inner surface of the wall should be whitewashed, the compressor base should be placed on the concrete floor, and the plane level should not be greater than 0.5/1000 (mm) . There are grooves 200mm away from the unit so that oil and water can flow away from the groove when the unit is stopped for oil change, maintenance or cleaning the ground. The size of the groove is determined by the user.

2. When placing the compressor unit on the ground, ensure that the bottom of the box is in good contact with the ground to prevent vibration and increase noise.

3. For qualified users, sound-absorbing panels can be affixed to the walls of the computer room to further reduce noise, but it is not appropriate to use hard surface materials such as ceramic tiles to decorate the walls.

4. Since air-cooled compressors are greatly affected by ambient temperature, the machine room should be well ventilated and dry. The heat exchange air can be led outdoors through an air duct or an exhaust fan can be installed to control the ambient temperature of the compressor. Within -5℃～40℃.

5. There is less dust in the computer room, the air is clean, and it does not contain harmful gases and corrosive media such as sulfurous acid. Depending on the nature of the products your company processes, the air inlet should be equipped with a primary filtration device. The effective circulation area of ??the window should be greater than 3m2

C. Power supply and peripheral wiring requirements

1. The main power supply of the compressor is AC (380V/50Hz) three-phase, and the freeze dryer is AC (220V/50HZ). Please confirm the power supply.

2． The voltage drop cannot exceed 5% of the rated voltage, and the voltage difference between each phase should be within 3%.

3． The compressor power supply must be equipped with an isolation switch to prevent short circuit and phase loss operation.

4． Check the secondary circuit fuse and select an appropriate no-fuse fuse switch according to the power of the compressor.

5. It is best to use a separate power system for the compressor to avoid using it in parallel with other power consuming systems. Especially when the power of the compressor is large, it may be damaged due to excessive voltage drop or three-phase The current imbalance causes the compressor to overload, causing the protective device to trip.

6. The ground wire must be grounded to prevent danger caused by leakage. It must not be connected to the air delivery pipe or cooling water pipe.

D. Requirements for pipeline installation

1. The air supply port of the unit has a threaded connection and can be connected to your air supply pipeline. Please refer to the factory instructions for installation dimensions.

2. In order to avoid affecting the operation of the entire station or other units during maintenance, and to reliably prevent compressed air from flowing back during maintenance, a stop valve must be installed between the unit and the gas storage tank.

3. In order to avoid affecting the gas consumption during filter maintenance, each filter pipeline should be equipped with a spare pipeline.

4. The branch pipeline must be connected from the top of the main pipeline. out to prevent condensation water in the pipeline from flowing down to the compressor unit.

5. Keep the pipeline as short and straight as possible, and reduce elbows and various valves to reduce pressure loss.

E. Connection and arrangement of air pipelines

1. The main pipeline of the compressed air pipeline is 4 inches, and the branch pipelines use existing pipelines as much as possible.

2. The pipeline should generally have a slope greater than 2/1000, with a drain valve (screw plug) at the low end. The pipeline should have as few bends as possible and as few straight valves as possible.

3. When the underground pipeline passes through the main road surface, the pipe top burial depth shall not be less than 0.7m, and the secondary road surface shall not be less than 0.4m.

4. The installation location of pressure and flow instruments and their The surface size should enable the operator to clearly see the indicated pressure, and the pressure scale range should be such that the working pressure is at 1/2 to 2/3 of the dial scale.

5. After the system is installed, air pressure strength and air tightness tests should be carried out, and hydraulic pressure tests should not be carried out. It is carried out at a pressure of 1.2 to 1.5 times of the same gas, and it is qualified if there is no leakage.

F. Anti-corrosion of air pipelines

After the installation is completed, the pressure test is passed, and the dust, dirt, rust spots, welding slag, etc. on the surface are removed, paint is used as anti-corrosion. deal with. Painting pipelines can prevent corrosion and extend the service life of pipelines. It can also facilitate identification and appearance. Generally, the surface is coated with anti-rust paint first, and then the specified mixed paint is applied.

G. Lightning protection of air pipelines

Once the high-voltage electricity induced by lightning in the pipeline is introduced into the workshop pipeline system and gas equipment, it will cause equipment and personal safety accidents. Therefore, the pipeline should be well grounded before entering the workshop.

E. Pipeline pressure loss

When gas flows in the pipe, friction resistance is generated in the straight pipe section; local resistance is generated in valves, tees, elbows, reducers, etc. , resulting in gas pressure loss.

Note:

The total pressure drop in the pipeline should also be added to the partial pressure loss caused by elbows, reducing pipes, tee joints, valves, etc. These values ??can be obtained from the relevant It can be found in the manual

H. Ventilation of the compressor air pressure system

No matter whether the user is using an oil-free machine or an oil-injection machine, or whether the user is using an air-cooled compressor Whether it is a compressor or a water-cooled compressor, the ventilation problem of the air compressor room must be solved. According to our past experience, more than 50% of air compressor failures are due to neglect or misunderstanding in this aspect.

When the air is compressed, a large amount of heat will be emitted. If this heat cannot be discharged from the air compressor room in time, the room temperature of the air compressor room will gradually rise, so that the air compressor suction port The temperature will get higher and higher. Such a vicious cycle will cause the air compressor exhaust temperature to be high and trigger an alarm. At the same time, because the density of high-temperature air is small, the gas production will be reduced. For water-cooled compressors, most of the heat is transferred to the cooling water through the heat exchanger, and the cooling water takes away the heat. At this time, only a smaller ventilation fan needs to be set up to take away a small part of the heat emitted by the main motor. Just go. For air-cooled compressors, a large amount of fresh air is needed to exchange the heat generated during the compression process. Then the inlet of the fresh air must be considered. The inlet should preferably be close to the cooling air inlet of the air compressor. (The air inlet for the compression section should preferably also be located close to the fresh air inlet). If necessary, a separate air duct can be set up to introduce fresh air, so as to avoid the hot air in the air compressor room from affecting the cooling process. Of course, this depends on the structure of the air compressor room and the customer's situation. Generally speaking, air ducts should be set up to guide the hot air that has undergone heat exchange out of the air compressor room. If necessary, a fan or blower should be installed at the outlet to enhance the hot air export effect. The fresh air inlet mentioned above needs to be set at a low position in the air compression room, while the hot air outlet (including the corresponding fan or blower) must be set at a high position. Because the hot air has a low density and will generally stay at a high position, there will be problems with this setting. It is conducive to the export of hot air, and at the same time, it prevents the discharged hot air from entering the air inlet again and causing a short circuit of the air flow. Another thing to note is that it is best to set the fresh air inlet and hot air outlet on two opposite walls. The purpose of this is also to prevent the exhausted hot air from entering the air inlet again and causing an air flow short circuit. It is best to set up a dust mesh at the fresh air inlet to prevent more dust or catkins and other debris from entering the air compressor room. It is best to set up a rainproof cover at the hot air outlet to prevent rainwater from flowing into the heat exhaust duct. Regardless of the air duct of the air inlet or the air outlet, large reductions or elbows should be avoided, because this will cause relatively large ventilation resistance and affect the ventilation effect. Because the air in the air compressor room is constantly used for compression and cooling, and the supplement of fresh air is generally done passively, a certain negative pressure is generally maintained in the air compressor room, which is normal. However, if the negative pressure value exceeds the allowable value, it means that the size of the air inlet or the air intake volume needs to be improved, because too much negative pressure value will cause the cooling effect to deteriorate and the exhaust volume to decrease.

Although the above content is relatively simple, it is very important. If we can work together with users to do this well, 50% of the possibility of malfunctions will be eliminated. It can be seen that we should spend more energy in this regard for us and users. It's all very worthwhile.

Selection of the installation site

1. The selection of the installation site of the air compressor is most neglected by the staff. Often, after purchasing the air compressor, they just randomly find a place and install the piping. Use it immediately without any prior planning. Little did they know that such hasty results would lead to future air compressor failures, maintenance difficulties and poor air quality. Therefore, a proper installation location is a prerequisite for the correct use of the air compressor system:

(1 ) Choose a spacious location with good lighting to facilitate the space and lighting required for operation, maintenance, and repairs.

(2) Choose a place with low air humidity, less dust, fresh air and good ventilation, and avoid water mist, acid mist, oil mist, dusty and fiber-rich environment.

(3) According to the requirements of GB50029-2003 "Compressed Air Station Design Code", the heating temperature in the machine room of the compressed air station should not be lower than 15°C, and the temperature in the machine room during non-working hours should not be lower than 5°C. .

(4) When the suction port of the air compressor or the cooling air suction port of the unit is located indoors, the indoor ambient temperature should not exceed 40°C.

(5) If the factory environment is poor and dusty, pre-filtration equipment must be installed to ensure the service life of the air compressor system parts.

(6) When the exhaust volume of a single unit is equal to or greater than 20m3/min, and the total installed capacity is equal to or greater than 60 m3/min of a compressed air station, it is appropriate to install lifting equipment for maintenance. The capacity should be determined based on the heaviest component of the air compressor unit.

(7) Reserve passages and maintenance space. According to the requirements of GB50029-2003 "Compressed Air Station Design Code", the width of the passage between the air compressor unit and the wall is 0.8~ based on the exhaust volume. 1.5m distance.

2. Matters needing attention when piping compressed air pipelines

(1) When piping the main pipeline, the pipeline must have an inclination of 1° to 2° to facilitate the piping. The discharge of condensed water is shown in Figure 1 and Figure 2.

(2) The pressure drop in the piping pipeline shall not exceed 5% of the operating pressure of the air compressor. Therefore, it is best to use a pipeline larger than the design value when piping. The calculation formula is as follows:

Calculation of pipe diameter d= mm= mm

Where Q pressure - flow rate of compressed air in the pipe m3/min

V - flow rate of compressed air in the pipe m/s

QAuto - Air compressor nameplate scalar m3/min

pExhaust - Air compressor exhaust absolute pressure bar (equal to the air compressor exhaust pressure plus 1 atmosphere)< /p>

(3) The branch pipeline must be connected from the top of the main pipeline to prevent the condensation water in the main pipeline from flowing down to the working machinery or backflowing into the air compressor.

(4) Do not reduce or enlarge the pipeline arbitrarily. The pipeline must use a reducer tube, as shown in Figure 2. If a reducer is not used, turbulence will occur at the joint, which will cause a large pressure drop and also have a negative impact on the life of the pipeline.

(5) If there is purification buffer equipment such as a gas tank and a dryer after the air compressor, the ideal piping sequence should be air compressor + gas tank + dryer. The gas storage tank can filter out part of the condensed water and also has the function of lowering the gas temperature. Introducing compressed air with lower temperature and less water content into the dryer can reduce the load of the dryer.

(6) If the amount of air used is large and the time is short, it is best to install an additional air storage tank as a buffer. This can reduce the number of loading and unloading times of the air compressor and affect the air pressure. There are great benefits to the service life of the machine.

(7) Minimize the use of elbows and various valves in pipelines.

(8) The ideal piping is for the main line to surround the entire factory, so that compressed air in both directions can be obtained at any location. For example, when the gas consumption of a branch line suddenly increases greatly, the pressure drop can be reduced. In addition, an appropriate valve group should be configured on the annular main line to facilitate cutting off during maintenance.

(9) When the air output pipes of multiple air compressors are connected in parallel, there is no need to install a check valve at the output end of the air compressor.

3. Foundation of the air compressor

The foundation of the air compressor should be built on hard soil, and the foundation level should be smoothed before installation to avoid vibration. If it is installed upstairs, anti-vibration measures must be taken, otherwise the vibration will be transmitted to the downstairs or extreme vibration will occur, which can easily cause harm to the air compressor and the building. Generally, the vibration speed of a screw air compressor is below 11.2 mm/s (belt drive) and 7.1 mm/s (coupling drive). There is no need to build a special foundation. It is recommended to build a building with a height of about 120 mm and a length and width slightly larger than the empty space. The platform foundation of the bottom area of ??the press is convenient for sewage discharge.

4. Cooling system

The water quality standards for cooling water used in water-cooled air compressors should comply with the provisions of GB50050 "Design Code for Industrial Circulating Cooling Water Treatment". When there is softened water available within the enterprise and the system is economical and reasonable, softened water can be used as the circulating water in the system. The main purpose is to prevent the calcium and magnesium plasma in the water from chemically reacting in the cooler due to high temperature, and finally forming scale in the cooler, thereby affecting the cooling efficiency of the cooler. The cooling water pressure is generally between 0.15 and 0.4MPa, and the cooling water outlet temperature should be maintained between 6°C and 10°C higher than the inlet temperature. The cooling water inlet pipe should be equipped with a filter, and the inlet and outlet pipes should be equipped with pressure gauges, thermometers and stop valves respectively.

Air-cooled air compressors must pay attention to their ventilation environment. The air compressor must not be placed near high-temperature machinery or in a closed space with poor ventilation to avoid shutting down due to high exhaust temperature. If it is placed in a closed space for use, air intake and exhaust equipment must be installed. The air inlet is located at the lower part of the computer room, and the air exhaust port is located at the upper part of the computer room to facilitate cold air circulation. Generally speaking, the inlet and exhaust air volumes must be greater than the cooling exhaust volume of the air compressor.

5. Power system

When distributing power to the air compressor, the correctness of the power supply voltage must be ensured.

Select the correct power cord diameter based on the power of the air compressor used. Do not use small power cords, otherwise the power cord will be burned due to high temperature due to excessive load. The power cord must use multi-stranded copper core cable, three-phase four-wire system, one phase of which is the ground wire.

It is best to use a separate power system for the air compressor. In particular, avoid using it in parallel with other large power-consuming systems. Otherwise, it may cause air compressor failure due to excessive voltage drop or unbalanced three-phase current. The main motor of the compressor is overloaded and shuts down, especially high-power air compressors. The load of the power supply network should be uniform, the voltage fluctuation should be within ±5%, and the three-phase voltage imbalance is allowed within ±1%. There should be no connection points in the middle of the power supply cable from the power distribution cabinet to the air compressor.

Select an appropriate air switch based on the power of the air compressor to maintain the safety of the power system and maintenance.

The grounding wire of the power system should be ensured, and the grounding wire should not be directly connected to the compressed air delivery pipe or cooling water pipe.

6． Appendix

1kW is equivalent to 2 amps of rated current, and 1 square millimeter of copper wire can pass 4 to 6 amps of current.

Commonly used wire (rubber copper wire) specifications (number of cores × cross-section mm2 + number of cores × cross-section mm2)

3×11×6, 3×16+1×10, 3×25+1× 10. 3×35＋1×10

3×50＋1×16, 3×71×25, 3×95+1×35

The supporting capacity of the low-voltage 380V transformer is 3 times the rated capacity of the motor , the supporting capacity of the high-voltage 6000V transformer is 2 times the rated capacity of the motor.