Product Description

HangZhou CHINAMFG Gas Equipment Co.,Ltd, exporting diaphragm compressor, piston compressor, oxygen generator, gas cylinder and nitrogen generators with good quality and low price.

Piston compressor is a kind of piston reciprocating motion to make gas pressurization and gas delivery compressor mainly consists of working chamber, transmission parts, body and auxiliary parts. The working chamber is directly used to compress the gas, the piston is driven by the piston rod in the cylinder for reciprocating motion, the volume of the working chamber on both sides of the piston changes in turn, the volume decreases on 1 side of the gas due to the pressure increase through the valve discharge, the volume increases on 1 side due to the reduction of air pressure through the valve to absorb the gas.

Compressor for unloading and loading
Product description
This ZW series of oil-free compressors is 1 of the first products produced by our factory in China. The compressors have the advantage of low rotating speed, high component strength, stable operation, long service life and convenient maintenance. It is consist of compressor, gas-liquid separator, filter, two-position four-way valve, safety valve, check valve, explosion-proof motor and base etc. It has the characteristics of small size, light weight, low noise, good sealing, easy installation and easy operation.
This compressor is mainly used for unloading, loading, dumping, residual gas recovery and residual
liquid recovery of LPG/C4, propylene and liquid ammonia. It is widely used in gas, chemical,
energy and other industries, and is a key equipment in gas, chemical, energy and other
industries.

Note: In the process of unloading, the compressor pressurizes the gas from the storage tank and
then presses it into the tanker through the gas phase line, and presses the liquid from the tanker
to the storage tank through the pressure difference of the gas phase to complete the unloading
two process. When the gas phase is pressurized, the temperature of the gas phase will rise. At this
time, it is not necessary to force it to cool, because if the gas phase is compressed and then
cooled, it is easy to liquefy, and the pressure difference of the gas phase is difficult to establish,
which is not conducive to the replacement of the gas phase and the liquid phase. In short, it will
prolong the unloading process time. If residual gas recovery is required, during the residual gas
recovery operation, a cooler can be selected for forced cooling of the gas phase, so as to recover
the residual gas as soon as possible.
The loading process is the opposite of the unloading process.

Propane-Butane Mix Compressor

Number Type Power(kW) Dimension (mm) Loading or unloading (t/h)
  1.  
ZW-0.6/16-24 11 1000×680×870 ~15
  1.  
ZW-0.8/16-24 15 1000×680×870 ~20
  1.  
ZW-1.0/16-24 18.5 1000×680×870 ~25
  1.  
ZW-1.5/16-24 30 1400×900×1180 ~36
  1.  
ZW-2.0/16-24 37 1400×900×1180 ~50
  1.  
ZW-2.5/16-24 45 1400×900×1180 ~60
  1.  
ZW-3.0/16-24 55 1600×1100×1250 ~74
  1.  
ZW-4.0/16-24 75 1600×1100×1250 ~98
  1.  
VW-6.0/16-24 132 2400×1700×1550 ~147

Inlet pressure:≤1.6MPa
Outlet pressure: ≤2.4MPa
Max differential pressure: 0.8MPa
Maximum Instantaneous Pressure Ratio:≤4
Cooling method: Air cooling

The unloading volume is calculated according to the inlet pressure of 1.6MPa, the outlet
pressure of 2.4MPa, the inlet temperature of 40 ºC , and the density of propylene liquid of
614kg/m3. When the working conditions change, the unloading volume will change accordingly,
which is for reference only.

 Piping and Instrumentation Diagram of gas unloading  
 Liquid delivery
At the beginning, open the liquid phase pipeline between the tanker and the storage tank. If the liquid level in the tanker is higher than the storage tank, it will automatically flow into the storage tank. When the balance is reached, the flow will stop. If the liquid phase of the tanker is lower than the storage tank, directly start the compressor, the four-way valve is in the positive position, and the gas is extracted from the storage tank by the compressor and then discharged into the tanker. At this time, the pressure in the tank car rises, the pressure in the storage tank drops, and
the liquid in the tank car flows into the storage tank. (as shown below)

 Surplus liquid recovery
The residual liquid recovery process is the opposite of liquid transfer. After the liquid is delivered, the four-way valve should be reversed, and the dotted line in the figure is closed. At this time, the remaining gas in the tanker is inhaled by the compressor, pressurized and then discharged to the storage tank until the pressure of the remaining gas drops to no recovery value. When recycling, pay attention that the compressor pressure ratio and exhaust temperature cannot exceed the allowable values.

The working principle of the four-way valve
                   

Pull the handle of the four-way valve, when the four-way valve is in the position shown in Figure a, the A side is the intake air, and the gas flows from A to B, through the pipe, the intake filter part, the compressor intake pipe, the compressor, The compressor discharge pipe, the D end flows to the C end, and the C end is the exhaust end.
When the four-way valve is in the position of Figure B, the C end is the intake air, and the gas flows from the C end to the B end, through the pipe, the intake filter part, the compressor intake pipe, the compressor, the compressor exhaust pipe, and the D end It flows to end A, which is the exhaust end.

Reference example for selection and calculation of Propane-Butane Mix unloading compressor
.Selection of compressor inlet and outlet pressure
Saturated vapor pressure of Propane-Butane Mix at 20~36ºC

Temperature(ºC) Atmosphere Temperature(ºC) Atmosphere
20 8.4585 30 11.512
22 9.0125 32 12.212
24 9.5940 34 12.943
26 10.2040 36 13.708
28 10.8430    

In the case of high temperature, the saturated vapor pressure of Propane-Butane Mix is high, so the 16barg (inlet pressure)-24barg (outlet pressure) model is selected to meet the use environment when the temperature is high.
Note: The unit of pressure is kg/cm2

 

  • Compressor Flow Calculation

The specific flow calculation is more complicated and needs to be finally determined according to the calculation formula and experience. Only a simple calculation method is introduced here.

1. Calculate the volume of the tanker
According to the provided operating conditions, first determine the total volume flow required to unload the 15-ton Propane-Butane Mix tanker in 1 hour.
The specific gravity of Propane-Butane Mix is 0.618, so the volume of 15 tons of Propane-Butane Mix is: 15 ÷0.618=24.272m3; and since the tanker is not allowed to be full, it is generally about 80% of the tanker’s volume. The volume is 24.272+15×0.2=27.272, so the volume of the tanker should be 30m3.

2.Calculate flow
When the compressor is unloading, the pressure difference must first be established before the Propane-Butane Mix can be unloaded from the tanker to the storage tank. Generally, the time to establish the pressure difference is 15 minutes, so the actual unloading time is only about 45 minutes, that is, the required displacement is 30 ÷ 45 = 0.66667m3/min; and after the gas is pressurized from 16kg to 24kg by the compressor, the volume will be reduced to about 0.66667 (16 ÷ 24) of the original volume, then the compressor displacement is: 0.66667 ÷ 0.66667 =1m3/min

According to the above calculation, the compressor model is selected as ZW-1.1/16-24


Engineering Specifications

  Compressor Model
ZW-0.8/16-24 ZW-1.0/16-24 ZW-1.5/16-24 ZW-2.0/16-24
Bore(mm) 105 130 136 160
Stroke(mm) 80 80 80 80
Piston Displacement(m3/h)
@min.rpm
@max. rpm
30
48
47
60
58
90
78
120
Compressor Speed
Min. rpm
Max. rpm
460
660
460
660
520
740
510
730
Max. Working Pressure(bar) 24 24 24 24
Max. Brake Horsepower(kw) 15 22 30 37
Max. Discharge Temperature(ºC) 110ºC 110ºC 110ºC 110ºC
max. Compression Ratio
Continuous Duty
Intermittent Duty
4
6
4
6
4
6
4
6

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Lubrication Style: Lubricated
Cooling System: Water Cooling
Cylinder Arrangement: Balanced Opposed Arrangement
Cylinder Position: Angular
Structure Type: Closed Type
Compress Level: Double-Stage
Customization:
Available

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air compressor

Can Gas Air Compressors Be Used in Cold Weather Conditions?

Gas air compressors are generally designed to operate in a wide range of environmental conditions, including cold weather. However, there are certain considerations and precautions to keep in mind when using gas air compressors in cold weather conditions. Here’s a detailed explanation:

1. Cold Start-Up:

In cold weather, starting a gas air compressor can be more challenging due to the low temperatures affecting the engine’s performance. It is important to follow the manufacturer’s recommendations for cold start procedures, which may include preheating the engine, using a cold weather starting aid, or ensuring the proper fuel mixture. These measures help facilitate smooth start-up and prevent potential damage to the engine.

2. Fuel Type:

Consider the type of fuel used in the gas air compressor. Some fuels, such as gasoline, can be more susceptible to cold weather issues like vapor lock or fuel line freezing. In extremely cold conditions, it may be necessary to use a fuel additive or switch to a fuel type that is better suited for cold weather operation, such as winter-grade gasoline or propane.

3. Lubrication:

Cold temperatures can affect the viscosity of the oil used in the compressor’s engine. It is important to use the recommended oil grade suitable for cold weather conditions. Thicker oil can become sluggish and impede proper lubrication, while oil that is too thin may not provide adequate protection. Consult the manufacturer’s guidelines for the appropriate oil viscosity range for cold weather operation.

4. Moisture Management:

In cold weather, moisture can condense more readily in the compressed air system. It is crucial to properly drain the moisture from the compressor tank and ensure the air lines are free from any accumulated moisture. Failure to manage moisture can lead to corrosion, freezing of air lines, and decreased performance.

5. Protection from Freezing:

In extremely cold conditions, it is important to protect the gas air compressor from freezing. This may involve using insulated covers or enclosures, providing heat sources in the compressor area, or storing the compressor in a temperature-controlled environment when not in use. Taking measures to prevent freezing helps maintain proper operation and prevents potential damage to the compressor components.

6. Monitoring Performance:

Regularly monitor the performance of the gas air compressor in cold weather conditions. Pay attention to any changes in operation, such as reduced air pressure, increased noise, or difficulties in starting. Promptly address any issues and consult the manufacturer or a qualified technician if necessary.

By considering these factors and taking appropriate precautions, gas air compressors can be effectively used in cold weather conditions. However, it is important to consult the specific guidelines provided by the manufacturer for your compressor model, as they may have additional recommendations or specifications for cold weather operation.

air compressor

Can Gas Air Compressors Be Used for Gas Line Maintenance?

Gas air compressors can be used for certain aspects of gas line maintenance, primarily for tasks that require compressed air. Here’s a detailed explanation:

1. Clearing Debris and Cleaning:

Gas air compressors can be utilized to clear debris and clean gas lines. Compressed air can be directed through the gas lines to dislodge and remove dirt, dust, rust particles, or other contaminants that may accumulate over time. This helps maintain the integrity and efficiency of the gas lines.

2. Pressure Testing:

Gas line maintenance often involves pressure testing to ensure the lines can withstand the required operating pressures. Gas air compressors can provide the necessary compressed air to pressurize the lines for testing purposes. By pressurizing the gas lines with compressed air, technicians can identify any leaks or weaknesses in the system.

3. Leak Detection:

Gas air compressors can also be used in conjunction with appropriate leak detection equipment to identify and locate gas leaks in the gas lines. Compressed air can be introduced into the lines, and the detection equipment can then identify any areas where the compressed air escapes, indicating a potential gas leak.

4. Valve and Equipment Maintenance:

Gas line maintenance may involve the inspection, maintenance, or replacement of valves and associated equipment. Compressed air can be used to clean and blow out debris from valves, purge lines, or assist in the disassembly and reassembly of components.

5. Pipe Drying:

Gas air compressors can aid in drying gas lines after maintenance or repairs. By blowing compressed air through the lines, any residual moisture can be removed, ensuring the gas lines are dry before being put back into service.

6. Precautions and Regulations:

When using gas air compressors for gas line maintenance, it is essential to follow safety precautions and adhere to relevant regulations. Gas line maintenance often involves working in hazardous environments, and proper training, equipment, and procedures must be followed to ensure the safety of personnel and the integrity of the gas system.

It is important to note that gas air compressors should not be used directly for pressurizing or transporting natural gas or other combustible gases. Gas line maintenance tasks involving gas air compressors primarily focus on using compressed air for specific maintenance and testing purposes, as outlined above.

In summary, gas air compressors can be useful for certain aspects of gas line maintenance, including clearing debris, pressure testing, leak detection, valve and equipment maintenance, and pipe drying. However, it is crucial to follow safety guidelines and regulations when working with gas lines and compressed air to ensure the safety and integrity of the gas system.

air compressor

Are There Different Types of Gas Air Compressors Available?

Yes, there are different types of gas air compressors available, each designed to suit specific applications and requirements. These different types vary in terms of design, power source, configuration, and intended use. Here’s a detailed explanation of the various types of gas air compressors:

1. Reciprocating Gas Air Compressors:

Reciprocating gas air compressors, also known as piston compressors, use a reciprocating motion of one or more pistons to compress the air. These compressors are commonly used for small to medium-scale applications and are available in both single-stage and two-stage configurations. Single-stage compressors compress the air in a single stroke, while two-stage compressors use an additional cylinder for further compression, resulting in higher pressures.

2. Rotary Screw Gas Air Compressors:

Rotary screw gas air compressors utilize two interlocking helical screws to compress the air. These compressors are known for their continuous and efficient operation, making them suitable for demanding industrial applications. They are often used in industries such as manufacturing, construction, and automotive where a constant supply of compressed air is required.

3. Rotary Vane Gas Air Compressors:

Rotary vane gas air compressors use a rotor with sliding vanes to compress the air. As the rotor rotates, the vanes slide in and out, creating compression chambers that compress the air. These compressors are compact, reliable, and often used for smaller-scale applications or in situations where space is limited.

4. Centrifugal Gas Air Compressors:

Centrifugal gas air compressors operate by accelerating the air using a high-speed impeller. The accelerated air is then redirected into a diffuser, which converts the velocity energy into pressure energy. These compressors are commonly used for large-scale applications requiring high volumes of compressed air, such as in power plants, refineries, or chemical processing industries.

5. Oil-Free Gas Air Compressors:

Oil-free gas air compressors are designed to provide clean, oil-free compressed air. They feature special sealing mechanisms and materials to prevent oil contamination in the compressed air. These compressors are commonly used in industries where oil-free air is essential, such as food and beverage processing, pharmaceuticals, electronics manufacturing, and painting applications.

6. Portable Gas Air Compressors:

Portable gas air compressors are specifically designed for mobility and ease of transportation. These compressors often feature wheels, handles, or trailers for convenient movement. They are commonly used in construction sites, remote job locations, outdoor events, or other situations where compressed air is needed at different locations.

7. High-Pressure Gas Air Compressors:

High-pressure gas air compressors are designed to generate compressed air at elevated pressures. These compressors are used in applications that require air pressure higher than the standard range, such as in diving operations, breathing air systems, or specialized industrial processes.

8. Biogas Air Compressors:

Biogas air compressors are specifically designed to compress biogas, which is generated from the decomposition of organic matter. These compressors are used in biogas production facilities, landfills, wastewater treatment plants, or agricultural operations where biogas is produced and utilized as an energy source.

These are just a few examples of the different types of gas air compressors available. Each type has its own advantages and is suitable for specific applications based on factors such as required airflow, pressure, mobility, oil-free operation, and environmental considerations. It’s important to choose the appropriate type of gas air compressor based on the specific needs of the application to ensure optimal performance and efficiency.

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editor by CX 2024-04-23