I AM SELLING A USED KAESER SCREW COMPRESSOR. MODEL BDS 62. BOOKLET SPECIFIED WITH LAST MAINTENANCE PERFORMED IS COMPLETE. 

## Introduction

The **Kaeser BDS 62** screw compressor is an industrial machine used for the production of compressed air, essential in numerous industrial applications such as manufacturing, production, automotive, and many other sectors. Buying a used screw compressor like the Kaeser BDS 62 can offer numerous advantages in terms of costs and operational efficiency. In this guide, we'll explore how this type of compressor works, how to use it correctly, the different types of compressors available, their main applications, the alternatives on the market, and the reasons why it's worth buying a used model like the Kaeser BDS 62.

## 1. **How ​​a Kaeser BDS 62 Screw Compressor Works**

### Operating Principle

The **screw compressor** is a type of rotary positive displacement compressor that uses two intertwined screw rotors to compress air. In the case of the **Kaeser BDS 62**, it works as follows:

1. **Air Intake**: Ambient air is drawn through an intake filter that removes impurities and particles.
2. **Compression**: Air enters the compression chamber where two screw rotors (male and female) rotate in opposite directions. The movement of the rotors reduces the volume of the chamber, compressing the air inside.
3. **Cooling and Oil Separation**: During compression, oil is injected to lubricate, seal, and cool the rotors. The compressed air then passes through a separator that removes oil from the air.
4. **Post-Treatment**: The compressed air can be further cooled and filtered to remove residual moisture and particles, making it suitable for various applications.
5. **Discharge**: The clean, dry compressed air is then stored in a tank or distributed directly to the point of use.

### Features of the Kaeser BDS 62

- **Flow Capacity**: The BDS 62 model offers significant air flow, suitable for medium to large industrial applications.
- **Energy Efficiency**: Designed to operate with optimized energy consumption, reducing operating costs.
- **Reliability**: Kaeser compressors are known for their robust construction and long operating life.
- **Control System**: Equipped with a control panel that automatically monitors and adjusts operating parameters to ensure optimal performance.

## 2. **How ​​to Use**

### Installation

1. **Positioning**: The compressor must be installed on a flat, stable surface, in a well-ventilated area that is easily accessible for maintenance.
2. **Electrical Connections**: Connect the compressor to a suitable electrical supply, ensuring that the voltage and frequency are compatible with the machine's specifications.
3. **Air Connections**: Connect the compressed air outlet to the distribution system or storage tank.
4. **Checking Oil Levels**: Check that the oil level complies with the instructions in the operating manual.

### Operation

1. **Startup**: Turn on the compressor using the control panel. The system will perform a self-diagnosis before starting operation.
2. **Parameter Setting**: Configure the desired working pressure and other operating parameters according to the specific needs of the application.
3. **Monitoring**: During operation, constantly monitor parameters such as pressure, temperature, and oil level via the control panel display.
4. **Shutdown**: After operation is complete, shut down the compressor following the procedures in the manual to ensure a safe shutdown.

### Maintenance

- **Oil Change**: Change the oil at the specified maintenance intervals to ensure adequate lubrication.
- **Filter Cleaning**: Clean or replace the air and oil filters regularly to maintain operating efficiency.
- **Component Inspection**: Perform periodic inspections of rotors, seals, and other critical components to prevent unexpected failures.
- **Connection Check**: Periodically check all electrical and mechanical connections to ensure they are secure and free of leaks.

## 3. **Types of Screw Compressors**

### Based on Lubrication

- **Lubricated (Oil-Injected) Screw Compressors**: Use oil to lubricate and cool the rotors during compression. Suitable for most industrial applications.
- **Oil-Free Screw Compressors**: Do not use oil in the compression process, ensuring compressed air free of oil contamination. Ideal for sensitive applications such as the food, pharmaceutical, and electronics industries.

### Depending on the Cooling System

- **Air-Cooled**: Use ambient air to cool the system. They are simpler and require less maintenance.
- **Water-Cooled**: Use water for cooling, offering better thermal efficiency. Suitable for applications with high cooling requirements.

### Based on Speed ​​Control

- **Fixed Speed**: Operate at a constant speed, ideal for applications with stable compressed air demand.
- **Variable Speed ​​Drive (VSD)**: Automatically adjust motor speed based on compressed air demand, improving energy efficiency.

## 4. **Applications and Workable Materials**

**Screw compressors** such as the Kaeser BDS 62 are used to provide the compressed air needed in a wide range of industrial applications, including:

- **Manufacturing**: Powering pneumatic tools, assembly lines, painting and sandblasting systems.
- **Food and Beverage**: Packaging, bottling, and process control operations.
- **Pharmaceuticals**: Manufacturing processes, environmental control, and instrumentation.
- **Chemical and Petrochemicals**: Materials transportation, process control, and equipment powering.
- **Construction**: Powering jackhammers, drills, and other construction equipment.
- **Automotive**: Painting, assembly, and quality control.

## 5. **Alternative Machinery**

### Reciprocating Compressors

- **Piston Compressors**: These use pistons to compress air. They are best suited for applications requiring low amounts of compressed air and have lower initial costs, but are less efficient and noisier than screw compressors.
  
### Scroll Compressors

- **Scroll Compressors**: These use two scrolls to compress the air. They are quiet and compact, ideal for applications requiring clean, low-volume compressed air.

### Centrifugal Compressors

- **Dynamic (Centrifugal) Compressors**: They use a high-speed rotating impeller to accelerate and compress air. Suitable for applications requiring large volumes of compressed air at moderate pressures.

## 6. **Why It's Worth Buying a Used Kaeser BDS 62 Screw Compressor**

### Economic Benefits

- **Lower Cost**: Buying a used compressor significantly reduces the initial investment compared to buying a new machine.
- **Reduced Depreciation**: A used machine has already suffered most of its depreciation, retaining its value better over time.

### Reliability and Quality

- **Kaeser Build Quality**: Kaeser is renowned for producing high-quality and reliable compressors. A used model like the BDS 62 can still deliver excellent performance if properly maintained.
- **Durability**: Screw compressors are designed to last. A used model, with regular maintenance, can operate effectively for many years.

### Immediate Availability

- **Reduced Delivery Times**: A used compressor is generally available immediately, avoiding the waiting times associated with ordering and manufacturing a new machine.

### Environmental Sustainability

- **Reducing Environmental Impact**: Reusing used machinery helps reduce industrial waste and the environmental impact associated with the production of new machinery.

### Tested and Verified

- **Proven Performance**: A used compressor has already demonstrated its operational reliability. Furthermore, any manufacturing defects have likely already been identified and corrected.

### Support and Maintenance

- **Spare Parts Availability**: Kaeser provides excellent after-sales support and easy availability of spare parts, making it easy to maintain and repair used models like the BDS 62.
- **Wide-Range Technical Knowledge**: Being a widespread model, it is easier to find qualified technicians and detailed information for the maintenance and correct use of the machine.

## Conclusion

Purchasing a used Kaeser BDS 62 screw compressor is a smart choice for companies seeking to optimize costs without compromising quality and operational efficiency. Thanks to its reliability, energy efficiency, and versatility, this machine can meet a wide range of industrial needs. It's essential, however, to ensure the used compressor has been well-maintained and to inspect its operating conditions before purchase, ideally with the assistance of a qualified technician. With proper care, a used compressor like the Kaeser BDS 62 can offer excellent value for money and significantly contribute to business productivity.