What Are The 2 Main Types of SCBA?
There are two main types of SCBA (Self-Contained Breathing Apparatus) commonly used among respiratory devices, and the choice of which type to use depends on the characteristics of the working environment and the level of danger. You can find a summary of the main differences between these two types of SCBA in this content.
There are two primary types of SCBA (Self-Contained Breathing Apparatus) used today: Open-Circuit SCBA and Closed-Circuit SCBA. The main difference between the two is their preference based on the duration of rescue operations.
SCBA (Self-Contained Breathing Apparatus) is a type of respiratory device commonly used by firefighters, chemical plant workers, and individuals working in hazardous environments. There are two main types of SCBA:
Pressurized Air SCBAs: These SCBAs use an air cylinder to provide clean air for breathing. The cylinder is typically filled with high-pressure air and is breathed through a mask or facepiece worn by the user. Pressurized air SCBAs can be suitable for extended use and may provide the user with more freedom of movement. However, the air cylinder has a limited capacity, and it may need to be refilled or replaced after a certain period.
Chemical Cartridge SCBAs: SCBAs with chemical cartridges are designed to clean the outside air and filter out harmful gases and chemicals. These SCBAs come with a facepiece or mask that contains a filter, and the user breathes through this device. SCBAs with chemical cartridges are more suitable for quick movement and short-duration use, and they do not require additional maintenance like air cylinder refilling. However, the capacity and effectiveness of the filter are limited, so the usage time is restricted.
Both types of SCBA are chosen and used based on specific working conditions and danger levels. The choice of which type to use depends on the characteristics of the working environment and the level of danger.
Differences Between SCBA Types:
The following table compares the features of both SCBA types, helping you evaluate which type is more suitable for a particular application or working condition:
| Features | Pressure Demand SCBAs | Chemical Cartridge SCBAs |
|---|---|---|
| Air Source | External high-pressure air cylinder | Chemical filter |
| Mobility | Offers more freedom of movement as the air cylinder is carried on the back | Limited head and neck movement due to full-face mask or facepiece |
| Duration of Use | Depends on the capacity of the air cylinder | Depends on the capacity and effectiveness of the filter |
| Maintenance Requirements | Requires regular maintenance and may need cylinder refilling | Requires periodic filter replacement |
| Cost | Associated with cylinder refilling and maintenance | No additional cost for air cylinders, filter replacement cost may apply |
| Suitable Applications | Suitable for a wide range of applications, especially for longer-duration tasks | Suitable for short-duration tasks and confined spaces |
| Dependency on External Air Source | Yes | No |
| Portability | Bulkier and heavier | More lightweight and compact |