Siebe Gorman CDBA

Siebe Gorman CDBA (Closed Circuit Breathing Apparatus) is a type of rebreather developed by the British company Siebe Gorman. It was primarily used by military and commercial divers due to its ability to allow divers to stay underwater for extended periods without producing bubbles, which could reveal their location.

History

The Siebe Gorman CDBA was developed in the mid-20th century, during a period of significant advancements in underwater diving technology. The company, founded by Augustus Siebe and his son-in-law, William Gorman, had a long history of producing diving equipment, including the pioneering standard diving dress.

Design and Function

The CDBA is a type of rebreather, which recycles exhaled air by removing carbon dioxide and adding oxygen, allowing the diver to breathe the same air multiple times. This is in contrast to open circuit diving systems, which release exhaled air into the water.

The CDBA uses a chemical, soda lime, to remove carbon dioxide from the exhaled air. The oxygen is supplied from a cylinder and the amount is controlled by the diver using a manual valve. The system is fully mechanical and does not require any electrical power.

Usage

The main advantage of the CDBA is its ability to allow divers to stay underwater for extended periods without producing bubbles. This makes it ideal for military operations, where stealth is often required. It was also used by commercial divers for tasks such as underwater welding, where bubbles could interfere with the work.

Legacy

The Siebe Gorman CDBA played a significant role in the development of modern diving technology. It was one of the first rebreathers to be widely used, and its design principles are still used in many modern rebreathers.