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Closed-circuit SCBAs
5. Read the text and fill in the gaps with the following words: underwater, gas, worn, operations, fullface, breathing, developed, rebreathers. The closed-circuit type filters, supplements, and recirculates exhaled …. It is used when a longer-duration supply of … gas is needed, such as in mine rescue and in long tunnels, and going through passages too narrow for a big open-circuit air cylinder. Before open-circuit SCBAs were …, most industrial breathing sets were …. Rebreathers used … have the advantage of not releasing bubbles, making it more difficult to detect divers involved in covert …. An open-circuit rescue or firefighter SCBA has a … mask, regulator, air cylinder, cylinder pressure gauge, and a harness with adjustable shoulder straps and waist belt which lets it be … on the back. 6. Find the following information in the text: 1. The names of two types of a breathing apparatus. 2. The name of a breathing set used in the past. 3. The advantage of a rebreather used underwater. 4. The main components of a SCBA. 5. The functions of a closed –circuit type filter. 7. True or false: 1. The open-circuit air cylinders are used to recirculate exhaled air. 2. A longer-duration supply of breathing air is needed in mine rescue. 3. Rebreathers used underwater release bubbles. 4. A firefighter SCBA doesn’t have a mask. 5. Open-circuit SCBAs are more useful for firefighting purposes. 8. Label different components of a breathing apparatus in the picture: a mask, a regulator, an air cylinder, a cylinder pressure gauge, adjustable shoulder straps.
9. Complete the description of a breathing apparatus supplying the necessary information: It is a ….type of …… It was developed by….in…. It was first used in… It is designed for the purpose of…. It is made of…… It consists of……. Its main advantage is… It is used mainly by….in the situation of…..
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