How long can air respirator supply?

When an air respirator is purchased, it is often asked how long it can be used by the operator for breathing. The most common air breathing apparatus cylinder on the market is 6.8 liters, because the larger the cylinder capacity is, the heavier it is, and it is easy to cause fatigue after carrying the rescue or normal work, and the work efficiency is low. The theoretical use time of the 6.8-liter air respirators is 68 minutes, but the difference in lung capacity, work intensity, personal constitution and psychological quality of the users will directly affect the time of use, but it will not be possible to use at least 45 minutes.
1. Physical Fitness:
Before the test, first test the player's lung capacity, record, and then compare with the air breathing apparatus test results, found that the use of air respirator with a small amount of vital capacity of the air respirator is longer, and the time of use of the air respirator with large vital capacity is short.
A comparison of players with similar endurances found that the players with smaller capacity had overall smaller and slimmer bodies, which means that when the endurance is similar, the use of air respirators with relatively small size is relatively long; A comparison between players of the same height and weight found that the players with larger vital capacity showed good physical fitness such as running and jumping, but no air breathing apparatus was found to have good physical fitness during the test. It is obviously short.
The above results show that when the physical condition is similar, the air respirator of a relatively small amount of lung capacity and a small body size will be used for a longer period of time; under the premise that the vital capacity of a player cannot be grasped, the player with a good physical condition is given priority.

2. Psychological quality:
Studies by psychologists have shown that in the face of dangerous situations, normal people will show nervousness, anxiety and panic, and they will experience faster heart rate and faster respiratory rate. At this time, the amount of oxygen consumed in the blood circulation is much higher than the oxygen consumed in normal circumstances even if the person controls the breathing frequency or does not breathe.
However, people with relatively good psychological qualities or those who have undergone psychological training will choose calm after panic, and their heartbeat and breathing will gradually return to normal.
Therefore, personnel with relatively good psychological quality use air breathing apparatus for a relatively long time.

Based on the above experiments, it can be concluded that when the physical conditions are similar, the lung capacity is relatively small, the body size is small, and the air breathing apparatus with good psychological quality is used longer.

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