Which type of gas mask to wear in a confined space

Frequently asked on the Internet to receive some customer comments on the similar issues of what kind of gas masks are used in confined spaces. The confined space referred to here is not a completely closed operating environment, but it is isolated from the outside world and imported airborne is restricted. , Poor ventilation, such as tank trucks, fireplaces, sewers, waste septic tanks or cellars and other places.

Confined space is generally limited to space for operators, and the oxygen content in the air is low, especially in the cellar or sewers, waste septic tanks, etc., there will be some toxic and harmful gases inside, once the rush has entered will give people breathing system or skin Bring hazards. So, what kind of gas masks should we wear in this special environment? Are all gas masks suitable for use in confined spaces?

General gas masks can be roughly divided into self-absorption filter gas masks and isolated gas masks. The biggest difference between the two types of gas masks is that the former (self-absorption filter gas mask) uses the human body's own respiratory pressure and will be toxic to the outside world. After the substance is filtered through the gas mask filter cartridge, it can breathe clean oxygen, but the precondition must be that the oxygen content in the working environment is sufficient, and the poison cartridge worn by the gas mask can effectively protect the toxic substances in the environment; while the latter (insulated Gas mask), the protective performance is far greater than the former, it is generally self-provided gas source, the use of the pressure of the gas supply directly to the user to breathe, so the use of external oxygen content is not sufficient, toxic substances, these two factors influences. Therefore, for similar confined spaces, it is best to use isolated gas masks, which greatly increases the safety factor.

It is suggested that isolated gas masks should be used in confined spaces. However, some people will ask if they are more economical. Indeed, there are many types of isolated gas masks, such as self-priming long-pipe respirator, electric-ventilated long-pipe respirator, and air respirator. The performance of these three types of gas masks is also very different, of course, the price of gas masks also varies greatly. From the type of product alone, the price of air respirators is relatively expensive, followed by the electric ventilation stadium. The cheapest self-priming long tube respirator.

Here we will not discuss where the difference in price is. Let's first understand the relationship and the principle of the three. Self-priming long-pipe respirator and electric air-supply long-pipe respirator are related types. There is a long pipe connecting the gas source and the gas mask worn by the operator. The difference is that the self-priming long-pipe respirator is required to be used. The person who breathes on his own, if the air source is far away from the operating position, it will be more laborious to breathe; the electric air supply long tube respirators use a motor to send a clean air source to the respiratory gas mask. Air respirator is relatively convenient for long tube respirator. Air supply source is directly compressed and stored in the gas bottle. It is convenient for the user to carry it, but the capacity in the gas bottle is limited. Therefore, the operating environment must be replaced before the gas source is used up. Gas cylinders.

Therefore, which of the insulating gas masks is used in a confined space must be defined in conjunction with the use of the site. If the space is only for one person and is relatively close to a clean air source, such as a sewer or tanker, Xiaobian recommends the use of a long-pipe respirator. However, the space is large and the working time is not sufficient. You can choose air respirator operation.

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