When we have doubts about the safety of the gas in the confined space, we need to use 4 gas detector confined space for gas testing. During the welding process, there is a potential risk of an explosion caused by flammable gases due to leakage of gas pipes or adapters, and the high-temperature process may cause the evaporation of harmful substances in the space and the generation of harmful gases. Workers go into confined Spaces must take a gas detector for continuous monitoring gas concentration to ensure that they can leave in time in case the gas in the working environment reaches dangerous values.
Limited space refers to a closed or partially closed space with narrow and limited inlet and outlet, not designed as a fixed workplace, poor natural ventilation, and easy to cause toxic and harmful, flammable and explosive substances accumulation or insufficient oxygen content. Limited space operation refers to the operation activities carried out by operators entering a limited space. Usually the most conventional and the most common four gases in the limited space are: hydrogen sulfide, carbon monoxide, combustible gas, oxygen, and oxygen must be detected, because many sealed Spaces are not ventilated, there will be hypoxia phenomenon, so we must first use the detection instrument to detect whether there is hypoxia, to ensure that the operator will not coma due to hypoxia.
There are three categories of finite space:
1.The first type: airtight equipment such as cabins, storage tanks, vehicle tank, reactor, pressure vessel, pipeline, flue, boiler and so on.
2.The second category: underground limited space such as underground pipes, basements, underground warehouses, underground engineering, waste Wells, cellars, sewage tanks, ponds, septic tanks, sewers, etc.
3.The third category: Enclosed spaces are areas with limited entry and exit points, such as tanks, cargo holds, cold storage rooms, fermentation tanks, garbage stations, granaries, and other compartments etc.
The operation method of the gas detector in a confined space is as follows:
1. The admission of oxygen, detect the oxygen concentration level at that time.
2, Flammable gas admission, detection of flammable gas changes.
3. Admission of toxic gases, testing whether the concentration of each toxic gas is lower than the allowable exposure PEL under OSHA rules. In a confined space, the general toxic gases are H2S, CO, and other toxic compounds are not among them.
Pump sampling at the top, middle, and bottom of a confined space is important to measure the concentration of different gases or vapors. Some gases are lighter than air (like methane and flammable gases) and should be tested in the top of the confined space, while some gases are heavier than air (like H2S) and can be monitored at the bottom of the confined space. There are other gases that are almost as heavy as air (like CO) that can be measured in the middle of a confined space.