Precautions for oxygen and explosion detection personnel during maintenance

First of all, take good care of your own protection

This was inspected by our safety officer. A handheld hazardous gas detector will suffice.

This post was last edited by sxqssong on 2017-6-18 at 13:55. Generally, the laboratory staff are not responsible for this task; they have little knowledge of the site, which instead increases safety risks. It is the operators in charge of supervision who carry out this work, using combustible gas detectors and oxygen meters.

We were also inspected by safety officers. A handheld hazardous gas detector will suffice.

The laboratory technician takes samples, conducts tests, and signs off when processing the work order. At the work site, supervisors carry portable detectors to monitor continuously.

Yes, it seems that in your area the quality management systems are well-developed, with distinct roles such as specialized sample collectors and inspectors.

This post was last edited by byj on 2017-6-20 at 15:33. First, the laboratory technician must wear the appropriate protective equipment depending on the work area, pay attention to the surrounding environment and wind direction, and be familiar with the knowledge related to sampling in areas where welding is carried out. 1. When taking samples, do not face the sampling port or reach your body into the container to avoid being poisoned by the toxic gases inside; sampling should be carried out with the presence of personnel on site. 2. Sampling for analysis should be representative and comprehensive. When the confined space is large, samples should be taken from the upper, middle, and lower sections for analysis; it is necessary to ensure that the concentration of combustible gases and the oxygen level in all areas of the confined space are within acceptable limits (when the lower explosion limit of the combustible gas or vapor in question is less than 4%, its concentration should be less than 0.2% on a volume percentage basis) ； When the lower explosion limit of the combustible gas or vapor being tested is equal to or greater than 4%, its concentration should be less than 0.5% (by volume) ； When the lower explosion limit of the combustible gas or vapor being tested is equal to or greater than 10%, its concentration should be less than 1% ； The oxygen content should be between 18% and 23.5% to be considered acceptable.) ； 3. The levels of toxic and harmful substances do not exceed the **specified limits for the maximum allowable concentrations of toxic substances in workshop air**. The temperature in confined spaces should be around normal room temperature; it is necessary to monitor it regularly during operations, taking samples for rechecking every 2 hours (the samples must be retained for at least four hours after the analysis results are obtained). If any one test result is unsatisfactory, operations must be stopped immediately. Sampling is required to be done 30 minutes before entering the equipment; if more than 30 minutes have passed, sampling must be repeated. 4. In confined spaces, it is necessary to test for combustible gases, toxic gases, and oxygen levels; sampling from sewers or underground areas also requires testing for hydrogen sulfide levels.

Yes, dedicated personnel for sampling and dedicated personnel for analysis