What safety measures should be taken for electric welding and hot work in the plant’s utility tunnels?

Safety measures are as follows: 1. Conduct explosion testing and analysis; work can only begin after the analysis shows satisfactory results； 2. Safety measures must be implemented ； 3. Place the slag collection basin in position ； 4. The guardian is present. Control welding: 1. Prepare an appropriate welding plan ； 2. Use a lower welding current ； 3. Ensure good welding quality

The last edit to this post was made by ylb913 on 2016-10-11 at 20:29. Building on the reply from the second floor: Regarding the utility tunnels along the roads, after the accident last year in which a person was killed by a QD manhole cover, our fire safety classification was changed from level two to level one. Roadside areas often have a high number of sewer covers, as there are likely many users who discharge waste there; controlling this situation is quite difficult, which is why it’s important to seal off the sewers. Unlike in the workshop, as long as you don’t arrange it yourself, you’ll be quite familiar with the situation there; although sealing is still necessary. Another issue is the possible occupation of public spaces. There is also the issue of which entity is responsible for issuing the permits. For the construction of new pipelines, the road’s center line serves as the boundary, and the party that is closer to this line is responsible for its management; as for old pipelines, they fall under the responsibility of the oil products or power departments. Also, due to the location of the temporary power distribution panel, it may be necessary to obtain approval from nearby units.

Safety measures are as follows: 1. Conduct explosion testing and analysis; work can only begin after the analysis shows satisfactory results； 2. Safety measures must be implemented ； 3. Place the slag collection basin in position ； 4. The guardian is present. Control welding: 1. Prepare an appropriate welding plan ； 2. Use a lower welding current ； 3. Ensure good welding quality

The media in utility tunnels are complex, often involving multiple governing entities, and working on such tunnels involves working at heights, which makes it highly dangerous. It is necessary to strictly follow the Ten Prohibitions for Working with Open Flames and the Ten Prohibitions for Working at Heights. Use spark arrestors and fire-resistant fabrics to prevent spark scattering; pay special attention to covering the manholes and ditches around the pipe gallery. Supervisors must fulfill their duties, with supervisors assigned both above and below the pipe gallery.

The analysis on the 2nd and 3rd floors is very thorough; I’d like to add the following: 1. When analyzing risk factors, consider falls from heights (of people or objects), as well as ensuring that the chin strap of safety helmets is fastened properly. 2. The welding ground wire should be connected to the same support as the weld point, within a range of no more than 1 meter. 3. Use ropes for material transportation; throwing or passing it is not allowed. 4. Do not rely on a high-positioned seat belt; use a safety rope instead. 5. Hazard sources are isolated using flame-retardant materials.

The differences lie in implementing proper measures to prevent spark scattering, paying attention to venting pipelines and installing blind flanges, obtaining the necessary work permits before starting operations, as well as handling tasks such as working at heights and installing or removing blind flanges

I once encountered the same problem and never found a good solution; Haiyou offers some advice: one is gas analysis. The hot work site is at a high position in the pipe gallery, and it is impossible for the analyst to go up there to take samples ； During the construction of pipe galleries, welding operations move from one location to another; the linear distance involved is large, which makes sampling and analysis unsuitable for representing the actual conditions ； There are many types of materials involved, and their toxicity is unknown; essentially no analysis has been conducted on toxic or asphyxiating gases, and it is impossible to ensure that sampling and analysis can be carried out in such cases. The second is emergency evacuation. In ductwork operations, climbing ladders are only installed at the columns of the ductwork. Sometimes, as the work location changes, workers end up far away from these ladders; in the event of a fire, it becomes impossible for them to escape. This is especially true when workers are located between several layers of duct supports, as it becomes quite difficult for them to move around.

The addition is good; don’t start cooking when the wind is strong.

When performing hot work in utility tunnels, it is necessary to take into account the large number of substances involved, as well as the numerous testing points and risk analysis factors related to potential hazards. Before carrying out any hot work, it is necessary to conduct a risk assessment of the pipe gallery and the surrounding area. In accordance with Jiangsu’s regulations on work safety, a construction plan must be prepared, a risk assessment carried out, and emergency measures established in response to the identified risks. Safety measures generally include: 1. Checking whether the gas levels are within acceptable limits, and whether blind flanges have been used for sealing. 2. If personnel are involved in work at heights, the appropriate personal protective equipment must be available. 3. It is necessary to ensure that areas surrounding the work site are free from fire hazards caused by sparks; these areas should be cleaned regularly or protected accordingly. 4. There must be a dedicated supervisor, as the nature of this work means that the workers cannot have a complete understanding of the situation at the site.

Differences: 1. When working at heights, welding slag falls to the ground, gutters, etc., over a large area; if the wind is strong and the slag flies around, welding is not permitted. Flammable materials on the ground should be cleared away.