Tail plug of CCTV pipeline inspection robot for underground pipes defects

UV trenchless rehabilitation and CCTV inspection requirements on safety and security

Limited space refers to the space that is closed or partially isolated from the outside, with narrow entrances and exits, where operators cannot work inside for a long time, and where natural ventilation is poor, which is likely to cause the accumulation of toxic, harmful, flammable and explosive substances or insufficient oxygen content

1. Large enough for employees to enter and do the assigned work. 2. Access and evacuation are restricted and cannot be freely accessed. 3. Not designed to give employees long hours inside

Environment when the combustible gas concentration exceeds 10% of the minimum explosion limit when the combustible dust in the air is relatively concentrated so that the visual distance is blurred within 1.5m when the oxygen concentration is above 235%, the fire source uses electric tools, cutting and smoking.

Symptoms of the human body when the content of hydrogen sulfide (H2S) is below (PPM):

10ppm allowable concentration: 8 hours

50-100ppm slight eye and respiratory discomfort: 1 hour

200-300ppm obvious eye and respiratory discomfort: 1 hour

500-700ppm loss of consciousness or death: 30-60 minutes

> 1000ppm loss of consciousness or death: several minutes

Symptoms of the human body when the content of carbon monoxide (CO) is below (PPM):

50ppm allowable concentration 8 hours

200ppm mild headache, discomfort 3 hours

600ppm headache discomfort 2 hours

1000-2000ppm mild palpitation 30 minutes

1000-2000ppm unstable standing 1.5 hours

1000-2000ppm confusion, nausea, headache 2 hours

2000-5000ppm coma, loss of consciousness 30 minutes