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
| Protection grade: | Explosion-proof |
| Operating temperature: | -10°C-55°C |
| Length | 0.5m |
