Swarna saw a labour entering into the sewage manhole immediately after removing the lid.
She promptly stopped the labour from entering into the manhole and told him to wait for some
time before he enters into it.
(a) What will happen if the labour immediately enters into the manhole for cleaning after
removing the lid?
(b) Name main gases that are released from the manhole.
(c) What value of Swarna is seen in the above act?
Answers
Answer: PLEASE PLEASE PLEASE MARK MI AS BRAINLEIST!!
Working near or in a manhole inherits potential dangers which may result in serious accidents. The common ones include falls/slips, fire or explosion, oxygen depletion, gas poisoning, heat stress, drowning, asphyxiation arising from gas, fume, vapour and entrapment by free flowing solid.
Asphyxia occurred when the foreman did not get enough oxygen to sustain life, either because the amount of oxygen in the atmosphere was too low (i.e., oxygen deficiency) and/or a hazardous chemical concentration was too high (e.g., high carbon dioxide level). Although the exact atmospheric conditions in the manhole at the time of the incident are unknown, measurements taken after the incident indicated it was possible the oxygen levels were low enough and/or carbon dioxide levels were high enough to cause asphyxiation.
When rescuers arrived the atmosphere contained 19.1% oxygen, however this measurement was taken after construction workers had used a fan to provide fresh air to the disoriented worker. One day after the incident, the atmosphere contained 16.5% oxygen and four days after the incident the oxygen concentration dropped to 7.7%. Hazardous atmospheres in manholes is very deadly.