The back-up self-rescuer switching point (PPRS) is designed to eliminate harmful factors of the mine environment when mine employees switch to back-up self-rescuers in emergency situations. It can be used as a shelter or recreational area for rescuers during emergency operating procedures.
The PPRS is designed for application in remote working zones of coal mining companies when the exit time to a safe place during emergency situations cannot be guaranteed by the time of the protective mine rescuer.
It can also be used in other industries where there is a risk of emergency situations with formation of an atmosphere not suitable for breathing.
The back-up self-rescuer switching point is a metal structure consisting of three modules — two end and one intermediate. The number of intermediate modules is determined based on the number of the most numerous shift working at the potentially hazardous site. The modules are tightly connected to one another, the end modules have tightly closing doors. The end modules serve both for switching to the back-up self-rescuer and for the entrance (entrance module) and exit (exit module).
Each module has cells for back-up (spare) self-rescuers, a container for used self-rescuers, and a source of fresh air (a 40 l cylinder). In the modules, there are airflow chambers at the head level open on the front side, each connected to a source of fresh air through a foot-driven tap (pedal).
The back-up self-rescuer switching point contains a 1-litre compressed air tank for artificial lung ventilation in case mine rescuers have to provide breathing assistance to an injured person.
Limit switches are mounted on the entrance and exit doors connected with the mine dispatcher’s console in case of unauthorized opening of the doors. A 5-litre fire-extinguisher is also supplied.
The back-up self-rescuer switching point has a wall bracket to mount a phone for communication with the mine dispatcher and explosion-proof cable glands.
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