PPS - underground structure (shelter) for storage of reserve self-rescuers and protection of underground personnel, is an autonomous technical device, provides accessibility to underground personnel during evacuation from emergency areas of mines to self-rescuers with unused resource of action. PPPs are classified according to the following characteristics: - By the method of placement in mine workings (mobile or stationary); - By the nature of movement in mine workings (mobile and non-mobile); - By fresh air supply system (autonomous and combined - mine pneumatic pipeline and cylinders); - By structural design (modular and containerised); - By lighting design (battery or combined lamps); - By autonomous operation time (but not less than 90 minutes); - By throughput capacity; - By airlocking (with vestibule-locker, pass-through, combined); - By door locking method (lever, toothed, combined).
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