METHOD AND DEVICE FOR MAINTAINING BREATHABLE AIR

摘要

A device and method for maintaining breathable air in a refuge chamber is disclosed. The device comprises a gauge to monitor differential pressure between inside the refuge chamber and outside the refuge chamber; a detector to detect one 5 or more hazardous or harmful substance inside the refuge chamber; a compressed air storage bank to maintain the differential pressure at a desired positive differential level and to reduce the level of at least one of a respective one or more detected hazardous or harmful substance below a set level by varying an amount of stored compressed air released into the refuge chamber. PPU CONTROL PANEL C -] POLYWhON cc REFUGECHAMBE 01r 7 1us BALL VALVyE FLOW CONTROL VALVE FLOW METER { CHECK VALVE PRSUEREGULATOR HIGH PRESSURE SILENCER ----- MEDIUM PRESSURE PRESURE AUGELOW P RESSURE SAFETY VALVE [W NEEDLE VALVE jDRAEGER SAFETY PACIFIC DIFFERENTIAL PRESSURE SWITCH * PPU 5000 AT~MOOR1AISH 22/10/12 PNEUMATIC DIAGRAM DIFFERENTIAL PRESUREGAUGE PPU-3502409-PD A2 SILECER EDIU PRES *"