APPLICATION OF COMPRESSING AND VENTILATING FACILITIES IN HIGHER SEA LEVEL MINES-Another especial problem in exploitation of higher sea-level deposit

In higher sea-level mines,due to the variable conditions of atmosphere, there are many especial problems in exploitation and cons truction of deposit, which remain to be solved reasonably. This paper comprehensively describes how to calculate and select the proper capacity and power consumption of compressors and the performance data of ventilators, according to the height above sea-level.