FIELD: material handling facilities; pneumatic transportation.
SUBSTANCE: according to invention, tightness of pneumatic transportation plant is checked before starting and periodically in process of operation by creating vacuum gauge pressure of at least 0.08 MPa in pipeline and air line by vacuum pump, and residual pressure not higher than 0.02 MPa in unloader with subsequent revealing degree of air suction after closing of evacuation line. Reduction of vacuum gauge pressure in 10 min in pipeline should not exceed 0.005 MPa and in air line, not exceed 0.02 Mpa and rise of residual pressure in unloader should not exceed 0.0025 MPa in 5 min.
EFFECT: provision of reliable tightness of system and drying the system before starting and in process of operation.
3 cl, 1 tbl, 4 dwg
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