Patent ID: 9416605
Filing Date: 2016-08-16
CPC Classification: E21B

Claim Text:
1. Method for determining a variation of a flushing medium flow at a rock drilling apparatus, where a compressor ( 8 ; 301 ) discharges a flow of pressurized gas, where said gas flow at least partially is used as flushing medium during drilling with a tool ( 3 ), wherein, during drilling, said flushing medium is led to said tool ( 3 ) for flushing away drilling remnants, the method including the steps of: determining a rate of pressure variation representing a difference between a flow discharged by the compressor for use as flushing medium and an actual flow of said flushing medium at the tool, and generating a signal of decreased flow of flushing medium at the tool when said determined rate exceeds a first value.