Dallas Mining Services has all the gear to conduct mine-wide pressure quantity surveys at the clients request.
Surveys are now done using both barometric (indirect) and the hose drag (direct) method and we have 3 x Paroscientific Barometric Standards, 600 metres of tube, electronic manometers and sufficient anemometers, electronic and mercury hygrometers, etc to carry out the job.
A full or partial Pressure/Quantity survey may be warranted if the model is grossly out of date and inaccurate and it may be cheaper and faster to start again and determine new relevant mine resistances by such an approach.
Sometimes it may be required where emergency escape conditions are critical.
Under such a scenario specific flow directions and resultant contamination in roadways may be paramount to successful safe escape strategies and Ventsim may be of assistance here.