Mine Ventilation & Atmospheric Monitoring Flashcards

Atkinson's equation (H = R × Q²) relates which three ventilation parameters?

Answer: Pressure loss, airway resistance, and airflow quantity

Atkinson's equation states that pressure loss (H) equals resistance (R) multiplied by the square of the airflow quantity (Q²), and is the fundamental equation used to design and analyze mine ventilation networks.

What is 'white damp' (also called 'carbon monoxide') and why is it particularly dangerous in mines?

Answer: Odorless, colorless carbon monoxide that impairs oxygen transport in the blood with little warning

White damp (CO) is colorless and odorless, and at low concentrations causes symptoms that can be mistaken for fatigue; it binds to hemoglobin with much greater affinity than oxygen, causing rapid incapacitation.

According to MSHA regulations, what must happen to ventilation systems in an underground coal mine before blasting operations?

Answer: The area must be pre-shift examined and air quantities confirmed adequate before and after blasting

Pre-shift and on-shift examinations of ventilation conditions are required before blasting, and ventilation must be sufficient to clear blasting fumes (including CO and NO2) from the working area before miners reenter.

In mine ventilation design, when airways are connected in SERIES, what is the effect on total resistance?

Answer: Total resistance is the sum of individual airway resistances

When airways are in series, air must travel through each one sequentially, so resistances add directly; this is analogous to resistors in series in an electrical circuit.

What is the primary purpose of a 'line brattice' in underground mine ventilation?

Answer: To direct auxiliary ventilation air to the working face in a dead-end heading

A line brattice is a curtain of brattice cloth installed along the rib of an entry to create a duct that forces fresh air to the working face while return air travels back on the other side.

Which monitoring device provides continuous real-time detection and alarm for methane concentrations at mining equipment in underground coal mines?

Answer: Methane monitor (methanometer) with automatic power cut-off

MSHA-required methane monitors are installed on continuous miners and other equipment to provide real-time readings and automatically cut power when methane reaches 1.0-2.0% thresholds, preventing ignition.

What is 'stinkdamp' (hydrogen sulfide, H2S) and what is the hazardous property that makes detection unreliable at high concentrations?

Answer: Olfactory fatigue causes the sense of smell to stop detecting it at dangerous concentrations

H2S is detectable by its rotten-egg odor at very low concentrations, but olfactory fatigue (paralysis of the sense of smell) occurs rapidly at higher levels, causing miners to believe the gas is gone when it is actually dangerously high.