A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases?

Correct Answer: Option B — On the deck outside the pumproom

To prevent potential explosion from unverified flammable atmospheres inside a suspect pumproom, the combustible gas indicator must be operated from outside the space on the open deck, drawing samples via tubing.