One boiler of a two boiler plant has ruptured a tube and the water cannot be maintained in sight in the gage glass. After securing the fires, your next action should be to __________.

Correct Answer: Option A — secure the feed water supply to the boiler

After securing the fires during a severe tube failure, shutting the feed water supply prevents flooding the furnace with escaping water and conserves plant water inventory to maintain proper levels in remaining operational boilers.