Question 187Steam Plants - 1st Asst/Chief

The correct answer is D) The steam pressure will rise. When the sensing line for the idle boiler is accidentally opened, it causes the automatic combustion control system to detect a drop in steam pressure from the idle boiler. In response, the system will increase the fuel supply to the active boiler, causing its steam pressure to rise. This is to compensate for the loss of steam pressure from the idle boiler, maintaining the overall steam pressure in the system. The other options are incorrect because the water level in the active boiler will not be affected, and the steam pressure will increase, not decrease, due to the automatic adjustments made by the combustion control system.