Question 203Steam Plants - 1st Asst/Chief

The correct answer is B) introduce a control for maintaining constant steam pressure regardless of boiler load. In a pneumatic automatic combustion control system, the standardizing relay is responsible for maintaining a constant steam pressure regardless of the boiler load. It does this by adjusting the air supply to the burner to match the steam demand, ensuring that the steam pressure remains stable even as the load on the boiler changes. The other options are incorrect because they do not accurately describe the function of the standardizing relay in this type of system. Option A relates to maintaining constant superheated steam temperature, option C describes a backup for manual control, and option D is about controlling the boiler drum water level, none of which are the primary function of the standardizing relay.