Question

1. a pressuretrol on a steam boiler:

is typically set at 15 to 25 psi
is both an operating device and a safety device
is located at the bottom of the boiler
should never have a pigtail
turns the boiler on when the steam pressure drops below 10 psi

1. pressure relief valves on

Explanation:

To determine the correct answer, we analyze each option:

• Option 1: Pressuretrol settings vary, and 15 - 25 psi is not a universal typical setting.
• Option 2: A pressuretrol controls the boiler's operation (turns it on/off based on pressure) and also acts as a safety device by preventing overpressure, so this is correct.
• Option 3: Pressuretrols are not typically located at the bottom of the boiler.
• Option 4: Pressuretrols often use a pigtail (a small pipe) for pressure sensing.
• Option 5: The pressure at which it turns the boiler on depends on the system's setting and is not universally 10 psi.

Answer:

B. Is both an operating device and a safety device