Arizona Driving Permit Written Practice Exam

If a boiler safety valve is set to open at 1000 kPa, what is its primary function?

To control the boiler operating pressure To prevent boiler pressure from exceeding the MAWP To regulate steam flow to the turbine To blow down the boiler drum

Correct Answer:

To prevent boiler pressure from exceeding the MAWP

Explanation:

Safety valves are the ultimate safety device to prevent pressure from exceeding the Maximum Allowable Working Pressure (MAWP).

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