Commercial Food Equipment Service Association (CFESA) Steam Practice Test

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A pressure gauge reads zero after a steam appliance is shut down. Why must the technician still use caution before opening the vessel?

A zero reading proves the gauge is accurate but the water may be cold The gauge may be isolated, blocked, or defective and trapped pressure may remain Steam pressure becomes electrical voltage after shutdown Atmospheric pressure always forces the vessel above its rated pressure

Correct Answer:

The gauge may be isolated, blocked, or defective and trapped pressure may remain

Explanation:

A pressure gauge can be inaccurate or isolated from the vessel by a blockage or valve. Safe service requires confirming that pressure is actually relieved rather than relying on a single indication.

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