Equipment Maintenance & Safety Flashcards

Which component in a cremation retort control system acts as the primary safety device to cut off fuel supply if a flame is not detected?

Answer: Flame safeguard relay (flame monitor)

The flame safeguard relay monitors the burner flame signal and automatically cuts off fuel if no flame is detected within the trial-for-ignition period.

When should a retort operator purge the gas manifold of air before attempting ignition after a maintenance shutdown?

Answer: Before every ignition attempt following any service that opened the gas line

After any maintenance that opens the gas supply line, air enters the manifold and must be purged safely before ignition to prevent a potentially explosive air-gas mixture.

In crematory operations, 'negative draft' in the retort refers to:

Answer: Lower pressure inside the retort than outside, drawing air in and pulling flue gases up the stack

Negative draft (negative pressure differential) inside the retort relative to the surrounding environment draws combustion air in and directs flue gases up and out through the stack.

Which of the following best describes the correct procedure when a retort door seal (gasket) shows signs of wear or deterioration?

Answer: Replace the gasket immediately to prevent heat loss and flue gas leakage

A deteriorated door gasket allows heat loss and flue gas escape into the workspace; immediate replacement restores a safe, efficient seal.

A crematory's stack emissions test reveals opacity levels exceeding the permitted limit. Which maintenance action is MOST directly likely to correct this?

Answer: Cleaning carbon deposits from the secondary chamber and verifying afterburner temperature and residence time

Excessive opacity typically results from incomplete secondary combustion; cleaning the afterburner and confirming temperature and residence time compliance directly addresses the cause.

What is the recommended approach for disposing of used refractory material removed during retort relining?

Answer: Consult local regulations; refractory may contain trace cremation residues and must be disposed of appropriately

Used refractory from a cremation chamber may contain trace human remains and must be disposed of according to applicable local, state, and federal regulations.

Which of the following is a key indicator that the draft inducer (exhaust fan) on a retort is malfunctioning?

Answer: Positive pressure in the primary chamber causing smoke or gases to push out when the door is opened

A failing draft inducer reduces exhaust pull, causing positive pressure in the chamber so gases and smoke escape outward when the door is opened instead of being drawn up the stack.