A low-pressure chiller's rupture disc has a discharge line running from it. Where does that line have to terminate?
Correct Answer
A) Outside the building, positioned away from openings and places where people are
If a relief device operates it will discharge a large part of the machine's charge in seconds. Sending that into the room would displace the air in it and endanger anyone inside, so the discharge line runs to the outdoors and terminates clear of doors, windows, air intakes and anywhere people gather. The line is kept full size and free of any valve or plug throughout, because anything that restricts it defeats the relief device it serves.
Why This Is the Correct Answer
The purpose of routing the relief discharge outdoors is to keep a sudden release of the entire charge away from the people in the machine room. The termination is placed clear of openings and occupied areas so that what comes out does not come straight back in, and the line stays unobstructed over its whole length.
Why the Other Options Are Wrong
Option B: In the machine room, at high level so the vapor disperses under the ceiling
Discharging inside the room puts the entire charge into the space people would be evacuating through, regardless of how high the outlet is.
Option C: Into the building's exhaust duct, so the vapor is diluted by the general exhaust
A general exhaust duct is not sized for a sudden release of an entire chiller charge, and it may serve other parts of the building.
Option D: Into a recovery cylinder mounted on the wall, so a relief event is captured
No cylinder could accept the flow from a relief event, and a closed vessel on the end of a relief line is itself a restriction.
Memory Technique
When the disc goes, the whole charge goes with it. Point it somewhere nobody is standing.
Reference Hint
Pressure relief discharge from a refrigeration machine is piped to the outdoors, away from building openings and occupied areas.
More epa-608-type-3 Questions
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A refrigerant vapor detector in a chiller machine room reaches its alarm level. Besides sounding, what is that alarm expected to do?
Which piece of equipment requires a technician to hold Type III certification before it may be serviced?
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