🔍 Key Concepts

• Operation of low-pressure refrigerant systems on ships • Function and purpose of a purge unit in a refrigeration system • Typical leak paths in refrigeration systems (shaft seals, rupture disks, water-side leaks)

💭 Think About

• Which component is specifically designed to remove non‑condensable gases and may discharge small amounts of refrigerant as part of normal operation? • Which listed paths usually indicate an abnormal or emergency condition rather than routine, ongoing operation? • In a low‑pressure system, where does air tend to leak into the system, and from where would that mixture most likely be vented out to the atmosphere?

✅ Before You Answer

• Identify which option represents a device that routinely vents to atmosphere during normal operation, not just during failures. • Distinguish between designed venting and accidental leakage paths. • Recall the purpose of the purge unit in low‑pressure centrifugal chillers and how it handles non‑condensables and refrigerant.