🔍 Key Concepts

• Purpose of the lube oil system in a steam propulsion plant (what are you ultimately trying to protect?) • How pressure changes through restrictions (like orifices, filters, and long piping runs) relate to what actually reaches the bearings • Why the “weakest/most distant point” in a system is often the best indicator of safe operation

💭 Think About

• Which location’s pressure reading tells you what is really getting to the bearings that need lubrication, not just what the pump is producing? • If a restriction or partial blockage develops in the system, at which point would the pressure drop show up most clearly in terms of risk to the machinery? • Think about which pressure would still look normal even if downstream components were being starved of oil.

✅ Before You Answer

• Identify which option corresponds to the actual bearings’ supply condition, not just system or pump output. • Consider how pressure drops over distance and through orifices affect what the farthest bearing receives. • Ask: If something starts to plug up, which gauge would give the earliest warning of danger to the bearings?