How is the axial clearance indicator used on...

🔍 Key Concepts

• Axial clearance in marine steam or gas turbines (what it is and why it matters) • Where the axial clearance indicator must physically touch (rotor, boss, bearing, or bridge) to give a meaningful measurement • Difference between directly reading a clearance vs. using shims or separate gauges to obtain that clearance

💭 Think About

• Which option describes taking a measurement directly from the indicator after bringing it into contact with the rotor or a fixed reference? • Which choices introduce extra tools (like shims or a bridge gauge) that sound more like indirect methods or different types of measurements? • Think about how engineers normally measure a small end‑play or axial movement on rotating machinery: do they stack shims, span across bearings, or read motion on a small calibrated arm or plunger?

✅ Before You Answer

• Identify which option clearly has the indicator’s sensing arm or contact point touching the end of the rotor or a fixed reference surface. • Check whether the method described allows you to read the clearance directly on a graduated scale without additional measuring steps. • Eliminate any choices that mostly describe using other tools (bridge gauges, depth‑gauge wells, shims) as the main measuring device instead of the axial clearance indicator itself.

How is the axial clearance indicator used on a turbine?

The axial clearance indicator is inserted in the depth gauge well until it rests on the reference boss, and the reading is noted.

After the axial clearance indicator is screwed into contact with the rotor, shims are placed in the clearance well, and the thickness is measured.

The arm of the axial clearance indicator is pushed so contact is made with the end of the rotor, and the reading on the scale is noted.

A bridge gauge is placed across the bearing, and the gap between bridge and rotor is measured by the axial clearance indicator.

🔍 Key Concepts

💭 Think About

✅ Before You Answer