On a steam turbine vessel with a propeller...

Question 1 / 2066636ef128f7522a1c5219e4

Question 1 of 2066636ef128f7522a1c5219e4

On a steam turbine vessel with a propeller type, electrically driven, main circulating pump, one suspects condenser tube or inlet tube sheet fouling. Do not consider vacuum variations since they may be due to sea water temperatures. What on-board electrical test instrument can one use to verify condenser fouling?

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66636ef128f7522a1c5219e4

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🔍 Key Concepts

• Centrifugal pump load vs flow – how motor amperage changes when flow is restricted or system is fouled • Pump power curve – what happens to input power when discharge side is blocked or passages foul vs when flow increases • Relationship between electrical measurements (amps/volts) and mechanical work done by the motor-driven pump

💭 Think About

• If condenser tubes foul, does the circulating pump see more flow or less flow? More resistance or less resistance? How does that affect the pump’s hydraulic load? • For an induction motor driving a centrifugal pump, when the pump does less water-moving work (because of restriction), does current usually go up or down compared with rated full-load current? • Would a change in condenser fouling be more clearly seen by monitoring current (amps) or voltage (volts) at the motor controller?

✅ Before You Answer

• Be clear on how centrifugal pumps behave when discharge is throttled or passages are fouled – what happens to power draw. • Recall that line voltage in a healthy shipboard system stays essentially constant; what usually changes with load is current (amperage), not voltage. • Compare each answer choice with the expected direction of current change (above or below design full‑load amps) when pump flow is reduced by fouling.

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Question 1 of 20

Amp meter on controller leads. lower than designed full load amperage will indicate potential fouling.

Amp meter on motor controller leads. Higher than design full load amperage will indicate potential fouling.

Volt meter across the controller leads. Lower than system voltage, between legs, will indicate potential fouling.

None, wait to shut down the plant in next port and inspect the condenser visually.

Question 1 / 2066636ef128f7522a1c5219e4

Question 1 of 2066636ef128f7522a1c5219e4

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Question 1 of 20

66636ef128f7522a1c5219e4

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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