During maneuvering on a slow speed diesel...

Question 1 / 2066636eef28f7522a1c51ff01

Question 1 of 2066636eef28f7522a1c51ff01

During maneuvering on a slow speed diesel engine vessel, a low starting air system pressure alarm is activated. Local starting air receivers' pressure gauges indicate proper pressures, and compressors are running and are 'loaded' up. What could cause the alarm?

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🔍 Key Concepts

• Starting air system layout from compressors → receivers → main starting valve → distributor → cylinder starting valves • How a stuck open valve or leak affects air pressure and compressor loading • Where a low starting air pressure alarm usually senses pressure in the system

💭 Think About

• Look at each option and ask: Would this mainly affect pressure in the receivers or just the distribution of air to cylinders during starting? • If compressors are running and are described as 'loaded', what does that tell you about the actual pressure and air demand in the system? • Compare the local pressure gauge readings with the alarm: if they disagree, which component(s) in the chain are most likely at fault?

✅ Before You Answer

• For each choice, decide: Would this cause the receiver/system pressure to drop enough to trigger a low-pressure alarm? • Think carefully about the location of the alarm pressure switch versus the local gauges: are they sensing the same point in the system? • Verify which components (distributor valves, cylinder starting valves, main starting valve, alarm switch) primarily affect starting sequence and which affect overall system pressure indication/alarm.

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Question 1 of 20

Malfunctioning starting air cylinder distributor valves.

A stuck open air starting valve on one of the engine cylinders.

Malfunctioning, stuck open, main engine air starting valve.

Faulty system alarm pressure switch and/or a fault in the alarm circuit.

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Question 1 / 2066636eef28f7522a1c51ff01

Question 1 of 2066636eef28f7522a1c51ff01

Back

Question 1 of 20

66636eef28f7522a1c51ff01

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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