Propulsion system

Question 1

State the purpose of the main engines (turbines)

Answer 1

Provide power via the gearbox to drive the SM

Question 2

State the purpose of the raft

Answer 2

1. Support the main engines, gearbox and TG’s
2. Protect against shock
3. Minimises vibration by use of resilient mounts

Question 3

State the purpose of the main engine clutches

Answer 3

Engages and disengages the main engines from the gearbox

Question 4

State the purpose of the main gearbox

Answer 4

Provides a reduction of 50:1 from the main engines

Question 5

State the function of the EPM

Answer 5

1. Provides propulsion in the event of reactor SCRAM

2. Provides propulsion in the event of a loss of main engines

Question 6

State the function of the EPM clutch

Answer 6

Engages and disengages the EPM from the main gearbox

Question 7

State the function of main engine turning gear and motor

Answer 7

1. Slowly turns the gearbox for inspections

2. Slowly turns the shaft for defect rectification and maintenance

Question 8

State the function of the turning gear clutch

Answer 8

Engages and disengages the turning gear from the main gearbox

Question 9

State the function of the flexible couplings

Answer 9

Allows for misalignment between the gearbox and thrust block

Question 10

State the function of the thrust block

Answer 10

1. Transmits drive from the propulsor to the pressure hull

2. Protects the gearbox from generated thrust

Question 11

State the function of loose couplings

Answer 11

Allows the complete removal of the tail shaft

Question 12

State the function of the torsion meter

Answer 12

Measures torque within the shaft

Question 13

State the function of shaft seals

Answer 13

Prevents sea water ingress into the SM

Question 14

Function of the propulsor

Answer 14

Provides propulsion

Question 15

Function of the SPM

Answer 15

Used primarily on leaving or coming alongside

Question 16

state the location of the SPM’s

Answer 16

Number 6 MBT port and stbd

Question 17

State the operating supplies of the SPM

Answer 17

1. External hydraulics to raise, lower and manoeuvre

2. Electrical supplies are 440v AC essential

Question 18

State the different modes of SM propulsion

Answer 18

1. Double main engine drive (DMED)
2. Single main engine drive (SMED)
3. SPM
4. EPM

Question 19

Procedure for evacuating in the event of a steam leak

Answer 19

1. Raise the alarm
2. Vacate the compartment and report to man room giving details of leak site
3. You may not see a steam leak so take care when vacating
4. Ensure when evacuating a compartment to do it by the safest possible means
5. Be aware of escape scuttles that have been opened