Main Propulsion Diesel Engine

Question 1

Who represents the CHENG while on watch, inport?

Answer 1

Engineering Duty Officer (EDO)

Question 2

Who monitors the performance of propulsion equipment while underway?

Answer 2

Propulsion Auxiliary Control Console (PACC) Operator

Question 3

Who monitors the performance of generators while underway?

Answer 3

Electrical Plant Control Console (EPCC) Operator

Question 4

Who represents the CHENG while on watch, underway?

Answer 4

Engineering Officer of the Watch

Question 5

Who conducts a continuous patrol of unmanned spaces taking periodic soundings of
tanks and spaces while underway?

Answer 5

Sounding and Security

Question 6

Who conducts a continuous patrol of unmanned spaces taking periodic soundings of
tanks and spaces while underway?

Answer 6

Sounding and Security

Question 7

(MAIN PROPULSION) Who manufactures the main propulsion diesel engines?

Answer 7

Colt-Pielstick

Question 8

(MAIN PROPULSION) How many main propulsion diesel engines are onboard?

Answer 8

4 Main Propulsion Engines: 1A/1B in Main 1 AND 2A/2B in Main 2

Question 9

(MAIN PROPULSION) What is the maximum RPM for the main propulsion diesel engines?

Answer 9

520 RPM maximum

Question 10

(MAIN PROPULSION) What is the length of the port shaft?

Answer 10

Line shaft bearings – 3

Question 11

(MAIN PROPULSION) What is the purpose of the lube oil for the main propulsion diesel engines?

Answer 11

Lube oil cools, lubricates and cleans engines

Question 12

(MAIN PROPULSION) What fluid acts like anti-freeze in the main propulsion diesel engines?

Answer 12

Jacket water – cools main engines, acts like anti-freeze (distilled water that is
chemically treated with Nalcool)

Question 13

(MAIN PROPULSION) How many cylinders are in the main propulsion diesel engines?

Answer 13

16 cylinders - V16

Question 14

(MAIN PROPULSION) How many line shaft bearings are on the stbd shaft?

Answer 14

9

Question 15

(MAIN PROPULSION) What is the length of the stbd shaft?

Answer 15

350 ft.

Question 16

(MAIN PROPULSION) What is the length of the port shaft?

Answer 16

195 ft.

Question 17

(MAIN PROPULSION) What is the rated horsepower of the main propulsion diesel engines?

Answer 17

10,400 break horsepower

Question 18

(MAIN PROPULSION) What type of water cools the main propulsion diesel engines?

Answer 18

Jacket water

Question 19

(MAIN PROPULSION) What type of water cools jacket water?

Answer 19

Central Fresh Water (CFW)

Question 20

(MAIN PROPULSION) What type of water cools central fresh water (CFW)?

Answer 20

Main Saltwater Pumps (MSW)

Question 21

(MAIN PROPULSION) What type of air is used to start the main propulsion diesel engines?

Answer 21

Medium Pressure Air

Question 22

(MAIN PROPULSION)

What type of lube oil is used in the main propulsion diesel engines?

Answer 22

Uses 40wt lube oil made by Shell

Question 23

(MAIN PROPULSION)

True of False: The main propulsion diesel engine starting air is inserted on the left engine bank.

Answer 23

FALSE; started with medium pressure air on the Right engine bank

Question 24

(MAIN PROPULSION)

What is the idle RPM of the main propulsion diesel engine?

Answer 24

180 – 200 RPM idle

Question 25

(MAIN PROPULSION) What type of fuel can be used for the main propulsion diesel engines?

Answer 25

Diesel Fuel Marine (DFM) and JP-5

Question 26

(MAIN PROPULSION) Where are the main propulsion diesel engines located?

Answer 26

1A/1B in Main 1

2A/2B in Main 2

Question 27

(MAIN PROPULSION)

True of False: Both shafts route inward, towards the centerline?

Answer 27

TRUE

Question 28

What is the idle RPM for the main propulsion engine?

Answer 28

180 - 200 RPM Idle

Question 29

Where is the Main thrust bearing?

Answer 29

Mounted to hull of ship, toward forward end of Main Reduction Gear (MRG)

Each shaft has a thrust
bearing that converts power from the shaft and propeller hub to the ship‘s hull.

Question 30

Explain MRG?

Answer 30

Main Reduction Gear - Ratio of 3.14 : 1; One MRG per main engine. (2)
Purpose: Turn high speed / low torque to low speed / high torque

Two engines are
attached through a main reduction gear to turn a shaft system with a controllable pitch propeller and
there are two separate shaft systems.

Question 31

Explain CPP?

Answer 31

Controllable Pitch Propellers

Control direction and amount of thrust

Allow ship to produce astern propulsion without changing the direction of shaft rotation

2 16.08 ft (4.9 m) 5 blade propellers designed for 20,800 SHP and 165 rpm

2 Rudders

The propellers incorporate controllable pitch blades with a new
high power low drag hub design that provides improved propeller efficiency.

Question 32

Explain Main Propulsion

Answer 32

The Main Propulsion engines are four Colt-Pielstick Medium Speed Turbocharged Marine Diesels rated at 10,400 horsepower each, for a total of 41,600 shaft horsepower which can move the ship in excess of 22 knots. The main propulsion system is a two-shaft system. Each shaft system consists of two engines coupled to a single reversing main reduction gear
turning a shaft with a controllable pitch, five blade, high power, low drag propeller hub

Question 33

What is the main purpose of the main propulsion system?

Answer 33

The purpose of the main propulsion system is to provide continuous power to move the ship through
the water. The Main Machinery Rooms provide space for the ship‘s main propulsion diesel engines
(MPDE), reduction gears and other propulsion related systems and various auxiliary systems. The main
propulsion system consists of 4 diesel engines, 2 main reduction gear sets, 2 shafts and 2 controllable
pitch propellers. Both main machinery rooms contain identical main propulsion equipment

Question 34

MPDE details?

Answer 34

Colt Pielstick
2.5 STC
10,400 horsepower each, for a total of 41,600 shaft horsepower

Question 35

Where are the MRG’s located?

Answer 35

Main Reduction Gears on the ship are located in the main machinery rooms and are attached to the
aft end of the main engines. There is one reduction gear set in each main machinery room connected
to the two main propulsion diesel engines in that space. The reduction gear configuration allows the two
propellers to turn inboard and over the top. The main reduction gears reduce the high-speed engine
rpm of the MPDE from 520 rpm to a useable 165 shaft rpm producing 234,300 lb. of thrust. The main
reduction gears are a single reduction, double input and double helical, locked train gear system

Question 36

What is Propulsion Shafting?

Answer 36

The shaft system converts power and torque from the MPDE and applies it to the ship‘s controllable
pitch propeller system.

Question 37

What are the bulkhead seals?

Answer 37

Bulkhead seals are installed in watertight bulkheads, around the shaft where the shaft passes
through the watertight bulkhead, to prevent progressive flooding. Each shaft has a thrust bearing that converts power from the shaft and propeller hub to the ship‘s hull. Line shaft bearings are
installed at intervals along the length of each shaft to support the weight of the shaft system.

Question 38

What are stern tube seals?

Answer 38

Stern tube seals prevent seawater from coming in around the shaft where the shaft exits the ship‘s
hull

Question 39

What is the purpose of the CPP system?

Answer 39

The purpose of the Controllable Pitch Propeller (CPP) System is to apply torque from the shaft system
to the propeller. The CPP applies thrust to the propeller system to move the ship through the water.
The CPP is an electro-hydraulic system designed to function automatically. When a malfunction occurs
in the automatic CPP system, the system can be switched to manual ahead mode. The
propellers are five blade propellers with a high power low drag propeller hub. Each propeller is 16 feet
in diameter and turns inboard over the top.