DDG/CG Hulls and Components

Question 1

50. What chapter is Mask Emitter belts?

Answer 1

5

Question 2

51. What happens when the belt meets the bilge keel?

Answer 2

Goes through the bilge keel

Question 3

52. Size of the holes in Masker emitter belt?

Answer 3

3/64”

Question 4

53. What is the Mask Emitter belt made of? Ratio? And why is it not painted?

Answer 4

Copper Nickle 90/10
can clog the emitter holes

Question 5

54. Speed of hydro lance and how long?

Answer 5

9000-1000PSI 85 min per 24 hours

Question 6

55. Where is the cleanout plug?

Answer 6

At the bottom of the mask emitter belt

Question 7

56. What do you hook up to a clean out plug?

Answer 7

Eductor

Question 8

57. How many belts do DDG? CG?

Answer 8

DDG: 3 PAIRS
CG: 4 pairs

Question 9

58. Where are Masker Emitter belts located?

Answer 9

Forward of the engine spaces

Question 10

59. Purpose of Mask Emitter belts?

Answer 10

To mask noise made by the engine spaces

Question 11

100. What is a common suction?

Answer 11

Where two suctions meet together from inside the ship into one sea chest opening.

Question 12

101. Waster sleeve used for?

Answer 12

A protection sleeve for small piping inside a sea chest to keep large debris from entering

Question 13

113. What is 081 NSTM?

Answer 13

Hull Cleaning

Question 14

117. What are the 4 classes of stave bearings?

Answer 14

Metallic less than 6” dial shaft
Metallic greater than 6” dial shaft
NonMetallic less than 6” dial shaft
Non Metallic greater than 6” dial shaft

Question 15

121. Range gap for the feeler gauge measurements?

Answer 15

.1-.5

Question 16

122. How long can a ship go before jacking a shaft?

Answer 16

14 days

Question 17

123. Access to Staves?

Answer 17

Deadlight holes, cover plates under the struts, mud tank, rope guard on sub

Question 18

124. How long are staves?

Answer 18

Come in 6 feet measurements

Question 19

125. How long are stave shells?

Answer 19

8-14’

Question 20

126. What are staves made of?

Answer 20

Rubber

Question 21

132. 2 types of seals in a stern tube?

Answer 21

Clam shell, inflatable boot

Question 22

133. What is a Ship’s primary Anti corrosive?

Answer 22

AC PAINT

Question 23

134. What chapter is Cathodic Protection?

Answer 23

19

Question 24

135. What are the components of ICCP ?

Answer 24

Reference cell, power supply, power controller, stuffing tube, anode, dielectric shield

Question 25

136. The purpose of dielectric shields?

Answer 25

To keep the current from shorting with hull, disperse current to cover more area

Question 26

138. Sizes of Anodes?

Answer 26

2,4,8

Question 27

139. When do you need to replace Anodes?

Answer 27

50% DEGRADED, Hard to read

Question 28

140. 2 Categories of CATHODIC PROTECTION?

Answer 28

Active, Passive

Question 29

143. Rule for diving on ICCP?

Answer 29

Full Rubber 15ft, comms with ship

Question 30

144. Explain Sacrificial Current Protection?

Answer 30

Greater negative current attracts current away from the hull of the ship and to the sacrificial anode

Question 31

179. Explain a fixed Rod meter change out on a Surface ship?

Answer 31

-internal
-gas free chit, single valve chit, day before ships force disconnects cable, put brass fitting on, make sure dowel rods do not spin
-Next day gas free chit
-take brass fitting off
-take off snap ring
-take boss nut off
-take o-ring off and gasket
-put brass fitting back on
-install jacking fixture
-notify topside
-jack rod meter out
-use petcock valve to check for leaks
-external
-install clamshell c/d as a bouye around rod meter
-have emergency rubber cofferdam ready if leaks are there

Question 32

180. What do you have to replace on retractable rod meters often?

Answer 32

7 layer chevron packing on the cutlass bearing, and above the retractable valve opening

Question 33

221. Radcon Boundaries on a Carrier?

Answer 33

2 AND 3 ZONES