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UWSH Study Guide > Cofferdams > Flashcards

Cofferdams Flashcards

1
Q
  1. What chapter is shaft lamination?
A

13

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2
Q
  1. What are the 4 components do you apply on a shaft?
A

Primer, elastomeric, paint fairing compound, GRP

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3
Q
  1. What does GRP stand for?
A

Glass Reinforced plastic

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4
Q
  1. How long for it for GRP to set?
A

12 hours for first 2 wraps 12 hours for second 2 wraps

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5
Q
  1. How do you apply GRP?
A

1 and 3 are with the rotation with the shaft. 2 and 4 are the opposite way.

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6
Q
  1. What type of cofferdam do you use to do the shaft wrap?
A

Dog house dry chamber

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7
Q
  1. What chapter is cofferdams?
A

16

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8
Q
  1. Types of Cofferdams?
A

Patches, Plugs, Dry chambers, shaft seals

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9
Q
  1. J bolt measurements? Made of?
A

5/8” 3/8” Dropped forged steel

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10
Q
  1. DC plug protrusion?
A

3-4 in

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11
Q
  1. DC plugs made of?
A

Yellow Pine, Douglas Fur

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12
Q
  1. 2 types of Plugs?
A

Mechanical and wooden

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13
Q
  1. Where do you put the eye bolt on the DC plug? Why?
A

Off to the side so you can hit the hammer on the center

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14
Q
  1. Explain how mechanical plugs work?
A

Tighten wing nut to expand rubber into the hull opening of the ship

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15
Q
  1. What do you do with wooden dc plugs before installation?
A

Soak them

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16
Q
  1. Cofferdam materials for surface ship?
A

¼ 5000 Aluminum Steel, ¼ mild steel, 1” Marine grade Plywood

17
Q
  1. Cofferdam materials for sub?
A

1/8 5000 Aluminum, 16 Gage stainless steel

18
Q
  1. Foam material for cofferdams
A

Closed Cell, Type 2, Class B/C, Grade 1 or 2 above 35 Grade 2 below 35

19
Q
  1. Ways to attach a cofferdam?
A

Clamps, wire rope, strong back, j bolt, belly band, Magnets

20
Q
  1. Appendix’s for cofferdam
A

A: Cofferdam Materials
B: Dry chamber min calculations
C: Patch and Plug Inspection
D: Patch and Plug Installation
E: Divers min. training cofferdam
F: J bolt measurement requirements
G: Ship’s Requirements on cofferdam installation and removal

21
Q
  1. Parts of a Jbolt?
A

Bushing, spring, wingnut, standoff, jbolt

22
Q
  1. Ways to check cofferdam integrity?
A

Diver swim by, video camera, white water, vent hose floating, check for leaks, ships flood alarms

23
Q
  1. MARMC approved cofferdams?*
A

Dc Plug, flat patch, box patch, dry chamber, shaft wrap

24
Q
  1. Min Cofferdam foam can be compressed?
A

3/8

25
Q
  1. When would you template? What is the measurement?
A

When the hull of the ship is curved and the cofferdam comes off greater than one inch.

26
Q
  1. List ingredience for benski? How many rolls can you use per chapt. 16?
A

Rosin S25/W30 lb
Cooking oil 5gal
Cheesecloth 6x1
Bees wax 25lb
Tallow 2/3lb
Paraffin 2lb
1.5 rolls

27
Q
  1. How do you attach a cofferdam without a grate?
A

Strong back, belly bands

28
Q
  1. What is the definition of a cofferdam?
A

Any plug, patch, or dry chamber installed externally to the hull of a ship or sub below the waterline in order to secure/dewater area or system in order to conduct maintaince/repairs.

29
Q
  1. Types of patches?
A

Flat, box, tombstone, thermos barrier

30
Q
  1. Where do you put the vent hose and the educator?
A

Vent hose is above the eductor

31
Q
  1. How do you dewater a space without a vent hose and educator?
A

Blow your pnumo into space and create a seal with the cofferdam. Ship will vent internally

32
Q
  1. Explain the process of the stern tube seal?
A

Clam shell connects as a half moon to a full moon around the stern tube, hand tighten the clamp, Install two piece backing plate with all threads. Fully tighten backing plate to stern tube. Use all threads to push the clam shell flush with the stern tube opening. Then fully tighten clam shell. Check for leaks.

33
Q
  1. What type stern tube coff. Do you use for the CG port side? Why?
A

Fat Rope because the angle the stern tube comes out of the hull of the ship

34
Q
  1. Requirements for single valve?
A

Coms in space to divers
2 sources of dewatering
Blank
CO signature/permission
Divers on standby

35
Q
  1. 2 types of seals in a stern tube?
A

Clam shell, inflatable boot

UWSH Study Guide (7 decks)

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