DC Practical Damage Control/Compartmentation Frequently Tested Questions And Verified Answers With Rationales

On isometric damage control diagrams, what type of information is indicated by dotted lines?

Hidden boundaries, piping, and valves

What term is used to describe the division of the interior areas of a ship's hull into smaller spaces by the use of structural members?

Compartmentation

What do the four parts of a compartment number identify?

Deck number, frame number, position of compartment relative to centerline, compartment use.

List five of the eight subgroup items that may appear on a CCOL.

Access, misc classification, drainage system, plumbing drains, fire-main and sprinkling, sound tube valve and fitting, ventilation system, portable damage control equipment.

When set, provides the least amount of watertightness

X-ray

Set and maintained at sea, and when leaving and entering port during peacetime.

Yoke

Set when general emergency is sound

Zebra

Set when darken ship is required

Dog zebra

Fittings that serve vital piping and ventilation

William

When is the damage control closure log required to be maintained?

At all times

On the damage control closure log, what three items of information are provided in the column titled "identification of fittings"?

Type, number, classification

While in port, at home port, what condition is set and maintained as a minimum between the hours of 0630-1900 daily?

X-ray

Besides identifying the space, what other information is identified on the compartment bull's-eye?

Division responsible

Which of the following correctly identifies classification tags attached to fittings?

Zebra fitting have red tags: X-ray, yoke, Williams and dog fittings have black tags.

All sounding tube caps will be classified __.

Circle X-ray

Which type of fitting does NOT need to be logged each time the ship's material condition is set or checked?

Out of commission fittings

What can be used to plug or patch a hole?

Anything available

How many gallons of water per minute will flow through a 4in hole at 6ft below water line?

770 gal per min

Cover holes with jagged edges protruding inward, held in place by shoring or welding.

Box patch

Covers holes with jagged edges protruding inward, held in place using a folding T-bolt.

Bucket patch

Used for protruding outward holes.

Plate patch

Used on small (18" or less) inward protruding holes. Usually round and hinged through the center

Hinge patch

What two types of personal protection safety equipment should always be used when plugging or patching?

Helmet, steel-toe boots

What are three types of patches used on pipes for repair?

Jubilee, soft patch, syntho-glass

Which type of patch is modification of a commercial hose clamp?

Jubilee

What fibrous material is used to wrap around a plug or wedge prior to inserting?

Oakum

Which type of pip patching should NOT be used with high-pressure steam lines?

Soft patch

After patching a pipe with syntho-glass, how long should you wait before restoring pressure to the piping system?

30 minutes

What two pieces of personal protection equipment must be worn when using syntho-glass patches?

Eye protection, latex gloves

What two chemicals can be used on the skin to remove resin in the syntho-glass patch?

Alcohol, acetone

When flooding is discovered, what are the four most important pieces of info to pass as soon as possible?

Location, type of flood, depth of flood, source of flood

What are the three dewatering systems most typically installed on Coast Guard Vessels?

Installed Eductors, installed pumps, installed gravity drains

What valve on the installed Eductor system must be open to avoid accidental back flushing?

Discharge valve

What are three commonly installed pumps used to dewater ship spaces?

Fire pump, ASW pump, ballast pump

Which of the following is NOT a component of the electric submersible pump?

Check valve

List three methods in which the sub pump can be used to dewater a space.

Submersed, without submersing, in series

What two things must you do when operating the sub pump out of water?

Attach foot valve/strainer, prime the pump by filling it with water

What are jet-type pumps that contain no moving parts called?

Eductors

When using a portable Eductor, back flushing ante caused by what?

Restriction in discharge hose, insufficient water pressure

Why should you NOT use the CG-P6 pump below decks or in confined space?

Risk of Carbon monoxide poisoning

List four major components in shoring operations.

Shore, shore, strong back, wedge

Which of the following is an advantage of using wood shoring versus metal shoring?

Can be cut to exact size

What method of shoring is the simplest and strongest?

Direct pressure, I type

What is another name for the triangulation method of shoring?

K type

What is the weakest method of shoring?

Cross axial, H type

What is used to layout "K" type shoring when a shoring batten is not available?

Carpenters square, folding rule (or tape measure)

When laying out shoring with a framing square, what is used to determine the length of the shore and the angles that must be cut on each end of the shore?

Rise, run

When passing metal shoring, you must always keep the screw jack end in what direction?

Down

When shoring a watertight door or hatch with six dogs, how many shoring pressure points should be applied?

Six

When should the DC closure log be updated?

When there is a change in the status of a classified closure or fitting

What material condition must be set while underway?

Yoke

What is the simplest method of plugging a small hole?

Square-end plugs

What is the very first entry made at the top of a DC message blank?

Time

What does a casualty letter designation within a circle mean on the DC message blank?

Casualty engaged

Which of the following pipe patches requires 30 minutes for complete curing?

Syntho-glass

Which of the following pumps used a Venturi effect to draw water out of a space?

Eductors (jet-type pump)

Which of the following pumps requires use of a 2 1/2in discharge hose?

Submersible pump

Which of the following equipment can be used to lower the sub pump into a flooded compartment?

Basket strainer

Which of the following pumps is capable of delivering over 250 gpm at a 12ft suction lift through a 3in diameter suction hose?

CG-P6 portable pump

A flat plate or block that can be placed under the end of a shore to span irregularities is a __.

Shole

What is the simplest and strongest shoring method?

Direct pressure

In which type of shoring is forced exerted across the grain (long axis) of the shore?

Cross axial

The length of a shore should NEVER be more than how many times its minimum thickness?

30

What can be used to quickly determine the required length and angles to be cut for shoring?

Batten

When shoring doors and hatches, the basic rule is to put how many points of pressure on the closure?

One for every dog on the closure

Damaged pipes can normally be isolated by closing a __ on each side of the damaged section of pipe.

Cutout valves

List three piping systems that should be repaired immediately if damaged.

Firemain, ASW, chill water

What is the disadvantage of rigging a jumper system between fire stations?

Lose the use of two fireplugs for firefighting

What gate(s) do you remove from the fireplugs to rig a temporary jumper between fire hose stations to bypass damaged pipe?

WYE

What should you use to hold flanges in place on both sides of a replaced ruptured section of pipe?

Bolt or C-clamps

How should you normally isolate/bypass a damaged piping system?

Close the cutout valves

What is the QUICKEST way to bypass a ruptured pipe and restore pressure to the rest of the firemain?

Rig a jumper

What kind and size of thread should a flange have to rig a bypass for damaged pipe?

Male, 2 1/2in

When repairing a ruptured firemain using fireplugs, what should you use to connect the two lengths of hose?

2 1/2in female coupling

What document provides an itemized list of all classified fittings and closures used by DC personnel to set specific material conditions of readiness?

Compartment check-off list

Under what section on the CCOL will you find information that tells damage control petty officers which fittings are opened or closed when material conditions are set?

Material condition status

Which of the following headings is NOT used by the Coast Guard on the CCOL?

Oxygen, nitrogen, and inert gas valves

Which of the following should NOT be used to verify fitting information on the CCOL?

Naval engineering manual

Fireplugs are not classified, but they are required to be numbered and listed under which of the following CCOL sections?

Firemain, sprinkling and washdown

In which document can you verify the pipe runs and fittings listed on the CCOL?

DC diagrams

Recommended changes to the CCOL or DC Books MUST be submitted __.

Through the chain of command to ELC-02