1. Perform as a Member of a Hull
Inspection Team
052-238-1650
By: SGT GARCIA
2. Table of Contents
• References
• Task, Conditions, and Standards
• Types of Inspections
• Cleaning and Inspection Tools
• Major Components
• Performance Steps
3. References
• FM 20-11: Military Diving
• NAVSEA S0600-AA-PRO-010, NAVSEA S0600-
AA-PRO-160, NAVSEA S0600-AA-PRO-170:
Underwater Ship Husbandry Manuals
• NSTM S9086-CQ-STM-010: Waterborne
Underwater Hull Cleaning of Navy Ships
4. Task, Conditions, and
Standards
• Task: Perform as a Member of a Hull Inspection Team
(052-238-1650)
• Conditions: As a diver in a field environment, you are given
orders to conduct a hull inspection, the appropriate diving
equipment, an underwater photographic and video set, and
an underwater construction tool kit.
• Standards: Perform as a member of a hull inspection team,
noting all variations from the ship drawings and utilizing
underwater camera systems and measurement devices.
5. Types of Inspections
• Level 1 inspections are visual inspections documented in
writing and recorded on diver hull inspection data forms
(NAVSEA 4730). Supplement documentation such as color
photographs and/or color video should be used to depict the
condition of the hull and appendages.
• Level 2 inspections are system specific inspections which
require detailed measurements and assessment of the system
be recorded on the appropriate diver hull inspection forms.
Additional sketches should be provided which clearly
document the extent of damage and color photographs
and/or color video should be used to record the condition of
the system.
6. Cleaning and Inspection
Tools
• Putty Knife
• Wire Brush
• Brush
• Hull Scrubber
• Green scratch pads
• Pressure Washer
• Calipers
• Machinist Ruler
• Camera
7. Major Components
Bow Thruster
•On all Boats, your going to need to
inspect both sides for damage and over
growth
•Look at the fins and propeller (screw)
for bent or broken pieces
•Check to make sure the propeller is
free of any debris i.e. rope and large
growth.
8. Major Components
Keel Cooler
•The keel coolers are underwater radiators for the ships engines.
•These need to be inspected thoroughly to make sure there are
no signs of damage that could cause a leak
•They need to be cleaned and cleared of all debris and growth
9. Major Components
•The rudders and rear
propellers need to be
inspected for damage
•Thoroughly inspect each
propeller fin for major damage.
i.e. “dog eared”
•Look for tangled rope in the
joint areas and make sure all
moving pieces have free
operation.
Rudders and screws
10. Major Components
Sea Chest
•Size, shape and location may change on all the different models of boats
but they all have the same operations, to allow a large amount of water to
flow in to the ships ballast, also it helps cool the engines
•Make sure the grate is free and clear of debris and overgrowth, check to
make sure the bolts are all there.
11. Major Components
•The drive shaft is a long
cylindrical shaft that
transfers power from the
engine to the propeller
•This should be kept clean
of growth.
•Fishing line and net
has a tendency to get
wrapped around it
and work its way into
the packing areas
- Packing area -
Drive Shaft
12. Major Components
Can you count how many anodes
are in this picture? In 10 sec? 19
•Anodes can come in all shapes
and sizes
•Be sure to check all anodes for
corrosion
•Give an estimated percentage
of the remaining anode
Zinc Anodes
13. Performance Steps
1. Assemble the diving equipment
a. Verify the camera system has adequate available
memory and battery life
b. Review the diagrams of the ship and the previous
hull inspection form
c. Ensure that measuring devices are available, such
as a machinist ruler and calipers
14. Performance Steps
2. Conduct a Level 1 or Level 2 inspection
a. Annotate the measurements
Note: Measurements should be annotated according
to NAVSEA S0060-AA-PRO-170, Table 17-3.1
b. Apply common terms associated with any
common damage
Note: Terms of damage should be applied according
to NAVSEA S0600-AA-PRO-10
c. Record the condition of the hull
16. Terms of Damage
a. Crack. A linear rupture of material under stress. Cracks may form anywhere on a
surface, but are usually found near an edge or joint. Cracks have depth, length, and
width and are not simply a surface defect.
b. Dent. A hollow area made by a blow or collision. There is no loss of material with a
dent.
c. Gouge. A scooped out, shallow area or groove in the material caused by contact or
collision with a hard object. This is common on softer material such as sonar dome
rubber windows and shaft coatings, but may also be found on hull plating.
d. Scratch. A narrow surface defect that can be felt, but which has no depth into the
material. Typically, scratches can be buffed out.
17. Terms of Damage
e. Surface indication. Any inconsistency of the surface that looks like
a scratch or “hair line crack” but cannot be felt or buffed out.
f. Tear. Pulled apart or separated by force, common on the leading
edge of a bilge keel or a sonar dome rubber window.
g. Delamination. Separation between layers, common on shaft
coatings and sonar domes. Delaminations may be obvious with
entire sections of material lost or may be hidden as a subsurface
failure. Subsurface delaminations may appear as bulges.
h. Discontinuity. Any imperfection (e.g., surface indication or crack)
in the material that has been confirmed with an approved non-
destructive test procedure using qualified personnel.
18. Performance Steps
3. Identify objects not on the diagram of the ship, such as
mines.
a. Search for mines.
1) Ensure that you do not expose any mines to movement, light, or high magnetic
signatures because they can be detonated in a variety of ways.
2) Use extreme caution when searching, and do not touch or move any mines.
b. Mark the location of a mine.
1) Use a grease pencil , and mark the depth of the mine on the hull above the water
line with an arrow pointing towards the location of the mine.
2) Record the approximate height, width, and depth of a mine and any words,
symbols of color markings
19. Performance Steps
4. Use the running log, photographs, video, and
diver’s notes to fill out the hull inspection
forms after completing the dive.
