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hull inspection class
- 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 divers notes to fill out the hull inspection forms after completing the dive.
- 20. Questions?
Editor's Notes
- #8: Bow thruster