SOW PRI2 MOHAWK 2026034 Hull Clean and Inspect.pdf

11000_CDG_0925_270

WORK ITEM 1: Hull Plating, U/W Body, Divers Clean and Inspect

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to clean and conduct inspection of the vessel’s U/W body, while the vessel is moored pier side. Affected surfaces or components include, but are not limited to the following:

• U/W hull plating.

• U/W body coating system.

• Transducer(s)/sonar dome.

• Shaft(s).

• CPP hub, including propellers.

• Rudder(s).

• Sea chest(s) and strainer(s).

• Miscellaneous appendages (examples: bilge keels, rope guards, and fairwaters…).

• Fin stabilizers.

• Hull and sea chest zinc anodes.

1.2 Government-furnished property.

None.

2. REFERENCES

COAST GUARD DRAWINGS

Coast Guard Drawing 905 WMEC 114-001, Rev D, Skeg

Coast Guard Drawing 905 WMEC 114-002, Rev C, Bilge Keels

Coast Guard Drawing 905 WMEC 114-003, Rev B, Shaft Fairwaters & Rope Guards

Coast Guard Drawing 905 WMEC 801-040, Rev H, Docking Plan (USCGC MOHAWK)

COAST GUARD PUBLICATIONS

Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2022, General Requirements

OTHER REFERENCES

Code of Federal Regulations (CFR) Title 29, Part 1910, Subpart T, 2024, Commercial Diving

Operations

3. REQUIREMENTS

3.1 General.

3.1.1 CIR.

None.

3.1.2 Tech Rep.

Not Applicable.

3.1.3 Protective measures. The Contractor must furnish and install all protective measures in accordance with SFLC Std Spec 0000, paragraph 3.3.3 (Vessel component, space, and equipment protection).

3.1.4 Interferences. The Contractor must handle all interferences in accordance with SFLC Std Spec 0000, paragraph 3.3.5 (Interferences).

3.1.5 The Contractor must provide the Coast Guard Inspector 24 hours advance notice of when the diver inspection will occur. Before diving procedures commence, meet with the COR and the Coast Guard

Inspector, to discuss diving safety requirements and the securing of cutter machinery, as applicable.

NOTE

At Contractor’s request, Ship’s force will secure and tag out the cathodic protection system, main engines, steering gear, generator set, A/C unit, fire pumps, and all other machinery which may cause a hazard while a diver is in the water.

3.2 Pre-diving clearance. The Contractor must ensure that the diving team obtains clearance from the

Officer-of-the-Deck before beginning diving operations. Ensure the Coast Guard Inspector has the capability for maintaining continuous two-way communication with diving personnel at all times, during the performance of this work item.

3.2.1 The Contractor must, in accordance with 29 CFR 1910.401-440, provide a certified diver and a tender team, as well as necessary support personnel and equipment, to accomplish the tasks specified herein.

WARNING

Mixed gas diving and live boating are not permitted.

3.3 Cleaning requirements. Using the drawings listed in Section 2 (References), the Contractor must employ suitable means to clean the entire U/W body surfaces free of all marine growth, debris, and all other surface contaminants. The Contractor must ensure the following:

3.3.1 Do not clean transducer surfaces.

3.3.2 Ensure that existing U/W body coating system or non-coated surfaces do not incur any damage during cleaning process.

3.4 Inspection requirements - general. The Contractor must survey the entire U/W body of the vessel, to inspect for abnormal conditions or situations, which may include, but not be limited to the below-listed.

The Contractor must use the drawings listed in Section (References) for guidance and accomplish the following tasks.

• Hull plating and appendage damages.

• Coating system defects or failures.

• Welding corrosion and erosion.

• Deformation in appendages.

3.4.1 Hull plating. The Contractor must inspect the exterior condition of the hull for presence of marine growth, deformation, and any evidence of major corrosion or electrolytic action. Inspect for deformation along the stem and keel areas, condition of butt-welded seams, doubler plates, lap seams, and any signs of damaged plating or unusual waviness in the plating.

3.4.2 Coating system inspection. The Contractor must inspect the condition of the U/W body coating system, for signs of the following:

• Peeling.

• Blistering.

• Abrasion.

3.4.2.1 Use the guidelines provided in Table I (Paint Deterioration Ratings (PDR) for

Antifouling/Anticorrosion (AF/AC) Paint System) and Table 2 (Fouling Ratings (FR) In Order of

Increasing Severity) to assist in proper documentation of the coating system degradation and fouling rate, respectively.

TABLE 1 - PAINT DETERIORATION RATINGS (PDR)

FORANTIFOULING/ANTICORROSION (AF/AC) PAINT SYSTEM

PAINT

DETERIORATION

RATING (PDR)

DESCRIPTION

10 AF paint intact, red in color or with mottled pattern of light green and red.

20 AF paint missing from edges, corners, seams welds, river or boll head to expose AC paint.

30 AF paint missing from slightly curved or flat areas to expose AC paint.

40 AF paint missing from intact blisters to expose AC paint.

50 AF blisters ruptured to expose intact AC paint.

60 AF/AC paint missing or peeling to expose steel substrate, no corrosion present.

70 AF/AC paint removed from edges, corners, seams, welds, river or bolt heads to expose steel substrate with corrosion present.

80 Ruptured AF/AC blisters on slightly curved or flat surfaces with corrosion stains present.

90 Area corrosion of steel substrate with no AF/AC paint cover due to peeling or abrasion damage.

100 Area corrosion showing visible surface evidence of pitting, scaling, and roughening or steel substrate.

TABLE 2 - FOULING RATINGS (FR) IN ORDER OF INCREASING SEVERITY

TYPE FOULING

RATING

(FR)

DESCRIPTION

Soft 0 A clean, foul-free surface; red and/or black AF paint or a bare metal surface.

Soft 10 Light shades of red and green (incipient slime). Bare metal and painted surfaces are visible beneath the fouling.

Soft 20 Slime as dark green patches with yellow or brown colored areas (advanced slime).

Bare metal and painted surfaces may be obscured by the fouling.

Soft 30 Grass as filaments up to 3 inches (76 mm) in length, projections up to 1/4 inch (6.4

mm) in height; or a flat network of filaments, green, yellow, or brown in color; or soft non calcareous fouling such as sea cucumbers, sea grapes, or sea squirts projecting up to 1/4 inch (6.4 mm) in height. The fouling cannot be easily wiped off by hand.

Hard 40 Calcareous fouling in the form of tubeworms I less than ¼ inch in diameter or height.

Hard 50 Calcareous fouling in the form of barnacles less than ¼ inch in diameter or height.

Hard 60 Combination of tubeworms barnacles, less I than ¼ inch (6.4 mm) in diameter or height.

Hard 70 Combination of tubeworms and barnacles, greater than ¼ inch in diameter or height.

Hard 80 Tubeworms closely packed together and growing upright away from surface.

Barnacles growing one on top of another, ¼ inch or less in height. Calcareous shells appear clean or white in color.

Hard 90 Dense growth of tubeworms with barnacles, ¼ inch or greater in height; Calcareous shells brown in color (oysters and mussels); or with slime or grass overlay.

Composite 100 All forms of fouling present, Soft and Hard, particularly soft sedentary animals without calcareous covering (tunicates) growing over various forms of hard growth.

3.4.3 Sea chests and other hull penetrations. The Contractor must accomplish the following:

• Inspect all sea chests and other hull penetrations for signs of any obstructions/marine growth in the openings that might prevent proper suction and discharge of water.

• Inspect for bare metal areas (surrounding penetrations) and for bare metal pitting.

• Inspect for general appearance, loose, damaged, or missing grates, loose or missing fasteners, condition of sea strainers and lockwire on bolt.

3.4.4 Propeller and shaft associated components. The Contractor must inspect the condition of the propeller shafts, struts, fairwaters, and rope guards. Note any loose or missing fairwater or rope guard fasteners.

3.4.4.1 Inspect propellers for corrosion, pitting, erosion, fouling, cracks, dings, curls, and nicks by side and blade.

3.4.4.2 Inspect the condition of the struts, keel drain plugs, rudders, rudder stocks, and rudder bearings, including any damage, pitting on leading and trailing edges of the rudder, and the presence of drain plugs.

3.4.5 Transducers. The Contractor must inspect the general condition of the fathometer transducer.

Record condition of rubber coating and amount of marine growth present. Note in the inspection report any cuts, gouges, or other surface defects found.

3.4.6 Cathodic protection system. The Contractor must visually inspect all zinc anodes, check the soundness of mounting strap and stud welds, missing fasteners, and percentage of remaining material.

3.5 Inspection documentation. The Contractor must document the hull survey as follows:

3.5.1 Written report. The Contractor must record the U/W body coating system fouling rating on the attached “Pre-Clean Bio-fouling Inspection Data” Form.

3.5.1.1 Note all inspection findings and observations, as applicable, on attached observations on the following attached inspection data forms, as applicable, on the attached: “Diver Hull Inspection Data”

Form.

3.5.1.2 In addition to completing the ”Diver Hull Inspection Data” Form, do the following, as applicable:

• Document condition of running gear on attached “Running Gear Inspection Data” Form for each shaft.

• Document propeller condition on attached “Propeller Inspection Data” Form for each propeller.

• Document condition of rudders on attached “Port and Starboard Rudder Inspection Data”

Form.

3.5.2 Audio-video report. In addition to the written documentation specified above, The Contractor must produce an audio-video report, with narration, of all inspected surfaces. Place linear measuring devices, as applicable, in the field of view when videotaping hull damages, to provide scale for these damages.

3.5.3 Documentation submission. Within 24 hours after the completion of the diver inspection, The

Contractor must do the following:

3.5.3.1 Submit both the written and audio-video reports to the COR. Submit the audio-video report on two digital video discs (DVD) formatted to USCG requirements.

3.5.3.1.1 Ensure that all video equipment have the following characteristics/functions:

• Remote video/sound recorder.

• Suitability for underwater use.

• Auto-focus and auto-exposure.

• Color pictures.

• Two-way communication devices, to allow for communication and recording of communications between the diver operating the video camera and the Person-in-Charge, COR, and Coast Guard Inspector.

• Audio/visual cables long enough to transmit the video picture and two-way communications to the recorder and monitor.

• Online video monitor large enough, to allow the Person-in-Charge, the COR, and the Coast

Guard Inspector to observe the video picture.

• Sufficient lighting to ensure a quality color video picture and depth of field.

• A yardstick or other suitable linear measuring device with clear measurement marks which can be read from the monitor.

3.5.3.1.2 Closely monitor the video and sound quality during the survey, to ensure that the pictures on the monitor and the communication sounds remain of high quality. When either video or audio quality deteriorates, ensure that the survey is temporarily halted, until all problems have been corrected.

4. NOTES

4.1 Unit responsibilities. The ship's force will tag-out and secure the following:

• All propulsion machinery and shafting, including auxiliary propulsion machinery such as the bow thruster, and all steering machinery whenever the diver is in the water.

• All underwater body transducers, including the sonar equipment, for the duration of the underwater inspection operation.

• All active cathodic protection equipment for the duration of the underwater inspection operation.

• Each sea suction while the diver is inspecting the sea suction's sea chest strainer.

4.2 Mailing of video record. Upon receipt, the COR will forward the second copy of the underwater video inspection record to the Engineering Section of the Product Line Division to which the vessel is assigned.

4.3 Period of Performance. 17AUG26-21AUG26

4.4 Place of Performance. The primary place of performance will be CGC MOHAWK located at below address:

100 Trumbo Rd Key West, FL 33040

4.5 Point of Contact. LT Michael J Gandara, Engineer Officer (EO). Michael.J.Gandara@uscg.mil

(206)815-3497.

TABLE 3. PRE-CLEAN BIOFOULING INSPECTION DATA

PRE-CLEAN BIOFOULING INSPECTION DATA

VESSEL NAME: HULL TYPE / NUMBER LOCATION (CITY) DATE (mm/dd/yy)

PRODUCT LINE: INSPECTING ACTIVITY VISIBILITY (ft)

LOCATION OF LAST DRYDOCKING UNDOCKING DATE

LOCATION OF LAST PAINTING DATE

PAINT

TYPE: ANTIFOULING: ANTICORROSION:

DATE OF THE LAST WATERBORNE FULL HULL CLEANING DATE OF THE LAST WATERBORNE INTERIM CLEANING

UNDERWATER PHOTOGRAPHS TAKEN □ YES □ NO VIDEO TAKEN □ YES □ NO

COMPONENTS

( CHECK IF: )

N/A NOT INSPECTED

( PERCENTAGES MUST ADD UP TO 100 )

FOULING RATING FOULING RATING FOULING RATING

PROPELLER Centerline FR- % FR- % FR- %

Port Outboard FR- % FR- % FR- %

Port Inboard FR- % FR- % FR- %

Starboard Inboard FR- % FR- % FR- %

Starboard Outboard FR- % FR- % FR- %

SHAFT Centerline FR- % FR- % FR- %

Port Outboard FR- % FR- % FR- %

Port Inboard FR- % FR- % FR- %

Starboard Inboard FR- % FR- % FR- %

Starboard Outboard FR- % FR- % FR- %

RUDDER Centerline FR- % FR- % FR- %

Port FR- % FR- % FR- %

Starboard FR- % FR- % FR- %

SONAR DOME Port Side FR- % FR- % FR- %

Starboard Side FR- % FR- % FR- %

SEA CHEST Typical FR- % FR- % FR- %

BOW Port FR- % FR- % FR- %

Starboard FR- % FR- % FR- %

SIDES Port FR- % FR- % FR- %

Starboard FR- % FR- % FR- %

BOTTOM Port FR- % FR- % FR- %

Starboard FR- % FR- % FR- %

STERN Port FR- % FR- % FR- %

Starboard FR- % FR- % FR- %

TRANSOM Port FR- % FR- % FR- %

Starboard FR- % FR- % FR- %

Signature (Ship’s Engineer):_______________________________________________________

Signature (Diving Supervisor):______________________________________________________

TABLE 4. DIVER HULL INSPECTION DATA

DIVER HULL INSPECTION DATA

VESSEL NAME: HULL TYPE / NUMBER LOCATION (CITY) DATE (mm/dd/yy)

PRODUCT LINE: INSPECTING ACTIVITY VISIBILITY (ft)

LOCATION OF LAST DRYDOCKING UNDOCKING DATE

LOCATION OF LAST PAINTING DATE

PAINT

TYPE: ANTIFOULING: ANTICORROSION:

DATE OF THE LAST WATERBORNE FULL HULL CLEANING DATE OF THE LAST WATERBORNE INTERIM CLEANING

UNDERWATER PHOTOGRAPHS TAKEN □ YES □ NO UNDERWATER COLOR VIDEO TAKEN □ YES □ NO

UNDERWATER WORK ACCOMPLISHED THIS DATE

□ FULL CLEAN □POLISH □MULTI-BRUSH □INSPECT □PAINT

□INTERIM □HYDRO □HAND-HELD □REPAIR □OTHER__________________________________

1. HULL COATING SYSTEM (PDR___________)

a. ANTIFOULING PAINT

PERCENTAGE REMAINING________________ PERCENT REJUVENATION________________

IS THE A/F □ HARD □ SOFT

PERCENTAGE __________ PEELING __________ LOCALIZED or __________ GENERAL

__________ BLISTERING __________ LOCALIZED or __________ GENERAL

__________ ABRASION __________ LOCALIZED or __________ GENERAL

CONDITION SUMMARY [ IF PAINT DAMAGE IS LOCALIZED, GIVE LOCATION(s) ]

b) ANTICORROSION PAINT

PERCENTAGE REMAINING _______________

PERCENTAGE __________ PEELING __________ LOCALIZED or __________ GENERAL

__________ BLISTERING __________ LOCALIZED or __________ GENERAL

__________ ABRASION __________ LOCALIZED or __________ GENERAL

c) DOCKING BLOCK AREAS (PDR _________)

AVERAGE PERCENTAGE OF BLOCK AREAS PAINTED ____________________ %

BARE METAL PITTING ____________________ % __________________ IN. DIAMETER ____________________ IN. DEEP

TABLE 5. DIVER HULL INSPECTION DATA (CONT.)

DIVER HULL INSPECTION DATA (CONTINUED)

2. CATHODIC PROTECTION SYSTEM

a. SACRIFICIAL ANODES (ZINCS)

AVERAGE PERCENTAGES OF ANODES REMANING ____________________ %

ANODES ARE: □ UNIFORMLY WASTED □ WASTAGE GREATEST IN FOLLOWING AREAS:

ANODES ARE : □ WELDED □ BOLTED □ BOTH

NUMBER AND LOCATION OF ANY ANODES MISSING OR INACTIVE:

MISSING___________________________________________________

INACTIVE__________________________________________________

b. IMPRESSED CURRENT

□ DAMAGE NOTED ON ATTACHED DRAWING (Port/Stbd) (FRAME ____________________ )

□ WIRES LOOSE, BROKEN, OR MISSING (Port/Stbd) (FRAME ____________________ )

□ CAPASTIC SHIELD DAMAGE (Port/Stbd) (FRAME ____________________ )

□ INSULATORS LOOSE OR DAMAGED (Port/Stbd) (FRAME ____________________ )

□ OTHER (Port/Stbd) (FRAME ____________________ )

3. GENERAL HULL DAMAGE (HULL PLATING, BILGE KEELS, etc.):

4. HULL PENETRATIONS (PDR _________)

_______________ % CLOGGED WITH MARINE GROWTH (POST CLEAN)

_______________ % BARE METAL (AREA SURROUNDING PENETRATION)

_______________ % BARE METAL PITTING

AVERAGE PIT SIZE: _______________ in. DIAMETER, _______________ in. DEPTH

CONDITION SUMMARY: ___________________________________________________

TABLE 6. DIVER HULL INSPECTION DATA (CONT.)

DIVER HULL INSPECTION DATA (CONTINUED)

5. SONAR DOME

□ NO VISIBLE DAMAGE □ DAMAGE NOTED ON ATTACHED DRAWING □ CUTS □ LAYER SEPARATION □ WIRE PILES EXPOSED

6. PROPULSION SHAFTING

VISIBLE BARE METAL □ YES □ NO RUST BLEEDING □ YES □ NO PITTING □ YES □ NO

CONDITION SUMMARY (TYPE OF DAMAGE, LOCATION AND SIZE):

7. STRUTS AND BEARING HOUSING

PERCENT BARE METAL: STARBOARD PORT

MAIN _________________________ % ___________________ %

INTERMEDIATE _________________________ % ___________________ %

PDR _________________________ ___________________

CONDITION OF STRUT LEADING AND TRAILING EDGES: ______________________________________

CONDITION OF ROPE GUARDS: __________________________________________________

CONDITION OF FAIRWATERS: ___________________________________________________

8. RUDDER

□ NO DAMAGE □ DAMAGE SHOWN ON ATTACHED DRAWINGS

STARBOARD PORT

PERCENT BARE METAL % %

PDR

ACCESS PLATES INTACT? □ YES □ NO □ YES □ NO

WAS RUDDER SOUNDED? □ YES □ NO □ YES □ NO

ANY SIGNS OF FLOODING? □ YES □ NO □ YES □ NO

ANY SIGNS OF DROPPING? □ YES □ NO □ YES □ NO

CONDITION SUMMARY:

9. PROPELLERS

□ NO DAMAGE □ DAMAGE SHOWN ON ATTACHED DRAWINGS

PROP #1: NICKS __________ CURLS __________ CRACKS – LARGEST CRACK LENGTH __________ in.

PROP #2: NICKS __________ CURLS __________ CRACKS – LARGEST CRACK LENGTH __________ in.

PROP #3: NICKS __________ CURLS __________ CRACKS – LARGEST CRACK LENGTH __________ in.

PROP #4: NICKS __________ CURLS __________ CRACKS – LARGEST CRACK LENGTH __________ in.

PROPELLERS NUMBERED STARBOARD TO PORT.

Diving Supervisor: ___________________________________________ Ship’s Engineer: _________________________________

FIGURE 1. PROPELLER INSPECTION DATA

FIGURE 2. STARBOARD RUNNING GEAR INSPECTION

FIGURE 3. PORT AND STARBOARD RUDDER INSPECTION