NOAA Standard Specification 997-1B Drydocking-Routine_Drydock-Work.pdf
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- MO FY27 Thomas Jefferson Drydock REFERENCES and ATTACHMENTS Federal contract opportunity
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This is a standard specification document for drydocking and routine drydock work on NOAA ships, effective August 2018, superseding the June 1989 version (MOC-997-1A).
The specification establishes comprehensive requirements for contractors performing drydocking services on NOAA vessels. Pre-drydocking submittals must include facility certifications from Naval Sea Systems Command (NAVSEA) per MIL-STD-1625D, International Association of Classification Societies (ICAS) members, or qualified independent engineering firms validating safe operating condition and capability to haul the intended ship. Additional required submittals include completed NOAA Drydocking Worksheets, dock master qualifications with resume, and detailed drydocking and undocking procedures addressing operating practices and site-specific precautions. General requirements mandate that ships be hauled within the first 25% of the contract performance period, protected against damage and fire throughout hauling and floating operations, and remain in drydock until all work is completed. Contractors must arrange keel blocks with minimum 36-inch height and 2-inch soft wood caps, install grounding cables before the keel clears water, and provide staging for thorough underwater body inspection. Within 12 hours of drydocking, the entire underwater hull, boot-topping, and appendages must be cleaned using stiff brushes, scrapers, and high-pressure fresh water while protecting transducers from damage. Within 48 hours, a joint inspection of the underwater hull by contractor, Contracting Officer's Representative (COR), and ship's commanding officer or master must assess hull condition, anodes, paint system, propellers, rudders, sea chests, shafts, and appendages. Additional requirements address transducer protection and painting using specific MIL-specifications, void inspections with rust preventive compound treatment per MIL-C-16173 Grade 5, packing renewal with TFE-impregnated square flax packing (graphite-free), and shaft run-out readings. The specification includes detailed procedures for undocking with leak checks and submission of marked-up docking plans documenting all alterations and modifications. Appendix A provides a 29-item drydocking checklist for guidance purposes, though contractors must comply with all specification requirements regardless of checklist completeness.
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997-1B August 2018
SUPERSEDING
MOC-997-1A
June 1989
STANDARD SPECIFICATION
DRYDOCKING AND ROUTINE DRYDOCK WORK
1. SCOPE
1.1 This specification contains the general requirements for drydocking and routine drydock work on NOAA ships.
2. REFERENCES
2.1 NOAA Docking Report, Form 2410.
2.2 NOAA Drydocking Worksheet.
3. DEFINITIONS
3.1 None.
4. REQUIREMENTS
4.1 Submittals
4.1.1 Prior to drydocking the ship, prepare and submit to the Contracting Officer’s Representative (COR):
a. A current certification issued by Naval Sea Systems Command (NAVSEA) in accordance with MIL-STD-1625D or member of the International Association of Classification Societies (ICAS) validating that the drydock or railway facility is in good operating condition.
1. If the facility does not have NAVSEA certification or classification by an ICAS member, then a certification prepared and signed by a qualified independent engineering firm, may be substituted. This certification must be based on a safety and condition inspection of the facility within the preceding 24 months, and must attest that the facility:
a) Is safe and in acceptable material condition.
b) Is capable of hauling the intended ship and that the ship does not exceed the drydock’s dimension rating, maximum entry draft, maximum lift capacity, and maximum linear load rating.
c) Has a successful historical record of drydocking ships, especially ships of similar or larger weight and dimensions. Has provided a record of the largest ship hauled during the previous 6 months.
d) Has provided an incident history and claim information covering the last five years from the insurer of the drydock facility including all incident dates, description, and final disposition.
e) Has a detailed procedure for hauling and floating.
f) Has effective emergency response systems and plans.
4.1.2 A completed copy of reference 2.2; Part B, Part D, and if applicable, Part C. A copy of reference 2.2 will be provided by the COR.
4.1.3 A letter certifying that the dock master in charge of the hauling and floating evolutions is professionally qualified, through training and experience, to conduct the evolutions in a safe and reliable manner. Attach a copy of the dock master’s resume to the letter.
4.1.4 A drydocking and undocking procedure which includes operating practices, and special precautions that are required due to the characteristics of the dock or ship, depth of water, and tide and current conditions which will exist.
4.2 General Requirements
4.2.1 Drydocking shall be in a facility that is certified by NAVSEA, an ICAS member, or a qualified independent engineering firm.
4.2.2 Haul the ship within the first 25% of the time allowed for the contract performance period.
4.2.3 Protect the ship against damage and fire during the entire hauling and floating procedure, and while the ship is out of the water.
4.2.4 Keep the ship in drydock until all work which requires drydocking has been completed, including all work included in the initial contract award and all additional work authorized or being negotiated.
4.2.5 If the Contractor desires to float the ship and subsequently re-haul the ship for completion of work, submit to the Contracting Officer a letter request which clearly outlines the reasons for the request. If the Contracting Officer decides to grant the request, the extent of the Government’s liability for costs related to the floating and re-hauling shall be limited to the additional lay day costs for which the Government would be liable if the ship were not floated and re-hauled.
4.2.6 Provide adequate staging, or other safe means acceptable to the COR, to accomplish all contract work and to permit a thorough inspection of the underwater body.
4.2.7 While the ship is in drydock, install temporary closures over all hull openings during hours outside the normal work shifts. Blank flanges and closure plates shall have sufficient strength to prevent water entry into the hull in the event of drydock failure or flooding.
4.2.8 Fit all hull discharge openings and scupper drains with discharge fittings, spigots and hoses to direct liquids away from the hull. Hull discharge openings which will not be in service while the ship is in drydock may be plugged in lieu of being fitted with the fittings, spigots and hoses. If the ship is docked in cold or freezing weather, drain all sea valves, pipes or similar fittings attached to the hull to prevent freezing and possible cracking.
4.3 Preparations for Drydocking
4.3.1 Arrange the blocks in the drydock or railway according to the ship’s docking plan.
4.3.2 Position the blocks to haul the ship in the position specified in the detail specification item. If the detail specification item does not specify a docking position, the COR shall specify the docking position.
4.3.3 The minimum height of the keel blocks shall be in accordance to the ship’s docking plan or the detail specification. If a conflict exists, the detail specification takes precedence. If not specified in the docking plan or detail specification, the minimum height shall be 36 inches.
4.3.4 All keel blocks must have 2 inches minimum soft wood caps.
4.3.5 Ensure that all transducers, domes, and other protuberances are clear of all blocks.
4.3.6 Ensure there are no obstructions between the floor surface of the drydock and the hull, hull openings, appendages, and fittings.
4.3.7 Provide ample horizontal and vertical clearance for removal and replacement of rudders, bow thrusters, fathometers, sea scanners, and sonar gear on the ship, whether or not such removals or replacement are known to be required.
4.4 Drydocking
4.4.1 Record the fore and aft draft mark readings port and starboard of the ship prior to drydocking.
4.4.2 After obtaining the consent of the COR, haul the ship without strain or injury in a drydock or marine railway. If any tendency to strain or injure the ship is observed, immediately refloat the ship and rearrange the blocks or make other corrections required to relieve the condition.
4.4.3 Prior to the keel clearing the water, attach two grounding cables from the ship’s hull to ground to protect against lightning or other static discharges. Connect one of the cables near the bow and the other cable near the stern. Each cable shall be a minimum size of 500,000 circular mils.
4.4.4 Immediately after the ship is in drydock, wash the dock basin down to remove silt, mud, and debris.
4.5 Drydocking Damage Inspection
4.5.1 Immediately after completing the drydock operations, conduct a joint inspection by the Contractor, the COR and the Commanding Officer/Master’s representative to ensure no damage occurred to the hull or appendages during the drydocking.
4.6 Cleaning
4.6.1 As soon as practical, but in all cases within 12 hours after drydocking the ship, clean the entire underwater hull and boot-topping of all marine growth, dirt and loose paint using stiff bristle brushes, scrapers, and high pressure fresh water.
a. Prior to high pressure wash, cover all transducer faces with a plywood cover to protect the transducers from damage.
b. Exercise extreme care to avoid scratching, gouging or otherwise damaging transducers, dome windows, shaft coverings, or other appendages.
c. Exercise care not to remove anti-fouling paint, especially during high pressure wash, unless detail specifications include work items that require repainting the underwater hull.
4.6.2 Clean sea strainer plates, sea chests, bow thrusters, rudders, anodes, propellers, shafts, struts, and other underwater hull appendages, as follows:
a. Fiberglass surfaces – clean with non-metallic scrapers and bristle brushes.
b. Anodes – clean with a wire brush to remove all corrosion products.
c. Propellers and bow thrusters – polish to bright metal.
4.6.3 Clean transducers as specified in paragraph 4.8 below.
4.7 Underwater Hull Inspection
4.7.1 Within 24 hours after drydocking the ship, remove all sea chest covers, strainer plates, rope guards, and fairwaters.
4.7.2 Within 48 hours after drydocking the ship, or as specified by the COR, conduct a joint inspection of the ship’s underwater hull by the Contractor, the COR, and the Commanding Officer/Master’s representative. The inspection shall include the following:
a. Condition of the hull, particularly inspecting for evidence of structural damage and deterioration of plating, welds, and fasteners.
b. Condition of anodes and paint system.
c. Condition of propellers, rudders, sea chests, shafts, overboard discharge piping, bilge keels, transducers, and all other underwater hull appendages. To enable inspection of the transducers, temporarily remove the protective plywood covers.
d. Inspect for evidence of leaks, damage, and deterioration.
4.7.3 A Condition Report of the inspection findings shall be submitted to the COR, including a completed preliminary copy of reference 2.1. A blank copy of reference 2.1 will be provided by the COR.
4.7.4 Reinstall the removed items after the inspection and acceptance of the Condition Report by the COR.
4.8 Transducers
4.8.1 Keep the transducer faces covered with a plywood protective cover except when work is being performed on the transducer.
4.8.2 Do not apply props or forced pressure on the face of the transducers.
4.8.3 Clean, protect, and paint the transducers as follows:
a. Clean the exposed surfaces of each transducer while the surfaces are damp. Use non-metallic, non-abrasive brushes. Do not use scrapers.
b. Rubber-Faced
1. Degrease the faces of rubber-faced transducers with mineral spirits and rinse with fresh water. Do not use detergents on the rubber faces.
2. Coat all rubber-faced transducers with two coats, 2.0 dry mils each, of MIL-P- 22298 Formula 133 and two coats, 2.0 dry mils each, of MIL-P-22299 Formula 134 in accordance with the paint manufacturer’s printed recommendations and instructions.
c. Metallic-Faced
1. Swab metallic-faced transducers with a solution of one part nitric acid to five parts fresh water, and follow with rich soapy water wash and fresh water rinse. Polish with crocus cloth.
2. Coat all metallic-faced transducers with one coat of anti-foulant same as prescribed for the remainder of the underwater hull. This is to be accomplished by removing the plywood protective covers immediately prior to applying the last coat of paint to the underwater hull. If the underwater hull is not being painted, apply one coat of anti-foulant same as exists on the underwater hull. All painting shall be in accordance with the paint manufacturer’s printed recommendations and instructions.
4.8.4 NOAA reserves the right to inspect and adjust transducers.
4.9 Void Inspections
4.9.1 If required in the detail specifications or other contract documents, remove the void plugs in underwater hull rub rails, rudders, struts, fairing plates, bilge keels, and voids that are inaccessible while afloat. As the plugs are removed, inspect for drainage of water from the voids. If water is present, advise the COR before proceeding.
4.9.2 After the source of water in the voids has been determined and all additional work authorized by the Contracting Officer has been completed, fill the voids with a rust preventive compound complying with MIL-C-16173, Grade 5. Drain the rust preventive compound and reinstall the plugs using an anti-seize compound on the threads.
4.10 Packing Renewal and Clearance Readings
4.10.1 If required in the detail specifications or other contract documents, remove the packing glands and packing from the rudders and tail shafts. Thoroughly clean the glands.
4.10.2 While the packing is removed, take and record the following readings:
a. Complete set of rudder stock and pintle bearing clearance readings.
b. Vertical movement of the rudders and wear-down of packing gland sleeves, as follows:
1. Raise the rudder approximately 1/8-inch to relieve weight from the thrust plates.
2. Disassemble the upper support bearing assembly for inspection.
3. Take clearance readings of the rudders at both the lower hull penetration and the internal upper bearing surfaces.
4. Measure wear-down of all packing gland sleeves.
5. After completion of inspections, reassemble all bearings.
c. Take clearance readings of each propulsion shaft cutlass bearing at 90-degree intervals around the shafts’ circumferences.
d. Take clearance readings of strut bearings at both the forward and aft sides of the struts.
e. Take wear-down readings of the shafts and sleeves at the packing gland.
f. Submit a Condition Report with the readings to the COR.
4.10.3 Cut and fit new rings of TFE-impregnated square flax packing in the rudder and tail shaft glands. Packing shall not contain graphite. Stagger the butts. The number of packing rings shall be as shown on applicable drawings if available. Otherwise, the number of packing rings shall be the same as removed.
4.10.4 Reinstall glands.
4.10.5 After the ship is floated, re-adjust the tail shaft glands such that a fine trickle of water provides cooling.
4.11 Run-out Readings
4.11.1 If required in the detail specifications or other contract documents, take run-out readings of the propeller shaft(s) in place while the packing is removed. If the propeller(s) is removed under another contract item, set up a dial indicator to bear on the after end of the shafts. If the propeller(s) is not removed, set the dial indicator to bear on another convenient machined surface as near the end of the shafts as practical.
a. Read and record the dial indicator deflections as the shaft(s) is rotated 360 degrees.
b. Set up a dial indicator and measure the shaft deflections at each strut and stern tube bearing while the shaft(s) is rotated 360 degrees.
4.11.2 Submit a Condition Report with the readings to the COR.
4.12 Undocking
4.12.1 Float the ship after all work requiring drydocking has been completed.
a. Flood the drydock or lower the railway until as many underwater openings as possible are covered with water, but without floating the ship off the blocks.
b. Provide adequate personnel and check for leaks. If leaks are found, re-dock the ship and repair the leaks. If no leaks are found or after repair of all leaks, continue undocking the ship.
4.12.2 After undocking, record the fore and aft draft mark readings port and starboard of the ship.
4.12.3 Submit to the COR a “marked-up” copy of the docking plan to show all alterations and modifications made to the underwater hull.
4.13 QUALITY ASSURANCE
4.13.1 After the blocks have been set and before lowering the drydock or railway for hauling the ship, a final inspection of the blocking shall be conducted by the COR and the dock master.
4.13.2 Recheck measurements as necessary to satisfy the COR that the block locations are in accordance with the docking plan and other contract requirements have been met.
4.13.3 Acceptance of the blocking arrangement by the COR in no way relieves the Contractor of the responsibility for safely drydocking the ship without strain or damage.
APPENDIX A
This Checklist is for guidance only. The Contractor is required to meet all requirements in the specification, whether or not they are captured accurately or fully in this checklist.
Drydocking Checklist Check Delivery Period Action Service
1 Prior to drydocking Submit Submit to COR, certification that drydocking facility is in good operating condition and can safely drydock the ship.
2 Prior to drydocking Submit Submit to COR, a completed copy of Reference 2.2, NOAA Drydocking Worksheet.
3 Prior to drydocking Submit Submit to COR, a letter certifying qualifications of dock master, including a copy of dock master’s resume.
4 Prior to drydocking Submit Submit to COR, drydocking and undocking procedure, including operating practices, and special precautions.
5 Within first 25% of repair period
Perform After getting consent from COR, haul the ship.
6 During haul, float, and drydock
Perform Protect ship against damage and fire.
7 Prior to haul, after blocks have been set
Inspect Ensure all protuberances are clear of blocks.
Ensure there are no obstructions between floor surface of drydock and the hull, hull openings, appendages, and fittings. Ensure there is ample horizontal and vertical clearance for removal and replacement of rudders, bow thrusters, fathometers, sea scanners, and sonar gear.
8 Prior to haul, after blocks have been set
Inspect Conduct a joint Pre-Docking Inspection with COR to ensure block locations are in accordance to docking plan and other contract requirements have been met.
9 Immediately prior to haul Perform Record fore and aft draft mark readings, port and starboard of the ship.
10 During haul, prior to keel clearing the water
Install Attach two grounding cables, bow and stern.
11 Immediately after drydocking
Perform Wash down the dock basin.
12 Immediately after drydocking
Inspect Conduct joint Drydocking Damage inspection with COR and Commanding Officer.
13 Before fresh water wash of underwater hull
Install Install protective plywood coverings over all transducers.
14 Within 12 hours after drydocking
Perform Clean underwater hull, boot-topping, sea strainers, sea chests, bow thrusters, rudders, anodes, propellers, shafts, struts, transducers, and other underwater hull appendages.
15 Within 24 hours after drydocking
Perform Remove all sea chests, strainer plates, rope guards, and fairwaters.
16 Within 48 hours after drydocking
Inspect Conduct joint Underwater Hull Inspection with COR and Commanding Officer.
17 After Underwater Hull Inspection
Install Reinstall all removed sea chests, strainer plates, rope guards, fairwaters, and transducer coverings.
18 Within 24 hours after Underwater Hull Inspection
Submit Submit to COR, a Condition Report, including a completed preliminary copy of reference 2.1, NOAA Docking Report, Form 2410.
19 During drydock Provide Provide staging to enable underwater body inspection and repairs.
20 During drydock Install Install fittings, spigots and hoses to all hull discharge openings and scupper drains. If docked in cold or freezing weather, drain all sea valves, pipes, or similar fittings to prevent cracking.
21 During drydock Perform Protect and paint transducers.
22 During drydock, outside normal work shift hours Install Install temporary closures over all hull openings to prevent water entry in the event of drydock failure.
23 During drydock Perform, if required
Inspect voids and treat with rust preventative compound.
24 During drydock Perform, if required
Take Packing Renewals and Clearance Readings and submit Condition Report to COR.
25 During drydock Perform, if required
Take Run-out Readings and submit Condition Report to COR.
26 After all work requiring drydock has been completed
Perform After approval of COR, float the ship.
27 During Float Operations, after underwater openings are covered with water, but before ship floats off blocks
Perform Check for leaks. If leaks are found, re-dock the ship and fix the leaks. If no leaks are found, then proceed with undocking the ship.
28 Immediately after undocking
Perform Record fore and aft draft mark readings, port and starboard of the ship.
29 After undocking Submit Submit to the COR a “marked-up” copy of the docking plan that shows all alterations and modifications made to the underwater hull.
| 1. SCOPE |
| 1.1 This specification contains the general requirements for drydocking and routine drydock work on NOAA ships. |
| 2. REFERENCES |
| 2.1 NOAA Docking Report, Form 2410. |
| 2.2 NOAA Drydocking Worksheet. |
| 3. DEFINITIONS |
| 3.1 None. |
| 4. REQUIREMENTS |
| 4.1 Submittals |
| 4.1.1 Prior to drydocking the ship, prepare and submit to the Contracting Officer’s Representative (COR): |
| a. A current certification issued by Naval Sea Systems Command (NAVSEA) in accordance with MIL-STD-1625D or member of the International Association of Classification Societies (ICAS) validating that the drydock or railway facility is in good operating... |
| 1. If the facility does not have NAVSEA certification or classification by an ICAS member, then a certification prepared and signed by a qualified independent engineering firm, may be substituted. This certification must be based on a safety and cond... |
| a) Is safe and in acceptable material condition. |
| b) Is capable of hauling the intended ship and that the ship does not exceed the drydock’s dimension rating, maximum entry draft, maximum lift capacity, and maximum linear load rating. |
| c) Has a successful historical record of drydocking ships, especially ships of similar or larger weight and dimensions. Has provided a record of the largest ship hauled during the previous 6 months. |
| d) Has provided an incident history and claim information covering the last five years from the insurer of the drydock facility including all incident dates, description, and final disposition. |
| e) Has a detailed procedure for hauling and floating. |
| f) Has effective emergency response systems and plans. |
| 4.1.2 A completed copy of reference 2.2; Part B, Part D, and if applicable, Part C. A copy of reference 2.2 will be provided by the COR. |
| 4.1.3 A letter certifying that the dock master in charge of the hauling and floating evolutions is professionally qualified, through training and experience, to conduct the evolutions in a safe and reliable manner. Attach a copy of the dock master’s ... |
| 4.1.4 A drydocking and undocking procedure which includes operating practices, and special precautions that are required due to the characteristics of the dock or ship, depth of water, and tide and current conditions which will exist. |
| 4.2 General Requirements |
| 4.2.1 Drydocking shall be in a facility that is certified by NAVSEA, an ICAS member, or a qualified independent engineering firm. |
| 4.2.2 Haul the ship within the first 25% of the time allowed for the contract performance period. |
| 4.2.3 Protect the ship against damage and fire during the entire hauling and floating procedure, and while the ship is out of the water. |
| 4.2.4 Keep the ship in drydock until all work which requires drydocking has been completed, including all work included in the initial contract award and all additional work authorized or being negotiated. |
| 4.2.5 If the Contractor desires to float the ship and subsequently re-haul the ship for completion of work, submit to the Contracting Officer a letter request which clearly outlines the reasons for the request. If the Contracting Officer decides to gr... |
| 4.2.6 Provide adequate staging, or other safe means acceptable to the COR, to accomplish all contract work and to permit a thorough inspection of the underwater body. |
| 4.2.7 While the ship is in drydock, install temporary closures over all hull openings during hours outside the normal work shifts. Blank flanges and closure plates shall have sufficient strength to prevent water entry into the hull in the event of dry... |
| 4.2.8 Fit all hull discharge openings and scupper drains with discharge fittings, spigots and hoses to direct liquids away from the hull. Hull discharge openings which will not be in service while the ship is in drydock may be plugged in lieu of being... |
| 4.3 Preparations for Drydocking |
| 4.3.1 Arrange the blocks in the drydock or railway according to the ship’s docking plan. |
| 4.3.2 Position the blocks to haul the ship in the position specified in the detail specification item. If the detail specification item does not specify a docking position, the COR shall specify the docking position. |
| 4.3.3 The minimum height of the keel blocks shall be in accordance to the ship’s docking plan or the detail specification. If a conflict exists, the detail specification takes precedence. If not specified in the docking plan or detail specification, t... |
| 4.3.4 All keel blocks must have 2 inches minimum soft wood caps. |
| 4.3.5 Ensure that all transducers, domes, and other protuberances are clear of all blocks. |
| 4.3.6 Ensure there are no obstructions between the floor surface of the drydock and the hull, hull openings, appendages, and fittings. |
| 4.3.7 Provide ample horizontal and vertical clearance for removal and replacement of rudders, bow thrusters, fathometers, sea scanners, and sonar gear on the ship, whether or not such removals or replacement are known to be required. |
| 4.4 Drydocking |
| 4.4.1 Record the fore and aft draft mark readings port and starboard of the ship prior to drydocking. |
| 4.4.2 After obtaining the consent of the COR, haul the ship without strain or injury in a drydock or marine railway. If any tendency to strain or injure the ship is observed, immediately refloat the ship and rearrange the blocks or make other correcti... |
| 4.4.3 Prior to the keel clearing the water, attach two grounding cables from the ship’s hull to ground to protect against lightning or other static discharges. Connect one of the cables near the bow and the other cable near the stern. Each cable shall... |
| 4.4.4 Immediately after the ship is in drydock, wash the dock basin down to remove silt, mud, and debris. |
| 4.5 Drydocking Damage Inspection |
| 4.5.1 Immediately after completing the drydock operations, conduct a joint inspection by the Contractor, the COR and the Commanding Officer/Master’s representative to ensure no damage occurred to the hull or appendages during the drydocking. |
| 4.6 Cleaning |
| 4.6.1 As soon as practical, but in all cases within 12 hours after drydocking the ship, clean the entire underwater hull and boot-topping of all marine growth, dirt and loose paint using stiff bristle brushes, scrapers, and high pressure fresh water. |
| a. Prior to high pressure wash, cover all transducer faces with a plywood cover to protect the transducers from damage. |
| b. Exercise extreme care to avoid scratching, gouging or otherwise damaging transducers, dome windows, shaft coverings, or other appendages. |
| c. Exercise care not to remove anti-fouling paint, especially during high pressure wash, unless detail specifications include work items that require repainting the underwater hull. |
| 4.6.2 Clean sea strainer plates, sea chests, bow thrusters, rudders, anodes, propellers, shafts, struts, and other underwater hull appendages, as follows: |
| a. Fiberglass surfaces – clean with non-metallic scrapers and bristle brushes. |
| b. Anodes – clean with a wire brush to remove all corrosion products. |
| c. Propellers and bow thrusters – polish to bright metal. |
| 4.6.3 Clean transducers as specified in paragraph 4.8 below. |
| 4.7 Underwater Hull Inspection |
| 4.7.1 Within 24 hours after drydocking the ship, remove all sea chest covers, strainer plates, rope guards, and fairwaters. |
| 4.7.2 Within 48 hours after drydocking the ship, or as specified by the COR, conduct a joint inspection of the ship’s underwater hull by the Contractor, the COR, and the Commanding Officer/Master’s representative. The inspection shall include the foll... |
| a. Condition of the hull, particularly inspecting for evidence of structural damage and deterioration of plating, welds, and fasteners. |
| b. Condition of anodes and paint system. |
| c. Condition of propellers, rudders, sea chests, shafts, overboard discharge piping, bilge keels, transducers, and all other underwater hull appendages. To enable inspection of the transducers, temporarily remove the protective plywood covers. |
| d. Inspect for evidence of leaks, damage, and deterioration. |
| 4.7.3 A Condition Report of the inspection findings shall be submitted to the COR, including a completed preliminary copy of reference 2.1. A blank copy of reference 2.1 will be provided by the COR. |
| 4.7.4 Reinstall the removed items after the inspection and acceptance of the Condition Report by the COR. |
| 4.8 Transducers |
| 4.8.1 Keep the transducer faces covered with a plywood protective cover except when work is being performed on the transducer. |
| 4.8.2 Do not apply props or forced pressure on the face of the transducers. |
| 4.8.3 Clean, protect, and paint the transducers as follows: |
| a. Clean the exposed surfaces of each transducer while the surfaces are damp. Use non-metallic, non-abrasive brushes. Do not use scrapers. |
| b. Rubber-Faced |
| 1. Degrease the faces of rubber-faced transducers with mineral spirits and rinse with fresh water. Do not use detergents on the rubber faces. |
| 2. Coat all rubber-faced transducers with two coats, 2.0 dry mils each, of MIL-P-22298 Formula 133 and two coats, 2.0 dry mils each, of MIL-P-22299 Formula 134 in accordance with the paint manufacturer’s printed recommendations and instructions. |
| c. Metallic-Faced |
| 1. Swab metallic-faced transducers with a solution of one part nitric acid to five parts fresh water, and follow with rich soapy water wash and fresh water rinse. Polish with crocus cloth. |
| 2. Coat all metallic-faced transducers with one coat of anti-foulant same as prescribed for the remainder of the underwater hull. This is to be accomplished by removing the plywood protective covers immediately prior to applying the last coat of paint... |
| 4.8.4 NOAA reserves the right to inspect and adjust transducers. |
| 4.9 Void Inspections |
| 4.9.1 If required in the detail specifications or other contract documents, remove the void plugs in underwater hull rub rails, rudders, struts, fairing plates, bilge keels, and voids that are inaccessible while afloat. As the plugs are removed, inspe... |
| 4.9.2 After the source of water in the voids has been determined and all additional work authorized by the Contracting Officer has been completed, fill the voids with a rust preventive compound complying with MIL-C-16173, Grade 5. Drain the rust preve... |
| 4.10 Packing Renewal and Clearance Readings |
| 4.10.1 If required in the detail specifications or other contract documents, remove the packing glands and packing from the rudders and tail shafts. Thoroughly clean the glands. |
| 4.10.2 While the packing is removed, take and record the following readings: |
| a. Complete set of rudder stock and pintle bearing clearance readings. |
| b. Vertical movement of the rudders and wear-down of packing gland sleeves, as follows: |
| 1. Raise the rudder approximately 1/8-inch to relieve weight from the thrust plates. |
| 2. Disassemble the upper support bearing assembly for inspection. |
| 3. Take clearance readings of the rudders at both the lower hull penetration and the internal upper bearing surfaces. |
| 4. Measure wear-down of all packing gland sleeves. |
| 5. After completion of inspections, reassemble all bearings. |
| c. Take clearance readings of each propulsion shaft cutlass bearing at 90-degree intervals around the shafts’ circumferences. |
| d. Take clearance readings of strut bearings at both the forward and aft sides of the struts. |
| e. Take wear-down readings of the shafts and sleeves at the packing gland. |
| f. Submit a Condition Report with the readings to the COR. |
| 4.10.3 Cut and fit new rings of TFE-impregnated square flax packing in the rudder and tail shaft glands. Packing shall not contain graphite. Stagger the butts. The number of packing rings shall be as shown on applicable drawings if available. Otherwi... |
| 4.10.4 Reinstall glands. |
| 4.10.5 After the ship is floated, re-adjust the tail shaft glands such that a fine trickle of water provides cooling. |
| 4.11 Run-out Readings |
| 4.11.1 If required in the detail specifications or other contract documents, take run-out readings of the propeller shaft(s) in place while the packing is removed. If the propeller(s) is removed under another contract item, set up a dial indicator to ... |
| a. Read and record the dial indicator deflections as the shaft(s) is rotated 360 degrees. |
| b. Set up a dial indicator and measure the shaft deflections at each strut and stern tube bearing while the shaft(s) is rotated 360 degrees. |
| 4.11.2 Submit a Condition Report with the readings to the COR. |
| 4.12 Undocking |
| 4.12.1 Float the ship after all work requiring drydocking has been completed. |
| a. Flood the drydock or lower the railway until as many underwater openings as possible are covered with water, but without floating the ship off the blocks. |
| b. Provide adequate personnel and check for leaks. If leaks are found, re-dock the ship and repair the leaks. If no leaks are found or after repair of all leaks, continue undocking the ship. |
| 4.12.2 After undocking, record the fore and aft draft mark readings port and starboard of the ship. |
| 4.12.3 Submit to the COR a “marked-up” copy of the docking plan to show all alterations and modifications made to the underwater hull. |
| 4.13 QUALITY ASSURANCE |
| 4.13.1 After the blocks have been set and before lowering the drydock or railway for hauling the ship, a final inspection of the blocking shall be conducted by the COR and the dock master. |
| 4.13.2 Recheck measurements as necessary to satisfy the COR that the block locations are in accordance with the docking plan and other contract requirements have been met. |
| 4.13.3 Acceptance of the blocking arrangement by the COR in no way relieves the Contractor of the responsibility for safely drydocking the ship without strain or damage. |
| 4.14 |
| APPENDIX A |
| This Checklist is for guidance only. The Contractor is required to meet all requirements in the specification, whether or not they are captured accurately or fully in this checklist. |
File details come from the government source that posted it. Updated .