REV-2 December 29 2009.pdf

USCGC SHAMAL (WPC-13)

179 FOOT A CLASS PATROL CRAFT

SPECIFICATION FOR DRYDOCK REPAIRS

Developed By:

LT J. A. Drzewiecki

LTjg D. N. Kahn Mr. J. Gutknecht MKCS J. Dosset

Commander (v)

Maintenance and Logistics Command, Atlantic

300 E. Main Street, Suite (600) Norfolk, VA 23510-9102

(December 29, 2009 / Rev-2)

USCGC SHAMAL (WPC-13) DRYDOCK AVAILABILITY 2010

TABLE OF CONTENTS

Work Item Title Page

List of Sketches iii

Revisions Record iv

List of Applicable References v

List of Government-furnished Property ix

List of Critical Inspection Items x

Specification Feedback xi

Principal Characteristics xii

General Requirements 1

1 Perform Ultrasonic Thickness Measurements 9

2 Clean and Inspect Fuel Service Tanks 11

3 Remove, Inspect, and Reinstall Propeller Shafts 14

4 Renew Shaft Bearings 21

5 Remove, Inspect, and Reinstall Propellers 25

6 Repair Propeller Root Erosion 28

7 Remove, Inspect, and Reinstall Rudder Assemblies 31

8 Routine Drydocking 39

9 Provide Temporary Logistics 43

10 Renew Stern Tubes 1 & 4 46

11 Renew Stern Tubes 2 & 3 51

12 Preserve Underwater Body in Block Lifting Area 2 - "100%" 56

13 Preserve Aft Steering Compartment 58

Page i (Rev-2)

14 Perform Steel Hull and Structural Plating Repairs (5.1mm) 60

15 Perform Steel Hull and Structural Plating Repairs (6.4mm) 62

16 Perform Steel Hull and Structural Plating Repairs (4.6mm) 64

17 Perform Hull and Structural Plating Repairs - Corrugated Plate (4.0-Pound) 66

Page ii (Rev-2)

List of Sketches

Work Item Sketch Number Page

7 MLCA SKETCH 56200_179 WPC-SK1 35

7 MLCA SKETCH 56200_179 WPC-SK2 36

Page iii (Rev-2)

Revisions Record

This page is used to record specification revisions, which may have occurred subsequent to a Revision 0 (Rev-0) package.

Information listed is intended to provide contractors and field unit personnel a means to ensure all the current specification revision pages are present when reviewing or utilizing this specification package.

DATE REV# WORK ITEM# CHANGES MADE

16DEC09 1 10, 11 Changed Drawing 115-5197004 to 115-5107004 29DEC09 2 14,15,16,17 Added Optional WIs 14,15,16,17 29DEC09 2 4 Changed paragraph 1.1 from 16 bearings to

29DEC09 2 5 Changed Drawing 245-5106760 to 245-6736985

NOTE: All work item and paragraph numbers listed above for a given revision correspond to same numbers in the previous revision. This revised specification is self-contained with all of the above listed changes incorporated.

Page iv (Rev-2)

List of Applicable References

The below-listed documents form a part of this specification to the extent specified herein. Approval/publication dates or revision dates/numbers are also identified, to ensure that same document versions are used at time of specification writing and during contract execution. Electronic copies of the latest Editions of MLCA Standard Specifications are available on the Internet and may be accessed at the following Internet Uniform Resource Locator (URL) address:

http://www.uscg.mil/mlclant/vdiv/standard_specifications.asp.

Guidance for obtaining copies of all other documents referenced herein is provided in the solicitation.

Order of precedence. In the event of conflicts between text of this specification and the applicable references specified herein, order of precedence shall be in accordance with MLCA Standard Specification 0000_STD, paragraph 3.2 (Order of precedence), unless otherwise specified by the Contracting Officer (KO). The Contractor shall immediately notify the KO in writing of any perceived conflicts contained herein. Nothing in these documents, however, supersedes applicable laws and regulations, unless a specific exemption has been obtained.

FEDERAL AND MILITARY SPECIFICATIONS AND STANDARDS

Coast Guard Maintenance and Logistics Command Atlantic (MLCA), Standard Specification 0000_STD, 2006 Edition, General Requirements

Coast Guard Maintenance and Logistics Command Atlantic (MLCA), Standard Specification 0740_STD, 2004 Edition, Welding and Allied Processes

Coast Guard Maintenance and Logistics Command Atlantic (MLCA), Standard Specification 1001_STD, 2004 Edition, Temporary Hull Accesses

Coast Guard Maintenance and Logistics Command Atlantic (MLCA), Standard Specification 8634_STD, 2004 Edition, Drydocking

Coast Guard Maintenance and Logistics Command Atlantic (MLCA), Standard Specification 8635_STD, 2004 Edition, Provide Temporary Logistics

MIL-S-22698, 1994, Steel Plate, Shapes and Bars, Weldable Ordinary Strength and Higher Strength: Structural

Page v (Rev-2) http://www.uscg.mil/mlclant/vdiv/standard_specifications.asp

DOCUMENTS

Bollinger Shipyard Lockport (BSL) Document 6B233C405, Aug 1993, Rev F, Propulsion Alignment Final Check

DRAWINGS

NAVSEA Drawing 085-7292420, Rev B, Docking Plan with Hull Extension

NAVSEA Drawing 111-5107003, Rev C, Stern Extension External Structure

NAVSEA Drawing 111-6736914, Rev M, Shell Expansion

NAVSEA Drawing 113-6736917, Rev M, Innerbottom Plating

NAVSEA Drawing 115-5107004, Rev B, Stern Extension Internal Structure

NAVSEA Drawing 115-6736918, Rev K, Long Girders and Bulkheads

NAVSEA Drawing 123-7086610, Rev A, Cofferdams Incdtl Fuel Tank Installation

NAVSEA Drawing 161-6736936, Rev D, Stern Tube Installation Details

NAVSEA Drawing 161-6736938, Rev F, Main Strut Details

NAVSEA Drawing 161-6736939, Rev F, Intermediate Shaft Strut Details

NAVSEA Drawing 161-6736941, Rev H, Main Shaft Strut Installation

NAVSEA Drawing 161-6736942, Rev H, Intermediate Shaft Strut Installation

NAVSEA Drawing 201-6736981, Rev D, Propulsion Configuration

NAVSEA Drawing 241- 5106756, Rev A, Main Eng Reduction Gearbox Chocking and Bolting Arr

NAVSEA Drawing 243-5107134, Rev-, Propeller, Gearbox, and Muff Coupling Installation/Removal

NAVSEA Drawing 243-6736967, Rev K, Shafting Details

NAVSEA Drawing 243-6736967, Rev L, Shafting Details

Page vi (Rev-2)

NAVSEA Drawing 243-6736968, Rev D, Hydraulic Nut and Oil Injection Equipment for Propulsion Shafting Installation

NAVSEA Drawing 243-6736983, Rev D, Shaft Locking Arrangement

NAVSEA Drawing 243-8273884, Rev A, Propulsion Shaft Stuffing Boxes Replace with Mechanical Seals

NAVSEA Drawing 245-6736985, Rev B, Propeller Details

NAVSEA Drawing 561-6737054, Rev F, Steering Arrangement and Details

NAVSEA Drawing 562-6737055, Rev J, Rudder Details

Deep Sea Seals Ltd Drawing H76262-01, Rev 1, GA of 115MM (4.527”) Fully Split FSE Seal

PUBLICATIONS

Coast Guard Commandant Instruction (COMDTINST) M10360.3 (series), Jun 2006, Coatings and Color Manual

Deep Sea Seals Ltd Technical Publication (TP) TM-FSE-66248, March 2006, Technical Manual for Type FSE Seal U.S. Navy PC's

NAVSEA Technical Publication (TP) S9561-CV-MMA-010, Sep 1999, Change A, Technical Manual for Steering System Model 900HS

INDUSTRY STANDARDS

American Society of Mechanical Engineers (ASME) B46.1, 2002, Surface Texture (Surface Roughness, Waviness, and Lay)

American Welding Society (AWS) C5.6, Reapproved 1994, Recommended Practices for Gas Metal Arc Welding

Society of Automotive Engineers (SAE) Aerospace Material Specification (AMS) C6183, 2007, Cork and Rubber Composition Sheet; For Aromatic Fuel And Oil Resistant Gaskets

The Society for Protective Coatings (SSPC) Surface Preparation Specification No.3 (SSPC-SP 3), 2004, Power Tool Cleaning

The Society for Protective Coatings (SSPC)/NACE International (NACE) Joint Surface Preparation Standard SSPC-SP 10/NACE No.2, 2004, Near-White Blast Cleaning

Page vii (Rev-2)

ASTM International (ASTM) D5363, 2003, Standard Specification for Anaerobic Single Component Adhesives

ASTM International (ASTM) E797, 2005, Standard Practice for Measuring Thickness by Manual Ultrasonic Pulse-Echo Contact Method

ASTM International (ASTM) A572, 2006, Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel

Page viii (Rev-2)

List of Government-furnished Property

The following is a list of property, which the Government will furnish. This list supersedes any other material obligations indicated or implied by referenced drawings.

WORK

ITEM MTI ITEM DESCRIPTION NSN/PN QTY

ESTIMATED

COST

($/UNIT)

3 Y Inboard Shaft NSN: 2010-01-398-5361 2 ea. 20,665.00 3 Y Outboard Shaft NSN: 2010-01-398-5363 4 ea. 23,054.00

3 Y *Oil Injection Equipment Kit N/A 1 kit 1,500.00

3 N **Muff Coupling PN: SKF USA OKCE 115SS/176141 2 ea. 19,630.80

3 N FSE Service Kit 115MM PN: H76262-01-5 4 ea. 4160.06

3 N Inflatable Seal For 115 FSE PN: H76262-01-3-5 4 ea. 746.60

N Main Shaft Strut Bearing, Bronze and rubber cutlass bearing, 4" ID x 5" OD x 16" Long

Duramax Marine #861154134-1

4 ea. 1,208.00

N Intermediate Shaft Strut Bearing, Bronze and rubber cutlass bearing, 4" ID x 5" OD x 16" Long

Duramax Marine #871154100

4 ea. 437.24

N Stern Tube Bearing, Bronze and Rubber cutlass bearing, 4" ID x 5" OD x 8" Long

Duramax Marine #861154137-1

4 ea. 1290.00

4 N Pedestal Bearing Duramax Marine #871154134

2 ea. 560.00

5 Y **Propeller, Right Hand

NSN: 2010-01-431-4203 2 ea. 13,052.00

5 Y **Propeller, Left Hand

NSN: 2010-01-431-4199 2 ea. 13,052.00

5 Y *Hydraulic Removal Assembly

N/A 1 ea. 2,500.00

8 N *Transducer cover plate N/A 5 ea. 300.00

*Government-loaned property, which shall be returned to the vessel upon completion of the availability.

**New or refurbished equipment that the Government may provide for installation in place of existing equipment.

***Government-furnished property, which is to be supplied by either the vessel, Electronic Systems Support Unit (ESU) or local Electronic Support Detachment (ESD).

Page ix (Rev-2)

List of Critical Inspection Items

The following is a list of work items, which contain Critical Inspection reports, which the Contractor must complete within the first 25% of the availability contract period (see Std Spec 0000_STD, paragraph 3.6.2 (Inspection report particulars)):

Work Item Title

3 Remove, Inspect, and Reinstall Propeller Shafts

7 Remove, Inspect, and Reinstall Rudder Assemblies

12 Preserve Underwater Body in Block Lifting Area 2 - "100%"

Page x (Rev-2)

Specification Feedback

The intent of this section is to inform all users that a spec feedback mechanism is in place, and is located on the MLCA Naval Engineering Division’s website. Spec feedback is a very important part of our overall continuous improvement process, and is crucial to specification development. It will allow spec writers to capture all specification-related lessons learned, and avoid mistakes or ambiguities in follow-on availabilities.

All feedback will be reviewed, evaluated, and responded to in a timely manner.

If you have access to the CGWeb (Intranet), please use the following link, which will connect you to the MLCA(v) Naval Engineering website, for submitting your feedbacks:

http://webapps.mlca.uscg.mil/vdiv/specifications/feedback/defaul t.cfm

If you do not have access to the CGWeb (Intranet), you may still submit your feedbacks, using the following web link:

http://www.uscg.mil/mlclant/vdiv/specfeedback.asp

Page xi (Rev-2) http://webapps.mlca.uscg.mil/vdiv/specifications/feedback/default.cfm http://webapps.mlca.uscg.mil/vdiv/specifications/feedback/default.cfm http://www.uscg.mil/mlclant/vdiv/specfeedback.asp

Page xii (Rev-2)

PC_179_WPC

(08 Feb 2007)

Principal Characteristics

179' WPC COASTAL PATROL BOAT

Length Overall 178' 4-3/16"

Depth (main deck at side to baseline) 13' 5-3/8"

Maximum Beam 25'

Height of Highest Projection (above DWL) 61'

Frame Spacing FR 1-29: 2' 9-7/16"

FR 29-43: 3' 7-1/4"

FR 43-53: 2' 9-3/8"

Full Load Draft 8.68'

Full Load Displacement 383 long tons

Shore Tie Voltage Requirements 460 vac, 400A, 3 phase cables

Shore Tie Phone Requirements Russel-Stoll type SKW

PROPELLERS / SHAFT

Number of Propellers 4 (2 RH, 2 LH)

Number of Blades per Propeller 6

Diameter of Propeller 4' 2-3/8"

Pitch Fixed (1.465 at 0./0 R/Ro)

Revolutions per Minute (RPM) 773

Shaft Diameter 4.5" at exit of hull

00000_DLA_179 WPC (23Oct 2008)

General Requirements

1. SCOPE

1.1 Intent. This item describes the general requirements to be followed by the Contractor while conducting this availability.

1.2 Government-furnished property.

None.

2. APPLICABLE DOCUMENTS

Coast Guard Maintenance and Logistics Command Atlantic (MLCA), Standard Specification 0000_STD, 2006 Edition, General Requirements

Coast Guard Maintenance and Logistics Command Atlantic (MLCA) Standard Specification 0740_STD, 2004 Edition, Welding and Allied Processes

Coast Guard Commandant Instruction (COMDTINST) M10360.3 (series), Jun 2006, Coatings and Color Manual

3. REQUIREMENTS

3.1 General. The Contractor shall conform to all requirements specified in Std Spec 0000_STD and in this item, as applicable, during the performance of this availability.

NOTE

The requirements of paragraph 3.1 (General) applies to all work under the scope of this contract, whether explicitly stated in work items or not, and also to all other work subsequently authorized by changes, modifications, or extensions to the contract.

3.2 Contractor-provided fire watch personnel. The Contractor

shall provide fire watch personnel and equipment.

3.3 Welding and brazing requirements. The Contractor shall

perform all welding and allied processes, and nondestructive inspection (NDI), in accordance with Std Spec 0740_STD.

Page 1 (Rev-1)

3.4 Changes to Std Spec 0000_STD. The Contractor shall be

aware of the following changes to Std Spec 0000_STD:

3.4.1 Temporary sanitary and sewage facilities. Replace

paragraph 3.8.2 (Sewage facilities - disruption of sewage system) with the following:

3.8.2 Sewage facilities - disruption of sewage system.

When the shipboard toilets are unavailable due to contract work, and no permanent shore side facilities are available, the Contractor shall provide three portable toilets.

Ensure that the toilets are:

• Located as close as possible to the vessel, at a distance not to exceed 100 yards.

• Cleaned and emptied daily, and restocked with consumables.

3.5 Term substitution - COTR for COR. The Contractor shall be aware that the term "COR" (Contracting Officer's Representative) has been discontinued in favor of "COTR" (Contracting Officer's Technical Representative); consequently, whenever "COR" is encountered in this specification package, including referenced standard specifications and other referenced documents, it shall refer to "COTR", explicitly.

3.6 Small boat storage. When a small boat (Motor Surf Boat

(MSB)/Motor Cargo Boat (MCB)/Rigid Hull Inflatable (RHI) boat) is removed as interference to Contractor-work, the Contractor shall provide a suitable pier side storage cradle, for safely storing said boat.

3.6.1 Cradle design. Ensure that the temporary cradle meets

the following criteria:

• Structure is templated from the geometry and arrangement of the contact support areas of the existing cradle onboard the vessel, to provide same or more support area as that which is provided by the existing cradle.

• Arrangement will allow ship's force to perform maintenance on the small boat, without modification of the cradle.

• Structure is manufactured using the most economical methods and materials available, and is capable of supporting the full weight of the small boat under normal conditions experienced during routine maintenance.

Page 2 (Rev-1)

• Contact surfaces are no harder or rougher than the contact surfaces for existing cradle onboard the vessel.

3.6.2 Boat accessibility. Ensure the storage is located in the vicinity of the vessel, and is unrestricted, to allow for ship's force to complete maintenance during normal working hours for the entire performance period.

3.6.3 Boat protection. Provide full protection that can be

safely and completely secured when the small boat is left unattended (e.g. watertight cover, storage in a warehouse or shop, etc.), in addition to isolating the boat from the elements.

3.6.4 Boat transportation. Transport each small boat to its

storage area within one week of docking the vessel and back to the vessel prior to the end of the performance period.

4. NOTES

4.1 Access to COMDTINST M10360.3. The COMDTINST M10360.3 may

be accessed at the following URL address:

http://www.uscg.mil/directives/cim.asp

4.2 QA inspection forms. QA inspection forms (QA-1 thru QA-5), required in Std Spec 0000_STD to be completed and submitted during preservation of "critical-coated surfaces", are provided at the end of this item.

Page 3 (Rev-1) http://www.uscg.mil/directives/cim.asp

QA-1: QUALITY ASSURANCE INSPECTION FORM - PRESERVATION CHECKLIST

CHECKPOINT 1 - COATING SYSTEM COMPLIANCE

Ensure all coatings are in compliance with COMDTINST M10360.3, Appendix C.

CHECKPOINT 2 - PAINT STORAGE

Ensure all coatings are kept at a temperature of 65 to 85°F at all times, unless otherwise specified by the coating manufacturer(s).

CHECKPOINT 3 - AMBIENT CONDITIONS

Ensure surface and surrounding temperatures are each between 50 and 90°F for water-based coatings, and 35 and 95°F for other coatings, unless otherwise specified by the coating manufacturer(s).

Ensure maximum relative humidity (RH) is as follows, from surface preparations through final curing of topcoat: 50% for tanks, voids, and vent plenum; and 85% for all other areas, unless otherwise specified by manufacturer(s).

Ensure surface temperature is at least 5°F above the dew point, unless otherwise specified by the coating manufacturer(s).

CHECKPOINT 4 - PRE-SURFACE PREPARATION

Remove surface contaminants (soluble salts, loose rust, mud, and marine growth) with low pressure fresh water wash down (maximum 5,000 psi). If oil and grease are present, perform solvent cleaning, as per SSPC SP-1.

CHECKPOINT 5 - SURFACE PREPARATION

Verify environmental conditions (see CHECKPOINT 3).

Ensure cleanliness of prepared surface is as per specification (i.e.: SSPC SP-12, SP-11, SP-10?).

Verify surface anchor profile (1.5-3.5 mils for abrasive-blasted steel surfaces; 1.0 mil (minimum) for power-tool cleaned surfaces; 1.0-1.5 mils for abrasive-blasted aluminum surfaces); and 1.5 -2.5 for surfaces to be coated w/single coat of inorganic zinc).

Measure soluble salt conductivity (5 measurements per 1000 sqft) - maximum threshold: 70 microsiemens/cm for non-submerged surfaces and 30 microsiemens/cm for submerged surfaces.

CHECKPOINT 6 - PRIMER COAT APPLICATION

Verify environmental conditions (see CHECKPOINT 3).

Verify proper mixing and stand-in (induction) times.

Ensure no paint is applied when the temperature is expected to drop to freezing before the paint has dried.

Ensure surfaces are completely dry, unless otherwise allowed by the Coating Manufacturer(s).

Verify wet film thickness at random, to prevent under or over application.

Brush out all runs, sags, drips, and puddles.

Perform visual inspection for holidays and other defects.

CHECKPOINT 7 - STRIPE COAT APPLICATION

Verify environmental conditions (see CHECKPOINT 3).

Ensure overcoating window is as per manufacturer's instructions.

After primer coat (mist coat after inorganic zinc), brush-apply un-thinned coat of same primer paint over edges, weld seams, cut-outs, and areas of complex geometries @ 3-4 mils wet film thickness (WFT).

CHECKPOINT 8 - TOP COAT APPLICATION

Verify environmental conditions (see CHECKPOINT 3).

Ensure overcoating window is as per manufacturer's instructions.

Verify proper mixing and stand-in (induction) times, as applicable.

Verify wet film thickness at random, to prevent under or over application.

Brush out all runs, sags, drips, and puddles.

CHECKPOINT 9 - FINAL INSPECTION

Verify final system dry film thickness.

Verify system cure for service resumption - U/W Body surfaces: 5-8 hours @ 77 degrees F; Potable water tanks: 7 days @

77 degrees F.

Ensure potable water tank exhaust ventilation is maintained continuously from and during coating application through final system cure (minimum 7 days @ 77 degrees F.), to exhaust all solvent to the atmosphere and to prevent solvent entrapment.

CHECKPOINT 10 - RECORD KEEPING

Complete, sign, and submit all provided QA Inspection Forms.

Signature of Inspector:______________________________________________________Date:____________

Page 4 (Rev-1)

QA-2. QUALITY ASSURANCE INSPECTION FORM

ENVIRONMENTAL READINGS

(Use one sheet for each activity. Record conditions every four hours from before surface preparation to application of final coating system coat)

DATE TIME

ENTER ACTIVITY

(Surface preparation, primer coat, barrier coat, top coat, etc?)

LOCATION DEW

POINT

SURFACE

TEMP.

% REL.

HUMIDITY

SIGNATURE

OF

INSPECTOR

.Signature of Inspector:__________________________________________________Date:____________

Page 5 (Rev-1)

QA-3 QUALITY ASSURANCE INSPECTION FORM

SURFACE PROFILE LOG

Vessel Name And Hull Number:__________________________________________________

Work Item Title:_______________________________________________________________

Location Of Work (Including Frame Numbers):_____________________________________

Area (Square Feet):_____________

Surface Preparation Method:_____________________________________________________

Abrasive Manufacturer And Size:_________________________________________________

Degreasing Method Used:________________________________________________________

Number Of Hours Surfaces (Steel Only) Left Unpainted:______________________________

Sweep blasting performed to remove flash rusting (steel)? Yes/No:_____________________

Place Surface Profile Replica Tapes In The Spaces Provided Below, To Serve As Permanent QA record.

Maintain separate log for each area/location. When an Area Is Divided Into Separate Sections, Maintain A Separate Log for Each Section.

AVERAGE MILS

(IAW ASTM D4417,

METHOD C)

• Place Surface Profile Replica Tape Here

Reading:__________ mils

• Place Surface Profile Replica Tape Here

Date and Time:__________________________________________________

Location of Surface Profile Measurements:___________________________________________________________

Signature of Inspector:____________________________________________________________________________

Page 6 (Rev-1)

QA-4. QUALITY ASSURANCE INSPECTION FORM

SURFACE SOLUBLE SALT CONDUCTIVITY LOG

Vessel Name and Hull Number:__________________________________________________

Work Item Title:_______________________________________________________________

Location of Work (including frame numbers):_______________________________________

Area (square feet):____________

DATE TEST LOCATIONS CONDUCTIVITY

(microsiemens/cm)

Date and Time:_________________________________________

Signature of Inspector:___________________________________

Page 7 (Rev-1)

QA-5. QUALITY ASSURANCE DATA FORM

DRY FILM THICKNESS (DFT) MEASUREMENTS IAW SSPC PA-2

(Use one sheet for each sequence)

Vessel Name and Hull Number:__________________________________________________

Work Item Title:______________________________________________________________

Coating Manufacturer:_________________________________________________________

Product Name:________________________________________________________________

Batch Number:________________________________________________________________

Induction Time:_______________________________________________________________

Coating System Sequence (Indicate whether: primer, touch-up primer, barrier coat, 3rd coat?):__________________

DFT

MEASUREMENT

NUMBER

LOCATION OF READINGS MEASURED DFT

Application Method (Airless, Conventional Spray, Rolled):____________________

Average DFT: __________________________________________________________

Date and Time: _________________________________________________________

Signature of Inspector: ___________________________________

Page 8 (Rev-1)

11001_TEF_FLT (03 Dec 2008)

WORK ITEM 1: Perform Ultrasonic Thickness Measurements

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to perform thickness measurements of freeboard hull plating, by ultrasonic methods.

1.2 Government-furnished property.

None.

2. APPLICABLE DOCUMENTS

ASTM International (ASTM) E797, 2005, Standard Practice for Measuring Thickness by Manual Ultrasonic Pulse-Echo Contact Method

3. REQUIREMENTS

3.1 Ultrasonic thickness measurement. The Contractor shall

perform a total of 500 thickness measurements of hull plating, bulkhead plating, and/or structural members, in locations designated by the Coast Guard Inspector. Submit a CFR. The ultrasonic apparatus, procedure requirements, and report shall be in accordance with ASTM E797. The report results shall additionally include, for each test point:

• Location.

• Original metal thickness.

• Measured metal thickness.

• Percent deterioration (calculation is based on the original metal thickness).

3.2 Apparatus Standardization. The Contractor shall perform

ultrasonic equipment standardization in accordance with ASTM E797, Section 7 (Standardization of Apparatus) and Section 8 (Technical Hazards).

Page 9 (Rev-1)

4. NOTES

This section is not applicable to this work item.

Page 10 (Rev-1)

12312_DLA_FLT (10 Sept 2008) 179 WPC (21 Mar 2008)

WORK ITEM 2: Clean and Inspect Fuel Service Tanks

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to clean and inspect the following tank(s):

TYPE OF TANK LOCATION CAPACITY

(GALLONS)

Diesel Service 3-20-1-F 4,700 Diesel Service 3-20-2-F 4,700 Diesel Service 3-43-0-F 4,692 Diesel Service 3-43-1-F 2,351 Diesel Service 3-43-2-F 2,433

1.2 Government-furnished property.

None.

2. APPLICABLE DOCUMENTS

Society of Automotive Engineers (SAE) Aerospace Material Specification (AMS) C6183, 2007, Cork and Rubber Composition Sheet; For Aromatic Fuel And Oil Resistant Gaskets

3. REQUIREMENTS

3.1 General.

3.1.1 Operational test - initial. Prior to commencement of

work, the Contractor shall witness an operational pre-test (by Coast Guard personnel) of all designated tank TLIs to demonstrate existing operational condition. Submit a CFR.

3.1.2 Tank content removal. The Contractor shall remove and

dispose of up to a total of 5,000 gallons of diesel fuel.

NOTE

Vessel may come in with less tank fluid contents than specified above.

Page 11 (Rev-1)

3.2 Cleaning requirements. The Contractor shall remove tank

cover(s) and clean tank interior surfaces free of all foreign materials, such as sediment or sludge, taking care not to damage the coating system (if applicable). Remove cleaning media and residues continuously during the washing process. Remove any residual wash media; and wipe up residual moisture with clean lint-free cloths.

3.3 Tank content and waste disposal. The Contractor shall

dispose of tank contents and all cleaning fluids in compliance with all applicable Federal, state, and local laws, ordinances and regulations. Document a complete chain of custody record of the removed tank contents and generated wastes, from the vessel to the point of final destination or delivery. Submit document to the COTR upon completion of work.

3.4 Inspection. The Contractor shall visually inspect all tank interior surfaces, including, but not limited to bulkheads, floor and overhead plating, structural members, manhole cover surfaces, fasteners and gasket seating surfaces. Submit a CFR including the following, as applicable:

• Tank structural condition.

• Inaccessible areas.

• Condition of tank coating, including measurements taken, percentage, location, and type of coating failure.

• Tank level indicator (TLI) and/or float switch condition.

• Sounding tube and striker plate condition.

• Suction and discharge piping condition.

• Fastener material and condition (correct fastener material is stainless steel).

3.5 Tank closing. The Contractor shall ensure that the tank(s) remain open for approximately 24 hours after completion of all authorized repair and preservation procedures. Notify the COTR at least 24 hours prior to closing the tank(s). After satisfactory inspection by the Coast Guard Inspector and completion of all authorized repairs, close tank manhole cover(s) with new gasket material conforming to AMS-C-6183.

Page 12 (Rev-1)

3.6 Operational test - final. After all authorized work is

complete, in the presence of the Coast Guard Inspector, the Contractor shall thoroughly test and prove the TLIs to be in satisfactory operating condition (see 4.1 (Equipment operation)). Submit a CFR.

4. NOTES

4.1 Equipment operation. Coast Guard personnel will operate

all shipboard machinery and equipment during all operational tests.

Page 13 (Rev-1)

24310_MWS_179 WPC (13 Feb 2007) 179A WPC (1 Mar 2007)

WORK ITEM 3: Remove, Inspect, and Reinstall Propeller Shafts

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to remove, inspect, and reinstall the four propeller shafts and two line shafts.

1.2 Government-furnished property.

MTI ITEM DESCRIPTION NSN/PN QTY

ESTIMATED

COST

($/UNIT)

Y Inboard Shaft NSN: 2010-01-398-5361 2 ea. 20,665.00 Y Outboard Shaft NSN: 2010-01-398-5363 4 ea. 23,054.00

Y *Oil Injection Equipment Kit N/A 1 kit 1,500.00

N **Muff Coupling PN: SKF USA OKCE 115SS/176141 2 ea. 19,630.80

N FSE Service Kit 115MM PN: H76262-01-5 4 ea. 4160.06

N Inflatable Seal For 115 FSE PN: H76262-01-3-5 4 ea. 746.60

NOTE

The vessel's propulsion shafting consist of six individual shafts. The two outboard shaft lines each consists of one propeller shaft coupled with a line shaft. The two inboard shaft lines each consists of a single propeller shaft.

2. APPLICABLE DOCUMENTS

Coast Guard Maintenance and Logistics Command Atlantic (MLCA), Standard Specification 0000_STD, 2006 Edition, General Requirements

Coast Guard Maintenance and Logistics Command Atlantic (MLCA), Standard Specification 0740_STD, 2004 Edition, Welding and Allied Processes

NAVSEA Drawing 123-7086610, Rev A, Cofferdams Incdtl Fuel Tank Installation

Page 14 (Rev-1)

NAVSEA Drawing 161-6736936, Rev D, Stern Tube Installation Details

NAVSEA Drawing 161-6736938, Rev F, Main Strut Details

NAVSEA Drawing 161-6736939, Rev F, Intermediate Shaft Strut Details

NAVSEA Drawing 161-6736941, Rev H, Main Shaft Strut Installation

NAVSEA Drawing 161-6736942, Rev H, Intermediate Shaft Strut Installation

NAVSEA Drawing 201-6736981, Rev D, Propulsion Configuration

NAVSEA Drawing 243-5107134, Rev-, Propeller, Gearbox, and Muff Coupling Installation/Removal

NAVSEA Drawing 243-6736967, Rev L, Shafting Details

NAVSEA Drawing 243-6736968, Rev D, Hydraulic Nut and Oil Injection Equipment for Propulsion Shafting Installation

NAVSEA Drawing 243-6736983, Rev D, Shaft Locking Arrangement

NAVSEA Drawing 243-8273884, Rev A, Propulsion Shaft Stuffing Boxes Replace with Mechanical Seals

Deep Sea Seals Ltd Drawing H76262-01, Rev 1, GA of 115MM (4.527”) Fully Split FSE Seal

Deep Sea Seals Ltd Technical Publication (TP) TM-FSE-66248, March 2006, Technical Manual for Type FSE Seal U.S. Navy PC's

Bollinger Shipyard Lockport (BSL) Document 6B233C405, Aug 1993, Rev F, Propulsion Alignment Final Check

ASTM International (ASTM) D5363, 2003, Standard Specification for Anaerobic Single Component Adhesives

3. REQUIREMENTS

3.1 General.

3.1.1 Critical Inspection Report. The Contractor shall submit a critical inspection report (CIR) for the inspections listed in the following paragraph(s):

Page 15 (Rev-1)

• 3.2.1 (Disassembly).

3.1.2 Government Inspector. The Contractor shall make

allowances for the presence of a Government Inspector, who is familiar with the muff couplings, gear box couplings and propellers, and required removal equipment, and authorized to do the following, on site:

• Supply the oil injection kit needed to remove the muff coupling, gear box coupling and propellers.

• Advise on and ensure proper operating procedures of the oil injection kit are followed.

• Ensure that damage is prevented to the oil injection kit during use and storage at Contractor's facility.

• Ensure proper procedures during muff coupling, gear box coupling and propeller removal and installation are followed.

3.1.3 Technical Representative. The Contractor shall provide

the services of a Technical Representative (Tech Rep), who is familiar with the Wartsila (Model Number H76262-01) shaft seal system, and authorized by the manufacturer, to accomplish the following tasks – on site:

• Assist with proper installation, removal, and repair methods.

• Be present and ensure compliance with manufacturer's procedures and standards during disassembly, inspection, and reassembly of the seal.

3.1.3.1 The Contractor shall ensure that the Tech Rep possess a résumé of demonstrated experience with the system described above.

3.1.3.2 The Contractor shall submit a copy of the Tech Rep’s

résumé and a list of references to the COTR at the Arrival Conference.

3.2 Requirements. The Contractor shall accomplish the

following using NAVSEA Drawings 123-7086610, 161-6736936, 161- 6736938, 161-6736939, 161-6736941, 161-6736942, 201-6736981, 243-5107134, 243-6736967, 243-6736968, 243-6736983, 243-8273884, Deep Sea Seals Ltd Drawing H76262-01, and TM-FSE-66248 as guidance.

Page 16 (Rev-1)

3.2.1 Disassembly. Disassemble the four bulkhead seal

assemblies for the inboard and outboard shafts. Clean each part free of foreign matter, leaving no residue. Measure and record the sizes and clearances of each wearing part and fit area.

Submit a CIR.

3.2.1.1 Prior to the removal of the outboard shafts, the

Contractor shall disassemble the muff coupling, gear box coupling and propellers. Clean the muff coupling free of all foreign matter.

3.2.1.1.1 Visually inspect and measure the muff couplings for any damage or defects. Submit a CIR.

3.2.1.1.2 Government’s right for changing out muff coupling.

The Contractor shall be aware that the Government reserves the right to furnish a new muff coupling for installation in place of the existing muff coupling. If the Government exercises this right, the Contractor shall dispose of the old muff coupling in accordance with all applicable Federal, state, and local regulations.

3.2.1.2 Disassemble each line shaft pedestal bearing.

3.2.2 Removal. The Contractor shall remove the six existing

propeller shafts using NAVSEA Drawings referenced in section 2 above as guidance. When removing the propeller shafts, ensure that a Wartsila certified tech rep is present as the shafts will have to be slid through the shaft seals.

3.2.2.1 Provide proper support to the reduction gear/propulsion shaft flange to prevent it from drooping and sagging during shaft removal.

3.2.2.2 Protect the shafts from damage during removal, storage, and transport.

3.3 Shaft inspections. The Contractor shall receive new

Government-furnished shafts. Ensure the Government-furnished shaft surfaces are clean of all surface contaminants; and set up each shaft in a lathe, and accomplish the below inspections.

Submit CFR:

3.3.1 Visual inspection. The Contractor shall accomplish the

following:

Page 17 (Rev-1)

• Visually inspect the propeller shaft, and all associated components including propeller nut, gear nut, locking fasteners, hydraulic nut assembly, and coupling, for evidence of corrosion, pitting, surface cracks, or other defects.

• Visually inspect the forward, main, and intermediate strut bearings, stern tube bearings, and line shaft pedestal bearings, for excessive wear and un-bonding.

3.3.2 Measurements. The Contractor shall accomplish the

following:

• Measure the line shaft pedestal bearing, intermediate, forward, and main strut bearing, and stern tube bearing journals diameters and runouts.

• Measure the line shaft pedestal bearing, intermediate, forward, and main strut bearing, and stern tube bearing inside diameters.

• Calculate the bearing clearance by subtracting the bearing journal diameter from the bearing inside diameter readings.

• Measure straightness runouts within 2 inches of each shaft end.

• Measure for eccentricity and straightness. The maximum eccentricity of the journal during a complete revolution shall not exceed 0.01" in any shaft section.

NOTE

The permissible variation (through 1 revolution) from straightness is 0.052".

3.3.3 Nondestructive. Perform nondestructive inspection of all shaft tapers and welded repair surfaces, in accordance with Std Spec 0740_STD, Appendix C.

3.3.4 Alignment check. The Contractor shall check the

alignment of all struts and the stern tube by a taut wire or an optical method using NAVSEA Drawings 161-5106727, 161-5106728, and 161-5106729 as guidance. The theoretical straight line shall start from the center of the reduction gear output flange to the center of the aft strut. Record the relative positions at each bearing. This shall establish a baseline shaft alignment check.

Page 18 (Rev-1)

3.4 Cofferdam and internal components. The Contractor shall

accomplish the following:

3.4.1 Strut nuts. Visually inspect all strut nuts for

deterioration or defects. Submit CFR.

NOTE

The Contractor shall be aware that the inspection of the strut nuts and cotter pins for the forward struts and intermediate struts must be accomplished from cofferdams inside the surrounding fuel tanks.

3.4.2 Cotter pins. Renew all cotter pins using Contractor-

furnished material.

3.4.3 Cofferdam gasket renewal. Renew six strut cofferdam

gaskets with cork gasket material using Contractor-furnished material.

NOTE

The Contractor shall be aware that the use of cork gasket material is an authorized deviation from NAVSEA Drawing 123-7086610 which calls for rubber gasket material as per NSTM 541, Chapter

9.

3.4.4 Fastener renewal. Renew all strut cofferdam fasteners to match existing using CRES 316 material.

3.5 Shaft reinstallation. The Contractor shall reinstall the

four Government-furnished propeller shaft assemblies and all associated components to their original configuration as shown on the applicable drawings and technical publication referenced in Section 2. Be aware that the final positions of all four shaft assemblies shall be at the same original positions, unless shaft realignment has been authorized by the KO.

NOTE

When reinstalling the propeller shafts, ensure that a Wartsila certified tech rep is present as the shafts will have to be slid through the shaft seals to be installed.

3.5.1 Reassemble the muff couplings, gear box couplings and

propellers. Attain a proper "draw" of 0.182" - 0.192".

NOTE

If ambient air temperature is below 40 degrees Fahrenheit, allow double the time before releasing the hydraulic oil pressure from the hydraulic nut.

Page 19 (Rev-1)

3.5.2 Reassemble the shaft locking devices.

3.5.3 Prior to final coupling to reduction gear, complete

procedures outlined in paragraph 4.1.4 and 4.1.6 of Bollinger Shipyard Lockport (BSL) Document 6B233C405. Submit CFR.

3.5.4 Secure each shaft coupling to the reduction gear output flange with new bolting hardware. After each bolt is completely threaded on to the shaft coupling, ensure that the first two exposed threads are covered with nonpermanent, sealing compound, conforming to ASTM D5363.

3.6 Operational test. The Contractor shall demonstrate proper operation of all propulsion shafts without any vibration and/or binding. Inspect and correct any abnormal noise and vibration generated from the shaft or bearings. Inspection should include all bulkhead seal assemblies and stern tube seals, acceptable leakage rate shall be in accordance with shipboard PMS. Submit

CFR

3.7 In-process quality control measures. The Contractor shall abide by all the safety, preservation, and quality control requirements specified in Std Spec 0000_STD, paragraph titled "General preservation requirements for preservation work in this item.

NOTE

Surfaces being preserved are considered "critical-coated surfaces".

4. NOTES

Page 20 (Rev-1)

24410_MWS_179 WPC (18 Sep 2008) 179A WPC (1 Mar 2007)

WORK ITEM 4: Renew Shaft Bearings

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to renew the 14 shaft bearings for the four propeller shafts.

NOTE

There are two stern tube bearings, two intermediate strut bearings, and two main strut bearings for the inboard shafts. There are two stern tube bearings, two forward intermediate strut bearings, two aft intermediate strut bearings, two main strut bearings, and two line shaft bearings for the outboard shafts.

1.2 Government-furnished property.

MTI ITEM DESCRIPTION NSN/PN QTY ESTIMATED

COST

($/UNIT)

N Main Shaft Strut

Bearing, Bronze and rubber cutlass bearing, 4" ID x 5" OD x 16" Long

Duramax Marine #861154134-1

4 ea. 1,208.00

N Intermediate Shaft Strut Bearing, Bronze and rubber cutlass bearing, 4" ID x 5" OD x 16" Long

Duramax Marine #871154100

4 ea. 437.24

N Stern Tube Bearing, Bronze and Rubber cutlass bearing, 4" ID x 5" OD x 8" Long

Duramax Marine #861154137-1

4 ea. 1290.00

N Pedestal Bearing Duramax Marine #871154134

2 ea. 560.00

2. APPLICABLE DOCUMENTS

Coast Guard Maintenance and Logistics Command Atlantic (MLCA), Standard Specification 0000_STD, 2006 Edition, General Requirements

Coast Guard Commandant Instruction (COMDTINST) M10360.3 (series), Jun 2006, Coatings and Color Manual

Page 21 (Rev-1)

NAVSEA Drawing 161-6736936, Rev D, Stern Tube Installation Details

NAVSEA Drawing 161-6736938, Rev F, Main Strut Details

NAVSEA Drawing 161-6736939, Rev F, Intermediate Shaft Strut Details

NAVSEA Drawing 161-6736941, Rev H, Main Shaft Strut Installation

NAVSEA Drawing 161-6736942, Rev H, Intermediate Shaft Strut Installation

NAVSEA Drawing 201-6736981, Rev D, Propulsion Configuration

NAVSEA Drawing 243-6736967, Rev L, Shafting Details

3. REQUIREMENTS

3.1 Inspection of Government-furnished bearings. After

receiving the Government-furnished bearings, the Contractor shall visually inspect the bearings for damage or defects.

Measure and record the bearing dimensions, and submit a CFR.

3.2 Bearing renewals. The Contractor shall accomplish the

following, for each bearing using NAVSEA Drawings 161-6736936, 161-6736938, 161-6736939, 161-6736941, 161-6736942, 201-6736981, and 243-6736967 as guidance:

3.2.1 Stern tube bearings. Renew the stern tube bearings with Government-furnished bearings.

3.2.1.1 Bearing housing inspection. After removing the

existing stern tube bearings, clean and visually inspect the associated stern tube bearing housing bores for any corrosion and other defects. Measure and record all bearing housing inside diameters at forward, aft, and middle positions. Submit a CFR.

WARNING!

DO NOT drill new holes, if holes and taper pins already exist.

Page 22 (Rev-1)

3.2.1.2 Stern tube bearing housing preservation. Following the above inspections, and prior to the installing the new stern tube bearings, the Contractor shall prepare and coat each stern tube bearing housing in accordance with Std Spec 0000_STD, paragraph titled "General preservation requirements", using the system specified for "Underwater Water (U/W) Body and Boot-Top (U/W Body and Boot-Top, Steel Hulls (5-10 Years), in Salt Water)" in COMDTINST M10360.3, Appendix A (Cutters and Boats Exterior Painting Systems). Select finish/top coat color to match existing adjacent surfaces.

3.2.2 Pedestal bearings. Renew the line shaft pedestal bearings with Government-furnished bearings.

3.2.3 Strut bearings. Renew the forward, main, and intermediate strut bearings with Government-furnished bearings as shown on NAVSEA Drawings 161-6736936, 161-6736938, 161-6736939, 161- 6736941, 161-6736942, 201-6736981, and 243-6736967.

3.2.3.1 Bearing housing inspection. After removing the existing forward, main and intermediate strut bearings, clean and visually inspect the associated bearing housings' bores for any corrosion and other defects. Measure and record all bearing housing inside diameters at forward, aft, and middle positions.

Submit a CFR.

3.2.3.2 Strut bearings housing preservation. Following the

above inspections, and prior to the installing the new strut bearings, the Contractor shall prepare and coat each strut bearing housing in accordance with Std Spec 0000_STD, paragraph titled "General preservation requirements", using the system specified for "Underwater Water (U/W) Body and Boot-Top (U/W Body and Boot-Top, Steel Hulls (5-10 Years), in Salt Water)" in COMDTINST M10360.3, Appendix A (Cutters and Boats Exterior Painting Systems). Select finish/top coat color to match existing adjacent surfaces.

3.2.4 Machining. Machine the new bearing outside diameter to

suit the bearing housing bore dimension including any stepping.

Drill and tap new set screw holes on the bearing shell to match the set screw holes on the struts or stern tube.

3.3 Fasteners. During bearing installation, the Contractor

shall renew all the fasteners with Type 316 stainless steel fasteners.

Page 23 (Rev-1)

3.4 Report. Following installation of all bearings the

Contractor shall measure and record the new bearing clearance readings for the main strut, intermediate strut, forward strut, line shaft pedestal, and stern tube bearings. Submit CFR.

NOTE

The new bearing clearance shall be as close to the minimum bearing clearance (0.022") as possible.

3.5 Operational testing. The Contractor shall observe the

normal operations of the newly installed bearings (see 4.1 (Equipment operation)). Pay special attention to any excessive vibrations, abnormal noises, and high temperatures at the bearings.

3.6 In-process quality control measures. The Contractor shall abide by all the safety, preservation, and quality control requirements specified in Std Spec 0000_STD, paragraph titled "Preservation requirements - general" for preservation work in this item.

NOTE

Surfaces being preserved are considered "critical-coated surfaces".

4. NOTES

4.1 Equipment operation. Coast Guard personnel will operate

all shipboard machinery and equipment during all tests.

Page 24 (Rev-1)

24510_MWS_179 WPC (18 Sep 2008) 179A WPC (1 Mar 2007)

WORK ITEM 5: Remove, Inspect, and Reinstall Propellers

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to remove, inspect, and reinstall the four propellers.

1.2 Government-furnished property.

MTI ITEM DESCRIPTION NSN/PN QTY ESTIMATED

COST

($/UNIT)

Y **Propeller, Right

Hand NSN: 2010-01-431-4203 2 ea. 13,052.00

Y **Propeller, Left Hand

NSN: 2010-01-431-4199 2 ea. 13,052.00

Y *Hydraulic Removal Assembly

N/A 1 ea. 2,500.00

2. APPLICABLE DOCUMENTS

Coast Guard Maintenance and Logistics Command Atlantic (MLCA), Standard Specification 0740_STD, 2004 Edition, Welding and Allied Processes

NAVSEA Drawing 243-6736967, Rev L, Shafting Details

NAVSEA Drawing 243-6736968, Rev D, Hydraulic Nut and Oil Injection Equipment for Propulsion Shafting Installation

NAVSEA Drawing 245-6736985, Rev B, Propeller Details

NAVSEA Drawing 243-5107134, Rev-, Propeller, Gearbox, and Muff Coupling Installation/Removal

American Society of Mechanical Engineers (ASME) B46.1, 2002, Surface Texture (Surface Roughness, Waviness, and Lay)

3. REQUIREMENTS

3.1 General.

Page 25 (Rev-1)

3.1.1 Government Inspector. The Contractor shall make

allowances for the presence of a Government Inspector, who is familiar with the equipment required to remove the propellers, and authorized to do the following, on site:

• Supply the hydraulic removal assembly necessary to remove the propeller nut.

• Ensure proper operating procedures of the hydraulic removal assembly are adhered to.

• Prevent damage to the hydraulic removal assembly during use and storage at Contractor's facility.

• Ensure proper procedures for propeller removal and installation are adhered to.

3.1.2 Removal. The Contractor shall remove each propeller from its associated shaft in accordance with NAVSEA Drawings 243- 6736967, 243-6736968, 245-6736985, and 243-5107134. Thoroughly clean the propeller, hub, and shaft taper free of all marine growth, dirt, and all other foreign substances.

3.2 Inspections. The Contractor shall perform the following

inspections and submit a CFR:

3.2.1 Visual. Visually inspect the following, for evidence of damage and defects:

• Each shaft taper, threads, propeller, propeller hub bore, and adjacent areas.

• The entire trailing edge of the propeller blades and the surface around the blade roots in the area of the anti-cavitation holes.

• The hub of the propellers, propeller nut, and the propeller fairing cones (if applicable).

3.2.2 Nondestructive inspection. Conduct non-destructive

inspection of the propeller surfaces for evidence of bend, cracks, or deformation, in accordance with Std Spec 0740_STD, Appendix C.

3.2.3 Measurement. Measure and record the following for each

propeller, and compare the readings with NAVSEA Drawing 245- 6736985:

• Propeller diameter.

• Blade thickness.

Page 26 (Rev-1)

• Blade pitch.

3.3 Polishing. After resolution of any noted defects, the

Contractor shall polish all surfaces of the propellers to a uniform 125 micro-inches finish, in accordance with ASME B46.1.

3.4 Reinstallation. The Contractor shall reinstall the

propellers in accordance with NAVSEA Drawings 243-6736967, 243- 6736968, 245-6736985, and 243-5107134.

3.4.1 Fastener renewal. Renew all lock wire and locking

compound for all fasteners. Reinstall the thread cap protector.

3.5 Propeller change-out. The Contractor shall be aware that

the Government reserves the right to furnish up to four new propellers for installation in-place of removed propeller(s).

When the Government exercises this right, the Contractor shall turn over the removed propeller to the Coast Guard PA as an MTI item.

Page 27 (Rev-1)

24520L_179 WPC (2 Mar 2007) 179A WPC (1 Mar 2007)

WORK ITEM 6: Repair Propeller Root Erosion

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to repair root erosion on a designated propeller.

1.2 Government-furnished property.

None.

2. APPLICABLE DOCUMENTS

Coast Guard Maintenance and Logistics Command Atlantic (MLCA), Standard Specification 0740_STD, 2004 Edition, Welding and Allied Processes

NAVSEA Drawing 245-6736985, Rev B, Propeller Details

American Welding Society (AWS) C5.6, Reapproved 1994, Recommended Practices for Gas Metal Arc Welding

3. REQUIREMENTS

3.1 Repairs. Upon completion of propeller inspection, which is covered in the “Remove, Inspect, and Reinstall Propellers” work item, the Contractor shall transport the propeller to a suitable repair facility and accomplish the following:

3.1.1 Welding procedures. At least 24 hours before performing, submit welding procedures to the COTR for approval.

3.1.2 Grinding. Grind and remove any cracks and defects to the base of the areas using a suitable high-speed grinding tool having a speed of approximately 12,000 rpm. The excavation shall be finished smooth, tapered at the sides and rounded at the bottom to facilitate welding.

Page 28 (Rev-1)

3.1.3 Heat treatment. Perform preheating treatment to the very thick bosses or blade root areas where welding is required. The preheating temperature shall be approximately 80 degrees C (176 degrees F).

3.1.4 Welding process. Perform all welding by gas metal arc

using AWS C5.6, with argon as inert gas for shielding. Avoid overheating; interrupt welding operation, to allow…