Wedge Spec Rev

USCGC WEDGE (WLR-75307)

75 FOOT RIVER BUOY TENDER

SPECIFICATION FOR DRYDOCK REPAIRS

Developed By:

Dale Passarella

Commander (v) Maintenance and Logistics Command, Atlantic 300 E. Main Street, Suite (600) Norfolk, VA 23510-9102

(January 15, 2009 / Rev-1)

USCGC WEDGE (WLR-75307) DRYDOCK AVAILABILITY 2009

TABLE OF CONTENTS

Work Item Title Page

List of Sketches iii

Revisions Record iv

List of Applicable References v

List of Government-furnished Property x

List of Critical Inspection Items xi

Specification Feedback xii

Principal Characteristics xiii

General Requirements 1

1 Remove, Inspect, and Reinstall Propeller Shafts 8

2 Straighten Shaft 12

3 Renew Water-Lubricated Shaft Bearings 14

4 Renew Propeller Shaft Sleeve(s) 17

5 Renew Shaft Strut Barrel 20

6 Remove, Inspect, and Reinstall Propellers 22

7 Perform Minor Repairs and Reconditioning of Propeller 26

8 Clean, Inspect, and Test Grid Coolers 30

9 Renew Steel Longitudinals and Hull Plating in Barge Main Hold 35

10 Overhaul and Renew Sea Valves 38

11 Inspect and Test Air Receivers and Relief Valves 41

12 Remove, Inspect, and Reinstall Rudder Assemblies 44

Page i (Rev-1)

13 Renew Rudder Lower Bearing Trunk 48

14 Preserve Spud and Spud Well Surfaces 50

15 Preserve Tender Freeboard – 100% 54

16 Preserve Barge Freeboard – 100% 57

17 Shrink Wrap Crane 60

18 Protect Small Boat Davit and Winch 62

19 Inspect Various Deck Fittings 64

20 Preserve Barge Buoy Deck 66

21 Renew Depth Indicating Transducers 69

22 Preserve Underwater Body (Barge) – 100% 72

23 Preserve Underwater Body (Tender) - 100% 74

24 Preserve Stern Tubes 76

25 Preserve and Disinfect Potable Water Tank (Barge) – 100% 78

26 Preserve and Disinfect Potable Water Tank (Tender) – 100% 81

27 Renew Barge Potable Water Transfer Piping 84

28 Routine Drydocking 87

29 Provide Temporary Logistics 91

Page ii (Rev-1)

List of Sketches

Work Item Sketch Number Page

This section is not applicable to this package.

Page iii (Rev-1)

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

14 Jan 2009 1

List of Critical Inspection Items

Added Work Item 14.

9 Modified paragraph 3.1.

12 Modified paragraph 3.1.3.

27 Modified paragraph 3.1.

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-1)

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

MIL-PRF-16173, 2006, Corrosive Preventive Compound, Solvent Cutback, Cold Application

MIL-PRF-18458, May 2003, Grease, Wire Rope-Exposed Gear

MIL-PRF-83483, Feb 1998, Thread Compound, Antiseize, Molybdenum Disulfide Petrolatum

MIL-STD-167-1, Nov 2005, Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Internally Excited)

MIL-STD-2191, Nov 1992, Repair Welding, Weld Cladding, Straightening, and Cold Rolling of Main Propulsion Shafting

OTHER GOVERNMENT DOCUMENTS, DRAWINGS, AND PUBLICATIONS

DOCUMENTS

Page v (Rev-1) http://www.uscg.mil/mlclant/vdiv/standard_specifications.asp

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

DRAWINGS

Coast Guard Drawing 75 WAGL 4400-2, Rev C, 75 FT. Tow-Boat Propeller, (75 WLIC A-B-D)

Coast Guard Drawing 75D WAGL 0103-4, Rev C, General Arrangement

– Main Deck & Hold

Coast Guard Drawing 75D WAGL 0700-1, Rev A, Docking Plan

Coast Guard Drawing 75D WAGL 2200-1, Rev A, Rudder Stock and Fittings (75306-75307)

Coast Guard Drawing 75D WAGL 2200-2, Rev A, Steering Gear ARRG’T (75306-75307)

Coast Guard Drawing 75D WAGL 2901-2, Rev -, Tank Capacities – Fresh Water, Fuel Oil, & Trim Tanks

Coast Guard Drawing 75D WAGL 4103-10, Rev -, Cooling Water Flow Diagram (75309-75310)

Coast Guard Drawing 75D WAGL 4103-11, Rev -, Cooling Water Piping Plan (75309-75310)

Coast Guard Drawing 75D WAGL 4103-2, Rev B, Cooling Water Piping Plan

Coast Guard Drawing 75D WAGL 4103-3, Rev C, Cooling Water Piping Plan

Page vi (Rev-1)

Coast Guard Drawing 75D WAGL 4103-4, Rev A, Cooling Water Piping Details (75306-75307)

Coast Guard Drawing 75D WAGL 4103-8, Rev -, Cooling Water Flow Diagram (75306-75307)

Coast Guard Drawing 75D WAGL 4301-1, Rev 1, Shafting and Bearings

Coast Guard Drawing 75D WAGL 4901-1, Rev B, Compressed Air Flow Diagram

Coast Guard Drawing 90 CGB 2002-1, Rev -, 90-FT. BARGE A-Frame Derrick – GEN’L ARRGEMT. - Spud & Spud Well

Coast Guard Drawing 90 CGB 4103-001, Rev 2, Barge Skin Cooling System

Coast Guard Drawing 90B CGB 0103-2, Rev -, General Plans

Coast Guard Drawing 90B CGB 0103-3, Rev 5, Outboard Profile

Coast Guard Drawing 90B CGB 2901-2, Rev -, Tank Capacity Table for 90’x 24’x 6’6” Special Barge

Coast Guard Drawing 90B CGB 3603-001, Rev -, Potable Water System for 90’x 24’x 6’-6” Special Barge

Coast Guard Drawing 90B CGB-500-1, Rev -, Lines & Framing Plan 90’-0” x 24’-0” x 6’-6” Spec Barge

Coast Guard Drawing 90B-CGB-1103-6, Rev -, Transv. Sections & Frames for 90’ x 26’ x 6’-6” Special Barge

Coast Guard Drawing 90B-CGB-2002-13, Rev -, USCGB 90’ X 26 X 6’- 6” New Crane Installation

Coast Guard Drawing FL 6713-201, Rev B, CRP-V850 Transducer (B-

14) Adapter Assembly

Coast Guard Fleet Drawing FL 2602-10, Rev D, Spud Arrangements and Details

NAVSEA Drawing 803-2145807, Rev C, Propulsion Shafting And Components

PUBLICATIONS

Page vii (Rev-1)

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

Raytheon V850 Color Echosounder, 2nd Edition, Mar 1993, Operation Manual

Fernstrum Gridcooler Installation and Maintenance Manual, 2006, Form 165

INDUSTRY STANDARDS

American Bureau of Shipping (ABS) 2, Rule Requirements for Survey After Construction, 2007, Part 7, Appendix Section 10, Guide for Bronze and Stainless Steel Propeller Castings

American National Standards Institute/NSF International (ANSI/NSF) 61, 2005, Drinking Water System Components - Health Effects

American Society for Testing and Materials (ASTM), D1709, 10 August 2001, Standard Test Methods for Impact Resistance of Plastic Film by the Free-Falling Dart Method

American Society for Testing and Materials (ASTM), D1922 Rev A, 10 November 2000, Standard Test Method for Propagation Tear Resistance of Plastic Film and Thin Sheeting by the Pendulum Method

American Society for Testing and Materials (ASTM) D882, 2002, Standard Test Method for Tensile Properties of Thin Plastic Sheeting

American Society of Mechanical Engineers (ASME), PTC 25, 2001, Pressure Relief Devices

American Water Works Association (AWWA) C652, 2002, Disinfection of Water-Storage Facilities

American Society of Mechanical Engineers (ASME) B16.34, 2004, Valves-Flanged, Threaded, and Welding End

Manufacturers' Standardization Society of the Valve and Fittings Industry (MSS) SP-80, 2003 Edition, Bronze Gate, Globe, Angle and Check Valves

Manufacturers Standardization Society of the Valve and Fittings Industry (MSS) SP-72, 1999 Edition, Ball Valves with Flanged or Butt-Welding Ends for General Service

Page viii (Rev-1)

Manufacturers Standardization Society of the Valve and Fittings Industry (MSS) SP-61, 2003 Edition, Pressure Testing Of Steel Valves

Commercial Item Description (CID) A-A-52624, Sep 2001, Antifreeze, Multi Engine Type, Ethylene Glycol (For Caterpillar applications, use CAT Extended Life Pre-Mix coolant.)

International Standard For Organization (ISO) 484/2, 1981, Shipbuilding - Ship Screw Propeller - Manufacturing Tolerances - Part 2: Propellers of Diameter Between 0.80 and 2.50 m, Inclusive

International Standard For Organization (ISO) 484/2, 1981, Shipbuilding - Ship Screw Propeller - Manufacturing tolerances - Part 2: Propellers of Diameter Between 0.80 and 2.50m, Inclusive

ASTM International (ASTM) D1330, 2004, Standard Specification for Rubber Sheet Gaskets

ASTM International (ASTM) D3951, Reapproved 2004, Standard Practice for Commercial Packaging

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

ASTM International (ASTM) F992, 2006, Standard Specification for Valve Label Plates

Page ix (Rev-1)

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)

1 Y **Shaft, Propeller NSN: 2010-01-377-2282 1 ea. 11,015.00

6 Y **Propeller Left Hand

NSN: 2010-01-377-2284 1 ea 6250.00

6 Y **Propeller Right Hand

NSN: 2010-01-377-2308 1 ea. 6250.00

12 Y **Rudder NSN: 2040-01-044-2516 1 ea. 2,500.00

Y **Rudder stock NSN: N/A 2 ea. 1,500.00

21 N ***Sonar Transducer

NSN: 5845-01-470-2500 3 ea. $172.38

*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 x (Rev-1)

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

1 Remove, Inspect, and Reinstall Propeller Shafts

8 Clean, Inspect, and Test Grid Coolers

12 Remove, Inspect, and Reinstall Rudder Assemblies

14 Preserve Spud and Spud Well Surfaces

24 Preserve Stern Tubes

Page xi (Rev-1)

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 xii (Rev-1) 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

PC_75D_WLR_Wedge_90'Barge (09 Jan 2004)

75D WLR

Principal Characteristics

75' WLR (D Class) "Wedge" Small Buoy River Tender

Length Overall 75' 0"

Depth (main deck at side to baseline) 7' 7-3/4"

Maximum Beam 22' 0"

Height of Highest Projection (above DWL) 32' 3"

Frame Spacing 1' 0"

Full Load Draft 5' 0"

Full Load Displacement 145 long tons

Shore Tie Voltage Requirements 440V/100A

PROPELLERS / SHAFT

Number of Propellers 2

Number of Blades per Propeller 5

Diameter of Propeller 44"

Pitch 50" fixed

Revolutions per Minute (RPM) 480

Shaft Diameter 4.5”

CG BARGE

Length Overall (LOA) 90' 0"

Depth (main deck at side to baseline) 6' 6"

Maximum Beam 24' 0"

Frame Spacing 1' 6"

Full Load Draft 3' 3"

Full Load Displacement N/A

Shore Tie Voltage Requirements 440V/100A

Page xiii (Rev-1)

00000_PWB_FLT (08 Apr 2008)

General Requirements

1. SCOPE

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

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.

NOTICE!

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.

3.4 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

Page 1 (Rev-1)

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.

3.5 Small boat storage particulars. When two aluminum skiff

small boats are removed as interference to Contractor-work, the Contractor shall provide a suitable pierside storage cradle, for safely storing said boat.

3.5.1 Aluminum skiff boat cradle design. Ensure that the two

(2) cradles meet the following criteria:

• Be capable of safely supporting a boat weighing approximately 2500 pounds.

• Support the boat at the following locations:

• Along the full length of the flat portion of the keel.

• Forward and aft, in the locations similar to those provided by the shipboard davit cradle.

Have the portions of the cradle directly contacting the hull or keel of the boat made from a homogeneous soft wood, such as Yellow Pine or Douglas Fir.

3.5.2 Boat protective cover. Provide a watertight cover with

raised wooden spreaders, to protect the small boat from nature, during the storage period.

3.5.3 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, if required.

3.5.4 Access to COMDTINST M10360.3. The COMDTINST M10360.3 may be accessed at the following URL address:

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

3.5.5 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.

4. NOTES

No additional requirements.

Page 2 (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 3 (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 4 (Rev-1)

QA-3 QUALITY ASSURANCE INSPECTION FORM

SURFACE PROFILE LOG

Vessel Name And Hull Number:____USCGC WEDGE (WLR 75307)____________________

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 5 (Rev-1)

QA-4. QUALITY ASSURANCE INSPECTION FORM

SURFACE SOLUBLE SALT CONDUCTIVITY LOG

Vessel Name and Hull Number:____ USCGC WEDGE (WLR 75307)___________________

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 6 (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:____ USCGC WEDGE (WLR 75307)__________________

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 7 (Rev-1)

24310L_FLT (12 Apr 2007) 75307 D WLR (26 Oct 2007)

WORK ITEM 1: 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 a designated propeller shafts.

1.2 Government-furnished property.

MTI ITEM

DESCRIPTION NSN/PN QTY

ESTIMATED

COST

($/UNIT)

Y **Shaft, Propeller NSN: 2010-01-377-2282 1 ea. 11,015.00

2. APPLICABLE DOCUMENTS

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), Coatings and Color Manual

Coast Guard Drawing 75D WAGL 4301-1, Rev 1, Shafting and Bearings

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):

• 3.2.2 (Inspections).

3.1.2 Related work items. The Contractor shall accomplish this work item in conjunction with the following, which are separate work items in this specification package:

Page 8 (Rev-1)

• “Remove, Inspect, and Reinstall Propellers".

• “Renew Water-Lubricated Shaft Bearings”.

• “Renew Propeller Shaft Sleeve(s)”.

• “Renew Shaft Strut Barrel”.

3.1.3 Interferences. The Contractor shall be aware that

interferences in way of work include, but are not limited to the following:

• Rope guard

• Fairwater

• Rudders.

3.2 Work to be accomplished. Using Coast Guard Drawing 75D WAGL 4301-1 as guidance, as applicable, the Contractor shall accomplish the following for a designated propeller shafts:

3.2.1 Removals.

• Mark existing shaft position, and match-mark shaft coupling bolts to their respective holes, to facilitate reinstallation procedures.

• Remove the shaft and attached components to a suitable repair facility. Ensure shaft is properly protected and supported at all bearing journals, at all times, until reinstallation.

3.2.2 Inspections. Clean the shaft free of all marine growth, and accomplish the following inspections (Submit CIR):

3.2.2.1 Visually inspect the following components, as applicable, for excessive wear and other mechanical defects such as nicks, cracks, and corrosion, as applicable:

• Shaft surfaces.

• Bearing surfaces.

• All shaft and propeller associated fasteners.

• Couplings.

• Stern tube/shaft sealing systems.

• Packing ring and glands.

NOTICE!

Page 9 (Rev-1)

Before taking shaft runout readings, spin the shaft on a lathe for approximately two hours at the vessel's maximum rated RPM to eliminate any sagging that may have occurred during handling and storage.

3.2.2.2 Accomplish the following measurements:

• Measure keys and keyways.

• Measure all bearing sleeve or journal diameters.

• Measure runouts for shaft taper, shaft straightness, and coupling end diameters.

• With the key in-place, fit the shaft coupling to the shaft in shop and check the contact percentage by bluing.

If the contact is less than 80%, the Contractor shall grind and hand stone the coupling hub to achieve a minimum of 80 percent contact, and verify by bluing again. Make a small inscription on the shaft to mark the coupling hub location and use it as a reference in final assembly. Measure and record the coupling face and bore runouts.

3.2.2.3 Perform nondestructive inspection of all bearing sleeves, shaft tapers, coupling bolts, keyways, and welded repair surfaces, in accordance with Std Spec 0740_STD, Appendix C.

3.2.3 Stern tube inspection. The Contractor shall perform a

visual inspection of the stern tube interior surfaces, and submit a CFR.

3.2.4 Reinstallation. Reinstall the propeller shaft to its original configuration and accomplish the following, using Coast Guard Drawing 75D WAGL 4301-1, as applicable.

3.2.4.1 Machine, grind, or hand-stone couplings, if necessary, to achieve an 80 percent contact. True couplings to shaft by cutting coupling faces and land area.

3.2.4.2 Renew all stainless steel self-locking nuts for packing glands.

3.2.4.3 Renew all packing materials.

Page 10 (Rev-1)

3.3 Post-repair operational testing. In the presence of the

Coast Guard Inspector, the Contractor shall thoroughly test and prove the shafting system to be in satisfactory operating condition. Conduct a sea trial to test the propeller shaft in all modes of operation for a minimum of 4 hours. Inspect and correct any excessive leakage, abnormal noise and excessive vibration.

3.4 Government’s option for equipment renewal. The Contractor shall be aware that the Government reserves the right to furnish a new rudder or rudder stock (or both) for installation in place of the existing component, at no additional cost to the Government. If the Government exercises this right, the Contractor shall turn over the designated component to the Coast Guard Property Administrator as an MTI item.

4. NOTES

This section is not applicable to this work item.

Page 11 (Rev-1)

24350L_FLT (06 Mar 2006) 75307 D "Wedge"_WLR (23 Jan 2004)

WORK ITEM 2: Straighten Shaft

1. SCOPE

1.1 Intent. This work item describes the requirements

for the Contractor to straighten a designated shaft.

1.2 Government-furnished property.

None.

2. APPLICABLE DOCUMENTS

MIL-STD-2191, Nov 1992, Repair Welding, Weld Cladding, Straightening, and Cold Rolling of Main Propulsion Shafting

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

Coast Guard Drawing 75D WAGL 4301-1, Rev 1, Shafting and Bearings

3. REQUIREMENTS

3.1 Shaft straightening requirements. Based on

inspection results obtained from a related shaft work item in this specification package, or provided by the Coast Guard Inspector, the Contractor shall straighten the designated shaft, using Coast Guard Drawing 75D WAGL 4301- 1, and MIL-STD-2191 as guidance and as specified herein.

3.1.1 Pre-straightening inspection. Prior to initiating

straightening processes, determine the location, magnitude and type of bend in the shaft, with the entire shaft supported on centers in a lathe, as follows:

• Before taking shaft runout readings, spin the shaft on the lathe for approximately two hours to eliminate any sagging that may have occurred during handling and storage.

Page 12 (Rev-1)

• Conduct a dial indicator survey of shaft runout at stations spaced every two feet of shaft length to determine the magnitude and location of the bend.

• At each station, mark the position of maximum runout on the periphery of the shaft.

NOTICE!

Be aware that the marks on the shaft periphery will be in a straight line if the shaft contains a simple bend, and will spiral part way around the shaft, if the shaft is both bent and twisted.

• Plot the maximum runout to an exaggerated scale, in order to locate the center of the bend, and to determine the extent of straightening required.

• Submit a CFR including locations and magnitudes of the bend.

3.1.2 Straightening procedures. Straighten the shaft to

equal or less than 0.005" total indicator runout, using the localized heating (hot spotting method for carbon steel shafts, in accordance with MIL-STD-2191, Section

11.2.2.2 and sub-paragraphs).

3.1.3 Post-straightening inspections. After completion

of straightening procedures, accomplish inspections, and submit a CFR:

• Conduct non-destructive inspection of all straightened areas in accordance with Std Spec 0740_STD, Appendix C.

• Recheck the shaft surfaces, as specified in paragraph

3.1.1 (Pre-straightening inspection).

3.2 Government’s option for equipment renewal. The Contractor shall be aware that the Government reserves the right to furnish a new rudder or rudder stock (or both) for installation in place of the existing component, at no additional cost to the Government. If the Government exercises this right, the Contractor shall turn over the designated component to the Coast Guard Property Administrator as an MTI item.

4. NOTES

Page 13 (Rev-1)

24400L_FLT (01 Aug 2007) 75307_DMP (30 Jul 2008)

WORK ITEM 3: Renew Water-Lubricated Shaft Bearings

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to renew the water-lubricated bearings for the port and starboard shafts.

1.2 Government-furnished property.

None.

2. APPLICABLE DOCUMENTS

Coast Guard Drawing 75D WAGL 4301-1, Rev 1, Shafting and Bearings

3. REQUIREMENTS

3.1. Related work items. The Contractor shall accomplish this work item in conjunction with the following, which are separate work items in this specification package:

• “Remove, Inspect, and Reinstall Propeller Shafts”.

• “Remove, Inspect, and Reinstall Propellers”.

• “Preserve Stern Tubes”.

3.2 Related work item. The Contractor shall perform this work in conjunction with "", which is a separate work item in this specification package.

3.3 Bearing renewal. The Contractor shall accomplish the

following, using Coast Guard Drawing 75D WAGL 4301-1 as guidance:

3.3.1 Removal. Remove the existing water-lubricated bearings;

dispose of the removed bearings after visually inspection for any abnormal wear patterns which may indicate misalignment.

Submit CFR.

Page 14 (Rev-1)

3.3.2 Inspections.

3.3.2.1 Visual. Visually inspect the following:

• Chocking material, if installed in the bearing housings.

• Bearings.

• Bearing housing bores.

• Shaft journal in way of bearings.

3.3.2.2 Measurements. Measure the inner diameter of each

bearing housing at the forward, middle and aft positions.

3.3.2.3 Documentation. Submit a CFR after the inspection and

measurements.

3.3.3 New bearing installation. The Contractor shall furnish

water-lubricated bearings, and accomplish the following, using Coast Guard Drawing 75D WAGL 4301-1 as guidance:

3.3.3.1 In the presence of the Coast Guard Inspector, the

Contractor shall check the alignment of the stern tube, forward seal flange, and bearing carriers relative to the shaft centerline including any offsets by running a taut line, using the optical scopes method, or using laser alignment.

3.3.3.2 Machine the new bearings to fit the bearing housing in accordance with the manufacturer's installation recommendations.

Drill and tap new bolt holes on the new bearings to match the bearing housings for proper fit.

3.3.3.3 Install the new water-lubricated bearings in accordance with the bearing manufacturer's recommendations, using new monel or type 316 stainless steel fasteners.

3.4 Final measurement. After bearing installation, the

Contractor shall:

3.4.1 Measure final bearing clearances at 90-degree intervals around the shaft atforward and aft ends of the bearing: a total of 8 measurements per bearing.

3.4.2 Submit a CFR after taking the measurements.

3.4.3 Minimum operating bearing clearance shall be as follows:

DIAMETER OF

JOURNAL

(INCHES)

MINIMUM OPERATING CLEARANCE

OF NEW WATER-LUBRICATED

BEARINGS (INCHES)

Page 15 (Rev-1)

3 0.022 4 0.025 5 0.027 6 0.030 7 0.032 8 0.035 9 0.037 10 0.040 11 0.042 12 0.045 13 0.047 14 0.050

3.5 Inspection and operational test. The Contractor shall

accomplish the following:

3.5.1 Visual inspection. Visually inspect the new bearings and record bearing clearances, after shaft reinstallation.

3.5.2 Operational test. Conduct an operational test of the

shaft during sea trials, to ensure there is no evidence of binding, abnormal vibration, and noise during sea trials.

3.5.3 Inspection and test documentation. Submit a CFR upon

completion of inspection and test.

4. NOTES

Page 16 (Rev-1)

24420L_FLT (15 Dec 2006) 75D WLR (30 Jan 2004)

WORK ITEM 4: Renew Propeller Shaft Sleeve(s)

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to renew the sleeve(s) on the port and starboard propeller shafts.

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

Coast Guard Drawing 75D WAGL 4301-1, Rev 1, Shafting and Bearings

NAVSEA Drawing 803-2145807, Rev C, Propulsion Shafting And Components

3. REQUIREMENTS

3.1 Related work items. The Contractor shall accomplish this

work item in conjunction with the following, which are separate work items in this specification package:

• “Remove, Inspect, and Reinstall Propeller Shafts”.

• “Preserve Stern Tubes”.

3.2 Sleeve renewal requirements. Using Coast Guard Drawing 75D WAGL 4301-1 as guidance, the Contractor shall accomplish the following, for the port and starboard propeller shafts:

3.2.1 Removal. Remove and dispose of the sleeve(s).

3.2.2 Inspections. Clean all shaft journal surfaces, and

Page 17 (Rev-1) accomplish the following:

3.2.2.1 Perform a visual inspection of the shaft journal

surfaces for corrosion, deterioration, and other signs of failures.

3.2.2.2 Measure and record in the shaft journal outside

diameter and the shaft bearing inside diameter in the following positions:

• Forward.

• Middle.

• Aft.

3.2.2.3 Conduct nondestructive testing of all shaft surfaces in the way of sleeve fit areas, in accordance with Std Spec 0740_STD, Appendix C.

3.2.3 Inspection report. The Contractor shall submit a CFR for the completed inspection and measurements.

3.2.4 New sleeve installation requirements. After the Coast

Guard Inspector has reviewed all measurement findings, the Contractor shall furnish new hard steel nickel-chrome-boron shaft sleeves (see 4.1) and accomplish the following:

3.2.4.1 Bore new sleeve ID to the dimensions based on the

recorded shaft journal OD readings, to facilitate an interference fit, as specified below.

3.2.4.2 Install the new sleeves onto the shaft with a shrink-fit equal to 0.00075-inch per inch of shaft diameter, in accordance with NAVSEA HM&E-STD 803-2145807, Table 8-1 (Shaft Sleeve Shrink Fit).

3.2.4.3 After installation, machine new steps at the end of

each sleeve where the shaft covering is required.

3.2.5 Concentricity measurement. Check the outside diameter of each shaft sleeve to ensure it is concentric with the axis of rotation within 0.0005 inch (0.001 inch runout).

3.2.6 Polishing. Polish the sleeve surfaces to a 32 micro-inch RMS finish, upon completion of installation and all required machining.

3.3 Final documentation. The Contractor shall provide a

complete set of the new sleeve dimensional readings to the COTR

Page 18 (Rev-1) within 48 hours after completion of sleeve installation. At a minimum, the set of readings shall include the new sleeve length, diameters (inside and outside) at the bearing journals, concentricity, and polish.

4. NOTES

4.1 Nickel-chrome-boron shaft sleeve suppliers. Suppliers for the nickel-chrome-boron shaft sleeve include, but are not limited to the following:

National Maintenance and Repair Hartford, Illinois Phone: (618) 254-7451

Dover Corp/Dover Diversified/Waukesha Bearings Corporation Waukesha, Wisconsin Phone: (414) 547-3381

Page 19 (Rev-1)

24430L_WLIC_WLR (06 Apr 2006) 75D WLR (09 Aug 2004)

WORK ITEM 5: Renew Shaft Strut Barrel

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to renew the strut barrel for a designated shaft.

1.2 Government-furnished property.

None.

2. APPLICABLE DOCUMENTS

Coast Guard Drawing 75D WAGL 4301-1, Rev 1, Shafting and Bearings

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

3. REQUIREMENTS

3.1 Related work item. The Contractor shall perform this work in conjunction with "Remove, Inspect, and Reinstall Propeller Shafts", which is a separate work item in this specification package.

3.2 Strut barrel renewal. The Contractor shall accomplish the following, using Coast Guard Drawing 75D WAGL 4301-1 as guidance:

3.2.1 Removal. Crop, remove, and dispose of the designated

shaft strut barrel.

3.2.2 New barrel fabrication, alignment and installation.

Fabricate a new shaft strut barrel, using the existing barrel as template. In conjunction with the shaft alignment specified in the "Remove, Inspect, and Reinstall Propeller Shafts" work item, position the new strut barrel to ensure proper alignment to the shaft centerline. Once correct alignment has been established, accomplish the following:

Page 20 (Rev-1)

3.2.2.1 Tack-weld the strut barrel to the vertical shaft strut and ensure that proper alignment is maintained between the strut, stern tube and cooper bearing.

3.2.2.2 After proper alignment has been verified, weld the

strut barrel in place.

3.2.2.3 Line bore the strut barrel to the shaft centerline, with any proper bearing off-set as required.

3.2.2.4 Conduct a final alignment check; ensure alignment is

within 0.005".

3.2.3 Documentation. Submit to the COTR a written report of

all recorded readings and measurements taken as part of this work item.

3.3 Preservation. The Contractor shall preserve all new and

disturbed surfaces, using the system specified "Underwater Water (U/W) Body and Boot-Top (U/W Body and Boot-Top, Steel Hulls, in Fresh Water)" in COMDTINST M10360.3, Appendix A (Cutters and Boats Exterior Coating Systems).

3.4 Shaft strut renewal. If a Change Request has been released and authorized by the Contracting Officer (KO), the Contractor shall fabricate and install a new shaft strut, as shown on Coast Guard Drawing 75D WAGL 4301-1. Prepare and paint the new strut, as specified in section 3.3 (Preservation) herein.

4. NOTES

Page 21 (Rev-1)

24500L_FLT (20 June 2007) 75D WLR_DMP (02 Sept 2008)

WORK ITEM 6: Remove, Inspect, and Reinstall Propellers

1. SCOPE

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

DESCRIPTION NSN/PN QTY

ESTIMATED

COST

($/UNIT)

Y **Propeller Right Hand NSN: 2010-01-377-2308 1 ea. 6250.00

Y **Propeller Left Hand NSN: 2010-01-377-2284 1 ea 6250.00

2. APPLICABLE DOCUMENTS

MIL-PRF-16173, 2006, Corrosive Preventive Compound, Solvent Cutback, Cold Application

Coast Guard Drawing 75 WAGL 4400-2, Rev C, 75 FT. Tow-Boat Propeller, (75 WLIC A-B-D)

International Standard For Organization (ISO) 484/2, 1981, Shipbuilding - Ship Screw Propeller - Manufacturing Tolerances - Part 2: Propellers of Diameter Between 0.80 and 2.50 m, Inclusive

3. REQUIREMENTS

3.1 Related work items. The Contractor shall accomplish this

work item in conjunction with the following, which are separate work items in this specification package:

• “Remove, Inspect, and Reinstall Propeller Shafts".

• “Remove, Inspect, and Reinstall Rudder Assemblies”.

Page 22 (Rev-1)

3.2 Protective and safety measures. The Contractor shall

accomplish the following:

• Before removing each propeller or propeller nut, fit a shore from the floor of the dock to one propeller blade near the root, to prevent shock transmission to reduction gear, as necessary.

• Protect propeller blade edges and blade roots with suitable covers, at all times until reinstallation, to prevent damage.

3.3 Work to be accomplished. The Contractor shall accomplish

the following for each propeller using Coast Guard Drawing 75 WAGL 4400-2 as a reference:

3.3.1 Removal. Remove the propeller to a suitable repair shop.

NOTICE!

If it becomes necessary to apply heat to facilitate propeller removal, ensure that the hub temperature never exceeds 500 degrees Fahrenheit; in addition, ensure that gland, packing ring, fill and vent plugs are removed, and the adjacent shafting and canvas under the blade edge guards are protected from flame impingement.

3.3.2 Inspection. Visually inspect the propeller for any

damage, cracks, and other defects. Examine and record the suction and pressure face thickness, blade tip profiles, leading and trailing edges, contours, track, width, diameter, taper, pitch, and keyway of the propeller in accordance with ISO 484/2, Class I. Submit a written CFR.

3.3.3 Polishing. Polish the propeller to a uniform 63 micro-

inch RMS finish.

3.3.4 Propeller hub fitting check. In the presence of the

Coast Guard Inspector and with the key in place, carefully check the fit of the propeller hub bore to the shaft taper by applying Prussian blue to the shaft taper.

3.3.4.1 Uniform fit. Obtain a uniform fit of 60 percent

contact over the taper, with a slightly heavier fit on the larger end. Do not heat the shaft taper to compensate for a poor fit.

3.3.4.2 Propeller fit. If the fit is less than 60 percent, hand grind/stone the propeller hub bore to achieve the required fit.

Page 23 (Rev-1)

WARNING!

Do not machine the shaft taper.

3.3.4.3 Location inscription. When 60 percent fit has been

obtained, make a small inscription on the shaft to mark the propeller location. Use this mark as a reference in final assembly.

3.4 Propeller Installation.

3.4.1 Cleaning. For the final assembly, the propeller bore and shaft taper surfaces shall be clean and free of bluing, lubricants, dirt, foreign particles, or any other substance, which would hinder moving the propeller along the taper.

Install the propeller with dry metal-to-metal contact to obtain the maximum frictional force for torque transmission. Renew the rubber O-rings and packing before reassembly, if applicable.

3.4.2 Assembly. With the propeller installed on the taper in

the same position as when fitted, install the propeller nut and drive up the propeller until it is advanced forward about 1/16" beyond the inscribed mark as specified in 3.2.4.3 (Location inscription). Lock the nut in place with an appropriate locking device.

NOTICE!

It is prohibited to use grease, oil, or other substances on the taper to help drive the propeller.

3.4.3 Void filling. When applicable, the Contractor shall fill all internal voids in the propeller hub and cap with rust preventive compound conforming to MIL-PRF-16173. Renew all brass plugs.

3.4.4 Adhere to the following warnings:

• Do not heat the propeller hub, to compensate for a poor fit on the shaft taper.

• Do not machine the shaft taper to achieve the required fit.

3.4.4.1 Lock propeller nut in place with new stainless steel

lock washer or monel cap screws.

Page 24 (Rev-1)

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

the Government reserves the right to furnish a propeller to be installed in-place of the one removed. When the Government exercises this right, the Contractor shall turn over the removed propeller to the Coast Guard PA as a MTI item. If a Change Request has been authorized and released by the KO, the Contractor shall inspect the Government-furnished propeller, and submit a CFR including any additional work that may be required to install the new propeller to the existing shaft.

3.5.1 Propeller details. 44" dia x 50" pitch 5-blade Nickel

Aluminum Bronze propellers.

Page 25 (Rev-1)

24520L_FLT (20 Jun 2007) 75E WLR (05 Jan 2005)

WORK ITEM 7: Perform Minor Repairs and Reconditioning of Propeller

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to perform minor repairs and reconditioning of a designated propeller.

1.2 Government-furnished property.

None.

2. APPLICABLE DOCUMENTS

MIL-STD-167-1, Nov 2005, Mechanical Vibrations of Shipboard Equipment (Type I - Environmental and Type II - Internally Excited)

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

American Bureau of Shipping (ABS) 2, Rule Requirements for Survey After Construction, 2007, Part 7, Appendix Section 10, Guide for Bronze and Stainless Steel Propeller Castings

ASTM International (ASTM) D3951, Reapproved 2004, Standard Practice for Commercial Packaging

International Standard For Organization (ISO) 484/2, 1981, Shipbuilding - Ship Screw Propeller - Manufacturing tolerances - Part 2: Propellers of Diameter Between 0.80 and 2.50m, Inclusive

3. REQUIREMENTS

3.1 Related work item. The Contractor shall accomplish the

work specified herein in conjunction with "Remove, Inspect, and Reinstall Propellers", which is a separate work item in this specification package.

Page 26 (Rev-1)

3.2 Requirements for repairs and reconditioning. The

Contractor shall accomplish the following:

3.2.1 General requirements. Perform minor repair and

reconditioning tasks on the surfaces of the designated propeller, including threaded holes, in accordance with ABS-2, Part 7, Appendix Section 10, Subsection 1 (Bronze Propellers), for the conditions defined in 3.5.2 (Conditions for minor repair and reconditioning). In addition, perform straightening, welding, heat-treating, re-pitching, and stress-relieving, as necessary, to restore the propeller to a serviceable condition, as defined in section 3.5.6 (Serviceable condition). Ensure that removal and/or addition of material should be limited to the minimum necessary to accomplish the required repairs.

3.2.1.1 All propeller tolerances must conform to the Class I

standard specified in ISO 484/2.

3.2.2 Balancing. Perform single-plane balancing of both

reconditioned propeller and cap on rotational balancing equipment to ensure freedom from vibration in accordance with MIL-STD-167-1 for Type II (internally excited) vibration;

observe the following requirements:

3.2.2.1 Material removal. Remove material as evenly as

possible from over the entire blade surface (both suction and pressure faces) but not closer to the blade edges than 10 percent of the blade width, to prevent "thin spots" when balancing the propeller.

3.2.2.2 Addition of weight. Add weight to inside the propeller cap by welding, if necessary, to balance the cap, ensuring that the added material is clear of the propeller nut, the locking key, and the end of the propeller shaft.

3.2.2.3 Restrictions. Ensure that the maximum permissible

residual unbalance does not exceed the value determined by the following formulas for the speeds specified in table I below if no specific maximum permissible residual unbalance value provided by the Coast Guard Inspector.

TABLE I. Maximum permissible residual unbalance.

SPEED

(RPM) FORMULA

0 to 149 U = 0.177W 150 to 1,000 U = (400W)/(N x N) 1,000+ U = 4W/N

Page 27 (Rev-1)

Where U = Maximum allowable residual unbalance (ounce-inches) W = Weight of rotating part (pounds) N = Maximum operating speed (revolution/minute)

3.3 Post repair inspections. Upon completion of required

repairs and reconditioning, the Contractor shall accomplish the following inspections, and submit a CFR:

3.3.1 Measurements. Measure and record the propeller

dimensional tolerances, to ensure they match the requirement provided by the Coast Guard Inspector and ISO 484/2, Class I.

3.3.2 Nondestructive testing. The Contractor shall conduct

non-destructive inspection of all repaired areas, in accordance with Std Spec 0740_STD, Appendix C.

3.4 Post repair care and handling. Upon completion of all

repairs and inspections specified herein, the Contractor…