0907_A__PROPELLER_POLISHING_REPAIR.doc

USNS SIOUX (T-ATF 171)

DRYDOCKING

RFP NO. N32205-18-R-4553

ITEM NO. 0907

CATEGORY "A"

October 2017 Propeller Polishing and Repairs

MSC/Abrams/L

1.0 ABSTRACT:

1.1 This item describes the requirements for the contractor to polish the ship's propellers.

2.0 REFERENCES: None.

3.0 ITEM LOCATION/DESCRIPTION:

3.1 Location/Quantity

3.1.1. Location: Aft, Frame 100.

3.1.2. Quantity: Two (2) propellers

3.2 Item Description/Manufacturer's Data

3.2.1. The propellers are the four blade stainless steel controllable reversible pitch type. The propeller is built upon a hollow hub of stainless steel. The forward end of the hub is flange connected to the propeller shaft with twelve (12) bolts. Each propeller has the following characteristics:

Number of blades: four (4)

Surface area: 164.5 sq. ft.

Diameter: 9 feet.

3.2.2. Manufacturer's Data

Mfr: Propulsion Systems, Inc., New York

Mfg. Dwg: F-20743 Rev. E MSC# (6247450)

Mfg. Code: I.D. No. 27046

Mfg. Descr: Propeller Blade - RH Model E85/4

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICES/INFO:

4.1 Government Furnished Equipment (GFE): None.

4.2 Government Furnished Material (GFM): None.

4.3 Government Furnished Services (GFS): None

4.4 Contractor Furnish Services (CFS):

4.4.1 OEM Tech Rep

4.5 Government Furnished Information (GFI).

4.5.1. Enclosure 1. Navy Standard Fouling Ratings.

4.5.2. Enclosure 2. Fouling rating Description.

4.5.3. Enclosure 3. Cleaning/Polishing Marks Diagram.

4.5.4. Enclosure 4. Propeller Inspection: Surface Roughness (Before/After Polishing).

4.5.5. Enclosure 5. Polished Propeller, Surface (Roughness Requirements Diagram).

4.5.6. Enclosure 6. Docking Report (NAVSHIP RPT 9070-2).

5.0 NOTES:

5.1 The contractor and all subcontractors, regardless of tier must consult the General Technical Requirements (GTR) to determine applicability to this work item. In performance of this work item, the contractor and all subcontractors must comply with all applicable GTR’s including but not limited to GTR’s 1 through 7 and 24.

5.2 The contractor and all subcontractors regardless of their tier are advised to review other work items under this contract, to determine their effect on the work required under this work item. Many of the definitions relating to performance of this work item are found in Work Item 0001.

5.3 All dirt, debris, and liquids resulting from this work shall be removed from the ship daily and all areas involved left clean.

5.4 This work item and report should be conducted with WI 0918.

6.0 QUALITY ASSURANCE REQUIREMENTS: Refer to item 0004

7.0 STATEMENT OF WORK:

7.1 Arrangement/Outfitting:

7.1.1 Blade seal area must be taped off and or covered prior to polishing as to not cause damage to the seal.

7.2 Structural: None

7.3 Mechanical/Fluid:

7.3.1. Visually inspect the propeller(s) prior to cleaning or polishing. Complete and submit a propeller inspection visual report that includes, a minimum, the information shown in Enclosure 1 for both pressure and suction faces of all blades. Use Standard Navy Fouling Ratings (FR) as given in Enclosure 2.

7.3.2. Clean entire propeller, including hub, fillets, and blades, free of surface fouling, using sanding discs or high pressure water. Use of grinding or abrasive stones for cleaning or polishing the propeller(s) is NOT permitted. Care should be taken to minimize loss of propeller material. Sanding disc marks should lie in the direction of water flow (see Enclosure 3).

7.3.3. Complete and submit a propeller inspection Surface Roughness Report (Enclosure 4) indicating the after cleaning and before polishing roughness of all blades, both pressure and suction faces.

7.3.4. Perform a dye penetrant inspection on at least a three-inch band of the leading and trailing edges, both pressure and suction faces, of each blade of each propeller. Also, perform a dye penetrant inspection on all fillet areas. Submit a report that clearly identifies the location and size of all indications and includes a record of the hub stamping.

7.3.5. After completion of all propeller repairs, polish the propeller(s) using “Scotch Brite" 3-M surface conditioning discs, or equal. Use of grinding or abrasive stones for cleaning or polishing the propeller(s) is NOT permitted. Polish the pressure and suction surfaces of each blade tip between 0.7 and 1.0 radius to an equivalent of Rupert "A" (approx. 26 micro inch Ra.). Polish the leading edge (approx. 20% of the blade width, on the pressure and suction faces) of each blade to an equivalent of Rupert "A". Polish the remainder of the propeller to at least an equivalent to Rupert "B" (approx. 76 micro inches Ra.). See Enclosure (5). Either a tactile comparison gauges (Rupert) or an electronic profilmeter (micro inch) must be used to determine surface roughness.

7.3.6. Prepare and submit a Propeller Inspection: Surface Roughness Report (Enclosure 4) stating final blade surface finish for all the blades, both suction and pressure faces. At least ten readings are to be taken for each blade surface using either a tactile comparison gauge (Rupert) or electronic profile meter (micro inch). The readings should be 0.7 and 0.9, taken as follows: three at each radius of 0.3, and one at the tip. Take clearance readings on the blade palms as directed by the CPP technical representative. If repairs/replacement are made; contractor must submit to the MSCREP enclosure 6 properly filled out and a detail report when necessary on condition and repairs must be entered on the reverse side of the enclosure.

7.3.7. Completely cover the propeller during the entire dry dock period to protect surface from paint spray and damage.

7.4 Electrical: None.

7.5 Electronics: None.

7.6 Preparation of Drawings: None.

7.7 Inspection/Test

7.7.1. Notify the MSC Representative in accordance with Item 0004.

7.7.2. The MSCREP and OEM Tech Rep will inspect seal area covering prior to work commencement.

7.7.3. The MSC Representative will witness the roughness measurements. Areas of the propeller not meeting the requirements of Paragraph 7.3.3 must be re-polished.

7.8 Painting: None

7.9 Marking: None

7.10 Manufacturer's Representative: None

8.0 GENERAL REQUIREMENTS: None additional.

NewPengCons

22765

0907-1

_1587708137.pdf

CLASSIFICATION

SMALL

PITTING

CRACK

DIAMETER LAST INSPECTION DATE

HEAVY

EROSION

NO. OF BLADES (ADAPT SKETCH TO BELOW TO SUIT) APPROXIMATE DIMENSIONS OF DAMAGE

INSPECTION SOCITEY STAMP ON KEYWAY BETWEEN BLADE ROUGHNESS OR ERODED AREAS IN MICRONS USING RUBERT

COMPARATOR

INSPECTED BY (SIGNATURE)

% OF AREA FOULED ANDAPPROXIMATE THICKNESS

RESULTS OF INITIAL PROPELLER INSPECTION*

BLADE NUMBER 1 2 3 4

MAXIMUM

ROUGHNESS

SHADED

UNSHADED

AVERAGE

ROUGHNESS

SHADED

UNSHADED

* USE STANDARD NAVY FOULING RATING (FR) ENCLOSURE 1

NAVY STANDARD FOULING RATINGS

FOULING RATINGS (FR) IN ORDER OF INCREASING SEVERITY

Fouling

Rating

(FR) Description

0 A clean, foul-free surface, red AF paint (for a ship just out of drydock).

10 Continuous graduations of shades of red and green (incipient slime).

20 Slime as dark green patches with yellow or brown colored areas

(advanced slime).

30 Grass as filaments up to 3 inches (76 mm) in length, projections up to ¼ inch (6.4mm) in height; or a flat network of filaments, green, yellow or brown in color.

40 Calcareous fouling on edges, welded seams, corners, or as discrete patches covering flat areas roughly 9 to 10 inches (229 to 254 mm) in diameter.

50 Random and scattered tubeworms or barnacles (or both) on slightly curved or flat surfaces.

60 Area distribution of tubeworms or barnacles, ¼ inch (6.4 mm) in diameter or less; fouling does not completely cover or blank out surface.

70 Tubeworms and barnacles completely cover surface in patches exceeding 9 to 10 inches (229 to 254 mm) in diameter.

Tubeworms lying flat with radiating fringes of growth or barnacles

¼ inch (6.4 mm) in diameter or less.

80 Tubeworms closely packed together and growing upright away from surface. Barnacles growing one on top of another.

Calcareous shells appear clean or white in color.

90 Dense growth of tubeworms with barnacles ¼ inch (6.4 mm) or greater. Calcareous shells brown in color with slime or grass overlay.

100 All forms of fouling present, particularly soft sedentary animals without calcareous covering (tunicates).

ENCLOSURE 2

CLEANING / POLISHING MARKS DIAGRAM

ENCLOSURE 3

PROPELLER INSPECTION: SURFACE ROUGHNESS

NAME OF ONTRACOTR AND LOCATION

MANHOURS EXPENDED FINAL SMOOTHNESS ACHIEVED

SHADED UNSHADED

COMMENTS AND RECOMMENDED FUTURE WORK

(BEFORE / AFTER POLISHING)

RESULTS OF SURFACE ROUGHNESS INSPECTION *

BLADE NUMBER 1 2 3 4

TIP

0.9 RADIUS

0.7 RADIUS

0.3 RADIUS

* INDICATE LOCATION OF EACH READING ON ABOVE DIAGRAM

ENCLOSURE 4

EQUIVALENT ROUGHNESS

RUBERT SCALE A B C D E

MICROINCHES 26 76 186 328 741

MICROMETERS 0.65 1.92 4.70 8.24 18.5

POLISHED PROPELLER SURFACE

ROUGHNESS REQUIREMENTS DIAGRAM

(ALL BLADES, PRESSURE AND SUCTION FACES)

ENCLOSURE 5

DOCKING REPORT NAVSHIPS RPT. 9070-2

PROPELLER

NAVSHIPS 9070/2 (REV. 1.67) (FORMERLY NAVSHIPS PS 223.4) S/N 0105-631-5100 DOCKING DATE

SUBMITTED BY ALL SHIPYARDS AND STATIONS FOR ALL CLASSES OF SHIPS WHEN REPAIRS/REPLACEMENTS ARE MADE

PROPELLERS SHAFT LOCATION

STARBOARD PORT CENTER

A S

F O

U N

D

NUMBER OF BLADES OUTBOARD NO.1 INBOARD NO. 2 INBOARD NO. 3 OUTBOARD NO. 4

SERIAL NO.

DRAWING NO.

TYPE MATERIAL

CONDITION *

S

R E

P L

C

E D

NUMBER OF BLADES

SERIAL NO.

DRAWING NO.

TYPE MATERIAL

CONDITION *

* Detailed report when necessary on condition and repairs to be entered on reverse side of this sheet, supplemented with sketches and photographs. (USE NAVSHIPS 9070/3 FOR DETACHABLE BLADE PROPELLERS)

SOLID PROPELLER (HUB) DATA DETACHABLE

SERIAL

NUMBER

DRAWING NUMBER SHIP

SUITABILITY

SHAFT

SUITABILITY DIAMETER PITCH MANUFACTURER

CONTRACT OR JOB

NO. WEIGHT

SUBMIT PITCH MEASUREMENTS FOR PROPELLERS WHERE INFORMATION IS MISSING OR REQUESTED.

FORM NAVSHIPS 420 (PAGES 1-7) ARE FORWARDED HEREWITH FOR SERIAL NUMBERS:

SKETCH OF DAMAGE OR LOCATION OF CAVITATION PITTING ( IF ANY)

SHAFT NO. CHECK SHAFT NO. CHECK SHAFT NO. CHECK SHAFT NO. CHECK

1. TYPICAL BLADE, ALL ALIKE 1. TYPICAL BLADE, ALL ALIKE 1. TYPICAL BLADE, ALL ALIKE 1. TYPICAL BLADE, ALL ALIKE

2. ONLY ONE BLADE NO. ______ 2. ONLY ONE BLADE NO. ______ 2. ONLY ONE BLADE NO. ______ 2. ONLY ONE BLADE NO. ______

3. SUCTION BACK 3. SUCTION BACK 3. SUCTION BACK 3. SUCTION BACK

4. PRESSURE FACE 4. PRESSURE FACE 4. PRESSURE FACE 4. PRESSURE FACE

5. HUB

TRAILING

EDGE

LEADING

Serial No._ _ _ _ _ _ _ _ Serial No._ _ _ _ _ _ _ _ Serial No._ _ _ _ _ _ _ _ Serial No._ _ _ _ _ _ _ _

SIGNATURE REPORTING ACTIVITY NAME, CLASS, AND NUMBER OF VESSEL

ENCLOSURE 6