SOW - PROP CLEANING.pdf

29 April 2020

Statement of Work

NSN 2S 2010-01-047-5422 P2

Propeller SN 29056

References:

(a) Technical Data Package

(b) NAVSEA S9245-AQ-TSM-010/PROP

(c) NSWC letter Ser 932/104 dtd 9 Sep 08, Submarine Propeller Piece X Repair Patch and Mechanical

Fastener Installation Requirements

(d) NSWC letter Ser 932/088 dtd 22 Jul 08, Void Repair Requirements

Perform an engineered repair of SSN 688 Class propeller SN 29056 and associated propeller device at Sub Base New London in accordance with References (a) through (d), as applicable. The contractor shall provide all necessary tooling, equipment, and personnel for the inspection and repair of the propeller. Overtime shall be worked as required to meet the existing delivery schedule. Only the following inspections and repairs shall be accomplished in accordance with the requirements of Reference (a) except as modified herein.

ITEM 0002, Clean and Inspect Propeller and Device

1. Clean the propeller and associated propeller device.

2. Perform a dye penetrant aided Visual Technical Inspection (VTI) of the propeller.

3. Perform a dye penetrant aided limited VTI of the hydrodynamic surfaces of the propeller device to identify and document cracks only.

Shipment: The propeller and device shall be shipped in place.

SCHEDULE for ITEM 0002: Personnel performing cleaning and inspection must be available for performance of all required work seven (7) days a week, approximately 10 hours daily until work is complete, approximately 4 days for ITEM 0002.

The contractor shall provide the VTI report to a PNSY Engineering Representative whom is a qualified propeller visual technical inspector for government review. The VTI shall be submitted to NSWCPD 426/NAVSEA 05P3 within four (4) hours of review by the PNSY engineering representative.

Delivery Date: TBD

ITEM 0004, PROPELLER REPAIR

Repairs shall be in accordance with Reference (a) and as noted herein. Repairs shall not begin prior to authorization from NAVSEA 05P3 or NSWCPD 426. In the event that not all repairs can be completed in the time available, items 1 through 8 are listed in priority order. The contractor shall work to complete as many of the below repairs as possible. Note that items 9 through 12 are required.

1. Repair leading and trailing edges to repair tolerances using edge gages as a guide.

2. Repair cracks visible on the surface of blade by welding. Repair determination of cracks in special attributes will be provided by NAVSEA 05P3/NSWCPLD 426 based upon the VTI report results.

NOTE: Ultrasonic testing shall be performed prior to weld repair of special attributes. The entire length of subsurface cracks shall be excavated prior to weld repair. MIL-CuAI-A2 weld filler material is authorized and shall be used for welds associated with the repair of special attributes. UT shall be performed with a transducer size of 0.250 inch at a frequency of 5 MHz.

CAUTION: The special temperature limitation of Reference (b) may be exceeded to a maximum temperature of 400 degrees F adjacent to replaced post welds and 300 degrees F for peripheral welds.

These temperature limits shall be strictly adhered to for piece 16 and the base casting in the area adjacent to piece 16 for all welding operations.

3. Repair failed or cracked post welds in accordance with Reference (c).

NOTE: Ultrasonic testing shall be performed prior to weld repair of special attributes. The entire length of subsurface cracks shall be excavated prior to weld repair. MIL-CuAI-A2 weld filler material is authorized and shall be used for welds associated with the repair of special attributes. UT shall be performed with a transducer size of 0.250 inch at a frequency of 5 M^Hz.

4. Repair all defects on the exterior hub surfaces in way of the o-ring sealing surfaces that exceed the VTI acceptance criteria.

5. Repair porosity to meet the special edge condition limits for Class 1 propellers.

6. Fill all voids to meet repair tolerance in accordance with Reference (d). Following cure of the CD 45, existing fill and vent holes shall have epoxy or Beizona plugs removed and replaced in accordance with Reference (d).

7. Repair out of tolerance fairing rod deviations to meet repair tolerances. Grinding on piece 16 is prohibited.

8. Restore hub surface finish to meet repair tolerances.

9. Perform a dye penetrant-aided VTI after all repairs are complete.

10. Upon completion of repairs, re-stamp existing hub markings and add the following stamped markings:

"ENG REP, ‘CONTRACTOR NAME’, DATE".

11. Apply preservative to the propeller in accordance with NSTM Chapter 245, paragraph 245-3.3.1.

12. Install propeller blade edge guards in accordance with MIL-DTL-2845-E, paragraph 3.14.1.4.:

a. Two (2) layers of 8 ounce minimum canvas to all blade edges; and

b. 0.1875inch cloth reinforced rubber to the tip region; and

c. Edge guards with a minimum of four zip ties on each blade face. Edge guards shall be installed prior to propeller installation and remain installed until the device is installed.

Shipment: The propeller shall be shipped in place.

SCHEDULE for ITEM 0004: Personnel performing repairs must be available for performance of all required work seven (7) days a week, approximately 10 hours daily until work is complete, approximately 7 days for ITEM 0004.

I

Following completion of repairs and review of the VTI by a PNSY Engineering Representative whom is a qualified propeller visual technical inspector, all reports shall be forwarded to the contractor’s DCMA QAR for inspection (CQA) and acceptance.

Delivery Date: 18 May 2018

ITEM 0006, DATA

Data shall be in accordance with CDRL 003.

Data for Item 0002 shall consist of the following:

a. Report for the VTI inspection, including Non-Destructive Test (NDT) results

b. Report for the limited VTI inspection, including NDT results, of the propeller device

Inspection (CQA) and acceptance of data for ITEM 0002 shall be completed by the contractor’s DCMA QAR. Copies of all data shall be forwarded to NAVSUP WSS and NSWCPD 426 following acceptance.

Data for item 0004 shall consist of the report for the VTI inspection, including NDT results, and a weld report for any weld repairs necessary. Weld repairs performed with Mil-CuAI-A2 shall be specifically identified in the weld report.

Inspection (CQA) and acceptance of data for ITEM 0004 shall be completed by the contractor’s DCMA QAR. Copies of all data shall be forwarded to NAVSUP WSS and NSWCPD 426 following acceptance.

Estimated Cost: Not separately priced

Delivery Date: TBD

The following will be provided by the shipyard to the contractor:

1. An enclosure or building with a minimum of four (4) feet of clearance between any point on the propeller and the structure. The enclosure or building must meet the security requirements specified in (was OPNAVINST S5513.5B, now SCG ID# 05-056.4). The enclosure or building shall provide adequate heat and or air circulation.

2. Electrical power at 110 & 220VAC, compressed air at 160 CFM correlating to 90 to 120 psi at the pneumatic tool fitting, and lighting as necessary.

3. Security in accordance with (was OPNAVINST S5513.5B, now SCG ID# 05-056.4) at all times including, but not limited to, propeller repair, propeller transit, and propeller rotation from pressure to suction face.

4. Required eyebolt plugs will be removed prior the arrival of the contractor.

5. Staging, as necessary, surrounding the propeller to provide a stable working surface which allows access to all points on the propeller and provides fall protection.

6. A fire extinguisher upon request of the contractor.

7. Trash, industrial waste, mechanical/grinding particles, etc. removal, as collected by the contractor.

8. A 24 hr engineering POC.

9. Vehicle access to the CIA and parking in the vicinity of where the propeller is staged.

The contractor shall provide/maintain the following:

1.12hrs notice to the shipyard for propeller handling services.

2. A minimum of 12hrs notice to the shipyard if support is required.

3. Propeller security per (was OPNAVINST S5513.5B, now SCG ID# 05-056.4) as originated by the shipyard.

4. Sufficient documentation of US citizenship and security clearance for entrance to the CIA.

5. A 24-hour supervisory point of contact.

6. The shipyard’s safety requirements, inciuding but not limited to safety shoes, eye protection with side shields, hearing protection, and hardhats.

7. Work site cleanliness in the highest reasonable state including the collection of trash, industrial waste, mechanical/grinding particles, etc., at least once every shift, to be removed by the shipyard.