SOW - BEAR CPP OD Box Repair.docx

24511_0214_210_270 REC_24511_210_270_270’ WMEC ‘A’ Class (ALL) (1117) WORK ITEM 1: Controllable Pitch Propeller (CPP) Oil Distribution (OD) Box, Inspect and Service

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to inspect and service the Stbd CPP OD box.

1.2 Government-furnished property.

($/Unit)

2. REFERENCES

Coast Guard Drawings Coast Guard Drawing 901 WMEC 243-001, Rev L, Shafting Arrangement Coast Guard Drawing 901 WMEC 245-001, Rev E, CPCH Prop Hyd Sys Diag Coast Guard Drawing 901 WMEC 245-005, Rev -, C.P. - Propeller Coast Guard Drawing 901 WMEC 245-004, Rev E, Controllable Pitch Propeller Escher Wyss 270 ft WMEC Blade and Palm Coast Guard Drawing 901 WMEC 245-007, Rev B, Special Tools Coast Guard Drawing 901 WMEC 245-008, Rev D, Controllable Pitch Propeller Actuating Unit Type 300.3 GN Coast Guard Drawing 901 WMEC 245-009, Rev L, CPCH Prop Hyd Sys Diag Coast Guard Drawing 901 WMEC 245-013, Rev B, Pitch Actuator System Engagement Mechanisms, Links Shaft Clamps and Brackets Coast Guard Drawing 901 WMEC 245-014, Rev A, CPP System Pitch Setters Coast Guard Drawing 901 WMEC 245-015, Rev B, CPP System Pitch Setters Main Boards, Sub-Boards, Scales and Mechanical Stops Coast Guard Publications Coast Guard Technical Publication (TP) 2699, Mar 2006, Manufacturer’s Instruction Book – SWBS Group(s) 245 - 270’ WMEC “A” Class Cutters, Technical Manual for the Controllable-Pitch Propeller Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2022, General Requirements Surface Forces Logistics Center Standard Specification 5000 (SFLC Std Spec 5000), 2022, Auxiliary Machine Systems Other References ASTM International (ASTM) D4174, Re-approved 2010, Standard Practice for Cleaning, Flushing, and Purification of Petroleum Fluid Hydraulic Systems International Organization for Standardization (ISO) 4406, 2017, Hydraulic Fluid Power – Fluids – Method for Coding the Level of Contamination by Solid Particles – Third Edition

3. REQUIREMENTS

3.1 General.

3.1.1 CIR.

None.

3.1.2 Tech Rep. The Contractor must provide the services of a certified Tech Rep, who is familiar with the Escher-Wyss CPP system, to accomplish the following tasks – on site:

Provide information, software, and tools specific to the equipment/system.

Assist with proper repair methods, and ensure compliance with manufacturer's procedures and standards during disassembly, inspection, repair, modification, calibration, flushing, test and reassembly of the equipment/system.

3.1.2.1 Ensure that the Tech Rep has a resume of demonstrated experience with the system/equipment stated above.

3.1.2.2 Submit a copy of the Tech Rep’s résumé and a list of references to the to the COR at the Arrival Conference.

3.1.3 Protective measures, general. The Contractor must furnish and install all protective coverings to seal off and protect all non-affected vessel's components, equipment, and spaces near the work area against contamination during the performance of work. Upon completion of work, the Contractor must remove all installed protective measures, inspect for the presence of contamination, and return all contaminated equipment, components, and spaces to original condition of cleanliness.

3.1.3.1 Protective measures, hydraulic system(s). Maintain existing hydraulic system cleanliness and take all necessary precautions to prevent the introduction of contaminants into the hydraulic system. Immediately after disconnecting or removing components from the hydraulic system, seal all openings to the rest of the system using caps for externally threaded connection points, bolt-on blanks, or taped-on discs/covers made of durable plastic or sheet-metal that is no less than 1/16-inch thick.

NOTE

Be aware that plastic bags may be used only when arrangement or configuration prevents the use of the other sealing methods specified above.

3.1.4 Interferences. The Contractor must handle all interferences in accordance with SFLC Std Spec 0000, paragraph 3.3.5 (Interferences). Known interferences include, but are not limited to the below-listed:

· CPP hydraulic system

· CPP hub and shafting system.

3.1.5 Hydraulic fluid sampling and testing. Prior to and immediately following the work herein, the Contractor must sample and test the system hydraulic fluid in accordance with SFLC Std Spec 5000, Appendix C, Paragraph C2.1 (Fluids). Submit a CFR.

note Coast Guard personnel will operate all shipboard machinery and equipment.

Stbd CPP is known to be malfunctioning. See Condition Found Report previously submitted for needed repairs. Obtain report from COR.

3.1.6 Operational test, initial. Prior to commencement of work, the Contractor must witness Coast Guard personnel perform an initial operational test of all items or shipboard devices to be disturbed, used, repaired, or altered, to demonstrate existing operational condition. Submit a CFR.

3.1.7 Actuating Unit/OD Box/Servo Box fluid drainage and disposal. As necessary, the Contractor must drain all hydraulic oil from the stbd CPP Actuating Unit and OD Box into a suitable container; dispose of removed fluids in accordance with all applicable Federal, state and local regulations.

3.1.7.1 Prior to draining, the Contractor must verify with the Coast Guard Inspector that the oil is to be disposed of, and not reused.

3.1.7.2 If a Change Request is released and approved by the KO to reuse or further test the removed oil, the Contractor must ensure all hoses and containers used for removal and storage are clean and free from dirt, contaminants and moisture prior to use. Submit a CFR stipulating cleanliness. (See Section 4.)

NOTE

See Condition Found Report previously submitted for needed repairs. Obtain report from COR.

3.2 CPP Actuating Unit and OD/Servo Box service particulars. The Contractor must accomplish all work specified herein under the supervision of the Tech Rep for the stbd CPP actuating unit and the oil distribution (OD)/servo box, using the Coast Guard drawings referenced in Section 2 and TP 2699 for guidance in accomplishing this work. The Contractor must accomplish the following tasks for the actuating unit and the oil distribution (OD) box:

3.2.1 Disassemble and clean all interior and exterior surfaces free of all surface contaminants. Clean the interior surfaces of the stbd OD box free of all dirt, rust, and all other surface contaminants, using lint-free rags.

3.2.2 Visually inspect all components for signs of wear and deterioration. Measure all machined parts and critical dimensions against manufacturer’s specifications. Submit a CIR.

3.2.3 After completion of authorized repairs, reassemble and reinstall stbd actuating unit and OD box using the Government-furnished parts and the OD/Servo Box inspection kit (contains o-rings, gaskets and snap rings) listed in Section 1.2.

3.2.4 Coat the interior OD box surfaces with new oil in accordance with referenced TP.

3.3 Re-servicing of CPP oil systems. After all authorized repairs, the Contractor must replenish the stbd CPP system with hydraulic oil conforming to manufacturer’s recommendations to top-off the fluid levels, filtered through a 10-micron absolute, non-bypass type filter designed specifically for filtering oils and other lubricants. The Contractor must ensure all hoses and containers used are clean and free from dirt, contaminants and moisture prior to use. Submit a CFR stipulating cleanliness. (See Section 4.)

3.3.1 Hydraulic pump. When hydraulic levels are correct, put the main hydraulic pump on line.

NOTE

Vent system by opening the filter gauge ports.

3.3.2 Pitch system. Cycle pitch system ahead and astern twice.

3.3.3 Repeat cycle with other hydraulic pump. After thirty minutes, start the other hydraulic pump and cycle the pitch ahead and astern again.

NOTE

Each system should be completely void of air after cycling; oil level must be monitored after the shaft is rotated. If turning the shaft releases more air, more oil must be added to the system.

3.4 Positioning and control adjustments. The Contractor must plan for and allow Ship’s Force up to 2 days to conduct a CPP control console system groom.

Note Coast Guard personnel will operate all shipboard machinery and equipment.

3.5 Operational test, post repairs. After completion of work, the Contractor must thoroughly test, in the presence of the Coast Guard Inspector and demonstrate all items or shipboard devices that have been disturbed, used, repaired, altered, or installed to be in satisfactory operating condition and then repeat the requirements of paragraph 3.1.8.1 (Pitch checks). Submit a CFR.

3.5.1 Hydraulic Filters and Strainers. Make a check of differential pressure indicators on the filters and strainers for clogged conditions. When the discharge filter differential pressure gauge reads in excess of 50 psid, its filtering element is in need of cleaning. When the suction filter telltale indicator enters the red zone, its element needs to be clean. Both filters allow change over to alternate filtering elements without interrupting system operation.

3.5.2 Hydraulic Oil Temperature. The oil temperature range during operation of the CPP system should be between 105°F and 135°F. This reading is taken from the thermometer at the inlet side of the oil cooler.

3.5.3 Oil Sump Tank. Check and record sump tank level.

3.5.4 Air in the system. Check sight gauge on head tank for indication of air. Oil should be clear. IF there is air in the system, oil will be clouded and frothy.

3.5.5 Actuating Unit Seal. Check sight glass in connection piping from the actuating unit. Ensure a small oil flow through the unit housing seal to relieve the pressure on the oil retainer ring. High oil flow indicates the pressure on the retainer ring is too high.

3.5.6 Sump Tank Oil Sample. Extract one pint of oil from each CPP return line. Test samples for water or other impurities.

3.5.7 Pitch Change Rate. Measure and record time for blades to pitch from full ahead to full astern with two CPP hydraulic pumps on. Time should be approximately 20 seconds or less.

3.5.8. Pitch drift. Set pitch to Full ahead. Once pitch is met, ensure pitch does not drift astern.

NOTE

Coast Guard personnel will operate all shipboard machinery and equipment.

4. NOTES

4.1 Coast Guard Inspector responsibilities. The Coast Guard Inspector will be responsible for the following:

4.1.1 Visually verify the presence of protective coverings each and every time the hydraulic system is opened and exposed to potential contamination. The Coast Guard Inspector will initial and date as verified the CFR provided by the Contractor, detailing protective measures taken.

4.1.2 Visually verify tank cleanliness prior to closure (if applicable).

4.1.3 Visually verify cleanliness of all hoses and containers used for removal and installation of fluids.

4.1.4 Confirm all above verifications in writing on CFR provided by Contractor.

4.2 Place of Performance: CGC Bear (WMEC-901)

4000 Coast Guard Blvd Portsmouth, VA, 23703

4.3 Period of Performance: 16 September 2026 – 30 September 2026