SOW_CGC TAMPA_PROP BLADE BOLTS_REV0.pdf

Statement of Work: USCGC TAMPA Stbd Controllable Pitch Propeller (CPP) Blade Bolts, Renew In-Water

1. SCOPE

1.1 Intent. This Statement of Work describes the requirements for the Contractor to renew all six blade bolts on a single blade on the stbd Controllable Pitch Propeller (CPP), to include extraction of one broken bolt, and flush the CPP hydraulic system.

1.2 Government-furnished property.

MTI ITEM DESCRIPTION NSN/PN QTY ESTIMATED COST

($/UNIT)

N Bolt, Shoulder NSN: 5306-01-118-8337 2 ea. 2,139.00 N Bolt, Shoulder, Blade NSN: 5306-01-119-3607 4 ea. 1,523.00 N Blade Washer NSN: 5310-01-335-4361 48 ea. 213.00 N Hydraulic fluid, 2135TH per MIL-PRF-17672 NSN: 9150-00-584-2560 5 dr. 1,619.00

2. REFERENCES

COAST GUARD DRAWINGS

Coast Guard Drawing 901 WMEC 245-001, Rev E, CPCH Prop Hyd Sys Diag

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 245-005, Rev -, C.P. - Propeller

COAST GUARD PUBLICATIONS

Coast Guard Technical Publication (TP) 2699, SWBS 245, Section A, Feb 2018, Controllable Pitch Propeller System

Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2022, General Requirements

Surface Forces Logistics Center Standard Specification 0740 (SFLC Std Spec 0740), 2022, Welding and Allied Processes

Surface Forces Logistics Center Standard Specification 5000 (SFLC Std Spec 5000), 2022, Auxiliary Machinery Systems

OTHER REFERENCES

Code of Federal Regulations (CFR) Title 29, Part 1910, Subpart T, 2007, Commercial Diving Operations

International Standard Organization (ISO) 4406, 2017, Hydraulic Fluid Power – Fluids – Method for Coding the Level of Contamination by Solid Particles – Third Edition

MIL-PRF-17672E, Oct 2012, Hydraulic Fluid, Petroleum, Inhibited

3. REQUIREMENTS

3.1 General. The Contractor shall refer to the Coast Guard drawings and TP listed under Section 2 (References) as guidance in accomplishing this work item.

3.1.1 CIR.

None.

3.1.2 Tech Rep.

None.

3.1.3 Protective measures. The Contractor must furnish and install all protective measures in accordance with SFLC Std Spec 0000, (Vessel component, space, and equipment protection).

3.1.3.1 Hydraulic system contamination protection. The Contractor must maintain existing hydraulic cleanliness in accordance with SFLC Std. Spec 5000.

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

Underwater location.

NOTE

At Contractor’s request, Ship’s force will secure and tag out the main engines, steering gear, generator set, A/C unit, and all other machinery that may cause a hazard while a diver is in the water.

3.1.5 The Contractor must provide the Coast Guard Inspector 24 hours advance notice of dive operations.

Before diving procedures commence, meet with the Coast Guard Inspector, to discuss diving safety requirements and the securing of cutter machinery, as applicable.

NOTE

Prior to beginning work, isolate the stbd CPP hydraulic system with the assistance of Ship’s Force.

3.1.6 The Contractor must provide oil containment measures to contain and collect any residual hydraulic fluid leakage.

3.2 Pre-diving clearance. The Contractor must ensure that the diving team obtains clearance from the Officer-of-the-Deck before beginning diving operations.

3.2.1 The Contractor must ensure the Coast Guard Inspector has capability for maintaining continuous two-way communication with diving personnel at all times, during the performance of this Statement of Work.

3.2.2 The Contractor must, in accordance with 29 CFR 1910.401-440, provide certified divers and a tender team, as well as necessary support personnel and equipment, to accomplish the tasks specified herein.

3.3 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.

3.4 Propeller blade bolts, renewal. The Contractor must accomplish the following for a stbd propeller blade using TP-2699 and Coast Guard Drawings 901 WMEC 245-004 and 901 WMEC 245-005 as guidance:

3.4.1 Locate the blade with the failed bolt on the stbd CPP hub. Renew the 6 blade bolts and washers using Government Furnished Material for this blade.

3.4.1.1 Extract the broken bolt,and turn over the extracted shank and the broken bolt head to the Coast Guard Inspector. Turn over the remaining 5 blade bolts to the Coast Guard Inspector.

NOTE

Bolts will be at their proper torque value when the elongation measuring tool indicates an elongation of 0.002” (+0.001” / -0.000”) for bolt 59 and 0.003” (+0.003” / -0.000”) for bolt 41.

3.4.1.2 Replace bolts one at time, in a criss-cross pattern. Note that there are 2 different lengths (4 shorter and 2 longer). Tighten blade bolts using TP 2699 and Coast Guard Drawing 901 WMEC 245-005 (see note above) as guidance. Estimated blade bolt torque value for required bolt stretch is 2100 ft lbs.

3.4.2 Weld locking bars to the bolt heads in accordance with Coast Guard Drawing 901 WMEC 245-005.

Welding must be accomplished in accordance with requirements of SFLC Std Spec 0740.

3.4.3 Furnish and install the M12 x 12 stainless steel plugs for the blade bolts.

NOTE

Coast Guard personnel will operate all shipboard machinery and equipment.

NOTE

Operating the hydraulic system is not sufficient to flush the hub and shafting;

the hub purge procedure must be used. Cutter personnel ensure that Waste Oil Tank can accommodate approximately 150 gallons of waste hydraulic fluid.

3.5 Hub purge. The Contractor must accomplish the hub purge procedure for the stbd CPP hub in accordance with TP 2699 Section 4-6.B and using Coast Guard Drawing 901 WMEC 245-001 as guidance.

3.6 Operational test, post repairs. After completion of work, the Contractor must thoroughly test, in the presence of the Coast Guard Inspector and demonstrate the CPP system to be in satisfactory operating condition. Submit a CFR.

Pitch change rate: Elapsed time between pitch stop limits must be 20 seconds +/- 3 seconds

Hydraulic oil temp: Temperature must be between 105°F and 135°F. This reading is taken from the thermometer at the inlet side of the oil cooler.

Pitch drift: Set pitch to Full ahead. Once pitch is met, pitch must not drift astern.

Check pointer attached to command input shaft for actuating unit. Ensure pointer lines up with "0" mark on the scale while the blades are at "0" pitch marks on the hub

3.6.1 Leak test. Perform leak test of fully assembled system in accordance with TP 2699 Section 8-3 Paragraph C.8. Verify no leaks from the CPP hub.

NOTE

In the absence of manufacturer’s specifications, hydraulic fluid with a particulate count of -/18/15 or better (per ISO 4406) and a water content no greater than 500 ppm (0.05% by volume) is acceptable.

3.7 Hydraulic system sampling. Following the work herein, the Contractor shall sample and test the system hydraulic fluid in accordance with SFLC Std Spec 5000, Appendix C, Paragraph C2.1 (Fluids).

Submit CFR.

3.8 Re-servicing of CPP oil systems. After all authorized repairs, the Contractor shall replenish the system with hydraulic oil conforming to MIL-PRF-17672, Symbol 2135 TH, filtered, through a 10-micron absolute, non-bypass type filter designed specifically for filtering oils and other lubricants.

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.

4. NOTES

4.1 Disposition of removed bolts. For USCG: The Coast Guard Inspector must turn over the bolts received in paragraph 3.4.1.1 to the MECPL Asset Management Section. Asset Manager must submit the broken bolt to a qualified laboratory for a failure analysis, and one of the remaining 5 bolts for RT inspection.

4.2 Period of Performance. Requested work be conducted during a 1-week period to commence on 15DEC25 and end by close of business (COB) 19DEC25 at the following location.

USCGC TAMPA (WMEC 902), 4000 Coast Guard Blvd, Portsmouth, VA 23703

4.3 Point of Contact. LT Nicholas Paisker, Engineering Officer (EO), Nicholas.C.Paisker@uscg.mil, 757- 483-8710