Sequoia Seal SOW.docx

Statement Of Work Sequoia Tech Rep Services for Shaft Seals

PR# 2123403Y6172M7301

SCOPE

Contractor shall provide on-site tech rep services for the CGC Sequoia located at the USCG Yard in Baltimore Maryland 21226 on or around 11/20/23. POC: James, Johnston

Intent. Contractor to renew the inflatable seal and to inspect, overhaul, and adjust the mechanical seal. The propulsion shaft seal is an inboard 18.000-inch Type MB Seal manufactured by Wartsila-Lips.

Contractor shall provide the services of a qualified Tech Rep, who is familiar with the GFE, provide shaft seal system equipment/system system/equipment, to do the following, on site:

Advise on manufacturer's proprietary information pertinent to the system.

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

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

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

The Tech Rep will bring vulcanizing equipment to install the inflatable seal.

Major Overhaul Kit. The Major Overhaul Kit provided as GFP (Part # JCL00169-00 Rev C.) consists of the following components:

Seal Reassembly.

Seal Parts Preparation – The Contractor shall unpack and disassemble the seal parts in accordance with CG Tech Pub 3524-243-A.

The Contractor shall prepare the shaft liner and mounting flange in accordance with CG Tech Pub 3524-243-A.

Seal Installation – Technical Representative, the Contractor shall install the inflatable seal in accordance with Chapter 4 of CG Tech Pub 3524-243-A. Ensure that all bolts are torqued correctly in accordance with the manufacturer’s instructions.

Seal Assembly – The Contractor shall assemble the seal in accordance with Chapter 4 of CG Tech Pub 3524-243-A. Ensure that inflatable seal cavity and all butt joints are clean and butted smoothly together.

Face Carrier Assembly – The Contractor shall assemble the face carrier in accordance with Chapter 4 of CG Tech Pub 3524-243-A. Ensure that butts of face carrier are clean, butted smoothly together, and free of nicks and burrs.

Bellows Assembly – The Contractor shall assemble the bellows in accordance with Chapter 4 of CG Tech Pub 3524-243-A.

Face Insert Installation – The Contractor shall install the face insert in accordance with Chapter 4 and 7.2 (c) of CG Tech Pub 3524-243-A. Renew and/or machine parts in accordance with the guidance in the technical manual.

The Contractor shall reassemble the seal in accordance with Chapters 4 and 7.2 (c) in CG Tech Pub 3524-243-A. As necessary, install new parts in accordance with the manufacturer’s instructions using the materials in the Government Furnished seal replacement kits. Machine the seat face in accordance with paragraph 7.2 (c) in CG Tech Pub 3524-243-A. Verify the proposed maximum cut with the CG Inspector prior to machining. Stow unused new parts as directed by the CG Inspector.

Setting Seal Compression – The Contractor shall, in the presence of the Coast Guard Inspector, set seal compression in accordance with Chapter 4 in CG Tech Pub 3524-243-A.

Checking Seal Alignment – The Contractor shall check seal alignment in accordance with Chapters 4.1 (k) and 7.2 (c) in CG Tech Pub 3524-243-A. Reassemble the seal upon completion of work.

Attach a dial indicator to indicate the relative misalignment between the seat and the stationary face insert as the shaft rotates. The face of the seat, the aft side of the face carrier, or the flat side of the forward main clamp ring near the butt joint may be used as the indicator reference surface.

Engage the turning gear to rotate the shaft.

Adjust the alignment bolts and drive bolts to have a total indicator reading of 0.002” or less while the shaft is rotating. Take readings for three complete revolutions of the shaft.

Once the alignment is complete, lock the alignment bolts with their locking nuts. Recheck the alignment after locking. Disengage the turning gear and install the splash guard when work is complete The Contractor shall upon completion of all work, perform the Inflatable Seal testing and Operational Seal testing required in paragraphs 3.10 and 3.12 below.

Ensure that the seal and seawater cooling system are aligned and strain free.

Inflatable Seal Testing. Submit CFRs with results of below tests.

Stern Tube Seal Leakage Test – The Contractor shall pressurize the stern tube seal with clean fresh water through the flanged connections at the bottom of the mounting ring to 20 psig. Inspect and correct for any leakage.

Pressure Drop Test – The Contractor shall perform the inflatable seal pressure drop test on the inflatable seal in accordance with Chapters 4.2 and 6 in CG Tech Pub 3524-243-A Pressurize the inflatable seal to 60 psig using compressed air. Visually inspect to ensure that all piping joints are tight.

Inflate the seal to 75-90 psig, shut off all air valves, and monitor the air leakage. The air pressure shall not drop more than 5 psig in 15 minutes. Correct any deficiencies noted.

The sealing pressure for this cutter class is less than 40 psig.

Water Leakage Test – The Contractor shall, when the cutter is waterborne, perform the inflatable seal water leakage test on the inflatable seal in accordance with Chapters 4.2 and 6 in CG Tech Pub 3524-243-A.

with the shaft stopped and locked into position, inflate the seal to its normal air pressure. Slowly open the seal drain valve and drain the seal cavity.

Measure the seal leakage. If the leakage exceeds one pint per minute, take the necessary corrective actions.

Upon completion, align the seawater cooling lines and return the shaft to normal operation

The Contractor shall inspect and test all components in the presence of the Coast Guard Inspector. Turn over or dispose of unused parts and replaced parts as directed by the CG Inspector.

In the presence of the Coast Guard Inspector, The Contractor shall restore all affected equipment and systems to their normal operating condition after satisfactory completion of testing.

Contractor shall provide a copy of the EOP plackard per drawing WLB-225-567-001 and post per drawing WLB-225-567-001.

Operational test – post repairs. After completion of work, the Contractor shall witness an operational test (by Coast Guard personnel) of the shaft seals to prove that they are in satisfactory operating condition. Submit a CFR.

Observe the seal under operating condition. Ensure that there is no excessive heat, excessive leakage (more than 4 quarts per hour), or excessive vibration (more than 0.005” TIR). Also, ensure that there is no visible run-out of the bellows. Check the alignment of the seal seawater cooling piping to ensure there is no undue strain.

In the event of any of the above conditions, use the Technical Representative and CG Tech Pub 3524-243-A for troubleshooting. The seal shall perform normally in accordance with the CG Tech Pub after overhaul and renewal