12351_-_Z-drive_Flush,_Seal_replacement_REV1.doc

NOAA SHIP NANCY FOSTER

(R-352)

1MAY2018

ITEM NO. 12351

BASIC ITEM

MED/KRZ

Z DRIVE Repairs

REV1

E

1.0 ABSTRACT

1.1 This item describes the requirement to inspect the port and starboard z drives, drain and flush the drive gear boxes, remove and renew all Drive shaft seals, o-rings or gaskets, and refill the 2 separate lubricating and sealing oil sections of the drives.

2.0 REFERENCES:

2.1 NF 241-05, Technical Manual for Z Drive, Model 260/370-H

3.0 ITEM LOCATION/DESCRIPTION:

3.1 Location: Stern, FR. 88 port and starboard.

3.2 Quantity: Two (2)

3.3 Description:

Manf: Ulstein Maritime Ltd. (Rolls Royce)

Model: 260/370-H

HP: 300

Port Z drive Serial # 1697 002

Stbd Z Drive Serial # 1697 001

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICE:

4.1 None – Contractor to furnish all materials, oils, etc to accomplish repair.

5.0 NOTES

5.1 The contractor and all subcontractors regardless of tier are advised to review other work items under this contract, including but not limited to 10011 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 references included in work item 10011.

6.0 QUALITY ASSURANCE: NONE ADDITIONAL.

7.0 STATEMENT OF WORK REQUIRED

7.1 Provide the services of Pacific Star Marine (POC is Pete Farnworth, 604-220-9824), or similar, to provide technical services for this repair. The technical representative is to have a minimum of 15 years’ experience with accomplishing major overhauls of marine Z Drives. This technical representative should also be present during sea trial.

7.2 Follow Lockout / Tagout requirements in accordance with NANCY FOSTER’s Chief Engineer policies and procedures.

7.3 Immediately after dry docking AND after completion of repair but prior to undocking, accomplish 2-3 PSI pressure test on each gear case supervised by tech rep. Submit condition report in each instance. Air test can be accomplished by utilizing the threaded oil fill connection on the upper gear box.

7.3.1 Additionally, verify alignment of electric motor to z-drive input shaft for both units. Submit condition report (include instrument calibration info/certs).

7.4 Accomplish the following for each Z Drive to inspect the upper gear box.

7.4.1 Drain the oil from each z drive by draining oil from lower gear box.

7.4.2 Flush gear box oil containment areas with suitable petroleum product (as approved by the tech rep) to remove seawater from the drive systems.

7.4.3 Hand turn the gear box from the input drive shaft to ensure that flushing agent engages all internal components and then drain agent.

7.4.4 Ensure that shutoff valve for the seal head tanks is secured to prevent loss of clean seal lubricant.

7.4.5 Properly dispose of contaminated gear oil and flushing fluids in accordance local, state, and federal regulations.

7.5 Under the supervision of the tech rep., renew the propeller shaft seals for the port and starboard z drives.

7.5.1 Remove propeller cap and propeller from each unit. Conduct a visual inspection of the propellers and submit a condition report. Note that there are existing padeyes on the hull that may be utilized for rigging the propellers. Contractor should inspect/weight test the padeyes in accordance with their internal policies.

7.5.2 Inspect the seal liners and submit an as found condition report. Pay close attention to identify failed components, condition of liners, as-found orientation of shaft seals, etc. If failed component is found, leave in place, photograph and call-out COR, CME & ABS surveyor to observe.

7.5.3 Replace shaft seals & shaft seal liners using REF 2.1 as a guide. Note correct orientation of shaft seals in REF 2.1.

7.6 PRICE THIS PARAGRAPH AS AN OPTIONAL ITEM (INCLUDE EXTRA 3 DAYS IN DRY DOCK)

Accomplish the following for each of the lower steering leg assemblies.

7.6.1 Remove the Z Drive lower gear boxes/steering leg assemblies from ship to shop.

7.6.2 Disassemble (with exception of pressing bearings off shafts) each unit paying close attention to identify failed components, condition of liners, as-found orientation of shaft seals, etc. If failed component is found, photograph and call-out COR, CME & ABS surveyor to observe. Measure and inspect seal liners and gears in the presence of the port engineer and ABS surveyor.

7.6.3 Submit an as found condition report with recommendations, as-found conditions noted above and which identifies failure mode which caused seawater intrusion into units (including labeled photographs as necessary to illustrate failure).

7.6.4 Reassemble the lower gear box/steering leg assemblies. Contractor is to provide all materials, seals, gaskets, etc.

7.6.5 Measure backlash readings on gears. Blue gears and check contact pattern in presence of ABS Surveyor and Port Engineer.

7.6.6 Install units on ship.

7.6.7 Install SSTL locking wire as required by service technician.

7.7 Install the propellers & propeller caps using Ref. 2.1 for guidance.

7.8 Fill both Z Drive gear box assemblies with new Shell Omala S2G 68 Gear Oil. Each gear box assembly takes about 32 gallons. Open the seal head tank valves to allow oil to the seal areas. Manually rotate both Z Drives for approximately ½ hour.

7.9 Top up both Z Drive seal oil head tanks with new Bio-EP Gear Oil ISO 68 biodegradable oil. Each head tank takes about 15 gallons. This oil is different from the drive gear oil. Do not mix.

7.10 Prior to undocking, accomplish a 1 ½ psig air test on the port and starboard nozzles to test for leaks. Submit report with findings.

7.11 Clean all oil residue from bilges in way of both z-drives.

7.12 Renew round zincs that are bolted to the top side of the kort nozzle support braces on port and starboard z drives (8 total zincs).

8.0 GENERAL REQUIREMENTS: None Additional.

END OF ITEM

12351-1