SOW 1P45B79 Work item 1 Cooler Inspect Final.doc

26402_0121_210_270_295

REC_26402_210_270_295_«REC»

RFQ 2121 801P45B79 CGC HARRIET LANE

WORK ITEM 1: Lube Oil Heat Exchangers; Clean, Inspect And Hydro

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to clean, inspect, and repair the #1 MDE Lube Oil heat exchanger onboard HARRIET LANE, located in Portsmouth VA. This work is needed because the #1 MDE currently has lube oil leaking into the jacket water system. The ship suspects this is due to an issue with the lantern ring. The ultimate intent of this work item is to identify and correct the source of the lube oil leak. The lube oil cooler should be left in place if possible to minimize hot work and associated costs.

table 1 – heat exchangers

1.2 Government-furnished property.

($/UNIT)

2. REFERENCES

Coast Guard Drawings

Coast Guard Drawing 901 WMEC 201-001, Rev T, Engine Room Arr Coast Guard Publications

Coast Guard Technical Publication (TP) 4647, Apr 2019, FM/ALCO 251 Engine – Operations and Maintenance Manual Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2020, General Requirements

Surface Forces Logistics Center Standard Specification 5000 (SFLC Std Spec 5000), 2020, Auxiliary Machine Systems

Surface Forces Logistics Center Standard Specification 6310 (SFLC Std Spec 6310), 2020, Requirements for Preservation of Ship Structures

Other References

Commercial Item Description (CID) A-A-59588, 2013, Rubber Silicone

3. REQUIREMENTS

3.1 General.

3.1.1 CIR.

None.

3.1.2 Tech Rep.

Not applicable.

3.1.3 Protective measures. The Contractor must furnish and install all protective measures in accordance with SFLC Std Spec 0000, paragraph 3.3.3 (Vessel component, space, and equipment protection).3.1.3.1 Install blanks on the open ends of piping to prevent any contamination or foreign debris from entering the affected systems. Ensure that all cleaning equipment or media used in the cleaning process do not cause any damage to cooler components.

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:

· Piping and hoses

· Filters

· Deck plating and associated framing

· Electrical cables

· Thermal insulation.

3.2 Fluid disposition, disposal. Dispose of all removed fluids in accordance with all applicable Federal, state, and local regulations.

3.3 Disassemble. The Contractor must drain and disassemble the designated heat exchangers (see paragraph 1.1 (Intent)) to the extent necessary to perform all work specified herein. Remove end bell from heat exchanger and clean sealing surface areas. Perform all disassembly and reassembly in accordance with manufacturer-recommended procedures using manufacturer-recommended tooling to ensure parts are reinstalled in proper sequence and configuration.

3.4 Inspection. Before cleaning is begun, the Contractor must visually inspect all heat exchanger surfaces for excessive deterioration and any other defects. After removal of end bell from exchanger housing, inspect sealing surface areas to include tube bundle mating surface. Submit a CFR.

3.5 Cleaning requirements. The Contractor must clean exterior heat transfer surfaces to a state free of all debris to include end bell, scale and surface contaminants in accordance with the heat exchanger manufacturer’s recommendations, and in compliance with all Federal, state, and local environmental regulations. Once disassembly of end bell and exchanger body has occurred, clean and inspect for internal damages to include tube bundle ends. Ensure that chemical cleaners do not damage the environment, heat exchanger or the vessel.

NOTE

Historically, chemical cleaning has been necessary to thoroughly clean most heat exchanger tubes.

3.6 Reassembly. After authorized repairs, if any, the Contractor must reassemble each heat exchanger.

3.6.1 Renew all software (seals, gaskets, O-rings, lantern rings).

3.6.2 Renew isolation fittings/mounts and fasteners if disturbed. Apply silicone rubber sealant conforming to CID A-A-59588 around all fasteners, nozzles or gaskets that penetrate the hull.

3.6.3 Renew all hoses, thermostats and anodes if applicable.

3.6.4 Refill all heat exchanger fluid levels, including all lube oil and jacket water in all engines, in accordance with manufacturer and vessel specifications. Submit a CFR.

3.7 Reinstallation. After completion of testing and all authorized repairs, if any, the Contractor must reinstall each cooler (if previously removed). Where applicable, renew all zinc electrode plates, gaskets, and recessed hex-head bolts in accordance with the manufacturer's specifications. Apply a copper-based anti-seize compound on all bolts, and torque in accordance with manufacturer’s specifications.

3.8 Touch-up preservation. The Contractor must prepare and coat all new and disturbed surfaces to match existing adjacent surfaces in accordance with SFLC Std Spec 6310, (Touch-ups and minor coating repairs.)

3.9 Cleanliness requirement. The Contractor must visually inspect all cleaned surfaces to ensure completely free of debris and surface contaminants. Submit a CFR.

CAUtion

Extreme caution must be taken to not exceed manufacturer’s recommended test pressure during hydrostatic testing.

3.10 Pressure test. After all authorized work is complete and prior to reconnecting the heat exchanger(s), the Contractor must pressure test each heat exchanger to the manufacturer’s recommended test pressure in accordance with the applicable Coast Guard drawing listed under Section 2 (References). In the absence of a specified test pressure noted in the Coast Guard drawing, the Contractor must pressure test each heat exchanger in accordance with SFLC Std Spec 5000, Appendix C (Heat exchangers and fluid coolers). Ensure no leakage from or permanent deformation of pressure-containing parts by repairing all leaks and discrepancies. Submit a CFR.

3.11 Label plates. The Contractor must attach an anodized aluminum test data plate to each heat exchanger using epoxy resin cement. Ensure that each plate is engraved with ¼-inch high letters, stating the following:

· Test pressure.

· Test date.

· Testing facility.

NOTE

If the heat exchanger design makes mounting a test data plate impractical, the Government reserves the right to request written documentation of the above-listed testing data in lieu of a test data plate, at no additional cost to the Government.

3.12 Leak test. After reconnecting the heat exchanger(s) on the vessel (and post undocking, if applicable), the Contractor must perform an operational test of the heat exchanger and associated system piping for one hour using the system fluid at normal operating pressure. Ensure zero visible leakage from or deformation of mechanical parts by repairing all leaks and discrepancies. Submit a CFR.

4. NOTES

N/A