Attachment 1 - Performance Work Statement.pdf
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- Solicitation number
- N0040626Q0142
About this file
This is a Performance Work Statement (PWS) for the overhaul and electrical upgrade of two Dresser-Rand Model N20NL-11C High Pressure Air Compressors (HPACs) currently installed on the USNS Yukon (T-AO 202). The contract number is TBD, item number is designated as Category "A," with completion date of 2026-03-05.
The contractor must perform an 18,000-hour maintenance overhaul on both HPACs (serial numbers XM51224 and XM51318) and execute a system upgrade to replace obsolete electrical and condensate drain equipment. The compressors will be shipped from Alabama Shipyard to an OEM-approved facility in Chesapeake, Virginia. Work scope includes: disassembly and inspection of crossheads, connecting rods, crankshaft, and main bearings with replacement of worn components; thorough cleaning of the frame and oil sump; overhaul of the freshwater pump and oil pump; inspection and cleaning of the cooling water system with hydrostatic testing; refurbishment of condensate drain manifolds, check valves, and unloading valves; and completion of all electrical and condensate drain system upgrades. All work must be performed by qualified OEM technicians in compliance with manufacturer standards. The contractor must submit "as found" condition reports for components exceeding allowable tolerances, an "as released" final condition report, and technical manuals/drawings documenting the electrical and condensate drain upgrades. Upon completion, the contractor shall arrange transportation of both overhauled compressors to LP-26 MSC Norfolk Warehouse. The possible source identified is Curtiss-Wright Fleet Solutions in Chesapeake, Virginia.
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| File | Type | Posted |
|---|---|---|
| Attachment 2 - Government Furnished Property.pdf | ||
| Sole Source Justification_Redacted.pdf | ||
| Solicitation - N0040626Q0142.pdf |
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USNS Yukon
(T-AO 202)
UNREP CONTRACT NO. TBD
ITEM NO. PWS CATEGORY "A" 2026-03-05
HPAC OVERHAUL & ELECTRICAL
1.0 ABSTRACT
The purpose of this item is to perform the 18,000 hour maintenance on the ship’s high pressure air compressors (HPACs) AND perform the electrical and condensate drain upgrade (due to obsolete equipment installed).
2.0 REFERENCES
2.1 NAVSEA Tech Manual T6220-AS-MMO-010, High Pressure
Air Compressor Model: N20NL-11C
2.2 NAVSEA Tech Manual S6220-DR-OMI-B10 AIR COMPRESSORS
HIGH PRESSURE OIL-FREE MODELS N20NL-11G AND N20NL-
11H WITH PROGRAMMABLE LOGIC CONTROLLER
3.0 ITEM LOCATION/DESCRIPTION
3.1 Location/Quantity
3.1.1 Locations
a. MSC to ship to Contractor’s Facility
3.1.2 Quantity: Two (2)
3.2 Item Description/Manufacturer’s Data
3.2.1 Manufacturer: Dresser-Rand
Company Model Number: N20NL- 11C
3.2.2 Serial number for compressor 1
is XM51224.
3.2.3 Serial number for compressor 2
is XM51318.
4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICE:
4.1 Two (2) EA Dresser-Rand Company Model Number:
N20NL-11C High Pressure Air Compressors.
5.0 NOTES:
UNREP CONTRACT NO. TBD
5.1 Do not allow grease or oil to contaminate parts
that contact the air stream. Ensure all lockout/tagout procedures are in accordance with current shipboard instructions.
5.2 Refer to the manufacturer’s technical manual for
detailed step-by-step procedures for the following maintenance actions.
6.0 QUALITY ASSURANCE REQUIREMENTS: None additional
7.0 STATEMENT OF WORK REQUIRED
7.1 Two (2) used HPAC Compressors as identified within
Para 3.0, currently located in Alabama Shipyard will be delivered to the OEM approved facility in Chesapeake, VA for shop overhaul.
7.2 Drain and dispose of any liquid in accordance with
all federal, state, and local regulations.
7.3 Temporarily remove crossheads and connecting rods
from the compressor.
7.3.1 Remove and replace connecting rod crankpin
bearing shells. When installing new shells, ensure that the oil passages are currently aligned.
7.3.2 Clean all crosshead and connecting rod parts
with an approved solvent, paying particular attention to all oil passages.
7.3.3 Inspect and measure all critical dimensions
of the crosshead, crosshead pin, and retaining ring. Take a gauge reading of the connecting rod crankpin bearing. Replace any components exceeding allowable tolerances or are otherwise damaged.
7.4 Remove the crankshaft and main bearings.
7.4.1 Clean the crankshaft, paying particular
attention to the journals surfaces and or passages.
UNREP CONTRACT NO. TBD
7.4.2 Inspect the crankshaft for nicks, scratches, other surface defects or cracks. Perform a magnetic particle test.
7.4.3 Measure the critical dimensions of the
crankshaft. Submit an “as found” condition report including recommendation to replace the crankshaft if allowable tolerances are exceeded.
7.4.4 Check the main bearing saddles for
irregularities or debris.
7.4.5 Replace all main bearings and take gauge
readings to ensure correct clearances.
7.4.6 Reinstall crankshaft.
7.5 Thoroughly clean the frame and oil sump.
7.5.1 Drain lube oil sump.
7.5.2 Remove all dirt or sludge deposits.
7.5.3 Replace O-ring in sump drain plug.
7.5.4 Clean all oil pipes, including those
previously removed from compressor and the lube oil strainer.
7.5.5 Inspect all portions of the frame and sump
for damage or other defects.
7.6 Disassemble and inspect the oil pump. Pay
particular attention to the rotor assembly. Submit an “as found” condition report. Reassemble the oil pump.
7.7 Replace the crankshaft oil seal.
7.8 Clean and inspect the piston rod oil wiper
assemblies.
Note: Before disassembling a wiper ring matchmark the ring segments to permit correct reassembly.
UNREP CONTRACT NO. TBD
7.8.1 Examine the wiper rings for cracks or
breakage. If one segment needs replacement, change the entire set.
7.8.2 Clean the stuffing boxes before reinstalling
rings. Reinstall rings.
7.9 Temporarily remove and overhaul the freshwater
pump.
7.9.1 Disassemble freshwater pump and submit an
“as found” condition report.
7.9.2 Reassemble and reinstall freshwater pump.
7.10 Clean the cooling water system.
7.10.1 Open and inspect the air coolers and cooling
water heat exchanger. Submit an “as found” condition report.
7.10.2 Clean the cooling water system of dirt and
debris. MSCREP to inspect.
7.10.3 Close the cooler with new gaskets.
7.11 Hydrostatically test the cooling water system.
7.12 Refurbish the manual condensate drain manifold.
7.13 Refurbish the drain line check valves.
7.14 Refurbish the unloading valve and unloading valve
pilot valve.
7.15 Perform system upgrade to the drains (as are
obsolete and not supported) “Electrical and Condensate Drain system related” to allow for compressors to have supportability for future repairs/service requirements.
7.16 Prepare equipment for testing and accomplish
operational test in OEM Workshop in the presence of
MSCREP.
7.17 After completion of all portions of this contract, UNREP CONTRACT NO. TBD coordinate arrange for transportation of Government Materials, two (2) Overhauled Condition Code “A” HPAC Compressors as identified within Para 3.0, from Contractors OEM Workshop to LP-26 MSC Norfolk Warehouse.
7.18 Reports
7.18.1 When inspection, service and/or testing
reveal any deficiency, a condition report is to be submitted to the MSCREP with recommended repairs and parts required.
Submit one (1) electronic copy in Portable Document Format (PDF).
7.18.2 Submit a report that includes “as released”
condition of the HPACs. Submit one (1) electronic copy in Portable Document Format
(PDF).
7.18.3 All reports and checklists are to be
completed and signed by the person who carried out the inspection and maintenance work and countersigned by the Company’s representative.
7.19 Manufacturer’s Representative
7.19.1 Accomplish all work and shop testing by
qualified OEM technicians on the HPACs identified in paragraph 3.0 ensuring compliance with the manufacturer’s standards and performance specifications.
7.19.2 Possible Source
CURTISS-WRIGHT FLEET SOLUTIONS; 1101
CAVALIER BLVD, CHESAPEAKE, VA 23323;
+1.757.494.2925 / M +1.757.268.4719 / F+1.757.487.9450 ;
MMCNULTY@CURTISSWRIGHT.COM; POC MIKE
MCNULTY
7.20 Preparation of Drawings: Provide Tech
Manual/Drawings (all relevant data) for the Electrical and Condensate Drain system related mailto:MMCNULTY@CURTISSWRIGHT.COM
UNREP CONTRACT NO. TBD
upgrades performed.
8.0 GENERAL REQUIREMENTS: None additional
| 2.1 NAVSEA Tech Manual T6220-AS-MMO-010, High Pressure Air Compressor Model: N20NL-11C |
| 2.2 NAVSEA Tech Manual S6220-DR-OMI-B10 AIR COMPRESSORS HIGH PRESSURE OIL-FREE MODELS N20NL-11G AND N20NL-11H WITH PROGRAMMABLE LOGIC CONTROLLER |
| 4.1 Two (2) EA Dresser-Rand Company Model Number: N20NL-11C High Pressure Air Compressors. |
| 5.1 Do not allow grease or oil to contaminate parts that contact the air stream. Ensure all lockout/tagout procedures are in accordance with current shipboard instructions. |
| 5.2 Refer to the manufacturer’s technical manual for detailed step-by-step procedures for the following maintenance actions. |
| 7.1 Two (2) used HPAC Compressors as identified within Para 3.0, currently located in Alabama Shipyard will be delivered to the OEM approved facility in Chesapeake, VA for shop overhaul. |
| 7.2 Drain and dispose of any liquid in accordance with all federal, state, and local regulations. |
| 7.3.2 Clean all crosshead and connecting rod parts with an approved solvent, paying particular attention to all oil passages. |
| 7.3.3 Inspect and measure all critical dimensions of the crosshead, crosshead pin, and retaining ring. Take a gauge reading of the connecting rod crankpin bearing. Replace any components exceeding allowable tolerances or are otherwise damaged. |
| 7.4.1 Clean the crankshaft, paying particular attention to the journals surfaces and or passages. |
| 7.4.2 Inspect the crankshaft for nicks, scratches, other surface defects or cracks. Perform a magnetic particle test. |
| 7.4.3 Measure the critical dimensions of the crankshaft. Submit an “as found” condition report including recommendation to replace the crankshaft if allowable tolerances are exceeded. |
| 7.4.4 Check the main bearing saddles for irregularities or debris. |
| 7.4.5 Replace all main bearings and take gauge readings to ensure correct clearances. |
| 7.4.6 Reinstall crankshaft. |
| 7.5 Thoroughly clean the frame and oil sump. |
| 7.5.1 Drain lube oil sump. |
| 7.5.2 Remove all dirt or sludge deposits. |
| 7.5.3 Replace O-ring in sump drain plug. |
| 7.5.4 Clean all oil pipes, including those previously removed from compressor and the lube oil strainer. |
| 7.5.5 Inspect all portions of the frame and sump for damage or other defects. |
| 7.6 Disassemble and inspect the oil pump. Pay particular attention to the rotor assembly. Submit an “as found” condition report. Reassemble the oil pump. |
| 7.7 Replace the crankshaft oil seal. |
| 7.8 Clean and inspect the piston rod oil wiper assemblies. |
| 7.8.1 Examine the wiper rings for cracks or breakage. If one segment needs replacement, change the entire set. |
| 7.8.2 Clean the stuffing boxes before reinstalling rings. Reinstall rings. |
| 7.9 Temporarily remove and overhaul the freshwater pump. |
| 7.9.1 Disassemble freshwater pump and submit an “as found” condition report. |
| 7.9.2 Reassemble and reinstall freshwater pump. |
| 7.10 Clean the cooling water system. |
| 7.10.1 Open and inspect the air coolers and cooling water heat exchanger. Submit an “as found” condition report. |
| 7.10.2 Clean the cooling water system of dirt and debris. MSCREP to inspect. |
| 7.10.3 Close the cooler with new gaskets. |
| 7.11 Hydrostatically test the cooling water system. |
| 7.12 Refurbish the manual condensate drain manifold. |
| 7.13 Refurbish the drain line check valves. |
| 7.14 Refurbish the unloading valve and unloading valve pilot valve. |
| 7.15 Perform system upgrade to the drains (as are obsolete and not supported) “Electrical and Condensate Drain system related” to allow for compressors to have supportability for future repairs/service requirements. |
| 7.16 Prepare equipment for testing and accomplish operational test in OEM Workshop in the presence of MSCREP. |
| 7.17 After completion of all portions of this contract, coordinate arrange for transportation of Government Materials, two (2) Overhauled Condition Code “A” HPAC Compressors as identified within Para 3.0, from Contractors OEM Workshop to LP-26 MSC Nor... |
| 7.18.1 When inspection, service and/or testing reveal any deficiency, a condition report is to be submitted to the MSCREP with recommended repairs and parts required. Submit one (1) electronic copy in Portable Document Format (PDF). |
| 7.18.2 Submit a report that includes “as released” condition of the HPACs. Submit one (1) electronic copy in Portable Document Format (PDF). |
| 7.18.3 All reports and checklists are to be completed and signed by the person who carried out the inspection and maintenance work and countersigned by the Company’s representative. |
| 7.19.1 Accomplish all work and shop testing by qualified OEM technicians on the HPACs identified in paragraph 3.0 ensuring compliance with the manufacturer’s standards and performance specifications. |
| 7.19.2 Possible Source |
7.20 Preparation of Drawings: Provide Tech Manual/Drawings (all relevant data) for the Electrical and Condensate Drain system related upgrades performed.
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