A.02 LGA Unit 3 Hub Shaft Sources Sought.pdf

Sources Sought for Little Goose Unit 3 Hub Shaft Repair

Sources Sought W912EF25RSS29

The US Army Corps of Engineers, Walla Walla District is seeking small business sources for a construction project entitled: Little Goose Unit 3 Hub Shaft Repair. The North American Industry Classification System (NAICS) code for the project is 237990 Other Heavy and Civil Engineering Construction. The magnitude of construction is estimated between $1,000,000 and $5,000,000.

This sources-sought announcement is a tool to identify businesses with the capability to accomplish the work. This is not a solicitation. Only those firms that respond to this announcement by submitting the following information will be used in determining whether to set aside this requirement.

1. A list of current and past projects demonstrating technical experience with work of a similar nature to that listed in the Summary Scope of Work. For each project submitted, provide a brief narrative statement if the work involved your firm’s role in the project, performance period, the dollar value and the completion date. Include a statement detailing any special qualifications and certifications, applicable to the scope of this project, held by your firm and/or in-house personnel.

2. A reference list for each of the projects submitted in 1) above. Include the name, title, phone number and email address for each reference.

3. Provide a statement of your firm’s business size (HUBZone, Service-Disabled Veteran Owned, 8(a), small disadvantaged, or womaned-owned) with regards to the NAICS code listed above.

4. Provide a statement that your firm intends to submit an offer on the project when it is advertised.

5. Provide a statement of your firm’s bonding capacity. A statement from your surety is not required at this time.

6. Cage Code and UEI number.

Submit this information to Richard Bonnell, Contract Specialist, via email to richard.w.bonnell@usace.army.mil. Your response to this notice must be received on or before 11:00 a.m. (PST) on June 5, 2025.

Summary of Scope of Work:

The project involves sealing a known oil leak on a Kaplan turbine shaft hub, allowing Unit 3 to resume normal Kaplan operations. Little Goose Main Unit 3’s Kaplan turbine runner was forced out of service when the turbine was found to be leaking oil. The main scope of work for this contract addresses the leak found at the turbine shaft to hub flange. The o-ring between the top of the Kaplan hub and the shaft lower flange has failed at this location. The work detailed will contain the runner leakage and route the leaked oil back to the static oil head. Instead of replacing the failed o-ring (requiring unit disassembly), this job seeks to contain leakage by sealing the outer diameter of the shaft flange where it meets the hub. It will also include welded caps for each coupling bolt, and piping at the shaft jacking bolts to contain leaking within the flange face and routing it back to the static oil head. The work will be completed with the unit partially disassembled (performed by government personnel) and confined to the turbine pit with limited egress.

1. Fabrication and Installation of Metal Seal Ring

Design, fabricate, and install a segmented steel seal ring (~106" diameter) at the turbine shaft flange/hub interface.

The ring must include redundant seals and a flanged joint for assembly/disassembly.

Contractor to submit detailed drawings for approval, including methods of joining and sealing.

Ring to be painted with Government-supplied primer and paint (per powerhouse standards).

2. Seal Welded Caps on Coupling Bolts

Fabricate and weld pipe caps over hub-to-shaft coupling bolts to prevent oil leakage.

Caps will be penetrant tested by a third-party Non-Destructive Examination (NDE) contractor, under Government Quality Assurance Representative (GQAR) oversight.

Caps will also be pressure tested and coated with immersion-grade epoxy paint.

3. Stainless Tubing Installation

Install 3/8" stainless steel tubing to redirect any leaked oil through existing unwatering piping via modified jacking bolt holes.

Tubing will include NPT taps, check valves, and routing to the static oil head.

4. Final Testing

After sealing components are installed, the system will be pressure tested.

Under Government oversight, apply 25 psi air to the Kaplan system and perform leak checks using soapy water.

Inspection will focus on the following: seal ring, coupling bolt caps, stainless piping, blade seals, and runner cone seam.

Tentative Schedule:

Anticipated Award: Aug 2025

Start of On-Site Work: Sept 2025

Estimated Completion: Dec 2025