Questions answered_31Oct2025.pdf

31 October 2025

Questions and Answers

W9127N26QA001

1. Q: Please provide an explanation on how all of the materials listed in section 2.2.2, except for TX-MM don’t meet the requirements stated in section 2.2.1a. or 2.2.1b. Most of the materials listed in section 2.2.2 were not tested in CERL TR 99/104 including Lubron HX which is being sole sourced for this project.

A: The Lubron HX material has been tested in accordance with CERL TR 99/104 with test results meeting the requirements outlined in the specifications. For this application, a self-lubricated bronze-backed liner type bearing system is required due to other design constraints. The Lubron HX product is the only product on the approved FCB list that is of this type.

2. Q: Overall gate load and expected load distribution across the six wheels (and any abnormal loading cases).

A: This information varies for diƯerent gate operation scenarios, but is not required for fabricating the wheel assemblies as detailed in the plans and specifications. The below design criteria result from the maximums of the consideration of the overall gate loadings and wheel load distributions.

3. Q: Design load per wheel (static and dynamic), including any required safety factors.

A: Maximum static load per wheel: 162.0 kip. Maximum dynamic load per wheel:

58.3 kip.

4. Q: Any limits on allowable contact stress, maximum lateral (side) loads, and shock/impact factors during operation.

A: There are no significant shock or impact factors during operation. Static lateral loads are assumed to be no greater than 32.4 kip, dynamic lateral loads no greater than 12 kip. Maximum contact stress will be limited to 201.6 ksi.

5. Q: Operating conditions relevant to design: typical duty cycle, lift/translation speed, ambient temperature range, lubrication expectations, and environmental exposure (water spray, grit, etc.).

A: The gate is exercised an average of 7 times per day, where each cycle consists of the gate traveling approximately 220 feet at 0.5 feet/sec. Each cycle takes the wheels from fully submerged (up to a depth of 120 feet) to fully out of the water. The bushings will be self-lubricated as required in the specifications. The ambient temperature range when out of the water may range from 0 – 120 deg F.

6. Q: Any additional design criteria not shown in the released package that USACE requires the supplier to meet.

A: There are no additional design criteria pertinent to the wheel fabrication and assembly.

**Note regarding questions/answers 2-6: Providing wheel assemblies fabricated as specified and to the dimensions and tolerances as shown in the plans will result in meeting all of the design criteria provided above. As such, this information should not be required to perform the required fabrication and assembly. However, the requested design criteria that was used as the basis for this design is provided above.