Attachment_06_N1_Brake_Ring_Questions_and_Answers_01.pdf

N1 Brake Ring Solicitation

Questions and Responses 01

Question 01: Construction or supply contract

Answer 01: Construction

Question 02: Bonding required

Answer 02: Yes

Question 03: Contractors license requirement

Answer 03: No

Question 04: Insurance requirement

Answer 04: Yes

Question 05: Is the Rotor currently removed

Answer 05: Rotor is currently in place but will be removed prior to contractors being onsite.

Question 06: Are there any current photos of the pads

Answer 06: Yes, see attachment.

Question 07: Material

Answer 07: Use ASTM A588 Grade B.

Question 08: Finish tolerance for pad thickness

Answer 08: The contract requirement is for brake “plates” not brake “pads”. The brake plate thickness should have a tolerance of ±0.002 inches.

Question 09: Field machining to pad mounting surface, or pad

Answer 09: Unclear what this question is asking about regarding field machining pads vs mounting surface, please elaborate.

Question 10: Field machining tolerance

Answer 10: Tolerance as follows (unless otherwise specified);

• Fractional measurements: ±1/32 inches.

• Angular measurements: ±0.25 degrees, ±0.5 inch bend.

• Two place decimals: ±0.02 inches.

• Three place decimals: ±0.005 inches.

Question 11: Staff requirement for field work, safety, sup, PM

Answer 11: There must be a qualified Superintendent, Site Safety and Health Officer, and Project Manager. One individual can fulfill multiple roles so long as they have the qualifications for it.

Question 12: There may be more to investigate than just the brake ring replacement, When does the USBR plan to have the rotor out for initial inspection?

Brake System Condition / Pad Material / Brake Alignment

Answer 12: The unit’s initial inspection is planned for October 1, 2027.

Question 13: Timelines.

Answer 13: The SOW has an updated timeline, the general timeline for onsite work is now November 2027 to February 2028.

Question 14: NTP Date

Answer 14: SOW has updated dates, plates are needed by 1 October 2027.

Question 15: USBR Pull Unit for swap out of brakes (after inspection and finish machining) – Fall 2026? Do you have a target date as of now?

Answer 15: Fall of 2027, the rotor is planned to be pulled beginning October 1 2027.

Removal of the rotor will take 6 weeks.

Question 16: How many weeks does USBR plan to have unit Out of Service? 4 Weeks planned down time?

Answer 16: The USBR will have the unit out of service and available for onsite work (the rotor removed and for a maximum of 12 weeks.

Question 17: How far off the floor is this ring sitting once the rotor is on the floor? How much room will crew have?

Answer 17: Once the rotor is on the floor there will be roughly 26 inches of clearance.

Question 18: Do they have a recent set of wipe samples taken on this unit to establish no lead or asbestos? If not, will they verify all of this before Contractor shows up?

Answer 18: The interior of the rotor housing contains lead paint, there is no asbestos.

Question 19: What are the safety requirements going to be for the on site crew?

Answer 19: Health and safety protocol can be found in the Reclamation Safety and Health Standards (RSHS) at the following link: http://www.usbr.gov/ssle/safety/RSHS/rshs.html

A new section with safety was added to the SOW, which references the RSHS.

Question 20: What level of pre- demo readings are expected? (FARO or manual?)

Answer 20: Minimum requirements are manual measurements with a precision of three decimal places, FARO/scanner measurements will be allowed.

Question 21: What level of installed measurements are expected? (FARO or manual?)

Answer 21: The same method and precision as used by contractors for pre-demo measurements.

Question 22: What are the requirements for our Supervisor / Supervisors? How many do we need?

Answer 22: One superintendent must be onsite during performance.

Question 23: Do you want any testing or checks done to Brake Assemblies? Do they need to be rebuilt?

Answer 23: No, the contract does not require any work on the brake assemblies.

Question 24: What about Brake Pads?

Answer 24: The Brake Pads are not part of this contract.

Question 25: Material

Answer 25: Use ASTM A588 Grade B.

http://www.usbr.gov/ssle/safety/RSHS/rshs.html