B09_Attachment_9_Q_A_Amendment_002_0002.docx

140G0126Q0006 Amendment 002 Q&A

1. Can existing shop and construction drawings with equipment schedules for the existing mechanical room be provided to the bidders and/or can be reviewed at the additional site visit for 12/18/2025 @ 9:00 AM local time?

1. Not available

2. In the Statement of Work, is the 1,000,000 Btu/Hr boiler rating to be a minimum Input/Firing Rate or a minimum Gross Output Rating?

1. Max output rating

3. Section I.d – Statement of Work indicates “remove and replace the existing… hot water boilers, recirculating pump, and storage tank”. Regarding the storage tank, referred to in Amendment 001 Q&A as “It is used to heat research water”, please advise or any construction requirements including but not limited to:

a. Tank Material – no material preference

i. Carbon Steel

ii. 316L Stainless Steel

iii. Passivated Duplex Stainless Steel

iv. Other

b. PSI Working Pressure – 150 psi

i. 125 -PSI

ii. 150 PSI

iii. Other

c. Tank Lining - bare

i. Bare

ii. Glass Lined

d. ASME Code Requirements – none

i. None

ii. Section VIII Div 1

iii. Section IV HLW

iv. Other

e. Accessories

i. Tank Insulation (Advise minimum R-Value) – use industry standard

ii. Relief Valve (Advise PSI Rating) – use industry standard

1. Pressure Only

2. Temperature and Pressure

iii. Handhole - n/a

iv. Manway – n/a

v. Other – n/a

4. Section II.a.ii.2 – Statement of Work indicates “minimum of 97% Annual Fuel Utilization Efficiency (AFUE).” AFUE ratings only apply to residential hot water boilers less than 300,000 BTU/HR and AFUE is not applicable for 1,000,000 Btu/Hr boilers. It is my understanding the current Energy Conservation Standards (Effective January 10, 2023) for Small Gas-Fired Hot Water Commercial Packaged Boilers ≥300,000 Btu/Hr and ≤2,500,000 Btu/hr input is 84% ET (Thermal Efficiency). Per the AHRI Directory of Certified Product Performance website, Thermal Efficiencies of modulating condensing hot boilers range from 91% to 98%, with approximately 50% being above 96%. Please advise minimum Thermal Efficiency requirements for this project?

1. SOW to be revised to state 97% ET (Thermal Efficiency)

5. Section II.a.ii.3 – Statement of Work indicates “Boilers shall have BACnet capabilities”. Please advise if BACnet IP or BACnet MS/TP.

1. Bacnet IP or MS/TP

6. Section II.a.iii.2 – Statement of Work indicates “The contractor shall be responsible for a 12-month warranty on all equipment beginning on the start-up date”. Most modulating condensing boiler manufactures have stringent water quality WARRANTY requirements. The existing hot water heating system has insufficient air removal, dirt removal, and thermal expansion system components to help comply with the boiler manufacturer’s warranty requirements. Are the following recommended properly sized components required to also be installed?

1. Coalescing Air and Magnetic Dirt Separator - yes

2. Hydraulic, Coalescing Air, and Magnetic Dirt Separator - yes

3. Make-Up water Valve with RPZ Backflow Preventer - yes

4. Bag or Bladder Type Expansion Tank - yes

5. Chemical Bypass Feeder - yes