140P2022R0019-0005_Att01-QuestionsAndResponses-Corrected_01-13_220314_0005.pdf
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- Solicitation number
- 140P2022R0019
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This document contains questions and responses related to solicitation number 140P2022R0019 for a chiller plant replacement project at Independence National Historical Park in Philadelphia, Pennsylvania. The National Park Service is seeking to replace aging chillers, cooling towers, and related components across three locations. Key project details include replacing two 750-ton chillers and one 350-ton chiller, with York and Trane being the only acceptable manufacturers. Bidders must also meet dimensional and electrical requirements. The contractor will be responsible for initial refrigerants, chemicals, and glycol. Temporary chillers and pumps are required as well. The solicitation includes Buy American Act clauses. Site visits are available to capture additional photos and dimensions.
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140P2022R0019 Questions and Answers – Amendment #0005 03/14/2022
The following is a final consolidated list of current vendor questions. Responses in red shall address questions not previously responded or to provide updates to questions in which responses had been previously provided. Please note that some of the attached questions are still pending responses, which will be provided in a future amendment.
Verbal questions provided during the preproposal meeting held on March 1, 2022:
1. What kind of controls are currently in use?
Response: The existing controls are a Johnson Controls FX systems, see M700 Sheets and specification section 230913 for additional information.
2. Will the contractor be allowed to use the existing elevator?
Response: Spec section 01 11 00 states: “Existing Elevator Usage: Use of existing freight elevator to transport tools and equipment to/from roof shall be coordinated in advance with NPS personnel.
Contractor is responsible for installing/removing protective blanket/plywood to prevent damage to elevator. Contractor shall not load elevator beyond its safe working load. Elevator shall not be used to transport contractor personnel.” Additionally, stairs are available for use to the rooftop.
3. Is sound attenuation required on the new Cooling Towers?
Response: No sound attenuation is required. The sound performance of the specified towers is acceptable.
All questions provided below were submitted by vendors following the preproposal meeting:
4. Does any of the piping get blasted/primed / painted? If so, please send the painting/prime specifications.
Response: Specification Section 230500 indicates that painting of HVAC components is specified in Division 9 but no Division 9 was provided. Painting is only required for chilled water piping per the following: External surfaces of chilled water piping shall be cleaned and painted. Brush or roll three coats RustOleum “RustOCrylic”5700, Red primer (5769), grey coat (5781), finish (5779) to 4-6 mil final film thickness. Sherwin Williams equivalent allowed.
5. How can we find out what the power is downstairs? I forgot to take a picture of the available amperage. Please let me know.
Response: Refer to the three one line diagrams (ED700, EI700, and E700) for information on available power. If these drawings do not answer the question, please provide more specific information on what is needed.
6. I noticed Carrier is not listed in the chiller specifications as an acceptable manufacturer.
Response: Chillers for this project must meet the following requirements in order to function within the existing chilled water system, existing space available in the plant, existing ventilation systems, and existing electrical service to the building:
Performance – Per the temperatures and flows listed on the schedule
Dimensions – Water box length no longer than 15’ for any of the three chillers, water box width no wider than 7’ for the 750 ton chillers, 5’6” for the 350 ton chiller.
Refrigerant charge in the largest circuit - Requiring less than 4,000 CFM of machine room ventilation without modification to the existing exhaust fan, up to 4,400 CFM with fan modifications
Electrical requirements – Power requirements for the 750 ton chillers must be less than the following: KW = 510, MCA = 830, Fuse size 1200 amps or smaller coordinated with electrical properties of the chiller per NEC. Power requirements for the 350 ton chiller must be less than the following: KW = 250, MCA = 385, Fuse size 600 amps coordinated with electrical properties of the chiller per NEC.
Chiller manufacturers found to meet these requirements are listed in specification section 23 64 13, paragraph 2.2. Due to time constraints, no other manufacturers will be reviewed or pre-approved during the solicitation phase. Any chiller proposed as an equal must meet all of the requirements shown on the drawings as well as the critical dimensions listed here.
A revised Specification 23 64 13 – Water-Cooled Chillers will be forthcoming to reflect, “Available manufacturers are Trane and York: A Johnson Controls Inc. Company or an approved equal.”
7. I noticed the machines are selected with R-514A refrigerant, but the specifications mention R-134A or R-514A as being acceptable refrigerants. Does NPS have a preference to what refrigerant is included based on the phase out protocol that plans to happen in the upcoming years with R-134A?
Response: The allowable refrigerants listed in the specifications are aligned with the refrigerants used by the products offered by the available chiller manufacturers at the time the specification was written.
8. Is the contractor responsible for the first fills (i.e., glycol , chemicals , oils , water treatments , grease etc.)?
Response: Yes
Follow up to Question 8: Please include the type of Glycol and the percent of glycol needed if the contractor is responsible for it.
Response: Pending
9. Is the temporary power that’s available sufficient to feed the temporary Chiller?
Response: Refer to EI700 one line showing location for power to temporary chiller, and notes regarding power for the temporary chiller.
10. What are the contractor pump requirements needed to run the temporary chillers?
Response: Refer to temporary air cooled chiller schedule on sheet M600, the second line on the schedule indicates pumping requirements for the temporary chiller.
11. Please clarify if this project has a “Buy American “ act or a Material origin restriction.
Response: The solicitation has the two Buy American Act clauses in place (52.225-9 beginning on page 26 and 52.225-10 beginning on page 46).
12. Would we be able to coordinate with the gentleman that lead the site visit? We need to capture a few more photos. Please let us know when we can see the area again. We will make any time work (we just need about 20 minutes).
Response: To schedule a second walk through, contact Contract Specialist Alan Stormont, email alan_stormont@nps.gov rather than contacting the Park staff and he will coordinate with the Park.
Any additional walkthroughs will be limited to 30 minutes and allow for pictures or dimensions, but no questions or answers. Visits will be made available for Tuesday and Wednesday, March 15 and 16, 2022, and Tuesday, March 22, 2022.
13. Add 03 included the Contract Price Schedule, which clarified that CLIN’s 1, 2, and 3 are the Total Base Price. CWP-3 (Condenser Water Pump 3) is listed in both CLIN 3 and CLIN 4. Please clarify the scope you want included in CLIN 3 and CLIN 4 so there is no duplication between the different CLIN’s.
Response: Pending. A revised Contract Price Schedule will be provided in a future amendment.
(End of Amendment 0005 Q&As) mailto:alan_stormont@nps.gov
140P2022R0019
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