Q and A as of 2Aug22 W50S9C22B0004 Replace B-120 Chiller.pdf
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- Attached to
- VTANG Replace B-120 Chiller
- Solicitation number
- W50S9C-22-B-0004
About this file
This document contains questions and answers regarding solicitation number W50S9C-22-B-0004 from the Vermont Army National Guard to replace an existing 81-ton roof-mounted chiller on Building 120 with a ground-mounted chiller. The project scope includes removal of the existing chiller; installation of new mechanical, electrical, and plumbing systems for the replacement chiller; modifications to the flightline fence; and sequenced transfer of operations to the new chiller followed by demolition of the existing chiller. Special requirements are specified for attaching brackets to the simulator wall and capping pipes and conduits penetrating the roof of the secure facility. The questions and answers provide clarification on the type of insulation and jacket allowed for exterior piping, the weight of the existing chiller, the intent to remove a section of fence, existing glycol percentage in the system, lightning protection requirements, and securing of vertical pipes to the simulator wall.
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W50S9C-22-B-0004
REPLACE B-120 CHILLER
QUESTIONS and ANSWERS
As of 8/2/22
1. Question: In lieu of using the ASTM C547 and ASTM C795 rigid molded noncombustible, with wicking materiel as specified in the HVAC PIPING INSULATION SPEC NUMBER 23 07 19, page
2, paragraph 2.2 Note A. and Weatherproofed with smooth Aluminum and aluminum fitting covers.
Can we use 2" thick polyunsaturate (urethane) pipe insulation with a ASJ jacket vapor barrier, weather proofed with a PVC jacket and use PVC fitting covers?
Answer: The exterior above grade piping is called out in specification 23 21 13 – Hydronic
Piping section 2.3.A as factory insulated HDPE pipe and does not require additional insulation.
The proposed insulation is allowable with 2.3.B PP-RCT piping. The scheduled insulation in 23
07 19 – Piping Insulation section 2.2.A is for the interior chilled water piping required for the piping for the bypass valve.
2. Question: What is the weight of the existing chiller to be removed?
Answer: The existing chiller weighs approximately 12,000 lbs.
3. Question: Please confirm the location of the existing 2-way valve within the Special Access Program
Facility (SAPF) that requires replacement with a 3-way valve and describe access situation in the area of the valve?
Answer: That note has been removed as the existing 2-way valve at HVAC-1 shall remain and a bypass valve on a 2-1/2” bypass line with a circuit setter set for 105 GPM.
4. Question: Please confirm the intent is to remove the section of existing fence on C-1 where the new bump out around the Chiller is indicated?
Answer: Confirmed.
5. Question: What is the existing glycol %?
Answer: 30% Propylene Glycol/70% Water
6. Question: Is lightning protection required on the Chiller?
Answer: No.
7. Question: Where the new pipes run vertically down the SAPF simulator wall on the East side just
North of the ladder near the corner, can we attach brackets to the wall?
Answer: Yes if the attachment does not penetrate the wall. Refer to attached wall types. Refer to ICD/ICS 705 Requirements (pending).
W50S9C-22-B-0004
REPLACE B-120 CHILLER
QUESTIONS and ANSWERS
As of 8/2/22
8. Question: Are there any special requirements when we cap the pipes and conduit that penetrate the roof of the SAPF?
Answer: Yes, refer to attached ICD/ICS 705 Requirements (pending).
REMINDER – ALL QUESTIONS MUST BE SUBMITTED FIVE WORKING DAYS PRIOR TO
BID OPENING DATE (FRIDAY 5 AUG 22).
File details come from the government source that posted it. Updated .