RFIs for W50S8621B0001 as of19 July 21.pdf

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Attached to
TDVG212456 Replace Chiller Unit Building 125
Solicitation number
W50S86-21-B-0001
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RFI documents W50S8621B0001

1. Is there glycol in the system? If yes, what type and mixture ratio

Response: Yes, the type is a 50% mixture of Noburst and Ethylene glycol, to be removed, flushed and disposed of properly by the contractor.

2. Can the glycol that is removed be re‐used?

Response: No, due to the mix of two glycols, we require a 50% mix of Noburst only. Noburst is our standard glycol used on Base.

3. Are there chemicals in the water/glycol?

Response: No.

4. What pipe size is coming out of the ground for chiller connection?

Response: 4”

5. Are the pipe joints welded or vic?

Response: Victaulic, piping to be replaced to last 90 degree elbow, past the flow switch. The flow switch, Armaflex, piping, fittings and valves to be replaced with new.

6. Please provide the model and serial number of all the chiller pumps that need to be replaced.

Response: Pump model # KV3009 Taco pump. The Motor model # B075B U.S. Electrical Motors. Could not find serial #s

7. Please provide the concrete pad size the existing chiller us currently sitting on.

Response: The existing pad is 11’‐4” (136”) x 16’‐8” (200”) interior CMU wall dimensions. The ACRTC/CE Structures Shop will modify the CMU wall and extend the concrete pad, once the contractor provides actual dimensions of new chiller.

8. From the manufacturer regarding the taco pump, please provide exact application, confirm 3” flanges, material of constructions, working pressure, working temperature, impeller diameter and/or GOM and feet of head and all motor information.

Response: Regarding the Taco Pump: PLEASE USE THE ATTACHED CONSTRUCTION SUBMITTAL FOR

VERIFICATION.

please provide exact application confirm 3” flanges = 3 inch material of constructions: (NOT SURE IF THIS IS WHAT YOU ARE ASKING) Casing = Cast Iron; Impeller = Red Brass; Shaft = St. Steel; Shaft Sleeve = Bronze; Mech Seal = Ceramic; Seal Flush Line = Copper.

PLEASE USE THE ATTACHED CONSTRUCTION SUBMITTAL FOR VERIFICATION.

working pressure:

working temperature: 250 Degrees Fahrenheit impeller diameter: 9 inch

GPM: 170

feet of head: 80 Feet all motor information: PLEASE SEE ATTACHED PHOTO OF MOTOR PLATE

9. In response to the previous RFI answers, due to the glycol needing to be replaced, please provide the estimated amount of glycol the system will need.

Response: B125 – 800 gal for a 50% mix of water and Noburst for flush quantity. Total refill Noburst at 50% would be 400 gal glycol/400 gal water.

10. The SOW has very little information on the electrical system. Could you please provide more information on the electrical service for Bldg. 125?

Response: please see attached photographs from the job site.

File details come from the government source that posted it. Updated .