B09-Amd0002-RFIs_1-9_0002.pdf

Replace Cooling Tower #1, Condenser, Circulator Pumps, and

Valves at Boott Cotton Mill #6

Lowell National Historical Park

RFI #1:

1. Are we bidding based on Section 01 11 00 Summary of Work with one 384 GPM pump ( I assume this is pump 1 one on plan M3) and two 500 GPM pumps (I assume this is pump 4&5 on plan M1) with option

1 OR Scope of Work with one 384 GPM pump (I assume this is pump 1 one on plan M3) and one 500

GPM pump (I assume this is pump 5 on plan M3) with option 1? Sheet M3:

Pump #5 Condenser Pump is 500 GPM, 70’ Head.

Pump #1 Chilled Water Circulator Pump is 384 GPM, 90’ head.

Option 1: Circulator Pump #6 on drawing M3 (labeled #4 in field) is 408 GPM, 140’ Head.

Additional information from 1994 construction documents (as name plate not legible):

Manufacturer: Aurora Model #411, RPM 1750, BHP-20 Motor 30 Hpwr, NPS-hr feet: 10, Head ft: 140. Split case, fluid: water/glycol, temp 23-60.

Main Mechanical Room

Condenser Motor

Condenser Pump

Condenser Pump 500 GPM 70 Ft head

Chilled Water Motor

Chilled Water Pump 384 GPM 90’ Head

Option 1: Chilled Water Pump 408 GPM 140’ Head

Option 1: Chilled Water Pump 408 GPM 140’ Head

2. What are we considering a control valves? Are these the NC manual valves on plan H7 and are we changing 4 per Scope of Work OR 6 per Section 01 11 00 Summary of Work?

Sheet H17 indicates 2 manual isolation valves per pump.

3. What are we considering as an automatic control valve? Are these the motorized valves on plan M1 and

M3 and which one do we want to change? There are no automatic control valves or motorized valves that isolate the pumps.

4. Is there a contact for Trane Controls? Contact Tom Barone, Trane Commercial– New England, (781)

779-9700.

5. Please confirm if we are required to match the cooling tower, pump, valve, pipe, VFD, and electrical information shown on the schedules and drawings? Intention of the SOW is to Replace-in-Kind for cooling tower, pumps, valves, piping and replace VFDs as specified or indicated. As Equal

Substitutions are permissible with preapproval from the Contracting Officer.

6. Are the schedules in the back of the specifications current contract requirements, or are they existing/original design information provided for reference? The drawings and schedules included in the package are being utilized to help explain the location of components and the original design information. The Replace-in-Kind pumps should be utilizing the current tags as indicated on Sheet

M3.

7. If the schedules are to be followed, please confirm that the listed equipment sizes, pipe sizes, valve sizes, electrical requirements, and control points are correct for this project. The piping and equipment sizes shall match existing. The electrical requirements shall be compatible with the existing and proper for the proposed equipment.

8. If the schedules are reference only, please provide the current required cooling tower schedule, pump schedule, valve schedule, pipe sizes, VFD schedule, electrical requirements, and controls requirements.

The drawings and schedules included in the package are being utilized to help explain the location of components and the original design information. The SOW shall be to Replace-in-Kind existing installed equipment. Refer to the Tags indicated on M3. The existing Cooling Tower to be Replaced-in-Kind as VTL-171-L, manufactured by Baltimore Aircoil Company or a preapproved equal. The electrical requirements shall be compatible with the existing and proper for the proposed equipment.

9. Please confirm whether the replacement cooling tower and pumps are to match the scheduled equipment exactly, or if approved equals may be submitted provided they meet capacity, footprint, weight, connection, electrical, and control requirements. The existing Cooling Tower to be Replaced-in-Kind as VTL-171-L, manufactured by Baltimore Aircoil Company, or preapproved equal. The unit shall be a low-rise roof unit not to exceed the current structural height and weight requirements of the roof.