Questions_for_the_FTC_Chiller_Replacement_Project.docx

Questions for the FTC Chiller Replacement Project Sol# FTC-13-P-3003

1. What is the required GPM's for the new chill water pump? Approximately 144gpm (based on standard rule of 2.4gpm per ton [2.4 x 60 = 144]) Winning contractor shall verify this when commencing design phase.

2. How far is it from the breaker panel or MCC to the new chill water pump? Approximately 190’ to the switchgear room. (However, you may use the existing source at the disconnect within the room as long as it is adequate to the spec of the equipment installed.)

3. What size is the chilled water pipe at the pump? 2”

4. In the statement of work (a.,iv.) it says that the recovered refrigerant will be turned over to the FTC prior to removal of chiller. Will FTC be providing the contractor with the recovery tanks for this task? Yes, FTC has tanks for this task.

5. Is there an exhaust system currently in the chiller room? No. If so, is it wall mounted or roof mounted? The new exhaust system will have to be facilitated via contractor installed ductwork emplaced above the doors leading to the 7th street moat. This will require moving at least one small conduit and its attached light.

6. Is there liquidated damages for this project? No

7. Is a bond required? No

8. Will the contractor be provided parking during this project? As a courtesy, FTC will provide a “sidewalk pass” for one (1) company truck to park near the area where work is done. However we cannot guarantee that D.C. authorities will be as accommodating as they have been over the years we have been doing this.

9. What is the process for acquiring a burn permit at FTC? Let the building manager or assistant manager know approximately 4 business days prior to need and he will make arrangements with the GSA Fire Alarm Shop.

10. Will the contractor be required to work after normal working hours during this project? No, work can be done during regular hours as long as it doesn’t create noise, smoke, dust or other excessive condition that negatively impacts ordinary business of the FTC. Given the exterior location – this is unlikely to be a problem.

11. Will existing building plans be provided? These will be required to confirm the cooling demand (what spaces it serves) and to determine the location of existing mechanical & electrical equipment. We can provide access to spaces and any floor plans in our possession upon commencement of engineering by the contractor. There do not currently exist a separate set of plans which only show the specific areas served by the existing chiller. The load has not changed in many years and is unlikely to at this point in time. Also, 60 tons has been quite adequate for the spaces served.

12. The construction period is stated as 20 Oct 2013 - 30 Nov 2013, and the RFP calls for (4) submissions 30%, 60%, 90% and 100%. In addition, there will be a lead time on the equipment. Is this schedule correct? Oct 20 should be regarded as commencement of work – to mean surveying/engineering etc. Demolition, installation & completion may take place during the cooler months – not to exceed final completion and turn-over prior to December 31 2013. Equipment should be ordered at time of award so that onsite work can begin on 20 October 2013.

13. Is there a budget on the project? Is it subject to availability of funds? The budget will not be disclosed. The project is not subject to availability of funds

14. The RFP reads "Contractor shall confirm tonnage..." does this require a cooling load calculation or are we confirming the existing equipment sizes? The load has not changed in many years and is unlikely to do so at this point in time. Also, 60 tons has been quite adequate for the spaces served.

15. The Scope of Work calls for the new chiller to be a split system, air-cooled, remote condenser, and multiple compressor type; however, the McQuay model used as the basis of design (WGZ060D) is a water cooled chiller. Please clarify which type of chiller is required.

The chiller required is to be air-cooled via remote condenser.

See McQuay literature attached page 3. “McQuay Type WGZ water chillers are designed for indoor installations and are available with water-cooled condensers (Model DW), or arranged for use with remote air-cooled or evaporative condensers (Model DA).”

We apologize for any ambiguity due to model numbers.

Of course, this is the basis of design, namely, a split system, air-cooled, remote condenser with multiple compressors.

16. One further clarification not otherwise raised here, but, mentioned during the site survey: Scope of Work section A. v. 5. “The new condenser(s) dimensions shall be such that it/they are below the height of the moat wall.” This can be further clarified to say “Height of new condenser(s) cannot exceed that of the existing ones.”