Attachment 23 - Addendum 3.pdf
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- Attached to
- CONSTRUCTION: Hangar 08 & 09 Mechanical Upgrades at the Mike Monroney Aeronautical Center, Oklahoma City, OK
- Solicitation number
- DTFAAC-17-R-00023
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Attachment 23 - Addendum 3 (pdf)
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Addendum No. 3 FAA Hangar 08 & 09 Mechanical Upgrades
SIR/RFO DTFAAC-17-R-00023 August 22, 2017
Work Order 2014-014040
Attachment 23
Addendum No. 3 forms a part of the Contract Documents and modifies the original bid documents. Items in this
Addendum take precedence over the original documents. Addendum No. 3 consists of the following:
1. Requests for Substitution(s) will be considered only after the contract is awarded. Proposals should be based upon the Contract Documents.
2. QUESTION: The schedule refers to “split coupled vertical In-Line (series 4300) pumps, yet the specs refer to “close coupled end suction” pumps. What type of pumps are to be used?
ANSWER: Schedule has been updated to match specifications.
3. QUESTION: Clarification of the cooling tower flow requirements: Schedule references 930 gpm, however per the original selection and the combined flow of the pumps equal 1050 gpm.
ANSWER: Chillers designed for 480 gpm each and tower shall match. Pumps shall turn down to 960.
4. QUESTION: Clarification on gear drive vs belt drive (cooling tower): Specs indicate belt drive; however the schedule notes indicate a “motor outside the airstream” configuration which requires the tower to be a gear drive.
ANSWER: Specifications have been updated to gear drive.
5. QUESTION: Schedule calls for sweeper piping; however there is no schedule or spec for the associated filter. Additionally, there are no specs for the “Pulse Water Treatment Equipment”.
ANSWER: Water filtration language has been added.
6. QUESTION: Plan M3.02 shows ‘1” DCW to new chemical water treatment system as detailed in specifications’. There is no specification for this system, and what is this new system?
ANSWER: Provide chemical treatment system as necessary to meet specification 232113.
7. QUESTION: Specification 232113 3.7D states ‘Add initial chemical treatment and maintain water quality in ranges noted above for the first year of operation’. Is this referring to only the condenser water system?
ANSWER: Included in Addendum #2.
8. QUESTION: Specification 232113 3.7E states ‘Fill heating water and chilled water piping with <insert number> percent ethylene glycol’. What is the percentage of glycol needed? Or, do these systems even have glycol in them?
ANSWER: Included in Addendum #2.
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