J-6 MSP - Addendum 1 Items Rev 1.pdf
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- Solicitation number
- 697DCK-20-R-00070
About this file
This addendum provides additional items and clarifications to be included in the MSP Boilers, Pumps, and PCS Room HVAC Project solicitation for the Minneapolis Air Traffic Control Tower facility replacement project. Key additions include replacing existing motor controllers and disconnect switches serving various pumps and boilers, expanding exhaust stack sizes, adding gas and water leak detection alarms integrated into the facility BAS system, installing new pumps and accessories, and providing supplemental temporary heating and dehumidification during construction. The addendum also clarifies control sequences and modifies notes and details on the contract drawings. Offerors must include all addendum items in their proposals, which are due by March 27, 2020 for the Department of Transportation Federal Aviation Administration to replace critical HVAC and boiler infrastructure at the Minneapolis ATCT facility.
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Date: 3-18-2020
PROJECT: MSP BOILERS, PUMPS, AND PCS ROOM HVAC PROJECT
Solicitation No: 697DCK-20-R-00070
SUBJECT: ADDENDUM #1
Additional items and clarifications to be included into the above project:
No REFERENCE List of Items to be added to contract 1 J-1 SOW Section 1.1
#21 and Specification Section 01010 1.1 A.
21. (New Item)
Replace existing motor controllers and disconnect switches serving HWP-1, HWP-2, B-1 and B-2. Note: Match type and size of existing motor controllers and disconnect switches with Square D equivalent for HWP-1, HWP-2, B-1 and B-2. Existing HWP-1 and HWP-2 controller/disconnect are Westinghouse A206S2MGA-BJ1LT Size: 2,Coil: 120V 60Hz, Rating: 50 AMP MCP 3PH 3Pole 25HP @ 480V. Options: Hand-off-Auto Selector Switch, 1 Extra Aux Contact (1NO-1NC) Unwired, Red/”Run” Light Wired Across Coil, 480V to 120V Control Power Transformer. See ref. photo
IMG_6217.JPG
Existing B1 and B2 disconnects are Cutler-Hammer 30 Amp. Heavy Duty Safety Switch DH361UGK See ref. photo IMG_6221.JPG & IMG_6226.JPG
2 MSP-D-ATCT-M033
(Detail 4)
GL-E-2324-M16
(detail 3)
Specifications 235100
Furnish and install a new 16-inch stainless steel metal exhaust stack and accessories to the roof. The combined horizontal section of the stainless steel metal exhaust stack shall be changed from 8-inch to 16-inch. The new vertical stainless steel exhaust stack from the boiler room to the roof shall also be 16-inch. Per specification 235100.
MSP-D-ATCT-M027
Detail 1
Remove duct detector shown in Detail 1. Use ceiling detector option to shut down CRAC units. Program BAS as required.
4 MSP-D-ATCT-M027 Change Note-3 from “NEW CRAC UNOTS” to “FACILITY BAS
SYSTEM”.
5 Specifications 230900
Upgrade facility BAS System, including graphics update, for new boilers and new CRAC units.
6 MSP-D-ATCT-M030
Note 18.
Flush the entire facility hot water loop and refill with new glycol 50/50 mix.
System capacity approximately 2200 gallons.
7 J-1 SOW Section 1.1 #22 and Specification Section 01010 1.1 A.
22. (New Item)
Furnish and install Gas leak detection alarms, associated accessories, wiring and conduit in the boiler room. Gas leak detector shall be wall mounted and integrated with existing Johnson control automation system. See the attached product reference brochure description and model number (Quantity:1 - Honeywell Gas detector – BW01 E3 Point)
8 MSP-D-ATCT-M030
Detail 2 & Note 10.
Furnish and install chemical pot feeder and expansion tank to match existing as shown on drawing.
9 MSP-D-ATCT-M031
& Specification Section 231410.
Furnish and install ball valves for all shutoffs and isolation valves on Boilers, Pumps, and CRAC unit as shown on contract drawings. Coordinate all locations all valves replacement phasing with COR. Note: All valves shown on drawings are to be ball type valves even if drawing indicates different type.
10 MSP-D-ATCT-M031
& Specification Section 232123
Furnish and install new pumps and accessories to match existing manufacturer platform to account for pump rigidity, flexing, and alignments.
Grout platform as necessary. After pumps installation, they will undergo extensive test/balance to determine correct flow, shaft alignment, and pumps vibration according to pump manufacturer’s recommendation. Pumps test and balance report shall be provided to the COR.
11 MSP-D-ATCT-M032
Note 2.
Program the boilers & CRAC units to automatically be rotated via the facility Building Automation System (BAS) on the first & fifteenth of the month.
12 MSP-D-ATCT-M032
Detail 2
Change “Building Hot Water Supply Temp” point name to “Boiler Hot Water Supply Temperature”
13 J-1 SOW Section 1.1 #23 and Specification Section 01010 1.1 A.
23. (New Item)
Furnish and install water leak detection alarms in boiler room, locate by drains and integrated into the facilities BAS system. Quantity 2 Note: provide leak detection systems PCS room and the boiler room drain lines (Known source: Liebert Liquit-Tec LP6000 with LCD display)
14 J-1 SOW Section 1.1 #24 and Specification Section 01010 1.1 A.
24. (New Item)
Furnish and install hot water loop filter housing / filters on boiler suction and discharge loop. Also provide filters for the boilers circulating pumps suctions and discharge loop. See the attached product reference brochure descriptions and model number: (Quantity:4 BoilerMag Filter BMXT200/4/AAV)
15 J-1 SOW Section 1.1 #25 and Specification Section 01010 1.1 A.
25. (New Item)
Provide supplemental heat in critical of the facility such as the TRACON and CAB during construction work on the Boilers when the heating loop is for extended longer periods of time. Also provide temporary de-humidification units to supplement the air handlers cooling requirements.
16 J-1 SOW Section 1.1 #26 and Specification Section 01010 1.1 A.
26. (New Item)
Furnish and install two isolation ball style shut off valves for the chill water lines on the far north end of first floor hallway. These shutoff valves supply the chill water lines serving the two Roof Top Unit (RTU’s) serving the TRACON, thus, there will be no cooling of the TRACON when lines are shut down & drained. Work will need to be accomplished during nighttime hours 2300 – 0500 the following day. Coordinate work hours with COR.
17 J-1 SOW Section 1.1 #27 and Specification Section 01010 1.1 A.
27. (New Item)
Fume mitigation is required for the recovery of the heating loop water. This water will contaminate surrounding air in a matter of seconds. If the fumes seep into occupied areas we will have a very BIG issue to deal with. Liquid and fume containment is very critical and must be planned and accomplished.
Provide exhaust fans for all work areas during construction to mitigate fume mitigation into critical system such as heating loop water and surrounding areas where the fumes could affect Air Traffic personnel.
18 J-1 SOW Section 1.1 #7 and Specification Section 01010 1.1 A.
7.
Change 250 to 55 gallon. Remove “condensate drain connection”, as condensate will be treated & discharged into the facilities basement Sewage Ejection Pump Station.
19 Specifications 235216 2.2 I. 7.
Controller shall have the option for outside reset, of boiler operating temperature. Out-side air temperature sensor, header sensor, communication gateway and boiler sequencing technology (BST) to be furnished according to manufacturer’s recommendations.
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