Att 8_GSA Func requirements.pdf

U.S. General Services Administration

Region 10

Public Buildings Service www.gsa.gov

Functional Requirements

PROJECT IDENTIFICATION

Project Title: Fairbanks FB Generator Replacement

Building Name: Fairbanks Federal Building

Building ID #: AK0029ZZ

Building Location: 709 W 9th ST, Fairbanks, AK 99801

A. Project Background:

1. Meetings, emails, or information:

Description Date Meeting Notes Link

Field Observation 8/8/2022 Field observation report

2. Building Background:

The Fairbanks FB was built in 1977.

3. Development Issue / Bonafide Need:

It was noted that the existing emergency distribution system does not meet NEC article 700 which applies to the installation of emergency systems that are essential for safety to human life and are legally required by state and federal. The three alternate emergency loads are emergency, legally required standby, and optional standby system. To comply with this article, three separate Automatic Transfer Switches, as well as individual distribution boards, are required. Refer to photo #7 for an illustration of the three different emergency loads and distribution systems. This is going to be expensive to fix so I do not recommend including this as part of the generator replacement project.

It was also noted that the existing electrical service and equipment is old and original to the building (1977). The equipment has been maintained regularly but have exceeded their service life. Note that the building is already rated as “High risk” in the R10 Owned Buildings Info & Systems Dashboard.

4. Documents and Resources:

One-line diagram

Drawings

Existing Arc Flash Study https://docs.google.com/document/d/1DPegaKMY2SQXpmPem_TranUSsK1OvKJPkGdV7EIu7mc/edit https://docs.google.com/spreadsheets/d/1qvGcSSR7_SbdL8lvYk5mSDk1_E0HbiB7i6eUgoF-KnM/edit#gid=1989486960 https://drive.google.com/drive/folders/18qRnJbtuBNHK1xZRzKFGCGwGhtrbLdEV https://drive.google.com/drive/folders/1yXxyQWdpUsx1SV4XlVenNjAoMmzrPrtH https://drive.google.com/drive/folders/1unMNLRcH6DGdwPZEZpiLIQecCEtTj22Q

5. Current Conditions:

● The existing 175kW diesel backup generator is in the basement dedicated emergency generator room. There is a fuel day tank located in the room which is as old as the emergency generator. The day tank is also connected to the building’s diesel fuel storage tank located outside the building. Refer to photos #1 thru 6 for existing conditions inside the electrical room.

● It was indicated that the current generator is not functioning, old and cannot obtain replacement parts. There is a rented portable generator in the front of the building that is currently serving as a temporary fix.

B. Scope of Work

1. Demolish and replace the existing 175kW, 480Y/277V (1800 RPM) diesel backup generator with similar size. New generator must be provided with a main overcurrent protective device.

2. New generators must be certified as fully EPA compliant at the manufacturing facility.

3. The generator coolant system is to be tied to the existing heat exchanger. The heat exchanger transfers heat to the cooling tower's closed loop cooling system.

4. Provide a permanently installed load bank, sized at a minimum of 50 percent of generator rating. The load bank shall be permanently installed in the fresh air adjacent intake room's east wall. The load bank must not hinder any other room components. The load bank must provide a load add/shed feature that will maintain load levels at a minimum, including building load, of the generator manufacturer's recommended loads when operating at 50 percent of generator KW nameplate. The load bank must have a minimum of four automatic load taps controlled by a load add/shed relay incorporated into the run circuit on the generator.

5. Seismically anchor/brace new generator and all equipment associated with it.

6. Utilize existing pad.

7. Demolish and replace all generator accessories (FA connections, battery connection, etc..) including the existing generator exhaust.

8. Remove the generator room day tank and replace with new properly sized day tank in the boiler mechanical room. Tank is to be large enough to support both the generator and boilers. Verify proper piping sizes and fittings to support new tank to equipment. Remove any unused fuel pipe from the main fuel piping system.

9. Install Government furnished Mobile Fuel Polishing System in the Fish and Wildlife basement storage room closest to the fuel tank. Polishing system will be programmed with an automatic fuel polishing cycle suggested by fuel polisher manufacturer.

10. Remove the continuously operating fuel recirculation motor and any unnecessary fuel lines. Verify properly installed check valves.

11. Demolish and replace the existing Automatic Transfer Switch (ATS) with N10 type (transfer of power within 10 seconds).

12. Fairly sized pull box (sized per NEC article 314) for future generator emergency feeder splicing to correct NEC article 700 deficiency (future project)

13. Generator annunciator panel (location to be determined during design/construction phase) with connection to the Fire Alarm Control Panel.

Additional remote annunciator panel(s) are optional.

14. Replace existing feeders associated with the generator replacement.

15. Connect generator and transfer panel status into the current building automation system.

16. Provide selective coordination study of the emergency system. Building system model (pdf) as well as input report (pdf only) can be provided. Contractor must confirm existing field data including but not limited to existing breaker sizes, types, conductor sizes, etc.

17. Refer to the one-line diagram in photo no.8 for additional information.

18. All work must comply with the latest versions of the P-100, NFPA and other codes that are applicable to this project.

19. Once the generator is replaced, a selective coordination study is required.

Recommend including this study as part of the replacement project. Fuses and circuit breakers have time/current characteristics that determine the time it takes to clear the fault for a given value of fault current. Selectivity occurs when the device closest to the fault opens before the next device upstream operates. Any fault on a branch circuit should open the branch-circuit breaker rather than the feeder overcurrent protection. All faults on a feeder should open the feeder overcurrent protection rather than the service overcurrent protection. With coordinated overcurrent protection, the faulted or overloaded circuit is isolated by the selective operation of only the overcurrent protective device closest to the overcurrent condition. The main goal of selective coordination is to isolate the faulted portion of the electrical circuit quickly while at the same time maintaining power to the remainder of the electrical system.

Photo no. 1: Existing Electrical room layout.

Photo no. 2: Existing 175kW generator (front view)

Photo no. 3: Existing 175kW generator (side view)

Photo no. 4: Existing 175kW generator nameplate

Photo no. 5: Existing Automatic Transfer Switch

Photo no. 6: Existing emergency distribution board

Photo no. 7: Illustration of the three different emergency loads and distribution systems

Photo no. 8: Existing Partial One-line diagram