silo 3 - U.S. Department of Energy

6.1.2 Supply Air System (System 70)
Process Description for the Silo 3 Project
Document No. 40430-RP-0003, Rev. 1
Jacobs Project No. 35H19605
September 5, 2003
The Supply Air System comprises Packaged Air Conditioning Units 1, 2, and 3 (ACU-70-
5700, -5710, and -5720). These units draw in ambient air, heat or cool the air (as dictated
by ambient conditions), and distribute it to various "clean, " normally occupied roomslareas
at the head end of the cascade ventilation system. Only two of the ACUs operate at a
time, with the third on standby.
6.1.3 Exhaust Air System (System 71)
Air from "clean" roomdareas is drawn into those roomdareas with a higher potential for
contamination. Exhaust air is directed to HEPA filters and discharged to the Exhaust Stack.
The Exhaust Air System comprises: Building Filtration Exhaust Fans A&B (FAN-71 -5760
A&B); and Building ULPA/HEPA Exhaust Modules A&B (FLT-71-5770 A&B).
The building ventilation/exhaust system collects air streams from all rooms and areas on
the cascade system (see Table 6-1) and routes them through a system of galvanized steel I
ductwork to the Building ULPA/HEPA Exhaust Modules A&B (FLT-71-5770 A&B). Each of
the two exhaust modules includes roughing filters, HEPA filters, ULPA filters, in-place test
sections, transition pieces, and isolation dampers. Housings for the exhaust modules are
s t a in I e ss s t ee I , s id e-a cc e ss , "bag - i n/ ba g- o ut " housings' ' .
Each of the two exhaust modules is sized for 100 percent airflow (i.e., approximately
7,200 acfm). Air is pulled through the exhaust modules by one of two centrifugal exhaust
fans (FAN-71-5760 A&B). Exhaust air is discharged from the fans to the Exhaust Stack
(see Section 4.4.5).
6.2
PLANT AND INSTRUMENT AIR SYSTEM (SYSTEM 40)
The following PFD and P&IDs illustrate the Plant and Instrument Air System:
94X-3900-F-0 1 432 F0005 Plant, Instrument, and Breathing Air Systems
94X-3900-N-01441 NO1 08 Plant Air System
94X-3900-N-01444 NO 1 1 1 Plant Air System Connections
94X-3900-N-0 1446 NO 1 1 3 Instrument Air System Connections
The Plant and Instrument Air System provides both compressed and instrument-quality air
for various end users such as baghouse and cartridge filter pulse jets, air-operated valves,
and miscellaneous instrumentation.
6.2.1 Plant/lnstrument Air Equipment (SKD-40-5300)
-The-P-lantllastrument A ir ComDressor Skid (SKD-40-5300) is a fully self-contained, structural
steel skid unit. All components are purchased piped and wired, and ready for installation upon
receipt. The skid includes, but is not limited to, the following equipment:
8 ACP-40-5320A&B: Air Compressors A&B
8
ART-40-531 0: Instrument Air Receiver Tank
8 ADR-40-53 1 2A&B: Desiccant Vessels A&B
" The "bag-in/bag-out" feature minimizes the potential of releases during filter changes.
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