Specifications include, but are not limited to: Central Utility Plant (CUP) This area provides the main hot water, chilled water, and steam for the majority of the central TAMU campus. The main site equipment includes: Combined Cycle Power Plant with a single drum HRSG operating at 600 psig (Boiler 1) Conventional Water Tube Boiler (600 psig) (Boiler 12) Package Fire Tube Boiler (60 psig) Boiler 2 Domestic Hot Water Heat Exchangers Heating Hot Water Boilers Chillers to provide chilled water to campus Three satellite buildings also have chillers and hot water boilers for the chilled and heating hot water loops. Combined Cycle Power Plant— The CCPP consists of a single drum HRSG commissioned in 2011 that generates 600 psig superheated steam. This steam feeds the 600 psig steam header that drives STG2, STG 4 and steam-driven pumps for the # 8 and #9 chiller compressor. The steam turbine exhausts at approximately 20 psig saturated steam. Steam also drives the chilled water pump. This steam is condensed in a surface condenser that is located below the turbines. Feedwater to the HRSG is fed through a preheater loop. From the preheater, the water goes to the HRSG deaerator (DA #1). The DA provides suction to the boiler feed pumps which discharge to the HP Economizer and HP Evaporators. Steam is separated in the HP Drum and goes to a superheater section in the front of the gas path. The superheater temperature on the HRSG is controlled using condensate (not feedwater from the DA). #1 DA is a spray-type deaerator with trays and DA#12 is a tray type deaereator. Boiler 12 is an O-style water-tubed natural-gas fired boiler built in 2002 that generates 600 psig superheated steam at 750°F into the 600 psig steam header system that feeds the turbines. Boiler 12 has its own deaerator (DA #12). Pressure is usually maintained on #12 boiler (unless the entire 600 psig steam system is out of service), even when the HRSG is generating all the required steam load. Boiler 2 is a Clever-Brooks fire-tube boiler that generates 60 psig of saturated steam. It can operate on fuel gas or natural gas. Most of the 60 psig is reduced to 20 psig in a let-down station. It has its own small deaerator directly above the feed tank. While this boiler does not supply steam directly to any turbine, it can supply steam to any of the three DAs, and thereby may have some affect the chemistry of the HRSG or Boiler 12. Boiler 2 will operate on natural gas or #2 fuel oil. Makeup Boiler water makeup is a combination of process condensate and makeup water. The makeup water is well water that passes through a single pass reverse osmosis (RO) skid. There is no polishing after the skid. The RO permeate is stored in T-0 and T-1 which are vented tanks. The process condensate is returned to T-3. However, the RO permeate tanks and process return tanks are tied together and T-3 overflows into T-1 mixing the quality of the tanks. Besides the steam turbines and steam-driven compressors/motors, steam is used to heat domestic hot water used by campus to 140°F. Some of these heat exchangers are old and occasionally leak some potable water into the return condensate. Central Campus Chilled and Heating Hot Water Loops There are two large chilled water loops that provide chilled water for the central campus. The Main Camus Chilled Water loop contains 1.2 million gallons. Chillers for this loop are located in the Central Utility Plant and in Satellite Utility Building #3 (SUP-3). The West Chilled Water loop contains 1.6 million gallons and chillers are located in Satellite Utility Buildings #1 and #2. The West Campus Loop also has a 3 million-gallon thermal energy storage tank. There are similar but smaller loops for the Heating Hot Water to provide heat to the buildings. The Main Campus Hot Water Loop contains 400,000 gallons, while the West Campus Hot Water Loop is slightly larger at 450,000 gallons. The chilled and heating water loops operate throughout the year. The loops generally have few leaks, with a target of 1% makeup per day. Domestic Hot Water Heat Exchangers Domestic hot water will be treated with an NSF-approved corrosion inhibitor. Cooling Towers Each Chiller has a cooling tower associated with it. There are also cooling towers dedicated to the two steam turbines (STG 2 and 4) and oil coolers on the combustion turbine. The towers are all concrete structures with basket fill. They are often grouped together as 2-4 cells. The groups are listed in the end of this document along with the volume of cooling water associated with each tower.