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® WorleyParsons <br /> resources&energy <br /> — Manual pull stations <br /> — Interconnecting cabling <br /> — Natural gas and ammonia leak detection <br /> 3.6 Compressed Air System <br /> The compressed air system will be designed to supply service and instrument air for the <br /> facility. Dry, oil-free instrument air will be provided for pneumatic operators and <br /> devices throughout the plant. Compressed service air will be provided to appropriate <br /> areas of the plant as utility stations. <br /> The instrument air system will be given demand priority over the service air system. A <br /> pressure control valve will be set at approximately 85 psi to cut off the air supply to the <br /> service air header once the system pressure falls below that set point <br /> Two (2), 100 percent capacity packaged air-cooled air compressors will supply <br /> compressed air to the service and instrument air systems. The control system will be <br /> designed to allow either air compressor to become the "lead" and will provide <br /> instrument air system pressure indication and a low-pressure alarm. The instrument air <br /> system will include two parallel duplex instrument air dryers, a compressed air storage <br /> receiver, stainless steel piping, valves, instrumentation and controls. <br /> 3.6.1 Instrument/Service Air Requirements <br /> The total instrument air flow capacity is based on the total quantity of air users, capacity <br /> of each air user, an average load factor of 25 percent, plus an additional 50 percent <br /> margin to account for air leakage. All instrument air will pass through the air dryers. <br /> Instrument air will be dried to a dew point of-40 degrees F. <br /> 3.6.2 Service Air Requirements <br /> Utility hose stations will be located as necessary throughout the plant to allow all <br /> equipment to be accessed via air hose. Each hose station will have with a ball valve, an <br /> anti whip valve and a quick disconnect coupling. <br /> 3.6.3 Emergency Air Compressor Connection <br /> An emergency air compressor connection consisting will be located in the air header <br /> ahead of the compressor discharge air receiver and in a location reachable by a portable <br /> air compressor air hose. This connector will be sized for at least the same flow rate as <br /> one of the plant air compressors. An oil trap will be supplied at the emergency <br /> connection to prevent oil from the emergency air compressor entering the instrument air <br /> system. <br /> Lodi Energy Center 3.3 - 10 LEC AFC <br /> 071508 Rev.A <br />