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cleanliness is a virtue), electrical equipment is often housed in a separate room with ltered, fan-forced ventilation Some electronic gear needs to be in an air conditioned space Where many motors are involved in a plant, motor control centers (MCCs) are preferred to individual combination starters Large plants may have several MCCs to reduce the length of wiring runs The electrical service should have a degree of redundancy Hospitals and other critical-care facilities require access to at least two independent utility substations This carries into the large plant in the form of multiple transformers and segmented switch groups with tie breakers Standby power generation may be included in plant design in addition to backup power for life safety issues 4 Valving In central plants there is no substitute for isolation valves for every piece of equipment Multiple high-pressure steam boilers require double valving with intermediate vent valves to protect workers inside a unit that is down for maintenance Valves should be installed in accessible locations 73 Central Steam Plants
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Some general concepts of steam distribution were presented in Chap 6 Steam plants require considerations of siting, structure, and electrical service, as described in this chapter Boilers are the primary component of steam plants and are supported by a host of auxiliary components such as boiler feed pumps, deaerating feedwater heaters, condensate holding tanks, water softeners, blowdown heat recovery systems, water treatment systems, ue gas economizers, fuel-handling equipment, etc See Fig 71 Each component of the steam system is available in a range of quality and performance characteristics Selection depends on duty and on the sophistication of the plant operation Equipment for a smaller school will be of a different character than for a campus or an industrial plant With all the subjective differences, the technical calculations are similar Because condensate originates in heat exchange devices as a uid without pressure, it must drain by gravity to a collection point If a steam plant can be located at the low point of the served system, the entire condensate return line may ow by gravity Otherwise, intermediate collection points and booster pumps may be required An important aspect of a steam plant is the condensate storage vessel When a boiler res up after a time of setback or at the onset of a peak heating load, a signi cant amount of feedwater will be evaporated and sent out into the system with a time lag before any of the condensate will get back to the plant The storage tank must hold
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Figure 71 Steam plant diagram
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enough water to sustain the initial demand, and then it must have enough freeboard or residual capacity to accept the returning condensate after an evening load shutdown Failure to provide adequate storage is observed through storage tank over ow, with high makeup water rates and high treatment costs Small plants often use the feedwater heating tank as a combination storage-and-preheat vessel Most steam plants use a version of a feedwater heater to remove dissolved oxygen by bringing the feedwater to the boiling point This also tempers the water to reduce the potential for damaging the boiler with a shot of cold water Feedwater makeup to boilers is accomplished with feedwater pumps If feedwater is heated to near the boiling point, the pumps must have a low net positive suction head (NPSH) to avoid cavitation Small plants often have a dedicated pump for each boiler with a level control on the boiler drum which cycles the pump on a call for more water Larger plants usually have a continuously running pump for several boilers with modulating valves and automatic level controls to maintain a constant level in the boiler steam drum
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