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99338 OPERATIONAL CONTROL AND MAINTENANCE INTEGRITY OF TYPICAL AND ATYPICAL COIL TUBE STEAM GENERATING SYSTEMS

Picture for 99338 OPERATIONAL CONTROL AND MAINTENANCE
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Product Number: 51300-99338-SG
ISBN: 99338 1999 CP
Author: Edward S. Beardwood
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Coil tube steam generators are low water volume to boiler horsepower (bhp) rating, rapid steaming units which occupy substantially less space per boiler horsepower than equivalent conventional tire tube and water tube boilers. These units can be retrofitted into existing steam systems with relative ease and are more efficient than the generators they replace. During the early ‘70’s they became a popular choice for steam generation in commercial, institutional and light to medium industrial applications. Although these boiler designs do not require skilled or certified operators, an appreciation for a number of the operational conditions that result in lower unscheduled maintenance, increased reliability and availability cycles would be beneficial to facility owners, managers, and operators. Conditions which afford lower operating and maintenance costs will be discussed fkom a practical point of view. An overview of boiler design and operation is also included. Pitfalls are provided for operational and idle conditions. Water treatment application, as well as steam system operations not conducive to maintaining long term system integrity; with resolutions, will be addressed. Keywords: coil tube boilers, boiler design, corrosion fatigue, high temperature oxidation, creep, oxygen pitting, corrosive pH, pretreatment, carryover, steam quality, mass balance.
Coil tube steam generators are low water volume to boiler horsepower (bhp) rating, rapid steaming units which occupy substantially less space per boiler horsepower than equivalent conventional tire tube and water tube boilers. These units can be retrofitted into existing steam systems with relative ease and are more efficient than the generators they replace. During the early ‘70’s they became a popular choice for steam generation in commercial, institutional and light to medium industrial applications. Although these boiler designs do not require skilled or certified operators, an appreciation for a number of the operational conditions that result in lower unscheduled maintenance, increased reliability and availability cycles would be beneficial to facility owners, managers, and operators. Conditions which afford lower operating and maintenance costs will be discussed fkom a practical point of view. An overview of boiler design and operation is also included. Pitfalls are provided for operational and idle conditions. Water treatment application, as well as steam system operations not conducive to maintaining long term system integrity; with resolutions, will be addressed. Keywords: coil tube boilers, boiler design, corrosion fatigue, high temperature oxidation, creep, oxygen pitting, corrosive pH, pretreatment, carryover, steam quality, mass balance.
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