Principles of naval engineering - Historic Naval Ships Association

PRINCIPLES OF NAVAL ENGINEERINGCONDENSATERETURN LINESSUPERHEATEROUTLETFigure 11-32.— Jerguson superheater steam flow indicator.98.96systems, are controlled by one variable only—namely, the water level variation in the steamdrum. Hence single-element regulators are notable to compensate for swell and shrink.Single-element regulators are intended primarilyfor keeping the boilers supplied withfeed water in battle or under other conditionswhen manual feeding of the boilers might becomedifficult or impossible. These regulatorsmust be cut in immediately when General Quartersis sounded. They may also be used atother times, and in fact should be used frequentlyenough to keep them in good workingorder and ready for use under emergency conditions.Single-element regulators can control thewater level within acceptable limits under relativelysteady steaming conditions, but not undersevere maneuvering conditions. Since completereliance cannot be placed on the single-elementregulator, a checkman must remain on stationand be ready to take manual control if necessarywhen the single-element regulator is in use inother than emergency conditions.A single-element automatic feed water regulatoris shown in figure 11-37. An inner tube,enclosed by a generator, is connected to theboiler steam drum through valves A. and B.Thus the water level in the inner tube is dependentupon the water level in the steam drum.306