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A.double bottom fuel oil tank temperature
B.heater supply steam flow
C.pressure of the fuel supplied to the burners
D.attemperator steam flow in the heater discharge circuit

A.have no plating joints of 90
B.retain the lube oil as long as possible before it recirculates through the system
C.provided drain/return lines that are no greater than 24 inches from the pump suction
D.be provided with only a perfectly horizontal bottom