boiler exam study guide 2
The bottom blowdown on a boiler ___. - Answer- removes sludge and sediment from the mud drum Boiler tubes are sized using the ___. - Answer- outside diameter A boiler fusible plug is brass or bronze with a core of ___. - Answer- tin Spalling in a boiler refers to ___. - Answer- hairline cracks in the refractory Boiler horsepower is the evaporation of ___ lb of water/hr from and at a feedwater temperature of 212°F. - Answer- 34.5 A siphon installed between the boiler and the pressure gauge protects the Bourdon tube from___. - Answer- steam temperature The pH of the boiler water should be ___. - Answer- 10 to 11.5 The boiler superheater raises the temperature of the ___. - Answer- steam leaving the boiler An economizer is used to preheat ___. - Answer- feedwater Fires caused by spontaneous combustion would probably start in the ___. - Answer- oily waste rags A high suction reading on the fuel oil pressure gauge indicates ___. - Answer- dirty strainers The ___ is a secondary means of determining boiler water level. - Answer- try cock A(n) ___ is used to measure furnace temperature. - Answer- pyrometer The range of a boiler pressure gauge must not be less than ___ times the safety valve setting. - Answer- 1 ½ Boiler feedwater is chemically treated to ___. - Answer- prevent formation of scale Pre
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