When cooling down a steam boiler that has been taken out of service, a vent valve on the steam drum should be opened to

When cooling down a steam boiler that has been taken out of service, a vent valve on the steam drum should be opened to

a) prevent a vacuum from forming in the boiler
b) release the air from the boiler
c) purge the shell of impure gases
d) let the operator know when the pressure has reached zero
e) prevent pressure build-up in the boiler






Answer: A

Just before entering the waterside of the boiler it is important to

Just before entering the waterside of the boiler it is important to

a) notify the inspector in writing of your intent to do so
b) ensure the chief engineer is aware of your intent
c) be wearing self contained breathing apparatus (SCBA)
d) test the atmosphere with an oxygen "sniffer"
e) obtain permission to do so from plant management





Answer: D

What pressure is a boiler subjected to during a hydrostatic test?

What pressure is a boiler subjected to during a hydrostatic test?

a. Operating pressure
b. 1/2 of normal operating pressure
c. 1 1/2 times maximum allowable working pressure
d. 1/2 times design pressure
e. 2 times the setting of the lowest set safety valve






Answer: C

An inhibitor, when added to acid, will:

An inhibitor, when added to acid, will:

a. Prevent or minimize the effect of the acid on the boiler metal
b. Make the acid compatible with the sewer system for disposal
c. Strengthen the acid, thereby shortening the cleaning procedure
d. Neutralize the acid residue remaining on the boiler metal after a chemical cleaning
e. Cause foaming in the boiler





Answer: A