Marine Boiler Safety Systems A7

What is the primary function of a safety valve?

• To regulate the flow of steam to the main engine.

• To prevent the boiler pressure from exceeding a safe working limit.

• To blow down sediment from the boiler.

• To indicate the water level in the boiler.

Which of the following is a non-return valve fitted in the feedwater line of the boiler?

• Main steam stop valve

• Auxiliary steam stop valve

• Feed check valve

• Scum valve

What is the purpose of a scum valve on a boiler?

• To drain the boiler completely during maintenance.

• To remove impurities that float on the water surface.

• To release air and non-condensable gases from the boiler.

• To allow for internal inspection.

The blowdown valve is a boiler mounting used for what purpose?

• To prevent a vacuum from forming inside the boiler.

• To release excess steam pressure.

• To remove solid impurities, sediment, and sludge from the lowest part of the boiler.

• To measure the pressure of the steam inside the boiler.

What is the function of an air vent valve?

• To release steam when the boiler pressure is too high.

• To blow down the boiler to remove impurities.

• To prevent the accumulation of air and other non-condensable gases.

• To shut off the steam from the boiler.

Which boiler mounting is used for the visual inspection, cleaning, and repair of the boiler?

• Pressure gauge

• Water level gauge

• Manhole

• Safety valve

A water level gauge is a boiler mounting that is used to:

• Control the water level automatically.

• Indicate the water level inside the boiler.

• Add water to the boiler.

• Drain water from the boiler.

Which valve is fitted in the main steam pipe and is used to shut off steam from the boiler?

• Blowdown valve

• Scum valve

• Main steam stop valve

• Feed check valve

Which of the following is an example of a boiler mounting that is a type of safety device?

• Water level gauge

• Safety valve

• Pressure gauge

• All of the above

What is the main function of an auxiliary steam stop valve?

• To regulate the amount of steam being supplied to the auxiliary steam line.

• To blow down the boiler water.

• To remove surface impurities.

• To release excess pressure.