P99 LOW PRESSURE BOILERS
EXAM QUESTIONS AND THEIR
EXPECTED ANSWERS
What does a flow control valve do in a hot water
heating system?
it functions like a check valve, which is a valve that permits
fluid flow in only one direction.
At what pressure do low pressure hot water boilers
operate?
below 160 psi and 250 degrees psi
What on the steam pressure demand starts and stops
the burner?
The pressure control. The pressure control is a switch that
starts the burner, controls the firing rate, or shuts down the
burner based on steam pressure.
What type of valve would work to relieve overpressure
in a hot water heating system?
A relief valve; a relief valve is a boiler fitting that protects a
hot water boiler from exceeding its MAWP. A relief valve is
used for liquid service only and is rated in British thermal
units (Btu) relieved per hour. It is located between the fuel
oil pump and the discharge valve.
In steam boilers overpressure is relieved in pounds of
steam. What is the measurement for hot water
boilers?
amount of heat in BTU's per unit of time
What are diverter fitting used for?
, to supply hot water to a heating unit while maintaining flow
to the next heating unit. Diverter fittings make it possible
for a single pipe to serve as a supply to and return from a
heating unit.
How often should a try lever test should be done on a
safety relief valve?
Once per month. A try lever test is lifted to the wide open
position for 5 sec to 10 sec and released, allowing the
valve disc to snap shut.
A temperature pressure gauge indicates the
temperature and pressure of what?
Hot water leaving the boiler. A temperature pressure
gauage is a boiler fitting that indicates both the
temperature and pressure of the water leaving the boiler.It
is installed on the front or top of the boiler for easy viewing
by the boiler operator. It was 2 scales. Hot water boilers
usually have a water pressure of 12psi to 18 psi in the
boilter at all times.
What is the most common cause of problems in a hot
water heating system?
Air trapped in the system
What is an aquastat?
A hot water boiler fitting that measures the water
temperature in the boiler and controls the temperature by
starting and stopping the burner.
What is the first thing a boiler operator does when
coming on shift?
Check the water level in the boilers
Why does a furnace explosion occur?
because of build up of fuel in the combustion chamber
The vent on a natural gas train is a
EXAM QUESTIONS AND THEIR
EXPECTED ANSWERS
What does a flow control valve do in a hot water
heating system?
it functions like a check valve, which is a valve that permits
fluid flow in only one direction.
At what pressure do low pressure hot water boilers
operate?
below 160 psi and 250 degrees psi
What on the steam pressure demand starts and stops
the burner?
The pressure control. The pressure control is a switch that
starts the burner, controls the firing rate, or shuts down the
burner based on steam pressure.
What type of valve would work to relieve overpressure
in a hot water heating system?
A relief valve; a relief valve is a boiler fitting that protects a
hot water boiler from exceeding its MAWP. A relief valve is
used for liquid service only and is rated in British thermal
units (Btu) relieved per hour. It is located between the fuel
oil pump and the discharge valve.
In steam boilers overpressure is relieved in pounds of
steam. What is the measurement for hot water
boilers?
amount of heat in BTU's per unit of time
What are diverter fitting used for?
, to supply hot water to a heating unit while maintaining flow
to the next heating unit. Diverter fittings make it possible
for a single pipe to serve as a supply to and return from a
heating unit.
How often should a try lever test should be done on a
safety relief valve?
Once per month. A try lever test is lifted to the wide open
position for 5 sec to 10 sec and released, allowing the
valve disc to snap shut.
A temperature pressure gauge indicates the
temperature and pressure of what?
Hot water leaving the boiler. A temperature pressure
gauage is a boiler fitting that indicates both the
temperature and pressure of the water leaving the boiler.It
is installed on the front or top of the boiler for easy viewing
by the boiler operator. It was 2 scales. Hot water boilers
usually have a water pressure of 12psi to 18 psi in the
boilter at all times.
What is the most common cause of problems in a hot
water heating system?
Air trapped in the system
What is an aquastat?
A hot water boiler fitting that measures the water
temperature in the boiler and controls the temperature by
starting and stopping the burner.
What is the first thing a boiler operator does when
coming on shift?
Check the water level in the boilers
Why does a furnace explosion occur?
because of build up of fuel in the combustion chamber
The vent on a natural gas train is a
