Basic fittings for Hot Water boilers

Question 1

The combined pressure temperature relief on a domestic hot water boiler prevents:

A) Energy waste
B) Heated water from becoming steam at atmospheric pressure
C) Reverse flow
D) Heated water from becoming steam at atmospheric pressure
E) The water from being too hot to cause injury

Answer 1

E) The water from being too hot to cause injury

Question 2

Water expansion generated by heating in a boiler system:

A) Lifts the safety valves on the boiler
B) Is absorbed by the flexing of the boiler shell
C) Compresses the air cushion in the expansion tank
D) Is removed by reverse osmosis
E) Goes out the overflow

Answer 2

C) Compresses the air cushion in the expansion tank

Question 3

In a hot water system, if the pressure pointer on a pressure or altitude gauge falls below the altitude pointer, it means that the system:

A) Temperature is too low
B) Temperature is too high
C) Has too much water
D) Is not full of water
E) Is over pressured

Answer 3

D) Is not full of water

Question 4

A pressure or altitude gage for a hot water boiler:

A) Does not require a syphon
B) Shall have a dial scale at least 3 times the MAWP
C) Must be of 51 mm pipe size
D) Must have a temperature dial
E) Must be equipped with a syphon

Answer 4

A) Does not require a syphon

Question 5

Before the try lever test on a water system operating above 60°C is attempted, the operator must ensure that:

A) The pressure is at least 75% of the valve set pressure
B) The boiler is at maximum pressure
C) The boiler is in operation
D) The boiler inspector has requested it
E) There is no load on the boiler

Answer 5

A) The pressure is at least 75% of the valve set

Question 6

Loss of air in the expansion tank is likely caused by an air leak on the:

A) Gauge glass fittings
B) Heating valve fittings
C) Inlet fittings
D) Drain plug
E) Boiler safety valves

Answer 6

A) Gauge glass fittings

Question 7

A combined temperature pressure relief is used on a:

A) High pressure boiler
B) Steam heating boiler
C) Hot water heating boiler
D) High temperature hot water boiler
E) Domestic hot water boiler

Answer 7

E) Domestic hot water boiler

Question 8

Hot water boilers have stop valves in their inlet and outlet piping:

A) So that the boiler can be drained without draining the system
B) So that each boiler can have separate water treatment
C) To allow for better warm-ups
D) To permit annual maintenance
E) To prevent water from entering another in service unit

Answer 8

A) So that the boiler can be drained without draining the system

Question 9

The combined pressure and temperature relief device must be installed:

A) Within the top 6 inches of the domestic hot water boiler
B) Within the top 12 inches of the domestic hot water boiler
C) At the center of the domestic hot water boiler
D) Near the bottom of the domestic hot water boiler
E) At the rear of the domestic hot water boiler

Answer 9

A) Within the top 6 inches of the domestic hot water boiler

Question 10

A combined pressure temperature relief valve:

A) Operates at 150°C
B) Uses a spring thermostat
C) Operates at 99°C
D) Operates at 75°C
E) Operates at 210°C

Answer 10

C) Operates at 99°C

Question 11

In a closed expansion tank system an air separator:

A) Is installed at the boiler inlet
B) Removes air from the system
C) Is installed at the boiler outlet
D) Directs air into the expansion tank
E) Is not required

Answer 11

D) Directs air into the expansion tank

Question 12

Liquid water:

A) Decreases substantially in volume when under pressure
B) Increases in volume when heated
C) Decreases in volume when heated
D) Transmits pressure unevenly
E) Expands substantially under vacuum

Answer 12

B) Increases in volume when heated

Question 13

Safety valves lifting on the boiler during operation may be caused by:

A) Excess air in the expansion tank
B) Insufficient air in the expansion tank
C) Insufficient make up supply pressure
D) Air in the system
E) Lack of boiler water treatment

Answer 13

B) Insufficient air in the expansion tank

Question 14

The correct amount of air in an expansion tank is indicated by a water level in the bottom of the gauge glass of:

A) ⅔ of the gauge glass
B) ⅞ of the gauge glass
C) ¼ of the gauge glass
D) ½ of the gauge glass

Answer 14

D) ½ of the gauge glass

Question 15

The temperature indicator of a hot water boiler should indicate water temperature:

A) At the boiler inlet
B) In the boiler
C) At the boiler outlet
D) In the expansion tank
E) Midway through the system

Answer 15

C) At the boiler outlet

Question 16

When Changing a gauge glass on an expansion tank:

A) Tighten the packing nuts as hard as possible
B) Check the old glass for nicks and scratches
C) Check the new glass for scratches and nicks
D) These gauge glasses cannot be replaced and a new tank is required
E) Repair and reuse the broken gauge glass

Answer 16

C) Check the new glass for scratches and nicks

Question 17

An auto fill valve used to keep the system filled with water will maintain a typical pressure of:

A) 60 psi
B) 15 – 18 kPa
C) 30 psi
D) 20 kPa
E) 15 – 18 psi

Answer 17

E) 15 – 18 psi