Book 1 Chapter 6: Basic Fittings For Hot Water Boilers Flashcards
The scale on the dial of a pressure gauge shall have a maximum graduation of ________ times the pressure at which the pressure relief valve is set to open.
A) 4.0
B) 3.5
C) 2.5
D) 1.5
B) 3.5
Where should the pressure relief valve be installed in a hot water system?
Anywhere reasonably close to the tank
The wax filled sensor probe in a combination pressure-temperature relief valve will expand and open the valve by means of a piston at approximately:
A) 50C (122F)
B)110C (230F)
C) 99C (210F)
D) 134C (273F)
C) 99C (210F)
The maximum size of the blowoff or drain connection on a hot water heating boiler is:
A) NPS 1/2 (DN15)
B) 25mm OD
C) NPS 3/4 (DN20)
D) 2 inches ID
C) NPS 3/4 (DN20)
The automatic fill valve is a/an ___________ valve, which keeps the system filled with water and maintains a set pressure in the system.
A) pressure reducing
B) air vent
C) back pressure
D) pressure control
A) pressure reducing
The relief valve on hot water boilers with a working pressure of up to 414 kPa(60psi) should open with in a variation of _______below or above the set point.
A) 5%
B) 20kPa (3psi)
C) 10kPa (1.5psi)
D) 14%
E) 30kPa (4.5psi)
B) 20kPa (3psi)
The minimum size of the hot water boiler bottom blow off or drain connection shall be:
A) 15mm (1/2in)
B) 6mm (1/4in)
C) 75mm (3in)
D) 19mm (3/4in)
E) 25mm (1in)
D) 19mm (3/4in)
The highest pressure to which the scale on the pressure gauge of a hot water boiler may be graduated is_____ times the pressure at which the pressure relief valve is set.
A) 3.5
B) 2
C) 1.5
D) 2.5
E) 3
A) 3.5
The wax filled sensor probe in a combination pressure-temperature relief valve will expand and open the valve by means of a piston at approximately:
A) 60C (140F)
B) 110C (230F)
C) 134C (273F)
D) 50C (122F)
E) 99C (210F)
E) 99C (210F)
The purpose of the expansion tank in a hot water heating system is to:
A) Separate the water and steam produced
B) Provide storage space for excess water
C) Provide storage space for excess steam
D) Add make-up water to the system
E) Provide space to store the returning condensate
B) Provide storage space for excess water
The automatic fill valve is a ______ valve which keeps the system filled with water and maintains a set pressure in the system.
A) Back pressure valve
B) Pressure reducing valve
C) Temperature control valve
D) Pressure control valve
E) Air vent valve
B) Pressure reducing valve
The pressure relief valve is typically installed on the boiler or reasonably close to the boiler outlet with:
A) A ball valve for isolation
B) A globe valve for isolation
C) A plug valve for isolation
D) No valve between
E) A gate valve for isolation
D) No valve between
The discharge piping from the relief valve should be piped to a safe point of disposal and can be:
A) Connected to the deaerator
B) Connected to any vent
C) Connected to the condensate tank
D) Terminated above a floor drain
E) Connected to any drain
D) Terminated above a floor drain
The operating handle of the valve to the pressure gage on a hot water boiler must be of the:
A) Hand wheel type
B) Solenoid type
C) Tee or lever handle design
D) Diaphragm type
E) A valve is not permitted in this location
C) Tee or lever handle design
On a hot water boiler, the highest value on the graduated scale of the pressure gauge shall not be less than _____ times the pressure at which the pressure relief valve is set.
A) 1.5
B) 3.5
C) 3
D) 2.5
E) 2
A) 1.5
The combined pressure temperature relief on a domestic hot water boiler prevents:
A) Energy waste
B) Reverse flow
C) The water from being too hot to cause injury
D) Heated water from becoming steam at atmospheric pressure
C) The water from being too hot to cause injury
Water expansion generated by heating in a boiler system:
A) Lifts the safety valves on the boiler
B) Is removed by reverse osmosis
C) Goes out the overflow
D) Compresses the air cushion in the expansion tank
E) Is absorbed by the flexing of the boiler shell
D) Compresses the air cushion in the expansion tank
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 high
B) has too much water
C) Is over pressured
D) Temperature is too low
E) Is not full of water
E) Is not full of water
A pressure or altitude gauge for a hot water boiler:
A) Shall have a dial scale at least 3 times the MAWP
B) Must be equipped with a siphon
C) Must be of 51mm pipe size
D) Must have a temperature dial
E) Does not require a syphon
E) Does not require a syphon
Before the try lever test on a water system operating above 60C is attempted, the operator must ensure that:
A) There is no load on the boiler
B) The boiler is in operation
C) The pressure is at least 75% of the valve set pressure
D) The boiler inspector has requested it
E) The boiler is at maximum pressure
C) The pressure is at least 75% of the valve set pressure
Loss of air in the expansion tank is likely caused by an air leak on the:
A) Drain plug
B) Inlet fittings
C) Boiler safety valves
D) Gauge glass fittings
E) Heating valve fittings
D) Gauge glass fittings
A combined temperature pressure relief is used on a:
A) Hot water heating boiler
B) Domestic hot water boiler
C) Steam heating boiler
D) High pressure boiler
E) High temperature hot water boiler
B) Domestic hot water boiler
Hot water boilers have stop valves in their inlet and outlet piping:
A) To allow for better warm-ups
B) To permit annual maintenance
C) To prevent water from entering another in service unit
D) So that each boiler can have separate water treatment
E) So that the boiler can be drained without draining the system
E) So that the boiler can be drained without draining the system
The combined pressure and temperature relief device must be installed:
A) Within the top 12inches of the domestic hot water boiler
B) At the center of the domestic hot water boiler
C) At the rear of the domestic hot water boiler
D) Within the top 6 inches of the domestic hot water boiler
E) Near the bottom of the domestic hot water boiler
D) Within the top 6 inches of the domestic hot water boiler
A combined pressure temperature relief valve:
A) Operates at 150C
B) Operates at 99C
C) Uses a spring thermostat
D) Operates at 210C
E) Operates at 75C
B) Operates at 99C
In a closed expansion tank system an air separator:
A) Is not required
B) Removes air from the system
C) Is installed at the boiler inlet
D) Directs air into the expansion tank
E) Is installed at the boiler outlet
D) Directs air into the expansion tank
Liquid water:
A) Transmits pressure unevenly
B) Increases in volume when heated
C) Decreases in volume when heated
D) Expands substantially under vacuum
E) Decreases substantially in volume when under pressure
B) Increases in volume when heated
Safety valves lifting on the boiler during operation may be cause by:
A) Insufficient make up supply pressure
B) Air in the system
C) Excess air in the expansion tank
D) Insufficient air in the expansion tank
E) Lack of boiler water treatment
D) Insufficient air in the expansion tank
The correct amount of air in an expansion tank is indicated by a water level in the bottom of the gauge glass of:
A) 1/2 of the gauge glass
B) 7/8 of the gauge glass
C) 1/4 of the gauge glass
D) 2/3 of the gauge glass
A) 1/2 of the gauge glass
The temperature indicator of a hot water boiler should indicate water temperature:
A) Midway through the system
B) In the expansion tank
C) At the boiler outlet
D) At the boiler inlet
E) In the boiler
C) At the boiler outlet
When changing a gauge glass on an expansion tank:
A) Repair and reuse the broken gauge glass
B) Tighten the packing nuts as hard as possible
C) Check the old glass for nicks and scratches
D) These gauge glasses cannot be replaced and a new tank is required
E) Check the new glass for scratches and nicks
E) Check the new glass for scratches and nicks
An auto fill valve used to keep the system filled with water will maintain a typical pressure of:
A) 15-18psi
B) 60psi
C) 15-18kPa
D) 20 kPa
E) 30psi
A) 15-18psi
