Book 1 Chapter 5: Basic Fittings For Steam Boilers Flashcards
The type of gauge that is commonly used to indicate steam pressure inside a boiler is the _______ gauge:
A) gauge glass
B) bourdon tube
C) safety
D) directly attached
B) bourdon tube
To protect the pressure gauge from the high temperature of the steam a _______ is installed between the steam and the gauge
A) check valve
B) stop valve
C) vacuum tube
D) pipe syphon
D) pipe syphon
You would test a boiler pressure gauge while in service by using a ________.
A) dead weight tester
B) hydraulic tester
C) master test gauge
D) pop test
C) master test gauge
The ________ valve protects the boiler when the pressure approaches its maximum allowable working pressure
A) vent
B) safety
C) check
D) blowoff
B) safety
The lowest visible part of the water gauge glass will be above the ________ recommended by the manufacturer
A) lowest permissible manufacturer
B) fire line
C) top of the firetubes
D) middle try cock
A) lowest permissible manufacturer
An advantage of using a water column is that it:
A) allows air to escape when filling the boiler
B) will indicate the boiler pressure
C) makes the water level easier to read
D) prevents water and steam from escaping if the gauge glass breaks
C) makes the water level easier to read
The blowoff connection on a boiler is made:
A) at the lowest permissible water lead
B) just below the safety valve connection
C) at the lowest point of the boiler
D) just below the feedwater inlet
C) at the lowest point of the boiler
The purpose of the pipe siphon installed between the boiler and the pressure gauge is to prevent:
A) Air from entering the boiler
B) Air from entering the gauge
C) Host steam from entering the boiler
D) Water from entering the gauge
E) Hot steam from entering the gauge
E) Hot steam from entering the gauge
LP steam boilers must be equipped with a marker indicating the:
A) Fireline
B) Maximum water level line
C) Lowest visible water line
D) Low water fuel cut-off line
E) Lowest permissible water line
E) Lowest permissible water line
If a gauge glass breaks, the operator shall immediately:
A) Add more water to the boiler
B) Lift the safety valve
C) Shut the boiler down
D) Shut the fuel valve
E) Shut off the steam valve and water valve on the gauge
E) Shut off the steam valve and water valve on the gauge
The try lever test should be done and recorded in the log book:
A) Annually
B) Weekly
C) At the beginning of every shift
D) Monthly
E) Daily
D) Monthly
A disadvantage of a gauge glass safety-shutoff valve is it:
A) Requires more maintenance
B) Makes gauge glass replacement more difficult
C) Cannot prevent water loss
D) Cannot be blown down
E) Cannot withstand high pressure
A) Requires more maintenance
What is the first step in replacing a broken gauge glass tube after securing proper PPE?
A) Isolate the boiler
B) Lower boiler level below the glass
C) Close the gauge glass isolators and open drain
D) Shut off the feedwater
E) Open the water column drain valve
C) Close the gauge glass isolators and open drain
The “try lever test” is performed by:
A) Bypassing the high pressure limit control
B) All of the above
C) Manually lifting the safety valve off of its seat
D) Raising boiler pressure to MAWP
E) Shutting the boiler stop valve
C) Manually lifting the safety valve off of its seat
Boiler outlet valves are usually:
A) Globe valves because of their throttling capability
B) Globe valves because of their low flow resistance
C) Installed in tandem
D) Gate valves because of the ability to control flow
E) Gate valves because of their low resistance to flow
E) Gate valves because of their low resistance to flow
On LP boilers, the try lever test should not be attempted unless the boiler:
A) Is at MAWP(maximum allowable working pressure)
B) Is at lease 75% of MAWP
C) The boiler has been blown down
D) Pressure is at least 34 kPa (5psi)
E) Is up to temperature
D) Pressure is at least 34 kPa (5psi)
When testing the boiler pressure gauges using a Test Gauge:
A) The boiler must be out of service
B) Can be done while the boiler is in service
C) Any error is compensated for mathematically
D) The gauge should be equipped with a check valve
E) A single test gauge can be used for all different pressures
B) Can be done while the boiler is in service
Gauge glass rupture my be caused by:
A) A cold draft
B) Maximum allowable boiler pressure
C) Improper boiler water treatment
D) A sudden pressure drop
E) Warming the boiler up too quickly
A) A cold draft
The force of the steam pressure acting on the safety valve disc is a function of:
A) Seat diameter
B) Percent valve opening
C) Blowdown ring diameter
D) Huddling chamber volume
E) Disc area
E) Disc area
Try cocks are used to:
A) Check the level of water in the boiler
B) Check the temperature of the water in the column
C) Check the pressure of the water in the column
D) Blown down the water column
E) Isolate the gauge glass quickly
A) Check the level of water in the boiler
When replacing a gauge glass that uses “O” rings, tighten the packing nuts:
1. Under pressure
2. With a wrench
3. One after another
4. Alternately
A) 1&4
B) 2&3
C) 1&3
D) 2&4
E) 3&4
D) 2&4
Some steps involved in performing the “pop” test are:
A) Close the discharge valve
B)Record the pressure at which the valve lifts off of its seat
C) Bypass the high pressure limit switch
D) Close the feedwater inlet
E) All of the above
E) All of the above
A function of a Bourdon tube gauge hairspring is to:
A) Keep the pointer at zero
B) Return the pointer to zero
C) Eliminate pointer linearity
D) Eliminate backlash
E) Return the tube to its zero position
D) Eliminate backlash
When replacing a gauge glass tube after the glass has been isolated and cooled:
A) Install the glass
B) Remove the packing and broken glass
C) Loosen the packing nuts
D) Slowly warm the glass
E) Remove the guard
E) Remove the guard
The blowdown ring on a safety valve is used to adjust:
A) The amount of time that the relief valve is open
B) The difference between the pressure at which the valve opens and the pressure at which the valve closes
C) The maximum pressure to open the relief valve
D) The amount of continuous blowdown as required to control boiler water contaminants
E) The difference between the temperature at which the valve opens and the temperature at which the valve closes
B) The difference between the pressure at which the valve opens and the pressure at which the valve closes
When the main steam stop valves of heating boilers are over 51mm (2in) it is recommended that _______ be used.
A) Globe valves
B) Solenoid operated valves
C) Diaphragm operated valves
D) Gate valves
E) OS & Y valves with rising spindles
E) OS & Y valves with rising spindles
A heating boiler must have a permanently attached marker indicating:
A) The maximum allowable working temperature
B) Highest permissible water level
C) Lowest permissible water level
D) Lowest permissible steam level
E) The maximum allowable working pressure
C) Lowest permissible water level
A check valve is used in the feedwater line to prevent:
A) A reverse flow of water from the boiler
B) Water hammer in the feedwater line
C) A reverse flow of steam from the boiler
D) A reverse flow of water from the feedwater line
E) Air from entering the feedwater line
A) A reverse flow of water from the boiler
Boiler fittings are:
A) Devices directly attached to any part of a boiler
B) Devices used for the safe operation of boiler plants
C) Devices directly attached to the pressure part of a boiler
D) All pipe fittings used with boiler operation
E) Valves and instruments in the boiler plant
C) Devices directly attached to the pressure part of a boiler
Boiler gauge glass packing nuts may be tightened:
A) Once the glass has cooled to room temperature
B) Once the pressure has been removed
C) With a torque wrench
D) Only hand tight
E) At any time
B) Once pressure has been removed
The blowdown tank is/does:
A) Not cool the water
B) Does not empty into the sewer
C) Is not required on a low pressure boiler
D) Does not allow the pressure to be reduced
C) Is not required on low pressure boiler
A Bourdon tube is in the shape of:
A) A diaphragm
B) A bellows
C) The letter “C”
D) An oval in the cross section
E) The letter “C” and oval in cross section
E) The letter “C” and oval in cross section
The boiler vent valve is used for the purpose of allowing:
A) Air to escape while draining
B) Steam to enter while filling
C) Steam to enter while draining
D) Air to escape while filling
E) Water to escape while filling
D) Air to escape while filling
The safety valve pop test can be carried out by:
A) Popping the valve with a hammer
B) Reducing the pressure on the spring
C) Slowly raising the boiler pressure
D) Lowering the try level
E) Lifting the try lever
C) Slowly raising the boiler pressure
Gauge glass safety shutoff valves are equipped with a:
A) Self closing stem
B) Brass plug
C) Floating disc
D) Flopper disc
E) Stainless steel ball
E) Stainless steel ball
