Basic fitting for steam boilers Flashcards
The purpose of the pipe siphon installed between the boiler and the pressure gauge is to prevent:
A) Air from entering the gauge B) Water from entering the gauge C) Air from entering the boiler D) Hot steam from entering the gauge E) Hot steam from entering the boiler
D) Hot steam from entering the gauge
LP steam boilers must be equipped with a marker indicating the:
A) Maximum water level line B) Lowest permissible water line C) Lowest visible water line D) Low water fuel cut-off line E) Fireline
B) Lowest permissible water line
If a gauge glass breaks, the operator shall immediately:
A) Add more water to the boiler B) Shut the boiler down C) Lift the safety valve D) Shut off the steam valve and water valve on the gauge E) Shut the fuel valve
D) 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) Monthly B) Daily C) At the beginning of each shift D) Weekly E) Annually
A) Monthly
A disadvantage of a gauge glass safety-shutoff valve is it:
A) Cannot be blown down
B) Requires more maintenance
C) Cannot withstand high pressure
D) Makes gauge glass replacement more difficult
E) Cannot prevent water loss
B) Requires more maintenance
What is the first step in replacing a broken gauge glass tube after securing proper PPE?
A) Close the gauge glass isolators and open drain B) Lower boiler level below the glass C) Isolate the boiler D) Open the water column drain valve E) Shut off the feedwater
A) Close the gauge glass isolators and open drain
The “try lever test” is performed by:
A) Bypassing the high pressure limit control
B) Raising boiler pressure to MAWP
C) Shutting the boiler stop valve
D) Manually lifting the safety valve off of its seat
E) All of the above
D) Manually lifting the safety valve off of its seat
Boiler outlet valves are usually:
A) Gate valves because of their low resistance to flow
B) Globe valves because of their low flow resistance
C) Installed in tandem
D) Globe valves because of their throttling capability
E) Gate valves because of the ability to control flow
A) 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 up to temperature C) Is at least 75% of MAWP D) The boiler has been blown down E) Pressure is at least 34 kPa (5 psi)
E) Pressure is at least 34 kPa (5 psi)
When testing the boiler pressure gauges using a Test Gauge:
A) Any error is compensated for mathematically
B) The boiler must be out of service
C) A single test gauge can be used for all different pressures
D) The gauge should be equipped with a check valve
E) Can be done while the boiler is in service
E) Can be done while the boiler is in service
Gauge glass rupture may be caused by:
A) A cold draft B) Maximum allowable boiler pressure C) Warming the boiler up too quickly D) Improper boiler water treatment E) A sudden pressure drop
A) A cold draft
The force of the steam pressure acting on the safety valve disc is a function of:
A) Blowdown ring diameter B) Seat diameter C) Huddling chamber volume D) Percent valve opening E) Disc area
E) Disc area
Try cocks are used to:
A) Check the level of water in the boiler
B) Isolate the gauge glass quickly
C) Check the pressure of the water in the column
D) Blow down the water column
E) Check the temperature of the water in the column
A) Check the level of water in the boiler
When replacing a gauge glass that uses “O” rings, tighten the packing nuts:
- Under pressure
- With a wrench
- One after another
- Alternately
A) 3 & 4 B) 2 & 3 C) 1 & 4 D) 2 & 4 E) 1 & 3
D) 2 & 4
Some steps involved in performing the “pop” test are:
A) Record the pressure at which the valve lifts off of its seat B) Bypass the high pressure limit switch C) Close the discharge valve D) Close the feedwater inlet E) All of the above
E) All of the above
