Steam Flashcards
T or F
Safety boiler water feeder combinations are designed to maintain a normal water line in the boiler?
T
Draw a steam station
Label the components.
We will also have to do a material takeoff for items needed.
T or F
A steam pop safety valve is adequate protection on a low pressure boiler to prevent damage?
F
You have fusible plugs, lwco, lwco feed water pump combos as well as a Hartford loop in COMBINATION with a steam pop safety valve.
T or F
Steam main should be pitched up in the direction of of flow.
F
T or F
Return mains should be pitched up in the direction of flow.
F
Mechanical traps operate on the _______________ between the steam and the condensate.
Difference in Density
Reduces the pipe size in a horizontal steam main requires the use of ___________ reducer.
Eccentric
The lowest safe water line in a boiler should not be lower than the ______________ of the gauge glass.
Lowest visible part
A conventional float-operated low water fuel cutoff will turn off the _________ but will not mechanically feed water to the boiler.
DA BURNA!!
< the burner>
Explain what happens to a boiler when the water line drops below the minimum safe level.
It enters a low water condition which could lead to catastrophic failure.
Name three main parts of a heating system.
Heating source (boiler)
Distribution System (pipe)
Terminal Units
Explain the difference between an air vent and an air vacuum valve.
Thermostatic vent heats up and opens up letting non condensables out.
Vacuum air vent allows a partial vacuum . Thermostatic does not.
Name three methods of returning condensate to the boiler.
Gravity
Pressure
Mechanical
Define a package boiler.
A packaged boiler is one furnished by the manufacturer that includes all of the necessary accessories for operation.
List the four functions of boiler connections.
Safety ( pop safety valve)
Controls ( combination low water cutoff)
Pressure Sensing ( gauge)
Temperature Sensing ( thermometer)
What causes the bucket of an inverted bucket trap to rise closing the valve at the top of the trap?
When steam reaches the trap, it collects at the top of the bucket, imparting buoyancy. The bucket then rises and lifts the valve towards its seat.
In a mechanical condensate return steam heating system, what flows in the dry return?
Air, steam, or condensate flows in the dry return.
A combination feeder low water cut-off will function regardless of a source of what?
Make up water, the lwco feed water combo will shut off the burner no matter if the correct amount of water is made up via the feed water device or not.
In a mechanical condensate return steam heating system, by what means is the condensate returned to the boiler?
A condensate receiver with a condensate pump.
What is the purpose of the water gauge on the boiler?
The water gauge let’s the operator see the level of water in the boiler via a sight glass.
Name three sources of heat loss that must be considered when determining the initial steam pressure in a system.
Air elimination
Draining of fluids
Pressure differential.
I still need to verify this answer with Worth.
Where is the proper location for the steam gauge to be connected?
Directly to the boiler at its highest point of the steam vessel.
Explain the function of a steam trap.
A steam trap permits air and any non-condesables to flow out of the heating units or steam piping into the condensate return piping without allowing live steam to escape.
Why is it important for the pipefitter to understand the correct procedures in the installation of boiler accessories.
So the boiler can run safely and efficiently.
Why does an angle pattern trap make the connector easier to install?
It allows more working space connections.
What is the purpose of connecting the blow down piping to a blow down tank or other apparatus before going to the sanitary sewer?
To allow the water to cool down to a safe temperature before it is exposed to atmosphere.
What Is the purpose of the Hartford loop?
Creates and inverted seal providing positive protection against emptying of the boiler due to the failure of return boiler piping.
In what three ways are steam systems classified?
Vacuum system
Low-Pressure System
High-Pressure system
In a mechanical condensate return steam heating system, what flows in the riser?
Mainly condensate and steam. Air may also be present.
Water hammer is caused from?
Steam coming into contact with pockets of condensate that might have collected due to incorrect installation of piping. Pitch, valves, strainers, reducers etc.
In a mechanical condensate return heating steam heating system, what flows in the supply loop?
Steam is what is supplied to the terminal units.
Explain why a pipe siphon is used with a steam gauge.
It forms a water seal that prevents raw steam from entering a gauge and damaging it.
