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75 Cards in this Set
- Front
- Back
As water is heated in a boiler, the water molecules ________ |
Speed up |
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As water molecules change to steam, they ______ |
Expand approximately 1500-1700 times |
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_______Is generated in the water, flows up through the water, and disengages at the waterline |
Steam |
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When water is heated beyond the boiling point, the water molecules ______ |
Change from a liquid to a gas |
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Internal water flow within a Weil-McLain boiler is through the _______, providing for better thermal circulation and heat transfer |
Lower ports and lower portion of the upper ports |
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A "Wet nipple" boiler refers to the fact that water can flow _____ |
Through the upper and lower port openings |
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As steam is generated and released from the water, it collects in the ________ |
Steam chest |
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The generation and release of steam in a boiler created a very ______ boiler waterline |
Turbulent |
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A radiator air vent ______ when the steam contacts its heat actuated float valve |
Closes |
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Steam ______ its heat energy as it changes to condensate |
releases |
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When steam cools in the radiator, it ______ |
changes from a gas to a liquid. |
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As the steam cools and turns to condensate, it returns to the boiler through the ______ |
Return piping system |
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Visual aid of steam boilers and their parts |
Only one f*cking side |
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The ___ controls the cycling of a steam boiler. |
Pressure control |
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The pressure control is piped into the boiler through _____ |
the pigtail system |
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A pressure control with an additive differential has the following two settings. |
Low and differential |
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If on a subtractive boiler pressure control, you set the differential at 1.5 PSI and the high setting at 2.0 PSI what would be the low (or burner on) setting? |
0.5 PSI 2-1.5 = 0.5 |
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The ____ acts just like a trap in a plumbing application and protects the pressure control from coming into direct contact with the steam. |
Pigtail Syphon |
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The ____ gives readings of the pressure within the boiler |
pressure gauge |
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The ____ is provided for visual inspection of the boilers operating water level. |
water-column gauge glass AKA the sight glass |
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On or near the top of the boiler you will find a _____, used to protect the boiler from excessive pressure |
Pressure relief valve |
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For residential cast iron steam boilers, the steam pressure relief valve is set to discharge at a maximum of ____ psi |
15 |
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The safety device that automatically shuts the boiler-burners off when the boiler water level drops below the water level control setting, is called a ______ ? |
low-water cutoff |
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All ____ boilers are required by code to have a low-water cutoff |
Steam |
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The ____ type low-water cutoff requires frequent "blow-down" (or flushing) to rid its sediment that can collect in its chamber |
float |
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The piping directly around the boiler is known as near boiler piping and should ______ be replaced when installing a replacement steam boiler. |
Always |
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The supply piping risers coming out of the boiler should be ______ |
sized per manufacturers instructions |
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All supply tappings coming out of the boiler are found ______ |
on or near the top of the boiler. |
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When piping multiple risers from a boiler into a common header, swing joints are used to _____ |
accommodate the expansion and contraction of the piping and the boiler |
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In sizing the header, the pipe must be sized _____ |
Specifically per manufacturers instructions |
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When installing the boilers header, you must allow a minimum of ____ between the boiler waterline and the header centerline. |
24 inches |
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Always ____ the vertical drop into the equalizer pipe |
reduce the header after |
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The ______ allows condensate to return immediately to the boiler and keeps the water from being pushed back through the return piping as the steam pressure increases. |
Equalizer line |
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When installing a Hartford Loop on a residential steam boiler, the short nipple should be installed in the Tee in the equalizer line..... And for commercial? |
2 inches below the waterline for rezzy 4 inches below the waterline for commercial |
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In piping multiple system take-off risers, it is recommended that they are piped out of the header ____ |
between the equalizer and the closest boiler riser to the equalizer |
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Installing a bullhead tee in the piping is an excellent way of eliminating water hammer. True or false. |
It is by far the absolute most retarded way to eliminate water hammer... It only causes it. Therefore the answer is FALSE |
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Check valves are _____ an acceptable replacement to Hartford Loop piping |
Never an acceptable method |
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The cold water fill pipe should be connected _____ (There are 3 blanks) |
1) Below the waterline 2) Into the condensate return piping 3) As far from the boiler as possible. |
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For a basic one-pipe steam system, the proper pitch for the system main should be a minimum of ____, from where the main begins to where it drops into the wet return. |
1 inch per 20 feet |
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The _____ rapidly expels air out of the system main |
Quick vent |
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The proper placement of a quick vent is ____ |
15 inches from the end of the main |
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The length of the radiator riser, from the main to the radiator should be at least _____ |
3 feet |
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The radiator riser is connected to the radiator through _____ which is fully opened to control the flow of steam into the radiator. |
a supply valve |
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The radiator air vent _____ when steam enters it, thus keeping the steam in the radiator. |
closes |
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_____ air vents allow you to adjust the speed at which the air escapes from the radiator. |
Adjustable |
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Balancing the system means that _____ |
by using adjustable air vents you can control the speed of steam arriving at individual radiators. |
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The system main can carry both steam and condensate in the same direction at the same time. True or false. |
True. |
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The _____ is that portion of the return main located above the boiler water level. |
Dry return. |
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The _____ is always completely filled with water. |
Wet return. |
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"Dimension A" refers to _____ (There are three blanks) |
1) The pressure drop of the system. 2) The static head of the system. 3) A safety factor in the system. |
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For a steam system under 100,000 BTUs there should be a minimum dimension of _____ from the vertical drop of the dry return to the boiler waterline. And what is it for over 100,000 BTUs |
18 Inches for under 100M BTU 28 inches for over 100M BTU |
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Steam and condensate flow in the same direction in _____ steam piping systems |
One-pipe parallel flow |
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In _____ steam piping systems the condensate and steam flow in opposite directions |
One-pipe counter flow |
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A one pipe counter-flow steam piping system requires the system main to be pitched _____ |
1 inch per 10 feet |
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A _____ steam piping system carries steam and condensate in separate pipes |
Two-way |
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The _____ located at the end of the radiator in a two-pipe steam system discharges air and condensate from the radiator. |
Thermostatic trap |
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Two-pipe steam systems use _____ on the radiators rather than air vents. |
Traps |
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A _____ allows both air and condensate to be quickly discharged directly out of the system main. |
Float and thermostatic trap |
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Newer steam boilers are designed to steam at full capacity _____ before the low-water cutoff shuts off the boiler. |
For ten to fifteen minutes. |
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If a water feeder is used to increase steaming time, it may cause _____ of the boiler. |
Flooding |
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The _____ can be used to provide additional water fro the boiler to help increase steaming time. |
Reservoir pipe |
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If the condensate is too slow in returning to the boiler causing the low-water cutoff to cycle off too quickly, this may indicate that _____ |
There is an obstruction in the piping system. |
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All steam piping systems include at least a _____ (3 blanks) |
1) System riser and system main 2) Radiator riser with swing joints 3) Condensate return piping system. |
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Every _____ steam boiler should be skimmed. (3 blanks) |
1) New 2) Existing 3) Replacement |
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If a steam boiler is not cleaned, _____ may occur. (3 blanks) |
1) Loss of efficiency 2) Erratic operation 3)Surging |
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Oil, grease, or other foreign matter floating on the boiler water surface _____ the proper operation and steaming of the boiler. |
Can severely affect |
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When skimming the boiler, you should raise the water to _____ of the skim tapping |
The center |
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One good method that you can use to observe the water level when skimming a boiler is to _____ |
Install a tee in the skim piping. |
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During the skimming process the boiler water temperature should be _____ |
Just below steaming |
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A typical skimming of a steam boiler may take _____ to complete |
Several hours |
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After skimming, the boiler should be filled with fresh water and steamed for _____ to eliminate dissolved gases from the make-up water. |
15 minutes |
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Boiler chemicals should _____ in a steam boiler. |
Only be used if necessary |
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If skimming doesn't clean the boiler, it is acceptable to use _____ , soaking for 20-30 minutes in the boiler until its water has a pH of 7.0 to 8.5 (3 blanks) |
1) Trisodium phosphate 2) Sodium hydroxide 3) Sodium carbonate |
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When using one of the recommended boiler chemical cleaners, it is a good practice to steam the boiler so that the chemicals will clean the whole piping system. True or false? |
False. |
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Many steam boiler service calls can be solved by simple _____ the boiler. |
Skimming and flushing. |