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Special boiler op
| Question | Answer |
|---|---|
| How many square feet of heating surface is equivalent to one boiler horsepower on a boiler? | 10sq ft of heating surface. |
| What is meant by the term low pressure boiler? | Steam or vapor pressure less than 15 psig, water or other liquid in a boiler that does not exceed 160 psig or temperature above 250F |
| A person holding a current mn special boiler engineers license can be in charge of ? | High and low pressure boilers not to exceed a total of 50 boiler horsepower . |
| A special boiler engineer can be a shift engineer in a plant of not more than? | 100 boiler horsepower. |
| A special engineer may serve as an apprentice in what size water or other liquid or steam or other vapor boiler? | In any plant regardless of size under the direct supervision of a properly licensed engineer. |
| The purpose of a low water cut off on a steam or hot water boiler is to? | Shut off the burner when a low water condition exists. |
| The valves that must relieve all excess pressure on a steam or hot water boiler are? | Safety valve / or an asme approved safety relief valve. |
| A tri indicator could be found on? | A hot water boiler. |
| A tri indicator would inform the boiler operator of? | 1. Temperatures of the water 2. Pressure of the water in psig 3.altitude of the water in feet. |
| What is the destructive force in a steam or hot water boiler explosion? | The instant release of energy stored in the water/steam as heat. |
| Tri cocks or gauge cocks are used on a steam boiler to indicate what? | The true water level inside a boiler. |
| On a steam or hot water boiler, the safety valve or safety relief valve can be tested by? | By lifting the manual lever on the valve, or raising the pressure untill it operates. |
| Before starting a steam or hot water boiler you should always check for? | Water / water level in the boiler |
| Safety valves or safety relief valves should be tested at least ? | Monthly. |
| You should test the low water cut off how often? | Weekly. |
| What device should be located between the hot water boiler and the expansion tank? | An isolation valve / shut off valve so the expansion tank may be drained / serviced during operation of the boiler. |
| Every time the burner operates on a hot water boiler the safety relief valve opens . Why? | The expansion tank could be water logged or the isolating valve for the expansion tank is closed. |
| An aquastat is used on? | A hot water boiler. |
| On a steam boiler the the control named operator (pressure control) will? | On a pressure decrease it will start, and on a pressure increase it will stop. |
| On a hot water boiler the control named operator (aquastat) will? | On a temperature decrease it will start the boiler, and on a temperature increase it will stop the boiler. |
| On a steam boiler what is a siphon or a pig tail used for on a gauge? | To protect the gauge from too high of a temperature. |
| What is one way an expansion tank could become filled with water? | Air leaking from the expansion tank. |
| What do you do if you come into a boiler room and find there is no water in the boiler regardless if it's a hot water or steam boiler? | Shut of the burner and allow it to cool , check for damage before refilling. |
| The most dangerous action an operator can take when a dangerously low water condition exists on a boiler is? | Adding water to the boiler before letting it cool . |
| What is the purpose of a bottom blow down on a steam boiler? | To remove sludge and sediment , to drain the boiler and control chemicals. |
| What is the maximum boiler horsepower you may take charge of on a chief engineers license? | Unlimited horsepower. |
| What should be displayed in the boiler room? | The engineers license , exemption or inspection certificates and a boiler log book. |
| To whom would you report a boiler condition not safe? | The boiler inspector. |
| When filling and draining a boiler you should? | Open the boiler vent/air cock. |
| Before the main gas valve will open the ? | Pilot light must be confirmed. |
| When starting or shutting down a boiler you should? | Have it on low fire. |
| If the gauge glass breaks you can ? | Run the boiler using the tri cocks. |
| Under normal conditions water in a gauge glass should move a little, if it does not you should? | Check to see if a valve is closed or plugged. |
| How often should a boiler be inspected? | Once a year. |
| Who is responsible to have the boiler inspected? | The owner and the operating engineer. |
| What type of valve is the safety valve? | Spring loaded. |
| When testing the low water cut off you should? | Have the boiler turned on and the burner firing. |
| What is the most common reason for boiler explosions? | Not venting and purging before lighting / re-lighting the burner. |
| First thing you do when entering a boiler room? | Check the boiler water level. |
| Most important valve on the boiler for safety ? | Safety valve. |
| On a hot water boiler the expansion tank is used to? | Allow for expansion and contraction of water volume as temperatures vary. |
| Found on a steam boiler (3 things)? | Pressuretrols, tri cocks , steam pressure gauge |
| A hot water boilers vent valve makes sure that? | There is water in the boiler and that any trapped are may be vented. |
| Both steam and hot water boilers have a bottom blow down valve. T or F | True. |
| High pressure valves are made of? | Cast steel, forged steel, or steel alloy. |
| High pressure boilers require 2 means of water feed? T or F | True. |
| What is the max temp of water that can be drained into a sani-sewer floor drain? | 150F |
| A bottom blow down line has two valves? T or F | True. A quick opening valve closest to the boiler shell and then a slow opening valve to slowly drain boiler. 5 turns = full open or full closed. |
| Multiple boilers with a common header must have? | A main steam stop valve with a drain between. |
| Minimum boiler safety valve size? | 1/2 inch |
| Safety valve on a low pressure hot water boiler must not exceed? | 160 psi popping pressure. |
| Stop valves over 2" in dia. Must have a? | Rising stem . |
| Steam gauge to steam boiler connection must be a minimum of? | 1/4 inch |
| Low pressure boiler safety relief valve has a maximum size of? | 4 1/2 inches |
| High pressure boilers with heating surfaces over 500 sq ft must have a minimum of 2 safety valves. T or F | True. |
| Water column connections must have a ____ at all right angle connections. | A cross tee . To clean and inspect |
| One boiler horsepower is equal to ? | 10sq feet of heating surface , or btu boiler input divided by 67,000 |
| Steam boiler has two valves on main steam line , boiler code jurisdictions end after? | The 2nd valve |
| Water column drain size must be a minimum of? | 3/4inch |
| One foot of head is equal to? | 4.34 psi |
| Stop cock on a steam gauge must be a______or lever gauge. | T . |
| Cast iron boiler maximum steam pressure = ? | 15 psig. |
| Clamp or gag safety valves must be used during ? | A hydrostatic test |
| Blowback on 100# safety valve must be? | At least 2lbs. |
| 2 safety valves must relieve enough pressure to prevent exceeding ______? | 6% above max allowed working pressure. |
| Os&y gate valve may be used between high pressure steam boiler and_______? | The water column. |
| Steel water columns to be used with pressures over_____? | 350 psi |
| What are the three types of drafts? | 1. Natural 2. Forced (pushed) 3. Induced ( pulled) |
| Globe valves are used to? | Throttle or restrict flow. |
| Low water cut offs shall be________ daily while boiler is in operation | Tested |
| Boilers with new burners or a new boiler room must have a __________ by each door leaving the boiler room. | Kill switch. |
| Two low water fuel cut offs must be used when btu input exceeds_______. | 1 million btu's .... and the 2nd low water cut off must have a manual reset |
| A boiler room log book should have? | The date , what was done and your name. |
| What is a water tube boiler? | Water is inside the tubes and the fire surrounds the tubes. |
| What is a fire tube boiler? | Fire is inside the tubes and the water surrounds the tubes. |
| What are the three types of boilers? | Water tube , fire tube , and cast iron sectional. |
| Aquastats operate by ? | Sensing temperature. |
| Heat transfers in what three ways? | Conduction , convection and radiation. |
| What does a steam trap do? | Prevents steam from leaving the system and allows dirt , air and condensate to pass . |
| Purging is part of the______cycle. | Firing. |
| Annual boiler inspection includes? | Water and fire side cleaned and inspection ports open. |
| When blowing down the water column water should ? | Refill glass gauge quickly. |
Created by:
Stephenkelley