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How to determine Boiler HP on conventional boilers?
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MN Boilers Exam
| Question | Answer |
|---|---|
| How to determine Boiler HP on conventional boilers? | 1 Boiler HP=10sqft of heating surface |
| A.S.M.E. ? | American Society of Mechanical Engineers |
| 1 Boiler HP on Coil Type Boilers? | 5sqft of heating surface |
| 1 Boiler HP on Conventional Boilers? | 10sqft of heating surface |
| 1 Boiler HP on electric type Boilers? | 10KW |
| What is Latent Heat? | “Hidden Heat” Heat required to change a state but not the temp. |
| What is sensible Heat? | Heat that we can see and measure. |
| What is a shift operator? | In charge of boiler during your shift. |
| Time you must put in on a low pressure boiler in order to qualify for your next license? | 12 calendar months, must include one heating season. |
| Time you must put in on a high pressure boiler in order to qualify for your next license? | 2000 hours |
| Minimum information in your log book? | Who checked the boiler, what did you check and when did you check it. |
| Who can sign an affidavit? | Anyone with a license above a special engineer. **Best answer is Chief Engineer** |
| How to determine the maximum working pressure of your boiler? | It is located on the safety valve. |
| Is it acceptable to make a photocopy of your license? | Yes, and it is required if you are in charge of multiple Boilers. |
| Heating surface on a boiler is? | An area that has heat on one side and water on the other. |
| What is a boiler? | *container *transfers heat *holds water *collects steam |
| HRT? | Horizontal Return Tubular |
| Purpose of tubes? | Increase the heating surface and stabilize the tube sheets. |
| The three types of Boilers? | *Water Tube *Fire Tube *Cast Iron Sectional |
| What is a push nipple? | Short piece of pipe that is tapered on both ends. |
| What is the maximum steam pressure on a cast iron boiler? | 15psi |
| What is a staybolt? | It is a brace that protects the inside of the boiler from imploding. |
| Which seam on a boiler is susceptible to the most stress? | Longitudinal seam |
| What is an economizer? | It is used to pre-heat the water after the boiler exit. |
| What is a pre-heater? | It pre-heats the combustion air after the boiler exit. |
| Which tubes are easier to change on a boiler? | Fire tube |
| Which tube is the most dangerous in the case of an explosion? | Fire tube because of the water volume. |
| What is the first thing you check on a low pressure boiler? | Water level |
| What is the first thing you check on a hot water boiler? | Temperature and pressure |
| What is a water column? | A dampening device |
| What is the minimum pipe side for connecting to the water column? | 1 in. |
| What do you use to monitor water levels if you have a broken sight glass? | Tri-cox or gauge cox but you must have constant supervision. |
| What two valves are required on a freshwater line? | Stop valve and check valve? |
| What is a check valve? | An automatic valve that allows flow in one direction. |
| Where is the stop valve located? | Closest to the boiler. |
| What type of action is he glove valve used for? | Throttling action |
| What is referred as the difference in pressure when a safety valve opens or closes? | Blowback |
| Why is a safety valve sealed? | So it cannot be tampered with out in the field. |
| How often do you check the safety valve on a low pressure system? | 90 days |
| How often do you check the safety valve on a high pressure system? | Annually or yearly |
| What is the minimum sized safety valve for a low pressure system? | 4 1/2 in. |
| What is the minimum pipe size for attaching a pressure gauge? | 1/4 in. |
| What is the maximum temperature of a Bordon Tube? | 150 degrees |
| The gauge must be able to read _____ times the pressure, preferably _____ times the pressure of the boiler? | 1 1/2 to 2 times |
| What is a pigtail for? | It controls the temperature to protect the Bordon Tube from the high temperature of the steam. |
| What is an Aquastat? | It is a temperature sensing device. |
| What two scales does a Pressure troll have? | Cut-in and differential |
| What is the maximum pipe size for the bottom blowdown line? | 2 in. |
| How do we open/close the blowdown valve? | We do it slowly. |
| How many valves are required on a blowdown line for Boilers over 100hp and 100psi? | 2 valves |
| What is the maximum temperature for water entering the sanitary sewer line? | 150 degrees |
| What are the reasons we use the bottom blowdown? | *control sediment *control high water *control chemical situation *drain boiler |
| What is the bottom blowdown in a hot water boiler called? | Drain Valve |
| How often should we blowdown? | As much as needed. |
| What is a slow opening valve? | A valve that requires 5 turns. |
| What is required in a boiler room? | Log book and Boilers license |
| When is a Boilers most likely to explode? | During light off |
| When is a boiler least likely to explode? | During heavy load. |
| What devices are contained in the windbox? | Sailswitch and damper or pressure switch and damper. |
| What is purging? | Removing fuel from the combustion chamber. (4-5 air exchanges per purge cycle.) |
| What is the pilot phase? | When the fuel valve opens and we can ignite the fuel. |
| What are the three T’s of combustion? | *Time *Temperature *Turbulence |
| What is a chemical reaction that results in heat? | Combustion |
| What 3 things are needed to sustain combustion? | *Heat *Fuel *Oxygen |
| What device controls the starting and stopping of the burner on a hot water boiler? | Aquastat |
| What device controls the starting and stopping of the burner on a low pressure boiler? | Pressure troll |
| What chemical is used to remove oxygen? | Sodium Sulfite |
| What is used as a mechanical means of removing oxygen from the feed water? | De-erating tank |
| What is draft? | The difference in pressure between two points. |
| What is the device that is used to measure draft? | Manometer |
| What are the three different types of draft? | *Natural *Forced *Induced |
| Where is the induced draft fan located? | After the boiler exit. This fan needs to be larger than the forced fan. |
| Where is the forced draft fan located? | On the front of the boiler. |
| What is it called when you have all the drafts together? | Balanced Draft |
| What is the air called that is over and above what is required for the combustion process? | Excess Air |
| Types of flu gas analyzers are? | Fyrite and Orsat |
| Two safety valves with a vent in the middle? | Double Block and Bleed |
| What is the danger of running a gas burner at low flame? | The possibility of extinguishing the fire. |
| What are the three types of fuel oil used? | *#1 *#2 *#5 *#6 |
| Which fuel oils are referred to as light oil? | #1 and #2 |
| Which fuel oils are referred to as heavy oil? | #5 and #6 |
| What temperature is required to ignite heavy fuel oil? | It needs to be brought to the ignition temperature. |
| What is it the lowest point oil will flow readily as a liquid called? | Pour Point |
| What is the BTU content of #1 fuel oil? | 140,000 BTU per gallon |
| What is the BTU content of #2 fuel oil? | 142,000 BTU per gallon |
| What is the BTU content of #5 fuel oil? | 150,000 BTU per gallon |
| What is the BTU content of #6 fuel oil? | 152,000 BTU per gallon |
| What is a Ringlemann Chart? | It is a smoke opacity chart. |
| What are the three different pumps in our system? | *Reciprocating Pump *Rotary Pump *Centrifugal Pump |
| How do you determine the rotation of a centrifugal pump? | Which way the veins are facing. |
| What happens to the boiling point in a vacuum? | It will decrease. |
| What are the three different ways to atomize fuel oil? | *Direct Pressure *High Power Steam/High Power Compressed Air *Rotary Cup |
| What will cause a buildup on the back wall? | Plugged fuel oil nozzle. |
| What is it called when you relive the pressure in the head of an air compressor? | Unloading the heads. |
| What clothing is required in the boiler room? | Whatever PPE (Personal Protective Equipment) you plant requires. |
| Can low water occur in a hot water heating type boiler? | Yes, for any number of reasons. |
| In addition to a Safety Relief Valve what other safety device should be installed on a hot water boiler? | Low water fuel cutoff. |
| What removes air from a Hot Water boiler system | Air Control |
| If the circulating pump fails what valve can manually be opened to provide hot water to the heating units through natural circulation? | Flow Control Valve |
| Oxygen in the boiler water can lead to? | Corrosion and pitting of the boiler metal. |
| When a hydrostatic test of a boiler exceeds the maximum allowable working pressure each safety valve (if left attached to the boiler) should? | Have its valve disc held to its seat by means of a testing clamp or gag. |
| What is the gauge pressure plus 14.7 called? | Absolute pressure |
| What is it called when a safety valve opens and closes rapidly? | Chattering |
| When a steam boiler system is blowing into the condensate tank or vacuum pump, what could the problem be? | Steam Trap Malfunction |
| What is the unit that shuts the burner off in case of low water? | Low-Water Fuel Cutoff |
| Water treatment chemicals are used in low pressure boilers for? | *Preventing Scale *Reducing Oxygen |
| In a steam boiler system what is the term used for replacing the water that has been lost by blowing down the boiler or through leaks in the system? | Makeup |
| In order for fuel to burn it must be heated to? | Its ignition temperature |
| On a steam boiler system why are the bottom blow down valves installed at the lowest point of the water side of the boiler? | To remove sludge and sediment. |
| What should be done if the water is not visible in the gauge glass because of failure of the feed water supply? | Shut off the fuel to the burner and secure the boiler. |
| What is the minimum size safety valve that must be installed on a miniature boiler (less than 5 cubic feet)? | 1/2 in. |
| What is the minimum sized drain required on a water column? | 3/4 in. |
| What is air that is mixed with the fuel at or in the burner? | Primary Air |
| The evaporation of 34 1/2 poinds of water per hour from and at a temperature of 212 degrees F is defined as? | 1 boiler HP |
| The low water fuel cut-off should be tested? | At least once daily. |
| What is the transfer of heat from one part of material to another or to a material from which it is in contact with? | Conduction |
| Boilers are considered low pressure when? | Steam boilers are not over 15 psi and liquid boilers are not over 160 psi and or 250 degrees F. |
| Boiler and boiler fittings used in the state of Minnesota must be constructed to what code? | ASME |
| The first sequence in the series of automatic boiler control is? | Purge |
| If a steam trap on a radiator of a steam heating system becomes water logged, what will happen? | The radiator will not heat the room properly. |
| How often should a low water cut-off be opened and inspected internally? | Annualy |
| If you cannot determine the water level what must you do? | Reduce load to low fire until level is determined. |
| Who is responsible for boiler inspection? | Owner or properly licensed engineer. |
| What is the purpose of an expansion tank? | Allows for expansion and contraction as the water volume varies. |
| State of Minnesota requires that boilers be inspected how often? | Annually/Yearly |
| What is the purpose of bottom blowdown besides removing sludge? | Drain the boiler |
| Steam boilers under 200 HP must have the low water cut off tested how often? | Daily |
| Comparing a Hot Water Boiler to a Steam Boiler, what does a Hot Water Boiler have that a Steam Boiler does not? | *Circulating Pump *Expansion Tank *Aqua Stat |
| According to national board code safety valves are to be tested how often? | 90 days |
| What must be done after a Hot Water Boiler has been drained, cleaned, and refilled? | Remove the air |
| When in operation a high pressure boiler of 25 HP, must be checked how often? | 24hrs |
| All stationary boilers of what pressure must have 2 valves on the blow off line? | 100 psi |
| How is Boiler efficiency calculated? | Output divided by Input |
| A high pressure boiler is classified as such when? | above 15psi steam and 160 psi water pressure |
Created by:
cbavier