Ohio Boiler Test Flashcards
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Questions and Answers

The pressure at the base of a vertical foot of water is:

  • 0.433 psi (correct)
  • 0.5 psi
  • 1 psi
  • 1.5 psi

    • When performing a hydrostatic test, the pressure on the boiler should be increased to:

    1 ½ times the safety valve setting.

    A boiler steam pressure gauge should have a range of:

    1 ½ to 2 times the safety valve setting.

    The maximum size of the bottom blowdown line and the surface blowdown line is:

    <p>2 1/2&quot;.</p> Signup and view all the answers

    During startup, the boiler vent should remain open until a pressure of:

    <p>approximately 3 psi is on the boiler.</p> Signup and view all the answers

    No. 6 fuel oil must be heated to reach the required temperature for combustion.

    <p>True</p> Signup and view all the answers

    No. 6 fuel oil must be heated in order to be pumped.

    <p>True</p> Signup and view all the answers

    Fuel oil heaters must be used when burning:

    <p>No. 6 fuel oil</p> Signup and view all the answers

    Water weighs approximately:

    <p>8.3 lb/gal.</p> Signup and view all the answers

    In order to burn 1 lb. of fuel, approximately how much air is needed?

    <p>15 lb.</p> Signup and view all the answers

    A low pressure steam boiler has a maximum allowable working pressure (MAWP) of up to:

    <ol start="15"> <li></li> </ol> Signup and view all the answers

    A boiler generating 20,000 lb of steam/hr must be supplied with at least:

    <p>20,000 lb of water/hr.</p> Signup and view all the answers

    Needed for the combustion of fuel is made up of approximately:

    <p>21% oxygen and 79% nitrogen.</p> Signup and view all the answers

    The automatic non-return valve on a boiler being cut in on a line should be opened when the steam pressure on the boiler reaches:

    <p>75% to 85% of the line pressure.</p> Signup and view all the answers

    A sudden drop in boiler steam pressure without a corresponding drop in boiler water temperature could result in a boiler explosion.

    <p>True</p> Signup and view all the answers

    Super heater tubes are protected from warping or burning out by:

    <p>a continuous flow of steam.</p> Signup and view all the answers

    Because of the large volume of water, the boiler most likely to cause a boiler explosion is:

    <p>Fire tube boiler</p> Signup and view all the answers

    Stays and braces are needed to prevent bulging in:

    <p>a fire tube boiler (high or low pressure).</p> Signup and view all the answers

    After a boiler has had major repair work made on its steam or water side or has developed a low water condition, it should be subjected to:

    <p>a hydrostatic test.</p> Signup and view all the answers

    An indication of a dirty fuel oil strainer would be:

    <p>a large pressure drop across the strainer.</p> Signup and view all the answers

    If air supplied for combustion mixes with gases of combustion, it could lead to a loss of air for combustion and lower boiler efficiency.

    <p>True</p> Signup and view all the answers

    Chemicals added to the boiler water change the scale-forming salts into:

    <p>a non-adhering sludge.</p> Signup and view all the answers

    The purpose of a flame failure control is to protect the boiler from:

    <p>a possible furnace explosion.</p> Signup and view all the answers

    To eliminate the danger of a furnace explosion during startup, the firing sequence must first allow for:

    <p>a pre purge period.</p> Signup and view all the answers

    A secondary means of determining water level in a boiler are:

    <p>try cocks.</p> Signup and view all the answers

    The boiler steam-pressure gauge is protected from high temperatures by:

    <p>a siphon.</p> Signup and view all the answers

    The rotary cup burner atomizes fuel oil using:

    <p>a spinning cup and high velocity air.</p> Signup and view all the answers

    Flow meters measure:

    <p>the rate of flow of a variety of fluids.</p> Signup and view all the answers

    The open feed water heater is located:

    <p>above the feed water pump(s).</p> Signup and view all the answers

    The positioning combustion control system used on older boilers cannot function without air pressure.

    <p>True</p> Signup and view all the answers

    The air-to-gas ratio is maintained by a(n):

    <p>air damper, butterfly valve, and modulating motor and linkage.</p> Signup and view all the answers

    Draft is defined as:

    <p>a difference in pressure that causes air or gases to flow.</p> Signup and view all the answers

    On the fuel oil system, the purpose of the duplex strainers on the suction line between the tank and fuel oil pump is:

    <p>to allow one strainer to be cleaned without securing the boiler.</p> Signup and view all the answers

    The cold lime-soda process is used to:

    <p>soften the boiler water at ambient temperature.</p> Signup and view all the answers

    Safety valve connections must be approved by the American Society of Mechanical Engineers (ASME).

    <p>True</p> Signup and view all the answers

    An accumulation of combustible gases can cause a furnace explosion.

    <p>True</p> Signup and view all the answers

    New or re-tubed boilers should be cleaned with:

    <p>an alkaline detergent solution.</p> Signup and view all the answers

    An boiler accumulation test is conducted to:

    <p>test the relieving capacity of a safety valve.</p> Signup and view all the answers

    The underfeed stoker can burn:

    <p>All of the above</p> Signup and view all the answers

    In a water tube boiler, heat and gases of combustion pass:

    <p>around the tubes.</p> Signup and view all the answers

    A solenoid valve is:

    <p>a direct-acting valve in the gas system and is used as an automatic gas shutoff valve.</p> Signup and view all the answers

    A fire caused by oil, gas, grease, or paint is classified as:

    <p>Class B fire</p> Signup and view all the answers

    A balanced draft system is defined as:

    <p>draft pressure maintained at a constant pressure.</p> Signup and view all the answers

    What is extracted from the turbine after it has passed through some of the turbine stages to be used for process work and heating?

    <p>Steam.</p> Signup and view all the answers

    Test the safety valve on an incoming boiler by hand:

    <p>before the boiler is cut in on the line.</p> Signup and view all the answers

    Super heater safety valves are set to open before the main safety valves are set to open.

    <p>True</p> Signup and view all the answers

    The induced draft fan is located:

    <p>between the boiler and the chimney.</p> Signup and view all the answers

    A quick-opening valve is used as a bottom blowdown valve:

    <p>it must be located between the boiler and the slow-opening (screw-type) valve.</p> Signup and view all the answers

    The type of coal most likely to have problems with spontaneous combustion when being stockpiled is:

    <p>Bituminous coal.</p> Signup and view all the answers

    Blowdown tanks are used to:

    <p>protect sewer lines from the high temperature and high pressure coming from the boiler blowdown lines.</p> Signup and view all the answers

    When testing a safety valve by hand, there must be:

    <p>at least 75% of the popping pressure.</p> Signup and view all the answers

    Feed water regulator sensing elements are located:

    <p>at the normal operating water level (NOWL).</p> Signup and view all the answers

    Draft in the boiler is measured between what two points?

    <p>atmosphere; and inside the boiler setting.</p> Signup and view all the answers

    Designed to direct the gases of combustion so that they come into close contact with the boiler heating surface are called:

    <p>baffles.</p> Signup and view all the answers

    The boiler vent should be opened when the steam pressure in the boiler has dropped to:

    <p>10 psi or 15 psi.</p> Signup and view all the answers

    Deciding the frequency of blowdown of a boiler is determined by a:

    <p>boiler water analysis.</p> Signup and view all the answers

    Cyclone separators are used in:

    <p>boilers equipped with super heaters.</p> Signup and view all the answers

    Larger steam boilers that are equipped with air heaters and/or economizers must use both forced and induced draft fans.

    <p>True</p> Signup and view all the answers

    The purpose of the scanner is to:

    <p>prove both the pilot and the main flame.</p> Signup and view all the answers

    The scanner must be installed on the front of the boiler to:

    <p>sight both the pilot and the main flame.</p> Signup and view all the answers

    Duplex strainers are found on both the suction and discharge sides of the fuel oil pump.

    <p>True</p> Signup and view all the answers

    A high water level condition in the boiler can be corrected by:

    <p>using bottom blowdown.</p> Signup and view all the answers

    The heating value of a fuel is expressed in:

    <p>British thermal units.</p> Signup and view all the answers

    The volume of gas to the burner in a high pressure gas system is controlled by:

    <p>a butterfly valve.</p> Signup and view all the answers

    The low water fuel cutoff control can be tested by:

    <p>blowing down the low water fuel cutoff or allowing the water level in the boiler to drop.</p> Signup and view all the answers

    Pulverized coal has the consistency of talcum powder so that it can come in closer contact with oxygen for complete combustion.

    <p>True</p> Signup and view all the answers

    Anthracite coal has a high carbon content.

    <p>True</p> Signup and view all the answers

    The Orsat gas analyzer measures the percentage of:

    <p>carbon dioxide, carbon monoxide, and oxygen in the flue gas.</p> Signup and view all the answers

    A combustible found in fuel includes:

    <p>carbon, sulfur, and hydrogen.</p> Signup and view all the answers

    Small amounts of water that leave the boiler with the steam are called:

    <p>carryover.</p> Signup and view all the answers

    Caustic embrittlement is defined as:

    <p>cracking of the boiler metal along the seams and tube ends.</p> Signup and view all the answers

    Boiler water having high alkalinity could develop caustic embrittlement.

    <p>True</p> Signup and view all the answers

    Steam separators work on the principle of:

    <p>changing the direction of the steam flow.</p> Signup and view all the answers

    Regardless of the type of fuel being used, before lighting off a boiler during a cold start-up, the operator must first:

    <p>check for the correct boiler water level.</p> Signup and view all the answers

    The feed water stop valve on the feed water line is located closest to the shell of the boiler so that the:

    <p>check valve can be repaired without taking the boiler offline.</p> Signup and view all the answers

    Plant emergency procedures should be established by:

    <p>the chief engineer.</p> Signup and view all the answers

    The purpose of the fuel oil return line is:

    <p>circulate fuel oil during warm-up, return fuel oil that bypasses the burner, and return fuel oil from the relief.</p> Signup and view all the answers

    The boiler must be cleaned on both the fire and water sides to prepare it for inspection.

    <p>True</p> Signup and view all the answers

    The free-blowing drain between the boiler's automatic non-return valve and the main steam stop valve should be closed as soon as the boiler is cut in on the line.

    <p>True</p> Signup and view all the answers

    When a boiler is being inspected, the two main steam stop valves are closed, locked, and tagged.

    <p>True</p> Signup and view all the answers

    External feed water treatment conditions the feed water before it enters the boiler and can be a(n):

    <p>cold lime-soda, hot lime-soda, and ion exchange process.</p> Signup and view all the answers

    When all the fuel is burned using the minimal amount of excess air, it is called:

    <p>complete combustion.</p> Signup and view all the answers

    Carbon dioxide (CO2) in the flue gas indicates complete combustion.

    <p>True</p> Signup and view all the answers

    Types of combustion include:

    <p>All of the above</p> Signup and view all the answers

    The boiler should be laid up completely dry if there is a danger of the boiler freezing.

    <p>True</p> Signup and view all the answers

    Steam that has lost its heat and has turned back into water is called:

    <p>condensate.</p> Signup and view all the answers

    If the temperature of air entering the heater gets too low, it can cause condensation on the gas side of the air heater.

    <p>True</p> Signup and view all the answers

    Maintenance work performed inside a boiler requires a confined space permit that contains procedures to prevent possible injury from hazards.

    <p>True</p> Signup and view all the answers

    Closer control of boiler water chemical concentrations is maintained by:

    <p>continuous blowdowns.</p> Signup and view all the answers

    The programmer in the ON/OFF control system is used to:

    <p>control the burner firing cycle.</p> Signup and view all the answers

    Steam impinging on boiler tubes would:

    <p>cut through the boiler tubes in a very short period of time.</p> Signup and view all the answers

    The frequency of blowing down a steam boiler is best ascertained by:

    <p>the daily testing of boiler water.</p> Signup and view all the answers

    Fuel oil with a low flash point would be dangerous to use.

    <p>True</p> Signup and view all the answers

    The degree of hardness of the coal is referred to as:

    <p>rank.</p> Signup and view all the answers

    Most thermometers used in a steam plant are calibrated in:

    <p>degrees Fahrenheit.</p> Signup and view all the answers

    A gas pressure regulator is used to control:

    <p>the desired pressure at the burner.</p> Signup and view all the answers

    The sequence of three numbers found on the data plate attached to a reciprocating feedwater pump indicates the:

    <p>diameter of steam piston, diameter of water piston, and length of pump stroke.</p> Signup and view all the answers

    Natural draft is produced by:

    <p>a difference in temperature of a column of gas inside the chimney from a column of air outside the chimney.</p> Signup and view all the answers

    To reduce the heat loss of flue gases going to the chimney, boilers are equipped with:

    <p>economizers and air heaters.</p> Signup and view all the answers

    If a boiler that was on-line is down because of low steam pressure, the cause is:

    <p>flame failure or a low water condition.</p> Signup and view all the answers

    Study Notes

    Boiler Pressure and Testing

    • Pressure at the base of a vertical foot of water is 0.433 psi.
    • Hydrostatic test pressure for the boiler should be increased to 1.5 times the safety valve setting.
    • Boiler steam pressure gauges must have a range of 1.5 to 2 times the safety valve setting.

    Boiler Operations

    • Maximum size for bottom and surface blowdown lines is 2.5 inches.
    • During startup, keep the boiler vent open until pressure reaches approximately 3 psi.
    • No. 6 fuel oil must be heated both for combustion and to be pumped effectively.

    Fuel and Combustion

    • Combustion of 1 lb of fuel requires approximately 15 lb of air, which consists of 21% oxygen and 79% nitrogen.
    • A dirty fuel oil strainer is indicated by a significant pressure drop across it.
    • Complete combustion is signified by the presence of carbon dioxide (CO2) in the flue gas.

    Safety and Maintenance

    • A low-pressure steam boiler has a maximum allowable working pressure (MAWP) of 15 psi.
    • Automatic non-return valves should open when boiler steam pressure reaches 75% to 85% of the line pressure.
    • A flame failure control is vital to prevent possible furnace explosions.

    Boiler Design and Structure

    • Superheater tubes are protected from warping by maintaining a continuous flow of steam.
    • Fire tube boilers are most likely to cause explosions due to their large water volume.
    • Stays and braces are necessary to prevent bulging in fire tube boilers.

    Water and Chemical Management

    • Water weighs approximately 8.3 lb/gal.
    • Chemicals in boiler water convert scale-forming salts into non-adhering sludge.
    • High alkalinity in boiler water can lead to caustic embrittlement, which is cracking along seams and tube ends.

    Equipment and Components

    • Flow meters measure fluid flow rates.
    • Duplex strainers on suction lines allow cleaning without shutting down the boiler.
    • A gas pressure regulator maintains desired pressure at the burner and is essential for safe operation.

    Combustion Controls

    • Air-to-gas ratio is controlled via air dampers and modulating motors.
    • The scanner proves the pilot and main flame; its correct installation is vital for safe operation.
    • The underfeed stoker can burn anthracite or bituminous coal.

    Boiler Efficiency and Operation

    • Cyclone separators are used in boilers with superheaters for efficiency.
    • Economizers and air heaters reduce heat loss from flue gases.
    • Continuous blowdowns help maintain control over boiler water chemical concentrations.

    Testing and Inspection

    • Regular testing of the safety valve is necessary to ensure operational integrity.
    • Boiler inspection requires that main steam stop valves be closed, locked, and tagged.
    • The free-blowing drain should be closed immediately after the boiler is cut in on the line for safety.

    Emergency and Operational Procedures

    • Plant emergency procedures must be established by the chief engineer to ensure safety protocols are followed.
    • When preparing a boiler for inspection, both fire and water sides must be cleaned.
    • Correct boiler water levels must be checked before lighting off during cold start-up to prevent incidents.

    Other Key Points

    • The Orsat gas analyzer measures CO2, carbon monoxide, and oxygen in flue gas; useful for assessing combustion efficiency.
    • When storing coal, particular attention should be given to bituminous coal due to its spontaneous combustion risk.
    • For colder climates, boilers should be laid up dry to prevent freezing damage.

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    Prepare for the Ohio boiler test with these flashcards. Each card covers essential concepts, such as steam pressure, hydrostatic testing, and gauge specifications. Perfect for aspiring boiler operators and safety exam candidates.

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