4AE3 U11 C1 Review
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Questions and Answers

What is the primary function of a boiler according to the ABMA definition?

  • To manufacture industrial chemicals
  • To generate electricity
  • To heat water or generate steam under pressure or vacuum (correct)
  • To produce compressed air

    • Why is the control of steam energy crucial?

  • To increase the boiler's lifespan
  • To prevent destruction and ensure safety (correct)
  • To reduce the cost of maintenance
  • To reduce energy consumption

    • Who are considered important figures in the development of steam boilers during the Industrial Revolution?

  • Charles Darwin, Albert Einstein, and Marie Curie
  • Isaac Newton, Archimedes, and Galileo Galilei
  • Thomas Savery, Thomas Newcomen, James Watt, and Richard Trevithick (correct)
  • Alexander Graham Bell, Nikola Tesla, and Guglielmo Marconi

    • What was the major driving source behind the significant progress made during the Industrial Revolution?

    <p>The harnessing of steam power</p> Signup and view all the answers

    What is the term that describes the professionals responsible for the operation, maintenance, inspection, and repair of boilers and their related systems?

    <p>Power Engineers</p> Signup and view all the answers

    What is the result of uncontrolled steam energy, as demonstrated by history?

    <p>Great destruction</p> Signup and view all the answers

    What was the innovation of Trevithick's boiler design?

    <p>The use of firetubes to transfer heat</p> Signup and view all the answers

    What was the advantage of firetubes in boiler design?

    <p>They increased the ratio between boiler heating surface and water volume</p> Signup and view all the answers

    What was the significance of Stephen Wilcox's 'Safety Boiler' design?

    <p>It had a small internal water volume and small diameter pressure parts</p> Signup and view all the answers

    What was the reason for keeping the tubes straight in early Babcock and Wilcox boiler designs?

    <p>To facilitate mechanical waterside cleaning</p> Signup and view all the answers

    What is the primary difference between firetube and watertube boilers?

    <p>The direction of heat transfer</p> Signup and view all the answers

    What is the typical advantage of watertube boilers over firetube boilers?

    <p>They can be designed to be extremely large capacity high-pressure units</p> Signup and view all the answers

    What was the limitation of early watertube boilers?

    <p>They were prone to waterside scale and other conditions</p> Signup and view all the answers

    How did the development of Trevithick's boiler design impact the industry?

    <p>It led to improved steam cycles and better boilers</p> Signup and view all the answers

    What is the approximate steam temperature of modern high-pressure watertube boilers?

    <p>600°C</p> Signup and view all the answers

    What is the primary advantage of modern firetube boilers over earlier designs?

    <p>They are made of better materials and assembled with better methods</p> Signup and view all the answers

    What was the primary problem that Thomas Savery's engine solved in the early 1700s?

    <p>Pumping water out of coal mines</p> Signup and view all the answers

    What was the main difference between Thomas Newcomen's engine and Thomas Savery's engine?

    <p>Newcomen's engine could do more than just pump water</p> Signup and view all the answers

    What was the concern of Savery, Newcomen, and Watt regarding boiler design?

    <p>They were concerned about the safety of moderately pressurized boilers</p> Signup and view all the answers

    What was the typical design of a steam boiler in the time of Savery, Newcomen, and Watt?

    <p>A single, enclosed, riveted copper container</p> Signup and view all the answers

    What is the term for the part of a boiler where heat is transferred from combustion gases to boiler water?

    <p>Heating surface</p> Signup and view all the answers

    What was the main limitation of the Haycock boiler design?

    <p>It had a small heating surface and hot gases did not spend much time in contact with the heating surface</p> Signup and view all the answers

    What was the innovation of Richard Trevithick's high-pressure boiler designs?

    <p>Having an internal furnace and a chimney</p> Signup and view all the answers

    What was the main difference between James Watt's engine and Newcomen's engine?

    <p>Watt's engine used boiler pressure acting against a vacuum</p> Signup and view all the answers

    What was the primary reason for the inefficiency of the Haycock boiler design?

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

    What was the consequence of the early boiler designs being limited to low pressures?

    <p>They exploded with alarming frequency</p> Signup and view all the answers

    What is the primary purpose of the steel casing that covers the outside of the boiler and furnace?

    <p>To prevent combustion gas leakage into the boiler room</p> Signup and view all the answers

    What is unique about the support structure of a packaged watertube boiler?

    <p>It is supported by a steel structure and the weight of the steam drum is carried by the tubes</p> Signup and view all the answers

    What is the maximum pressure of superheated steam that can be delivered by the largest packaged watertube boilers?

    <p>Over 15 000 kPa</p> Signup and view all the answers

    What is the approximate amount of saturated steam produced per hour by a small packaged watertube boiler, like the one shown in Figure 9?

    <p>Around 850 kg</p> Signup and view all the answers

    What is one of the fuel choices available for packaged watertube boilers?

    <p>Natural gas</p> Signup and view all the answers

    What led to the development of large-scale boilers?

    <p>Development of water treatment chemistry</p> Signup and view all the answers

    What is the main advantage of bent watertube construction?

    <p>Increased heat transfer area</p> Signup and view all the answers

    What was a major cause of boiler explosions in the late 1800s?

    <p>Inconsistent boiler design and construction</p> Signup and view all the answers

    What was the outcome of the 1905 boiler explosion in Massachusetts?

    <p>The establishment of formal rules for boiler design and construction in Massachusetts</p> Signup and view all the answers

    What is the purpose of the ASME Boiler and Pressure Vessel Code?

    <p>To standardize boiler design and construction methods</p> Signup and view all the answers

    What is the difference between power boilers and heating boilers?

    <p>Power boilers operate at high pressure and temperature, while heating boilers operate at low pressure and temperature</p> Signup and view all the answers

    Which of the following is an example of a component that extracts more heat from combustion gases?

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

    What is the significance of the ASME BPVC in the boiler industry?

    <p>It sets standards for boiler design and construction</p> Signup and view all the answers

    What is the typical operating pressure of power boilers that produce steam?

    <p>Greater than 100 kPa gauge pressure</p> Signup and view all the answers

    Which of the following is NOT a significant advancement in boiler design?

    <p>Pneumatic boiler control systems</p> Signup and view all the answers

    What is the maximum operating pressure of heating boilers designed to produce hot water?

    <p>1.1 MPa</p> Signup and view all the answers

    What is the primary advantage of using hot oil in boilers?

    <p>Achieving high temperatures without high operating pressure</p> Signup and view all the answers

    What is the purpose of thermo-flooding boilers?

    <p>To inject heat into the ground for oil production</p> Signup and view all the answers

    What is the primary goal of modern boiler design?

    <p>To produce a boiler that is safe, efficient in operation, and economical in fuel consumption</p> Signup and view all the answers

    What is the main purpose of circulating water in a boiler?

    <p>To remove heat from the boiler tubes</p> Signup and view all the answers

    What is the minimum requirement for the steam space of a boiler?

    <p>It should be large enough for the steam to rise freely from the surface of the water</p> Signup and view all the answers

    What is the maximum temperature for heating boilers designed to produce hot water?

    <p>120°C</p> Signup and view all the answers

    What is the name of the code that covers the design and construction of all types of boilers?

    <p>ASME BPVC</p> Signup and view all the answers

    What type of boiler is designed to produce electrical power?

    <p>High-pressure, high-temperature, and high-capacity boiler</p> Signup and view all the answers

    What is the purpose of proper insulation in a boiler?

    <p>To minimize heat loss to the surroundings</p> Signup and view all the answers

    What is a potential consequence of steam containing water in machinery?

    <p>Damage to machinery</p> Signup and view all the answers

    What is a key requirement for the design of a boiler?

    <p>To be simple in construction and easy to maintain</p> Signup and view all the answers

    What is a characteristic of a packaged boiler?

    <p>It is completely factory-built and sold as a package</p> Signup and view all the answers

    What is an advantage of packaged boilers?

    <p>They have lower construction costs and purchase price</p> Signup and view all the answers

    What is a type of boiler that is often produced as a packaged unit?

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

    What is the maximum size of packaged boilers limited by?

    <p>Railway or roadway height and width restrictions</p> Signup and view all the answers

    What is a characteristic of packaged firetube boilers?

    <p>They are suitable for high-pressure or high-temperature service</p> Signup and view all the answers

    What is the purpose of a boiler's allowance for expansion and contraction?

    <p>To prevent damaging stresses</p> Signup and view all the answers

    What is a necessary feature of a boiler's design?

    <p>To absorb the maximum amount of heat available</p> Signup and view all the answers

    What is the purpose of a boiler's pressure relief valves?

    <p>To provide a safety feature for the boiler</p> Signup and view all the answers

    What is the primary factor that necessitates the need for efficient, safe, and reliable boilers?

    <p>The potential for uncontrolled energy release</p> Signup and view all the answers

    What is the key aspect of the Industrial Revolution that contributed to previously unimagined levels of prosperity and productivity?

    <p>The harnessing of steam power</p> Signup and view all the answers

    What is the primary role of Power Engineers in the context of boilers and their related systems?

    <p>To operate, maintain, inspect, and repair boilers</p> Signup and view all the answers

    What is the ultimate consequence of the uncontrolled release of steam energy?

    <p>Destruction and chaos</p> Signup and view all the answers

    What is the central idea behind the definition of a boiler provided by the ABMA?

    <p>A boiler is a device that produces energy under pressure or vacuum</p> Signup and view all the answers

    What is the significance of the historical development of steam boilers in the context of the Industrial Revolution?

    <p>It was a major turning point in the Industrial Revolution</p> Signup and view all the answers

    What is the primary function of the steel structure in a packaged watertube boiler?

    <p>To support the weight of the mud drum</p> Signup and view all the answers

    What is the significance of the special concrete footings required for packaged watertube boilers?

    <p>They help to distribute the weight of the boiler and its water content</p> Signup and view all the answers

    What is the typical operating pressure range of the largest packaged watertube boilers?

    <p>Up to 15 000 kPa</p> Signup and view all the answers

    What is the primary advantage of using natural gas as a fuel source for packaged watertube boilers?

    <p>It is more environmentally friendly than other fuels</p> Signup and view all the answers

    What is the purpose of the mud drum in a packaged watertube boiler?

    <p>To separate the water from the steam in the boiler</p> Signup and view all the answers

    What is the main advantage of using firetubes in boiler design?

    <p>Increased heating surface area</p> Signup and view all the answers

    What was the primary advantage of Stephen Wilcox's 'Safety Boiler' design?

    <p>Improved safety</p> Signup and view all the answers

    What is the primary difference between bent tube and straight tube watertube boiler designs?

    <p>Tube shape</p> Signup and view all the answers

    What is the main limitation of early boiler designs?

    <p>Limited to low pressures</p> Signup and view all the answers

    What is the primary advantage of modern watertube boilers over firetube boilers?

    <p>Increased capacity and high-pressure capabilities</p> Signup and view all the answers

    What is the main reason for the development of large-scale boilers?

    <p>Increased demand for steam power</p> Signup and view all the answers

    What was the primary factor that led to the development of large-scale boilers?

    <p>Advances in water treatment chemistry</p> Signup and view all the answers

    What is the primary advantage of using multiple firetubes in boiler design?

    <p>Increased heating surface area</p> Signup and view all the answers

    What is the main difference between power boilers and heating boilers?

    <p>Design and construction rules</p> Signup and view all the answers

    What was the significance of Richard Trevithick's high-pressure boiler designs?

    <p>Paved the way for modern steam locomotives and industrialization</p> Signup and view all the answers

    What was the outcome of the 1905 boiler explosion in Massachusetts?

    <p>Massachusetts became the first US jurisdiction to enact formal rules for boiler design and construction</p> Signup and view all the answers

    What is the primary advantage of using watertube boilers in electric power generation?

    <p>High-pressure and high-temperature capabilities</p> Signup and view all the answers

    What is the primary difference between firetube and watertube boilers?

    <p>Heat transfer mechanism</p> Signup and view all the answers

    What is the purpose of the ASME Boiler and Pressure Vessel Code?

    <p>To establish standards for boiler design and construction</p> Signup and view all the answers

    What is the significance of bent watertube construction in boiler design?

    <p>It allows for a larger heat transfer area</p> Signup and view all the answers

    What was the primary cause of boiler explosions in the late 1800s?

    <p>Inconsistent and inadequate boiler design</p> Signup and view all the answers

    What is the purpose of internal steam/water separation devices in boiler design?

    <p>To separate steam from water in the boiler</p> Signup and view all the answers

    What is the advantage of all-welded construction in boiler design?

    <p>It makes the weld joints as strong as the parent metal</p> Signup and view all the answers

    What was the primary reason for the inefficiency of early steam boiler designs in the 1700s?

    <p>The heating surface was small, and the hot gases did not spend much time in contact with it.</p> Signup and view all the answers

    What is the purpose of economizers in boiler design?

    <p>To extract more heat from the combustion gases</p> Signup and view all the answers

    What was the main innovation of Richard Trevithick's high-pressure boiler designs?

    <p>The development of a internal furnace that reduces heat losses.</p> Signup and view all the answers

    What is the significance of the 1911 appeal to the American Society of Mechanical Engineers?

    <p>It led to the development of the ASME Boiler and Pressure Vessel Code</p> Signup and view all the answers

    What was the main limitation of the boilers developed by Savery, Newcomen, and Watt?

    <p>They were limited to low-pressure applications due to design and manufacturing weaknesses.</p> Signup and view all the answers

    What is the term for the part of a boiler where heat is transferred from combustion gases to boiler water?

    <p>Heating surface.</p> Signup and view all the answers

    What was the primary advantage of James Watt's engine over Newcomen's engine?

    <p>It was more powerful due to the use of boiler pressure.</p> Signup and view all the answers

    What was the primary consequence of the early boiler designs being limited to low pressures?

    <p>They were more prone to explosions.</p> Signup and view all the answers

    What was the primary difference between the Haycock boiler and Trevithick's boiler designs?

    <p>The Haycock boiler was externally fired, while Trevithick's design was internally fired.</p> Signup and view all the answers

    What was the primary advantage of Watt's engine over earlier designs?

    <p>It was more powerful due to the use of boiler pressure.</p> Signup and view all the answers

    What was the primary reason for the development of high-pressure boilers?

    <p>To increase the power output of steam engines.</p> Signup and view all the answers

    What was the primary limitation of the furnace design in the Haycock boiler?

    <p>It was located outside the shell, reducing heat transfer.</p> Signup and view all the answers

    What is the primary consideration in modern boiler design to prevent overheating of the boiler metal?

    <p>Thorough circulation of water through all parts of the boiler</p> Signup and view all the answers

    What is the purpose of the steam space in a boiler?

    <p>To allow the steam to rise freely from the surface of the water</p> Signup and view all the answers

    Which type of boiler is designed to operate at pressures not exceeding 1.1 MPa and a temperature not exceeding 120°C?

    <p>Heating boiler designed to produce hot water</p> Signup and view all the answers

    What is the primary advantage of using hot oil in boilers?

    <p>Ability to achieve high temperatures without high operating pressure</p> Signup and view all the answers

    What is the main difference between field-erected boilers and packaged boilers?

    <p>Method of fabrication and installation</p> Signup and view all the answers

    What is the purpose of covering all parts of the boiler heating surface exposed to fire or hot gases with water?

    <p>To prevent overheating of the boiler metal</p> Signup and view all the answers

    What is the primary goal of the ASME Boiler and Pressure Vessel Code?

    <p>To establish standards for the design and construction of boilers</p> Signup and view all the answers

    What is the typical application of thermo-flooding boilers?

    <p>Oil production</p> Signup and view all the answers

    What is the primary characteristic of compact boilers?

    <p>Small size and capacity</p> Signup and view all the answers

    What is the main consideration in designing a boiler to produce steam?

    <p>Ensuring proper circulation of water</p> Signup and view all the answers

    Which of the following is a necessary feature of a boiler's design to prevent damaging stresses?

    <p>Allowance for expansion and contraction of all parts</p> Signup and view all the answers

    What is the primary advantage of packaged boilers over traditional boilers?

    <p>Lower construction and shipping costs</p> Signup and view all the answers

    What is the typical design limitation of packaged boilers?

    <p>Large size due to railway or roadway height and width restrictions</p> Signup and view all the answers

    What is the primary purpose of a boiler's pressure relief valves?

    <p>To prevent excessive pressure build-up</p> Signup and view all the answers

    What is the main difference between power boilers and heating boilers?

    <p>Power boilers are designed for electrical power generation, while heating boilers are designed for hot water systems</p> Signup and view all the answers

    What is the primary advantage of compact packaged boilers?

    <p>Smaller footprint and versatility in design</p> Signup and view all the answers

    What is the primary reason for testing and inspecting packaged boilers before site delivery?

    <p>To ensure the quality of the unit</p> Signup and view all the answers

    What is the primary characteristic of packaged firetube boilers?

    <p>Water-cooled furnace and mechanical draft systems</p> Signup and view all the answers

    What is the primary benefit of using packaged watertube boilers?

    <p>Greater design flexibility and high-pressure steam output</p> Signup and view all the answers

    What is the primary purpose of a boiler's gauges?

    <p>To monitor boiler pressure and temperature</p> Signup and view all the answers

    What is the main difference between field-assembled boilers and field-erected boilers?

    <p>Field-erected boilers are shipped in more pieces than field-assembled boilers</p> Signup and view all the answers

    What is the primary purpose of dedicated supports for the lower drum in packaged watertube boilers?

    <p>To hold the entire weight of the boiler and transfer the load to a level concrete base</p> Signup and view all the answers

    Why do larger field-erected boilers need to be placed on concrete pilings?

    <p>To provide additional support for the boiler's weight and its contents</p> Signup and view all the answers

    What is the primary consideration when placing a packaged watertube boiler on a concrete base?

    <p>The base must be level and have adequate strength to support the weight of the boiler</p> Signup and view all the answers

    What is the primary advantage of field-assembled boilers?

    <p>They require less site assembly of components</p> Signup and view all the answers

    What is the primary purpose of the supports in packaged watertube boilers?

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

    What is the purpose of beading in tube attachment?

    <p>To help the tubes grab onto the tubesheet</p> Signup and view all the answers

    Why are watertube attachments not beaded over?

    <p>Because the ends of the tubes are covered in water</p> Signup and view all the answers

    What is the purpose of refractory in boilers?

    <p>To protect metal surfaces from high temperatures</p> Signup and view all the answers

    What is the difference between insulation and refractory?

    <p>Insulation is used for low-temperature zones, while refractory is used for high-temperature zones</p> Signup and view all the answers

    Why are tubes attached by welding generally more suitable for higher-pressure service?

    <p>Because they provide a stronger attachment</p> Signup and view all the answers

    What is the main purpose of surrounding the furnace with water-containing vessel components in modern boilers?

    <p>To reduce the need for refractory</p> Signup and view all the answers

    How are bottom-supported boilers typically affixed to their foundations?

    <p>At only one end</p> Signup and view all the answers

    What is unique about the support structure of large field-erected boilers?

    <p>They are supported from above</p> Signup and view all the answers

    What is the primary purpose of a boiler's steam drum?

    <p>To generate steam</p> Signup and view all the answers

    What is the main advantage of using shop-fabricated components for field-erected boilers?

    <p>Increased component quality</p> Signup and view all the answers

    How are the main cylindrical vessels of firetube and watertube boilers constructed?

    <p>By rolling and welding flat plate</p> Signup and view all the answers

    What is the purpose of the circumferential joints in a boiler's shell or drum?

    <p>To join multiple courses together</p> Signup and view all the answers

    Why are smaller diameter shells and drums often made from seamless steel pipe?

    <p>Because it is easier to form and shape</p> Signup and view all the answers

    What is the primary advantage of top-supported field-erected boilers?

    <p>They can expand freely in length</p> Signup and view all the answers

    What is the purpose of the refractory and insulation applied to the boiler exterior?

    <p>To reduce heat loss</p> Signup and view all the answers

    What is the primary difference between packaged and field-erected boilers?

    <p>Their design and construction</p> Signup and view all the answers

    What is the purpose of the steam drum in a watertube boiler?

    <p>To separate steam and water</p> Signup and view all the answers

    Why are flat heads in firetube boilers made extremely thick?

    <p>To prevent bulging under pressure</p> Signup and view all the answers

    What is the purpose of stays in firetube boilers?

    <p>To support unsupported tubesheet surfaces</p> Signup and view all the answers

    What is the most common head shape for a drum in a watertube boiler?

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

    What is the purpose of nozzles in watertube boilers?

    <p>To install pipe fittings and valves</p> Signup and view all the answers

    What is the purpose of headers in watertube boilers?

    <p>To distribute water to riser tubes</p> Signup and view all the answers

    What is the purpose of the mud drum in a watertube boiler?

    <p>To collect sediment and debris</p> Signup and view all the answers

    What is the purpose of the tubesheet in a firetube boiler?

    <p>To accept the attachment of firetubes</p> Signup and view all the answers

    What is the purpose of handholes and manholes in watertube boilers?

    <p>To provide access for inspection and maintenance</p> Signup and view all the answers

    What is the purpose of the heads in watertube boilers?

    <p>To enclose the drums and headers</p> Signup and view all the answers

    What is the purpose of access openings in boilers?

    <p>To allow for inspecting, maintaining, and repairing internal parts</p> Signup and view all the answers

    What is the main difference between watertubes and firetubes?

    <p>Watertubes are designed to withstand internal pressure, while firetubes are designed to withstand external pressure</p> Signup and view all the answers

    What is the purpose of handholes and manholes in boilers?

    <p>To allow for the inspection and maintenance of internal parts</p> Signup and view all the answers

    What is the purpose of gaskets in manhole and handhole plates?

    <p>To seal the plate to the shell, drum, or head</p> Signup and view all the answers

    What is the method used to fasten tubes to drums or tubesheets?

    <p>Expanding the tube end into the tube hole</p> Signup and view all the answers

    What is the purpose of beading the end of a firetube?

    <p>To keep the end of the firetube cool during operation</p> Signup and view all the answers

    What type of tubes are used in high-pressure service?

    <p>Seamless tubes</p> Signup and view all the answers

    What is the purpose of the ASME BPVC code in relation to boiler tubes?

    <p>To provide guidelines for the design and manufacture of boiler tubes</p> Signup and view all the answers

    What is the difference between the way watertubes and firetubes are attached to the drum or tubesheet?

    <p>Watertubes are expanded, while firetubes are welded</p> Signup and view all the answers

    What is the purpose of the expander tool used in expanding tubes?

    <p>To expand the tube end into the tube hole</p> Signup and view all the answers

    What is the primary reason for categorizing large watertube boilers as field-assembled or field-erected?

    <p>They are too large to ship as complete boilers.</p> Signup and view all the answers

    What is the purpose of the dedicated supports for the lower drum in a packaged watertube boiler?

    <p>To support the entire weight of the boiler and its contents.</p> Signup and view all the answers

    What is a necessary consideration when placing a packaged watertube boiler on a foundation?

    <p>The reinforced concrete base's strength and levelness.</p> Signup and view all the answers

    What is the primary difference between field-assembled and field-erected boilers?

    <p>The number of components that require site assembly.</p> Signup and view all the answers

    What is the purpose of the concrete pilings that support larger field-erected boilers?

    <p>To provide additional support for the boiler's weight.</p> Signup and view all the answers

    What is a characteristic of the boiler components that require field assembly in field-assembled boilers?

    <p>They are built and tested in the factory shop before delivery.</p> Signup and view all the answers

    What is the primary reason for supporting field-erected boilers from the top?

    <p>To allow for expansion in length</p> Signup and view all the answers

    What is the purpose of the longitudinal joint in a boiler's shell or drum?

    <p>To weld the edges of the plate together</p> Signup and view all the answers

    What is the primary difference between the main cylindrical pressure vessel of a firetube and watertube boiler?

    <p>The name of the vessel</p> Signup and view all the answers

    What is the purpose of the mud drum in a field-erected boiler?

    <p>To hang from the steam drum</p> Signup and view all the answers

    What is the primary characteristic of all boilers, regardless of type?

    <p>They are all pressure vessels</p> Signup and view all the answers

    What is the purpose of the circumferential joints in a boiler's shell or drum?

    <p>To join courses together</p> Signup and view all the answers

    What is the primary advantage of using thicker plate in a boiler's design?

    <p>It allows for higher pressures</p> Signup and view all the answers

    What is the primary consideration when designing a boiler to prevent overheating of the boiler metal?

    <p>The operating pressure and temperature</p> Signup and view all the answers

    What is the primary purpose of the overhead structural steel framework in a field-erected boiler?

    <p>To support the steam drum and upper headers</p> Signup and view all the answers

    What is the purpose of beading in tube attachment?

    <p>To keep the tubes from bulging out of the tubesheet</p> Signup and view all the answers

    What is the primary difference between the way smaller and larger field-erected boilers are supported?

    <p>The method of support</p> Signup and view all the answers

    What is the primary advantage of welded tube attachments over expanded attachments?

    <p>They are more suitable for higher-pressure service</p> Signup and view all the answers

    What is the primary purpose of refractory in boilers?

    <p>To protect metal surfaces from high temperatures</p> Signup and view all the answers

    What is the purpose of surrounding the furnace with water-containing vessel components in modern boilers?

    <p>To maximize the exposure of heat transfer surface to radiant heat</p> Signup and view all the answers

    What is the difference between insulation and refractory in boilers?

    <p>Insulation is used for low-temperature applications, while refractory is used for high-temperature applications</p> Signup and view all the answers

    What is the purpose of the flare at the end of a watertube in a watertube boiler?

    <p>To prevent the tube from being pushed out of the drum</p> Signup and view all the answers

    What is the primary purpose of access openings in boilers?

    <p>To facilitate inspection, maintenance, and repair of internal parts</p> Signup and view all the answers

    What type of gasket is typically used in high-pressure boilers?

    <p>Spiral-wound metallic</p> Signup and view all the answers

    What is the primary difference between firetubes and watertubes?

    <p>Firetubes are under external pressure, while watertubes are under internal pressure</p> Signup and view all the answers

    What is the purpose of expanding tube ends in boiler tube attachment?

    <p>To provide a tight seal between the tube and the tubesheet</p> Signup and view all the answers

    What is the minimum size of handhole and manhole openings mandated by?

    <p>Both ASME BPVC and CSA</p> Signup and view all the answers

    What is the primary purpose of beading in tube attachment?

    <p>To reduce the risk of tube overheating</p> Signup and view all the answers

    What is the primary advantage of using seamless tubes in high-pressure boilers?

    <p>They are better suited for high-pressure service</p> Signup and view all the answers

    What is the purpose of the expander tool used in expanding tubes?

    <p>To expand the tube end into the tube hole</p> Signup and view all the answers

    What is the primary purpose of the headers in watertube boilers?

    <p>To distribute water to the riser tubes</p> Signup and view all the answers

    What is the primary purpose of the ASME BPVC code in relation to boiler tubes?

    <p>To provide guidelines for tube attachment and inspection</p> Signup and view all the answers

    What is the significance of the convex shape of watertube boiler heads?

    <p>To provide strength and support to the head</p> Signup and view all the answers

    What is the primary difference between tubes and pipes used in boilers?

    <p>Tubes are made of thinner, higher-quality materials for better heat transfer</p> Signup and view all the answers

    What is the primary function of the stays in firetube boilers?

    <p>To support the tubesheet</p> Signup and view all the answers

    What is the purpose of the nozzles in shells, drums, and headers?

    <p>To attach pipe fittings and valves</p> Signup and view all the answers

    What is the significance of the ellipsoidal shape of watertube boiler drums?

    <p>To provide strength and support to the drum</p> Signup and view all the answers

    What is the primary difference between the heads of firetube and watertube boilers?

    <p>The shape of the heads</p> Signup and view all the answers

    What is the purpose of the handholes and manholes in watertube boiler heads?

    <p>To inspect and maintain the boiler</p> Signup and view all the answers

    What is the significance of the groove butt-welds in the construction of drums and headers?

    <p>To attach the heads to the drums and headers</p> Signup and view all the answers

    What is the primary purpose of the mud drum in watertube boilers?

    <p>To accumulate sediment and debris</p> Signup and view all the answers

    What is the significance of the torispherical shape of some watertube boiler heads?

    <p>To provide strength and support to the head</p> Signup and view all the answers

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