4AE3 U11 C6 Review
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Questions and Answers

What is the main difference between ASME Section I and ASME Section IV?

  • The service limitations of the boilers (correct)
  • The size of the boilers
  • The material used in the boilers
  • The type of fuel used in the boilers

    • What is the minimum pressure for a boiler to be constructed under ASME Section I?

  • 25 psig (170 kPa)
  • 15 psig (100 kPa) (correct)
  • 10 psig (70 kPa)
  • 20 psig (140 kPa)

    • What is the maximum temperature for a high-temperature water boiler constructed under ASME Section I?

  • 220°F (100°C)
  • 200°F (90°C)
  • 280°F (140°C)
  • 250°F (120°C) (correct)

    • Can a boiler that falls under ASME Section IV be constructed and stamped under ASME Section I?

    <p>Yes, as long as it meets all applicable requirements</p> Signup and view all the answers

    What is the section of the ASME BPVC that deals with the rules for construction of Heating Boilers?

    <p>ASME Section IV</p> Signup and view all the answers

    What is the pressure above which high-temperature water boilers are governed by ASME Section I?

    <p>160 psig (1.1 MPa)</p> Signup and view all the answers

    What is the saturation temperature of water at 70 kPa?

    <p>117°C</p> Signup and view all the answers

    What is the maximum pressure for operation of steam boilers as per the given rules?

    <p>100 kPa</p> Signup and view all the answers

    What is the maximum temperature allowed for cast iron in ASME I?

    <p>230°C</p> Signup and view all the answers

    What is the purpose of the maximum allowable working pressure (MAWP) in boiler design?

    <p>To determine the thickness of the boiler components</p> Signup and view all the answers

    What type of boilers are more likely to require exotic, high-cost alloys?

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

    What is the main reason for the difference in design considerations between heating boilers and power boilers?

    <p>Higher stresses and greater risks</p> Signup and view all the answers

    What is the effect of increasing temperature on the pressure rating of a pressure-retaining component?

    <p>It decreases the pressure rating</p> Signup and view all the answers

    What does the letter 'H' on a boiler shell indicate?

    <p>The boiler is designed to ASME IV</p> Signup and view all the answers

    What is the material of construction for all cast iron boilers?

    <p>ASME IV Part HC</p> Signup and view all the answers

    What is the purpose of the service rating of a pressurized component?

    <p>To determine the maximum safe temperature and pressure</p> Signup and view all the answers

    What is the maximum allowable working pressure that can be estimated from the pressure gauge scale on a heating boiler?

    <p>60 psi</p> Signup and view all the answers

    What is the reason for the prohibition of installing a safety valve with a pressure set point higher than the MAWP of the boiler?

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

    What is the approximate force contained by the shell of a firetube boiler operating at 1700 kPag?

    <p>34 000 kN</p> Signup and view all the answers

    Why do heating boiler safety valves have a larger body than power boiler safety valves?

    <p>Because low-pressure steam has a larger specific volume</p> Signup and view all the answers

    What is the saturation temperature of water at 1700 kPa?

    <p>207°C</p> Signup and view all the answers

    What is the maximum set point of a heating boiler safety valve?

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

    How many bottom blowoff valves are required for power boilers, according to ASME I?

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

    What is the main difference between the design considerations of heating boilers and power boilers?

    <p>Consideration of high pressure and high temperature exposure</p> Signup and view all the answers

    What is the main reason for differences in how power and heating boilers are constructed and operated?

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

    What is the reason for the difference in boiler design calculations between ASME I and ASME IV?

    <p>The forces contained by the boiler shell</p> Signup and view all the answers

    How often should the concentration of solids in the water be determined according to ASME VII C2.426?

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

    Why is frequent adjustment of continuous blowdown necessary?

    <p>To maintain a safe maximum water concentration in boilers</p> Signup and view all the answers

    What is the purpose of water treatment guidelines in ASME VI and VII?

    <p>To develop recommended practices for boiler operation and maintenance</p> Signup and view all the answers

    In which Canadian jurisdictions are power boilers allowed to operate unsupervised under special circumstances?

    <p>Only in certain jurisdictions with low-pressure and low-capacity boilers</p> Signup and view all the answers

    What is the minimum rating for a heating plant to require a Power Engineer to operate in Alberta?

    <p>750 kW</p> Signup and view all the answers

    Why are hot water heating plants of all capacities exempt from operator requirements in many Canadian jurisdictions?

    <p>Because they operate at lower pressures and temperatures</p> Signup and view all the answers

    What is the minimum temperature required for boiler blowoff discharged into a sewer system according to the CSA B-51 Code?

    <p>65°C (150°F)</p> Signup and view all the answers

    What is the maximum allowable working pressure for a low-pressure steam boiler's pressure control?

    <p>103 kPa (15 psi)</p> Signup and view all the answers

    What is the minimum number of gauge glasses required for power boilers operating over 3 MPa?

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

    Where must the lowest visible part of the water gauge glass be located in reference to the lowest permissible water level for heating boilers?

    <p>1 in. (25 mm) above</p> Signup and view all the answers

    What type of boilers do not have gauge glasses?

    <p>Heating and power boilers in hot water service</p> Signup and view all the answers

    What is the purpose of a blowoff vessel in a boiler system?

    <p>To reduce the temperature of the blowoff discharged into a sewer system</p> Signup and view all the answers

    What is the difference between the specific volume of low-pressure steam and low-pressure water that affects steam separation?

    <p>Greater for low-pressure steam and water</p> Signup and view all the answers

    What type of equipment may be required for large power boilers?

    <p>Centrifugal separators and scrubbers</p> Signup and view all the answers

    Where can the lowest permissible water level be found on a heating boiler?

    <p>Permanently marked on the boiler by the manufacturer</p> Signup and view all the answers

    What should be checked when in doubt about the type of boiler or its working pressure?

    <p>The operating certificate and shell stamping</p> Signup and view all the answers

    What is a common method of attaching tubes to tubesheets in some heating boilers?

    <p>O-rings or ferrules</p> Signup and view all the answers

    Why do power boilers have more detailed rules regarding operation and maintenance?

    <p>They present greater public and corporate risk</p> Signup and view all the answers

    What is the primary reason for the stricter water treatment requirements in power boilers?

    <p>To prevent corrosion and scaling</p> Signup and view all the answers

    What is the recommended frequency of bottom blowoff for heating boilers using hard water?

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

    Why is cast iron more tolerant of Class 1 water treatment?

    <p>It is more resistant to corrosion</p> Signup and view all the answers

    What is the purpose of recording results of observations in log sheets and logbooks?

    <p>To provide a record of checks and observations</p> Signup and view all the answers

    What is the advantage of using Class 2 water treatment over Class 1 water treatment?

    <p>It is recommended by ASME as a safer alternative</p> Signup and view all the answers

    How often may water tests, chemical additions, and blowdown adjustments be performed in power boilers?

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

    What is the purpose of ASME Section VI, Part 9.08?

    <p>To categorize water treatment for heating boilers</p> Signup and view all the answers

    Why is it important to keep the boiler waterside thoroughly cleaned in heating boilers with Class 1 water treatment?

    <p>To prevent scaling and overheating</p> Signup and view all the answers

    What is the primary difference between the boilers constructed under ASME Section I and ASME Section IV?

    <p>Service limitations</p> Signup and view all the answers

    According to ASME Section I, what is the minimum pressure required for a boiler to generate steam for use external to itself?

    <p>15 psig (100 kPa)</p> Signup and view all the answers

    What is the maximum temperature allowed for high-temperature water boilers constructed under ASME Section I?

    <p>250°F (120°C)</p> Signup and view all the answers

    Can a boiler that falls under ASME Section IV be constructed and stamped under ASME Section I?

    <p>Yes, provided all applicable requirements are met</p> Signup and view all the answers

    What is the purpose of the rules in ASME Section I?

    <p>To provide rules for the construction of power boilers</p> Signup and view all the answers

    What is the difference between the service limitations of ASME Section I and ASME Section IV?

    <p>Service limitations and operating conditions</p> Signup and view all the answers

    What is the primary reason for the differences in the design calculations between ASME I and ASME IV?

    <p>The difference in the temperature and pressure conditions they operate under</p> Signup and view all the answers

    Why is the strength of a pressure-retaining component dependent on temperature?

    <p>Because the pressure rating decreases as temperature increases</p> Signup and view all the answers

    What is the purpose of the service rating of a pressurized component?

    <p>To determine the minimum safe temperature and pressure</p> Signup and view all the answers

    Why are power boilers designed to be stronger than heating boilers?

    <p>Because they operate at higher pressures</p> Signup and view all the answers

    What is the effect of increasing temperature on the pressure rating of a pressure-retaining component?

    <p>It decreases the pressure rating</p> Signup and view all the answers

    Why are the rules of ASME I and ASME IV restricted to specific services?

    <p>Because they are based on the operating conditions of the boiler</p> Signup and view all the answers

    What is the main difference between the design considerations of ASME I and ASME IV?

    <p>The operating conditions of the boiler</p> Signup and view all the answers

    What is the primary reason for the prohibition of installing a safety valve with a pressure set point higher than the MAWP of the boiler?

    <p>To prevent the boiler from over-pressurizing</p> Signup and view all the answers

    What is the maximum pressure for operation of steam boilers according to the given rules?

    <p>1700 kPa</p> Signup and view all the answers

    What is the saturation temperature of water at 100 kPa?

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

    What is the maximum pressure at which cast iron can be used for boiler construction according to ASME I?

    <p>1.7 MPa</p> Signup and view all the answers

    What is the minimum pressure range that a pressure gauge on a heating boiler must be graduated to according to ASME IV?

    <p>30 psi to 60 psi</p> Signup and view all the answers

    Why do power boilers require more exotic materials than heating boilers?

    <p>Because they operate at higher pressures</p> Signup and view all the answers

    What is the purpose of the service rating of a pressurized component?

    <p>To determine the safe operating pressure range</p> Signup and view all the answers

    What is the primary reason for regulating the blowdown in boilers according to ASME VII C2.426?

    <p>To maintain a safe maximum water concentration</p> Signup and view all the answers

    Which type of boilers are exempt from operator requirements in many Canadian jurisdictions?

    <p>Hot water heating plants of all capacities</p> Signup and view all the answers

    What is the maximum temperature at which cast iron can be used for boiler construction according to ASME I?

    <p>230°C</p> Signup and view all the answers

    Why do heating boilers have larger safety valves than power boilers?

    <p>Because low-pressure steam has a larger specific volume</p> Signup and view all the answers

    What is the purpose of the recommended practices in ASME VI and VII?

    <p>To provide guidelines for water treatment and boiler operation</p> Signup and view all the answers

    What is the minimum pressure at which a boiler is considered a power boiler according to ASME I?

    <p>200 kPa</p> Signup and view all the answers

    What is the minimum rating for a heating plant to require a Power Engineer to operate in Alberta?

    <p>750 kW</p> Signup and view all the answers

    Why are smaller heating plants permitted to operate unattended in many Canadian jurisdictions?

    <p>Because operating conditions are not as severe</p> Signup and view all the answers

    What is the purpose of the shell stamping on a boiler?

    <p>To identify the boiler's type and design</p> Signup and view all the answers

    What is the basis for the boiler operating procedures in the PanGlobal textbooks?

    <p>The recommended practices in ASME VI and VII</p> Signup and view all the answers

    What is the reason for the difference in design considerations between heating boilers and power boilers?

    <p>Because of the difference in application and service requirements</p> Signup and view all the answers

    What is the maximum allowable working pressure that can be estimated from the pressure gauge scale on a power boiler?

    <p>Double the pressure at which the safety valve is set</p> Signup and view all the answers

    What is the primary requirement for a boiler with a working pressure exceeding 103 kPa (15 psi) when discharging blowoff into a sewer system?

    <p>A registered blowoff vessel or other suitable registered device must be placed between the boiler and sewer.</p> Signup and view all the answers

    What is the difference in the mounting of gauge glasses in reference to the lowest permissible water level (LPWL) between power boilers and heating boilers?

    <p>Power boilers have the lowest visible part of the water gage glass at least 2 in. (50 mm) above the LPWL, while heating boilers have it at least 1 in. (25 mm) above.</p> Signup and view all the answers

    What is the reason for the difference in steam separation equipment requirements between power boilers and heating boilers?

    <p>Power boilers require more detailed steam separation equipment due to the lower specific volume of high-pressure steam.</p> Signup and view all the answers

    What is the common method of attaching tubes to tubesheets in some power boilers?

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

    What is the purpose of the ASME I PG-60.1 requirement for the lowest visible water level in a gauge glass?

    <p>To ensure the gauge glass is at least 2 in. (50 mm) above the lowest permissible water level.</p> Signup and view all the answers

    Why is it important to verify the working pressure of a boiler by comparing the information on the shell stamping to the operating certificate?

    <p>To determine the type of boiler and its working pressure.</p> Signup and view all the answers

    What is the difference in the requirement for the lowest permissible water level marking between power boilers and heating boilers?

    <p>Power boilers require the marking to be at least 2 in. (50 mm) above the lowest permissible water level, while heating boilers require it to be at least 1 in. (25 mm) above.</p> Signup and view all the answers

    What is the primary reason for the difference in design considerations between power boilers and heating boilers?

    <p>The difference in pressure and temperature requirements.</p> Signup and view all the answers

    What is the purpose of the multi-stage steam separating equipment in large power boilers?

    <p>To separate high-pressure steam from water effectively.</p> Signup and view all the answers

    What is the requirement for the discharge of blowoff from a boiler having a working pressure exceeding 103 kPa (15 psi) into a sewer system?

    <p>The blowoff must be discharged into a blowoff vessel or other suitable registered device.</p> Signup and view all the answers

    What is the primary reason for the difference in water treatment requirements between power and heating boilers?

    <p>Power boilers are more prone to corrosion and overheating</p> Signup and view all the answers

    What is the purpose of recording results of observations in log sheets and logbooks?

    <p>To identify potential problems and take corrective action</p> Signup and view all the answers

    What is the significance of the rules in ASME Section I for power boilers?

    <p>They outline the requirements for the operation and maintenance of power boilers</p> Signup and view all the answers

    Why are cast iron boilers more tolerant of Class 1 water treatment?

    <p>Because cast iron is more resistant to corrosion than steel</p> Signup and view all the answers

    What is the purpose of the water treatment guidelines in ASME VI and VII?

    <p>To prevent corrosion and overheating in boilers</p> Signup and view all the answers

    What is the difference between the operation and maintenance of power boilers and heating boilers?

    <p>Power boilers have more detailed rules regarding operation and maintenance</p> Signup and view all the answers

    Why is it important to keep the boiler waterside thoroughly cleaned in heating boilers with Class 1 water treatment?

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

    What is the purpose of the bottom blowoff valve in a boiler?

    <p>To remove impurities from the boiler water</p> Signup and view all the answers

    Why do power boilers require more frequent checks of boiler operation and auxiliaries?

    <p>Because they present greater public and corporate risk</p> Signup and view all the answers

    What is the significance of the ASME BPVC sections that deal with boiler operation and maintenance?

    <p>They outline the requirements for the operation and maintenance of boilers</p> Signup and view all the answers

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