104 Questions
What is the main difference between ASME Section I and ASME Section IV?
The service limitations of the boilers
What is the minimum pressure for a boiler to be constructed under ASME Section I?
15 psig (100 kPa)
What is the maximum temperature for a high-temperature water boiler constructed under ASME Section I?
250°F (120°C)
Can a boiler that falls under ASME Section IV be constructed and stamped under ASME Section I?
Yes, as long as it meets all applicable requirements
What is the section of the ASME BPVC that deals with the rules for construction of Heating Boilers?
ASME Section IV
What is the pressure above which high-temperature water boilers are governed by ASME Section I?
160 psig (1.1 MPa)
What is the saturation temperature of water at 70 kPa?
117°C
What is the maximum pressure for operation of steam boilers as per the given rules?
100 kPa
What is the maximum temperature allowed for cast iron in ASME I?
230°C
What is the purpose of the maximum allowable working pressure (MAWP) in boiler design?
To determine the thickness of the boiler components
What type of boilers are more likely to require exotic, high-cost alloys?
Power boilers
What is the main reason for the difference in design considerations between heating boilers and power boilers?
Higher stresses and greater risks
What is the effect of increasing temperature on the pressure rating of a pressure-retaining component?
It decreases the pressure rating
What does the letter 'H' on a boiler shell indicate?
The boiler is designed to ASME IV
What is the material of construction for all cast iron boilers?
ASME IV Part HC
What is the purpose of the service rating of a pressurized component?
To determine the maximum safe temperature and pressure
What is the maximum allowable working pressure that can be estimated from the pressure gauge scale on a heating boiler?
60 psi
What is the reason for the prohibition of installing a safety valve with a pressure set point higher than the MAWP of the boiler?
To prevent overpressure
What is the approximate force contained by the shell of a firetube boiler operating at 1700 kPag?
34 000 kN
Why do heating boiler safety valves have a larger body than power boiler safety valves?
Because low-pressure steam has a larger specific volume
What is the saturation temperature of water at 1700 kPa?
207°C
What is the maximum set point of a heating boiler safety valve?
15 psi
How many bottom blowoff valves are required for power boilers, according to ASME I?
Two
What is the main difference between the design considerations of heating boilers and power boilers?
Consideration of high pressure and high temperature exposure
What is the main reason for differences in how power and heating boilers are constructed and operated?
The pressure and temperature of operation
What is the reason for the difference in boiler design calculations between ASME I and ASME IV?
The forces contained by the boiler shell
How often should the concentration of solids in the water be determined according to ASME VII C2.426?
Daily
Why is frequent adjustment of continuous blowdown necessary?
To maintain a safe maximum water concentration in boilers
What is the purpose of water treatment guidelines in ASME VI and VII?
To develop recommended practices for boiler operation and maintenance
In which Canadian jurisdictions are power boilers allowed to operate unsupervised under special circumstances?
Only in certain jurisdictions with low-pressure and low-capacity boilers
What is the minimum rating for a heating plant to require a Power Engineer to operate in Alberta?
750 kW
Why are hot water heating plants of all capacities exempt from operator requirements in many Canadian jurisdictions?
Because they operate at lower pressures and temperatures
What is the minimum temperature required for boiler blowoff discharged into a sewer system according to the CSA B-51 Code?
65°C (150°F)
What is the maximum allowable working pressure for a low-pressure steam boiler's pressure control?
103 kPa (15 psi)
What is the minimum number of gauge glasses required for power boilers operating over 3 MPa?
Two
Where must the lowest visible part of the water gauge glass be located in reference to the lowest permissible water level for heating boilers?
1 in. (25 mm) above
What type of boilers do not have gauge glasses?
Heating and power boilers in hot water service
What is the purpose of a blowoff vessel in a boiler system?
To reduce the temperature of the blowoff discharged into a sewer system
What is the difference between the specific volume of low-pressure steam and low-pressure water that affects steam separation?
Greater for low-pressure steam and water
What type of equipment may be required for large power boilers?
Centrifugal separators and scrubbers
Where can the lowest permissible water level be found on a heating boiler?
Permanently marked on the boiler by the manufacturer
What should be checked when in doubt about the type of boiler or its working pressure?
The operating certificate and shell stamping
What is a common method of attaching tubes to tubesheets in some heating boilers?
O-rings or ferrules
Why do power boilers have more detailed rules regarding operation and maintenance?
They present greater public and corporate risk
What is the primary reason for the stricter water treatment requirements in power boilers?
To prevent corrosion and scaling
What is the recommended frequency of bottom blowoff for heating boilers using hard water?
Weekly
Why is cast iron more tolerant of Class 1 water treatment?
It is more resistant to corrosion
What is the purpose of recording results of observations in log sheets and logbooks?
To provide a record of checks and observations
What is the advantage of using Class 2 water treatment over Class 1 water treatment?
It is recommended by ASME as a safer alternative
How often may water tests, chemical additions, and blowdown adjustments be performed in power boilers?
All of the above
What is the purpose of ASME Section VI, Part 9.08?
To categorize water treatment for heating boilers
Why is it important to keep the boiler waterside thoroughly cleaned in heating boilers with Class 1 water treatment?
To prevent scaling and overheating
What is the primary difference between the boilers constructed under ASME Section I and ASME Section IV?
Service limitations
According to ASME Section I, what is the minimum pressure required for a boiler to generate steam for use external to itself?
15 psig (100 kPa)
What is the maximum temperature allowed for high-temperature water boilers constructed under ASME Section I?
250°F (120°C)
Can a boiler that falls under ASME Section IV be constructed and stamped under ASME Section I?
Yes, provided all applicable requirements are met
What is the purpose of the rules in ASME Section I?
To provide rules for the construction of power boilers
What is the difference between the service limitations of ASME Section I and ASME Section IV?
Service limitations and operating conditions
What is the primary reason for the differences in the design calculations between ASME I and ASME IV?
The difference in the temperature and pressure conditions they operate under
Why is the strength of a pressure-retaining component dependent on temperature?
Because the pressure rating decreases as temperature increases
What is the purpose of the service rating of a pressurized component?
To determine the minimum safe temperature and pressure
Why are power boilers designed to be stronger than heating boilers?
Because they operate at higher pressures
What is the effect of increasing temperature on the pressure rating of a pressure-retaining component?
It decreases the pressure rating
Why are the rules of ASME I and ASME IV restricted to specific services?
Because they are based on the operating conditions of the boiler
What is the main difference between the design considerations of ASME I and ASME IV?
The operating conditions of the boiler
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?
To prevent the boiler from over-pressurizing
What is the maximum pressure for operation of steam boilers according to the given rules?
1700 kPa
What is the saturation temperature of water at 100 kPa?
120°C
What is the maximum pressure at which cast iron can be used for boiler construction according to ASME I?
1.7 MPa
What is the minimum pressure range that a pressure gauge on a heating boiler must be graduated to according to ASME IV?
30 psi to 60 psi
Why do power boilers require more exotic materials than heating boilers?
Because they operate at higher pressures
What is the purpose of the service rating of a pressurized component?
To determine the safe operating pressure range
What is the primary reason for regulating the blowdown in boilers according to ASME VII C2.426?
To maintain a safe maximum water concentration
Which type of boilers are exempt from operator requirements in many Canadian jurisdictions?
Hot water heating plants of all capacities
What is the maximum temperature at which cast iron can be used for boiler construction according to ASME I?
230°C
Why do heating boilers have larger safety valves than power boilers?
Because low-pressure steam has a larger specific volume
What is the purpose of the recommended practices in ASME VI and VII?
To provide guidelines for water treatment and boiler operation
What is the minimum pressure at which a boiler is considered a power boiler according to ASME I?
200 kPa
What is the minimum rating for a heating plant to require a Power Engineer to operate in Alberta?
750 kW
Why are smaller heating plants permitted to operate unattended in many Canadian jurisdictions?
Because operating conditions are not as severe
What is the purpose of the shell stamping on a boiler?
To identify the boiler's type and design
What is the basis for the boiler operating procedures in the PanGlobal textbooks?
The recommended practices in ASME VI and VII
What is the reason for the difference in design considerations between heating boilers and power boilers?
Because of the difference in application and service requirements
What is the maximum allowable working pressure that can be estimated from the pressure gauge scale on a power boiler?
Double the pressure at which the safety valve is set
What is the primary requirement for a boiler with a working pressure exceeding 103 kPa (15 psi) when discharging blowoff into a sewer system?
A registered blowoff vessel or other suitable registered device must be placed between the boiler and sewer.
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?
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.
What is the reason for the difference in steam separation equipment requirements between power boilers and heating boilers?
Power boilers require more detailed steam separation equipment due to the lower specific volume of high-pressure steam.
What is the common method of attaching tubes to tubesheets in some power boilers?
Rolling
What is the purpose of the ASME I PG-60.1 requirement for the lowest visible water level in a gauge glass?
To ensure the gauge glass is at least 2 in. (50 mm) above the lowest permissible water level.
Why is it important to verify the working pressure of a boiler by comparing the information on the shell stamping to the operating certificate?
To determine the type of boiler and its working pressure.
What is the difference in the requirement for the lowest permissible water level marking between power boilers and heating boilers?
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.
What is the primary reason for the difference in design considerations between power boilers and heating boilers?
The difference in pressure and temperature requirements.
What is the purpose of the multi-stage steam separating equipment in large power boilers?
To separate high-pressure steam from water effectively.
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?
The blowoff must be discharged into a blowoff vessel or other suitable registered device.
What is the primary reason for the difference in water treatment requirements between power and heating boilers?
Power boilers are more prone to corrosion and overheating
What is the purpose of recording results of observations in log sheets and logbooks?
To identify potential problems and take corrective action
What is the significance of the rules in ASME Section I for power boilers?
They outline the requirements for the operation and maintenance of power boilers
Why are cast iron boilers more tolerant of Class 1 water treatment?
Because cast iron is more resistant to corrosion than steel
What is the purpose of the water treatment guidelines in ASME VI and VII?
To prevent corrosion and overheating in boilers
What is the difference between the operation and maintenance of power boilers and heating boilers?
Power boilers have more detailed rules regarding operation and maintenance
Why is it important to keep the boiler waterside thoroughly cleaned in heating boilers with Class 1 water treatment?
To prevent overheating
What is the purpose of the bottom blowoff valve in a boiler?
To remove impurities from the boiler water
Why do power boilers require more frequent checks of boiler operation and auxiliaries?
Because they present greater public and corporate risk
What is the significance of the ASME BPVC sections that deal with boiler operation and maintenance?
They outline the requirements for the operation and maintenance of boilers
Test your knowledge on the operational pressures and temperatures of different types of boilers, including steam boilers, hot water heating boilers, and hot water supply boilers. Understand the rules and restrictions that govern their safe operation.
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