72 Questions
EASY What is the purpose of a pressure gauge on a steam boiler?
To indicate the boiler's internal pressure
What is the recommended graduation of the pressure gauge dial?
Twice the safety valve setting
Why is it beneficial to have the pressure gauge calibrated to double the safety valve setting?
It allows the operator to tell at a distance if the boiler is at its normal operating pressure
Why is a pressure gauge reading at mid-span more accurate?
Because it is less prone to mechanical error
Where should the pressure gauge be connected to?
To the steam space or to the water column or its steam connection
Why is it important to connect the pressure gauge to the steam space or water column?
To reduce the likelihood of blockage in the piping connection
What is the purpose of the shutoff valve adjacent to the gauge?
To isolate the gauge for maintenance or repair
Why is it prohibited to install another shutoff valve between the gauge and the boiler?
To ensure the accuracy of the gauge
What is the purpose of a siphon in a boiler pressure gauge?
To protect the pressure gauge from steam
Why is it necessary to fill siphons with distilled water prior to installation?
To protect the pressure-sensing device from steam
What is the minimum size of a syphon required by ASME BPVC I Part PG-60.6.1?
¼ in. (6 mm) inside diameter
What is the purpose of a master test pressure gauge?
To verify the accuracy of the boiler pressure gauge
What is the requirement for the connection to the boiler, except the syphon, according to ASME BPVC I Part PG-60.6.1?
Not less than NPS ¼ (DN 8) but where steel or wrought iron pipe or tubing is used, not less than ½ in. (13 mm) inside diameter
What is the function of a pigtail siphon?
To trap condensate and keep steam away from the pressure gauge
What is the requirement for the piping arrangement according to ASME BPVC I Part PG-60.6.1?
The piping arrangement must be equipped with tees, cross-tees, and plugs so that the pressure piping can be inspected and cleaned on a regular basis
What is the purpose of a valve connection according to ASME BPVC I Part PG-60.6.3?
To attach a test gauge when the boiler is in service
Why is it necessary to protect the pressure gauge from steam?
Because steam can reduce the accuracy of the pressure gauge
What is the requirement for the piping arrangement according to ASME BPVC IV Part HG-602?
The piping arrangement must contain a siphon or equivalent device that will develop and maintain a water seal
MEDIUM Why is it essential to equip each steam boiler with an accurate pressure gauge?
To prevent a pressure vessel explosion due to excessive internal pressure
What is the significance of the dial of the pressure gauge being graduated to approximately double the pressure at which the safety valve is set?
To enable the operator to determine the boiler's normal operating pressure from a distance
What is the purpose of connecting the pressure gauge to the steam space or water column?
To reduce the likelihood of blockage in the piping connection
Why is it important to have a shutoff valve adjacent to the pressure gauge?
To isolate the gauge for repair or replacement
What is the reason behind prohibiting the installation of another shutoff valve between the gauge and the boiler?
To prevent incorrect pressure readings
What is the significance of the pressure gauge indicating the pressure in the boiler at all times?
To ensure the boiler is operating within a safe pressure range
Why is it essential for the pressure gauge to be easily readable?
To enable the operator to quickly respond to pressure changes
What is the primary purpose of ASME BPVC I Part PG-60.6.1?
To ensure the safe operation of steam boilers
What is the primary function of a pigtail siphon in a boiler pressure gauge?
To protect the pressure gauge from steam
Why is it necessary to fill siphons with distilled water prior to installation?
To protect the pressure-sensing device from steam
What is the minimum size of a syphon required by ASME BPVC I Part PG-60.6.1?
¼ in. (6 mm) inside diameter
What is the purpose of a master test pressure gauge?
To verify the accuracy of the boiler pressure gauge
What is the requirement for the connection to the boiler, except the syphon, according to ASME BPVC I Part PG-60.6.1?
NPS ¼ (DN 8)
What is the purpose of a valve connection according to ASME BPVC I Part PG-60.6.3?
To connect the test gauge to the boiler
Why is it necessary to protect the pressure gauge from steam?
To prevent damage to the gauge from high temperature and high pressure steam
What is the requirement for the piping arrangement according to ASME BPVC I Part PG-60.6.1?
Tees, cross-tees, and plugs
What is the purpose of a fined siphon?
To build condensate in a small internal reservoir
What is the requirement for the piping arrangement according to ASME BPVC IV Part HG-602?
A siphon or equivalent device that will develop and maintain a water seal
HARD What is the primary reason why a boiler is more likely to explode when it is nearing the end of its useful service life?
Age-related material degradation
What is the consequence of not connecting the pressure gauge to the steam space or water column?
The pressure indication will be affected by the boiler's hydrostatic head
What is the primary purpose of the shutoff valve adjacent to the pressure gauge?
To isolate the pressure gauge for maintenance
Why is it important to have the pressure gauge easily readable?
To enable the operator to monitor the boiler's pressure from a distance
What is the consequence of not graduating the pressure gauge dial to approximately double the pressure at which the safety valve is set?
The operator will not be able to tell if the boiler is at its normal operating pressure
What is the purpose of ASME BPVC I Part PG-60.6.1?
To ensure the safe operation of steam boilers
Why is it important to calibrate the pressure gauge to approximately double the safety valve setting?
To enable the operator to tell if the boiler is at its normal operating pressure
What is the consequence of installing another shutoff valve between the pressure gauge and the boiler?
The pressure gauge will be less accurate
What is the main purpose of a siphon in a boiler pressure gauge?
To protect the pressure gauge from steam
What is the minimum size of a syphon required by ASME BPVC I Part PG-60.6.1?
¼ in. (6 mm) inside diameter
What is the purpose of a master test pressure gauge?
To verify the accuracy of the boiler pressure gauge
What is the requirement for the connection to the boiler, except the syphon, according to ASME BPVC I Part PG-60.6.1?
Not less than NPS ¼ (DN 8)
What is the function of a fined siphon?
To build condensate in a small internal reservoir to protect the pressure gauge
Why is it necessary to fill siphons with distilled water prior to installation?
To protect the pressure-sensing device from steam
What is the requirement for the piping arrangement according to ASME BPVC I Part PG-60.6.1?
Equipped with tees, cross-tees, and plugs
What is the purpose of a valve connection according to ASME BPVC I Part PG-60.6.3?
To connect the test gauge when the boiler is in service
What is the requirement for the piping arrangement according to ASME BPVC IV Part HG-602?
The gauge or piping to the gauge shall contain a siphon or equivalent device
What is the primary purpose of ASME BPVC I Part PG-60.6.1?
To specify the requirements for the piping arrangement
Match the following ASME BPVC I Part PG-60.6.1 requirements with their descriptions:
Graduation of the pressure gauge dial = To approximately double the safety valve setting Location of the pressure gauge = So that it is easily readable Shutoff valve adjacent to the gauge = To allow for maintenance and repairs Connection of the pressure gauge = To the steam space or water column
Match the following benefits with their descriptions:
Calibrating the pressure gauge to double the safety valve setting = The operator can tell at a distance if the boiler is at its normal operating pressure Having the pressure gauge read at mid-span = It is most accurate at this point Connecting the pressure gauge to the steam space or water column = It reduces the likelihood of blockage in the piping connection Having a shutoff valve adjacent to the gauge = It allows for maintenance and repairs
Match the following consequences with their descriptions:
Not graduating the pressure gauge dial to approximately double the safety valve setting = The operator may not be able to tell if the boiler is at its normal operating pressure Not connecting the pressure gauge to the steam space or water column = The pressure indication may be affected by the boiler's hydrostatic head Installing another shutoff valve between the pressure gauge and the boiler = It may prevent the pressure gauge from functioning properly Not having a shutoff valve adjacent to the gauge = It may make maintenance and repairs difficult
Match the following purposes with their descriptions:
ASME BPVC I Part PG-60.6.1 = To ensure the safe operation of steam boilers The pressure gauge = To indicate the boiler's internal pressure The shutoff valve adjacent to the gauge = To allow for maintenance and repairs The siphon = To protect the pressure gauge from steam
Match the following reasons with their descriptions:
Boiler explosions = Can be caused by excessive internal pressure Regular maintenance = Is essential to prevent boiler failures Connecting the pressure gauge to the steam space or water column = Reduces the likelihood of blockage in the piping connection Calibrating the pressure gauge to double the safety valve setting = Allows the operator to easily read the pressure
Match the following requirements with their descriptions:
Connection to the boiler, except the syphon = Must be according to ASME BPVC I Part PG-60.6.1 Minimum size of a syphon = Is specified by ASME BPVC I Part PG-60.6.1 Piping arrangement = Must be according to ASME BPVC I Part PG-60.6.1 Valve connection = Must be according to ASME BPVC I Part PG-60.6.3
Match the following types of siphons with their descriptions:
Pigtail siphon = Has a coiled tube that protects the pressure gauge from steam Fined siphon = Has a series of small tubes that protects the pressure gauge from steam Siphon = Protects the pressure gauge from steam and sediment Master test pressure gauge = Used to calibrate other pressure gauges
Match the following importance with their descriptions:
Easily readable pressure gauge = Essential for safe boiler operation Accurate pressure gauge = Essential for safe boiler operation Regular maintenance = Essential to prevent boiler failures Shutoff valve adjacent to the gauge = Allows for maintenance and repairs
Match the ASME BPVC codes with their corresponding requirements for boiler pressure gauges:
ASME BPVC I Part PG-60.6.1 = The minimum size of a syphon shall be ¼ in.(6 mm) inside diameter ASME BPVC I Part PG-60.6.3 = Each boiler shall be provided with a valve connection at least NPS ¼ (DN 8) for the exclusive purpose of attaching a test gauge ASME BPVC IV Part HG-602 = The gauge or piping to the gauge shall contain a siphon or equivalent device that will develop and maintain a water seal
Match the types of siphons with their characteristics:
Pigtail siphon = A piping arrangement that traps condensate in its lower parts Fined siphon = A piping arrangement that prevents steam from entering the gauge tube
Match the purposes of the piping arrangement with their corresponding functions:
To prevent steam from entering the gauge tube = To develop and maintain a water seal To permit the pressure to be transmitted to the gauge = To keep steam away from the pressure-sensing device To inspect and clean the pressure piping on a regular basis = To trap condensate in its lower parts To protect the pressure gauge from the action of high pressure and high temperature steam = To ensure the siphon or the equivalent device does not plug off
Match the reasons for protecting the pressure gauge with their corresponding effects:
To prevent steam from entering the gauge tube = To reduce the elasticity of the Bourdon tube To protect the pressure-sensing device = To weaken the brazed joints To ensure the accuracy of the gauge = To reduce the service life of the gauge To prevent the damaging effects of steam = To develop and maintain a water seal
Match the functions of the valve connection with their corresponding purposes:
To attach a test gauge when the boiler is in service = To ascertain the accuracy of the boiler pressure gauge To shut off the pressure gauge from the boiler = To permit the pressure to be transmitted to the gauge To connect the pressure gauge to the steam space or water column = To protect the pressure gauge from steam To inspect and clean the pressure piping on a regular basis = To ensure the siphon or the equivalent device does not plug off
Match the characteristics of the siphon with their corresponding purposes:
A liquid seal = To prevent steam from entering the gauge tube A piping arrangement that traps condensate = To keep steam away from the pressure-sensing device A small internal reservoir = To protect the pressure gauge from the action of high pressure and high temperature steam A spiral pattern or a “U” shape = To develop and maintain a water seal
Match the requirements for the piping arrangement with their corresponding codes:
The piping shall be so arranged that the gauge cannot be shut off from the boiler except by a cock = ASME BPVC IV Part HG-602 The connections to the boiler, except the syphon, shall not be less than NPS ¼ (DN 8) = ASME BPVC I Part PG-60.6.1 The piping shall be equipped with tees, cross-tees, and plugs = ASME BPVC I Part PG-60.6.1 The minimum size of a syphon shall be ¼ in.(6 mm) inside diameter = ASME BPVC I Part PG-60.6.3
Match the purposes of the master test pressure gauge with their corresponding functions:
To verify the accuracy of the boiler pressure gauge = To ascertain the pressure shown on the boiler gauge To connect the pressure gauge to the steam space or water column = To protect the pressure gauge from steam To inspect and clean the pressure piping on a regular basis = To ensure the siphon or the equivalent device does not plug off To attach a test gauge when the boiler is in service = To permit the pressure to be transmitted to the gauge
Match the reasons for using distilled water in siphons with their corresponding effects:
To prevent steam from entering the gauge tube = To reduce the elasticity of the Bourdon tube To protect the pressure-sensing device = To weaken the brazed joints To ensure the accuracy of the gauge = To reduce the service life of the gauge To prevent the damaging effects of steam = To develop and maintain a water seal
Match the purposes of the shutoff valve with their corresponding functions:
To shut off the pressure gauge from the boiler = To permit the pressure to be transmitted to the gauge To connect the pressure gauge to the steam space or water column = To protect the pressure gauge from steam To attach a test gauge when the boiler is in service = To ascertain the accuracy of the boiler pressure gauge To inspect and clean the pressure piping on a regular basis = To ensure the siphon or the equivalent device does not plug off
Study Notes
Boiler Safety and Pressure Gauges
- Boilers are designed to withstand a certain amount of internal pressure, but excessive pressure can cause a pressure vessel explosion, especially in poorly maintained or old boilers.
Importance of Pressure Gauges
- Each steam boiler must be equipped with an accurate pressure gauge to indicate the boiler's internal pressure.
- The pressure gauge is essential for safe boiler operation, allowing operators to monitor pressure from a distance.
ASME BPVC I Part PG-60.6.1 Requirements
- The pressure gauge must be easily readable and indicate the boiler's pressure at all times.
- The dial of the pressure gauge must be graduated to approximately double the pressure at which the safety valve is set, but not less than 1 ½ times this pressure.
- The gauge connection must be connected to the steam space or to the water column or its steam connection to prevent blockage and ensure accurate readings.
Protection of Pressure Gauges
- Steam can reduce the elasticity of the Bourdon tube and weaken its brazed joints, affecting the accuracy of the gauge and reducing its service life.
- A syphon or equivalent device must be used to develop and maintain a water seal that prevents steam from entering the gauge tube.
Installation Requirements
- The connections to the boiler, except the syphon, must not be less than NPS ¼ (DN 8), and ½ in. (13 mm) inside diameter if steel or wrought iron pipe or tubing is used.
- The minimum size of a syphon, if used, must be ¼ in. (6 mm) inside diameter.
ASME BPVC I Part PG-60.6.3 Requirements
- A valve connection at least NPS ¼ (DN 8) is required for attaching a test gauge to verify the accuracy of the boiler pressure gauge.
Pigtail Siphons
- Pigtail siphons are liquid seals that prevent steam from entering the gauge tube by trapping condensate in the lower portion.
- Siphons should be filled with distilled water prior to installation to protect the pressure-sensing device.
Low-Pressure Steam Heating Boilers
- ASME BPVC IV Part HG-602 states the requirements for pressure gauges used on low-pressure steam heating boilers.
- The gauge or piping to the gauge must contain a siphon or equivalent device that develops and maintains a water seal that prevents steam from entering the gauge tube.
Boiler Safety and Pressure Gauges
- Boilers are designed to withstand a certain amount of internal pressure, but excessive pressure can cause a pressure vessel explosion, especially in poorly maintained or old boilers.
Importance of Pressure Gauges
- Each steam boiler must be equipped with an accurate pressure gauge to indicate the boiler's internal pressure.
- The pressure gauge is essential for safe boiler operation, allowing operators to monitor pressure from a distance.
ASME BPVC I Part PG-60.6.1 Requirements
- The pressure gauge must be easily readable and indicate the boiler's pressure at all times.
- The dial of the pressure gauge must be graduated to approximately double the pressure at which the safety valve is set, but not less than 1 ½ times this pressure.
- The gauge connection must be connected to the steam space or to the water column or its steam connection to prevent blockage and ensure accurate readings.
Protection of Pressure Gauges
- Steam can reduce the elasticity of the Bourdon tube and weaken its brazed joints, affecting the accuracy of the gauge and reducing its service life.
- A syphon or equivalent device must be used to develop and maintain a water seal that prevents steam from entering the gauge tube.
Installation Requirements
- The connections to the boiler, except the syphon, must not be less than NPS ¼ (DN 8), and ½ in. (13 mm) inside diameter if steel or wrought iron pipe or tubing is used.
- The minimum size of a syphon, if used, must be ¼ in. (6 mm) inside diameter.
ASME BPVC I Part PG-60.6.3 Requirements
- A valve connection at least NPS ¼ (DN 8) is required for attaching a test gauge to verify the accuracy of the boiler pressure gauge.
Pigtail Siphons
- Pigtail siphons are liquid seals that prevent steam from entering the gauge tube by trapping condensate in the lower portion.
- Siphons should be filled with distilled water prior to installation to protect the pressure-sensing device.
Low-Pressure Steam Heating Boilers
- ASME BPVC IV Part HG-602 states the requirements for pressure gauges used on low-pressure steam heating boilers.
- The gauge or piping to the gauge must contain a siphon or equivalent device that develops and maintains a water seal that prevents steam from entering the gauge tube.
Boiler Safety and Pressure Gauges
- Boilers are designed to withstand a certain amount of internal pressure, but excessive pressure can cause a pressure vessel explosion, especially in poorly maintained or old boilers.
Importance of Pressure Gauges
- Each steam boiler must be equipped with an accurate pressure gauge to indicate the boiler's internal pressure.
- The pressure gauge is essential for safe boiler operation, allowing operators to monitor pressure from a distance.
ASME BPVC I Part PG-60.6.1 Requirements
- The pressure gauge must be easily readable and indicate the boiler's pressure at all times.
- The dial of the pressure gauge must be graduated to approximately double the pressure at which the safety valve is set, but not less than 1 ½ times this pressure.
- The gauge connection must be connected to the steam space or to the water column or its steam connection to prevent blockage and ensure accurate readings.
Protection of Pressure Gauges
- Steam can reduce the elasticity of the Bourdon tube and weaken its brazed joints, affecting the accuracy of the gauge and reducing its service life.
- A syphon or equivalent device must be used to develop and maintain a water seal that prevents steam from entering the gauge tube.
Installation Requirements
- The connections to the boiler, except the syphon, must not be less than NPS ¼ (DN 8), and ½ in. (13 mm) inside diameter if steel or wrought iron pipe or tubing is used.
- The minimum size of a syphon, if used, must be ¼ in. (6 mm) inside diameter.
ASME BPVC I Part PG-60.6.3 Requirements
- A valve connection at least NPS ¼ (DN 8) is required for attaching a test gauge to verify the accuracy of the boiler pressure gauge.
Pigtail Siphons
- Pigtail siphons are liquid seals that prevent steam from entering the gauge tube by trapping condensate in the lower portion.
- Siphons should be filled with distilled water prior to installation to protect the pressure-sensing device.
Low-Pressure Steam Heating Boilers
- ASME BPVC IV Part HG-602 states the requirements for pressure gauges used on low-pressure steam heating boilers.
- The gauge or piping to the gauge must contain a siphon or equivalent device that develops and maintains a water seal that prevents steam from entering the gauge tube.
Boiler Safety and Pressure Gauges
- Boilers are designed to withstand a certain amount of internal pressure, but excessive pressure can cause a pressure vessel explosion, especially in poorly maintained or old boilers.
Importance of Pressure Gauges
- Each steam boiler must be equipped with an accurate pressure gauge to indicate the boiler's internal pressure.
- The pressure gauge is essential for safe boiler operation, allowing operators to monitor pressure from a distance.
ASME BPVC I Part PG-60.6.1 Requirements
- The pressure gauge must be easily readable and indicate the boiler's pressure at all times.
- The dial of the pressure gauge must be graduated to approximately double the pressure at which the safety valve is set, but not less than 1 ½ times this pressure.
- The gauge connection must be connected to the steam space or to the water column or its steam connection to prevent blockage and ensure accurate readings.
Protection of Pressure Gauges
- Steam can reduce the elasticity of the Bourdon tube and weaken its brazed joints, affecting the accuracy of the gauge and reducing its service life.
- A syphon or equivalent device must be used to develop and maintain a water seal that prevents steam from entering the gauge tube.
Installation Requirements
- The connections to the boiler, except the syphon, must not be less than NPS ¼ (DN 8), and ½ in. (13 mm) inside diameter if steel or wrought iron pipe or tubing is used.
- The minimum size of a syphon, if used, must be ¼ in. (6 mm) inside diameter.
ASME BPVC I Part PG-60.6.3 Requirements
- A valve connection at least NPS ¼ (DN 8) is required for attaching a test gauge to verify the accuracy of the boiler pressure gauge.
Pigtail Siphons
- Pigtail siphons are liquid seals that prevent steam from entering the gauge tube by trapping condensate in the lower portion.
- Siphons should be filled with distilled water prior to installation to protect the pressure-sensing device.
Low-Pressure Steam Heating Boilers
- ASME BPVC IV Part HG-602 states the requirements for pressure gauges used on low-pressure steam heating boilers.
- The gauge or piping to the gauge must contain a siphon or equivalent device that develops and maintains a water seal that prevents steam from entering the gauge tube.
Learn about the importance of accurate pressure gauges in steam boilers, as per ASME BPVC I Part PG-60.6.1, to ensure safe operation and prevent explosions. Understand the role of bourdon tube gauges in measuring internal pressure.
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