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4BE3.5 US C4 Obj3 MEDIUM
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4BE3.5 US C4 Obj3 MEDIUM

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Questions and Answers

What are boiler outlet connections?

  • Connections for electrical wiring in a boiler drum
  • Connections for fuel supply to the boiler
  • Connections for air ventilation in the boiler
  • Tapings in a boiler drum or shell for connecting external piping and fittings (correct)

    • According to ASME B 31.1, which piping falls under its technical jurisdiction?

  • Piping for electrical connections
  • Piping for air ventilation
  • Boiler external piping up to the first or second valve (correct)
  • Boiler internal piping

    • What are the requirements specified by ASME B31.1 when multiple boilers are connected to a common header?

  • Each boiler should have a single stop valve with a drain
  • Each boiler should have three stop valves connected
  • Each boiler with a manhole opening should be fitted with two stop valves having an ample free-blow drain between them (correct)
  • Each boiler should have a single stop valve without a drain

    • What is the purpose of the boiler outlet connections?

    <p>To connect the boiler to various controls, instruments, or fittings</p> Signup and view all the answers

    Which type of boiler requires a manhole for inspections and maintenance?

    <p>Boiler #2</p> Signup and view all the answers

    What is required for the required steam shut-off valves in the steam line according to ASME BPVC I?

    <p>Position indicator</p> Signup and view all the answers

    Which type of boilers require two slow-opening blowoff valves if the allowable working pressure is over 100 psig?

    <p>Forced circulation boilers</p> Signup and view all the answers

    What is required in the feedwater line to a boiler according to ASME B31.1?

    <p>Check valve and stop valve</p> Signup and view all the answers

    What must be present in the branch to each boiler when multiple boilers are fed from a common source?

    <p>Globe or regulating valve</p> Signup and view all the answers

    Which type of valves are commonly used on the steam outlet of a boiler?

    <p>Gate valves and globe valves</p> Signup and view all the answers

    According to ASME BPVC IV Part HG-705(a), where should the feedwater not be introduced?

    <p>Through openings provided for inspection or cleaning</p> Signup and view all the answers

    What is the purpose of the check valve in the feedwater line according to ASME BPVC IV Part HG-705(a)?

    <p>Prevent boiler draining when the feedwater pump is off</p> Signup and view all the answers

    Why should bottom blowoff connections be connected to the lowest water space according to ASME BPVC IV Part HG-715(a)?

    <p>To completely drain the boiler</p> Signup and view all the answers

    What is the purpose of blowdown valves in low-pressure steam boilers?

    <p>Testing and intermittent removal of sediment from water column</p> Signup and view all the answers

    Why is it recommended to use outside screw and yoke valves with rising spindles for a DN 50 (2” NPS) or larger steam outlet?

    <p>To enable the operator to see whether the valve is open or closed from a distance</p> Signup and view all the answers

    What is the minimum pressure rating required for valves used to blowoff or drain low-pressure steam boilers according to ASME BPVC IV Part HG-715(a)?

    <p>$200 kPa (30 psi)$</p> Signup and view all the answers

    According to ASME BPVC IV Part HG-703.2, what does the return (or Hartford) loop prevent?

    <p>Boiler pressure from lowering the water level below the lowest permissible level</p> Signup and view all the answers

    What is the purpose of a stop valve or cock installed upstream or downstream of the check valve in pumped return systems?

    <p>$Allows isolation of feedwater system components for repairs without draining the boiler$</p> Signup and view all the answers

    According to ASME B31.1, which piping falls under its technical jurisdiction?

    <p>Boiler external piping</p> Signup and view all the answers

    What are the requirements for boiler outlet connections?

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

    According to ASME B31.1 122.1.7 (A3), what is required when two or more boilers are connected to a common header?

    <p>Free-blow drain between stop valves</p> Signup and view all the answers

    Why is it often necessary to consult both ASME B31.1 and ASME BPVC I?

    <p>To ensure compliance with multiple regulations</p> Signup and view all the answers

    What is required in the feedwater line to a boiler according to ASME B31.1?

    <p>Check valve and globe valve</p> Signup and view all the answers

    What is the purpose of the check valve in the feedwater line according to ASME BPVC IV Part HG-705(a)?

    <p>To prevent backflow of water</p> Signup and view all the answers

    According to ASME B31.1, what must be present in the branch to each boiler when multiple boilers are fed from a common source?

    <p>Globe or regulating valve</p> Signup and view all the answers

    Why should bottom blowoff connections be connected to the lowest water space according to ASME BPVC IV Part HG-715(a)?

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

    What does the return (or Hartford) loop prevent according to ASME BPVC IV Part HG-703.2?

    <p>Heat loss</p> Signup and view all the answers

    What are the requirements specified by ASME B31.1 when multiple boilers are connected to a common header?

    <p>Installation of globe or regulating valves in steam lines</p> Signup and view all the answers

    According to ASME BPVC IV Part HG-705(a), where should the feedwater not be introduced?

    <p>At the top of the steam drum</p> Signup and view all the answers

    What is the purpose of a stop valve or cock installed upstream or downstream of the check valve in pumped return systems?

    <p>To regulate the flow of feedwater</p> Signup and view all the answers

    What is the purpose of blowdown valves in low-pressure steam boilers?

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

    Which type of valves are commonly used on the steam outlet of a boiler?

    <p>Gate valves and globe valves</p> Signup and view all the answers

    What is required for the required steam shut-off valves in the steam line according to ASME BPVC I?

    <p>Position indicator</p> Signup and view all the answers

    What must be present in the branch to each boiler when multiple boilers are fed from a common source?

    <p>Globe or regulating valve</p> Signup and view all the answers

    What is the minimum pressure rating required for all stop valves according to ASME BPVC IV Part HG-705(b)?

    <p>Equal to the pressure stamped upon the boiler</p> Signup and view all the answers

    What is the recommended valve type for a DN 50 (2” NPS) or larger steam outlet according to the text?

    <p>Outside screw and yoke valves with rising spindles</p> Signup and view all the answers

    According to ASME BPVC IV Part HG-705(a), where should the feedwater not be introduced?

    <p>Through openings provided for inspection or cleaning</p> Signup and view all the answers

    What type of valve shall be installed near the boiler feedwater pipe according to ASME BPVC IV Part HG-705(a)?

    <p>Check valve</p> Signup and view all the answers

    What does the return (or Hartford) loop prevent according to ASME BPVC IV Part HG-703.2?

    <p>Boiler water level from lowering due to boiler pressure</p> Signup and view all the answers

    What is the purpose of bottom blowoff connections according to ASME BPVC IV Part HG-715(a)?

    <p>To ensure complete drainage of the boiler</p> Signup and view all the answers

    According to ASME BPVC IV Part HG-715(a), what is the minimum required safety valve capacity for blowoff piping and valve size of 225 to 550 kg/hr?

    <p>$32 \text{ (1 ¼ inch)}$</p> Signup and view all the answers

    Why are blowdown valves installed in low-pressure steam boilers?

    <p>For testing and removal of sediment from specified components</p> Signup and view all the answers

    Which type of boilers have the blowoff connection at the bottom of each water leg?

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

    What is required for all stop valves in terms of temperature rating according to ASME BPVC IV Part HG-705(b)?

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

    What is recommended for the threaded part of the spindle in outside screw and yoke valves with rising spindles?

    <p>To be easily lubricated</p> Signup and view all the answers

    What is the minimum pressure rating required for valves used to blowoff or drain low-pressure steam boilers according to ASME BPVC IV Part HG-715(a)?

    <p>200 kPa (30 psi)</p> Signup and view all the answers

    Why is it recommended to use outside screw and yoke valves with rising spindles for a DN 50 (2” NPS) or larger steam outlet?

    <p>To enable the operator to visually confirm whether the valve is open or closed</p> Signup and view all the answers

    According to ASME BPVC IV Part HG-705(a), where should the feedwater not be introduced?

    <p>Through blowdown valve connections</p> Signup and view all the answers

    What is the purpose of the check valve in the feedwater line according to ASME BPVC IV Part HG-705(a)?

    <p>To prevent backflow from the boiler</p> Signup and view all the answers

    According to ASME BPVC IV Part HG-703.2, what does the return (or Hartford) loop prevent?

    <p>Low water level in the boiler</p> Signup and view all the answers

    What is the purpose of blowdown valves in low-pressure steam boilers?

    <p>To remove sediments from the water column and gauge glass</p> Signup and view all the answers

    What are the requirements for boiler outlet connections?

    <p>They must be full size to the point of discharge</p> Signup and view all the answers

    Why should bottom blowoff connections be connected to the lowest water space according to ASME BPVC IV Part HG-715(a)?

    <p>To ensure complete drainage and discharge of sediment</p> Signup and view all the answers

    According to ASME B31.1, which piping falls under its technical jurisdiction?

    <p>Steam, water, gas, and air piping</p> Signup and view all the answers

    What must be present in the branch to each boiler when multiple boilers are fed from a common source?

    <p>A shutoff valve, a check valve, and a pressure relief valve</p> Signup and view all the answers

    Study Notes

    • Boiler #1: Small steam drum, only equipped with a handhole.

    • Boiler #2: Larger shell, requires a manhole for inspections and maintenance.

    • Due to connection to a common steam header, Boiler #2 requires block and bleed valves in the steam line.

    • If Boiler #1 had a manhole, it too would need a block and bleed system.

    • Steam Line Stop Valves and Drains (ASME BPVC I): Required steam shut-off valves must be equipped with a position indicator.

    • Feedwater Piping (ASME B31.1): Each feedwater line to a boiler is required to have a check valve and a stop valve.

    • When multiple boilers are fed from a common source, a globe or regulating valve is required in the branch to each boiler.

    • Blowoff Piping (ASME B31.1): Boilers with allowable working pressures over 100 psig (690 kPag) require two slow-opening blowoff valves.

    • Traction and portable boilers, as well as forced circulation and electric steam boilers with a normal water content of 380 L (100 US gallons) or less, require only one blowoff valve.

    • Miscellaneous Piping (ASME B31.1): Various fittings attached to a low-pressure steam boiler include: a steam outlet stop valve, feedwater inlet stop and check valves, blowoff valves, vent valve, and water level controls.

    • Steam Outlet and Stop Valve (ASME BPVC IV): The steam produced in the boiler leaves through the steam outlet, and flows through the main header to the branch lines.

    • Gate valves and globe valves are commonly used on the steam outlet of a boiler.

    • Stop valves are used in the supply and return pipe connections of single and multiple boilers.

    • Boiler #1: Small steam drum, only equipped with a handhole.

    • Boiler #2: Larger shell, requires a manhole for inspections and maintenance.

    • Due to connection to a common steam header, Boiler #2 requires block and bleed valves in the steam line.

    • If Boiler #1 had a manhole, it too would need a block and bleed system.

    • Steam Line Stop Valves and Drains (ASME BPVC I): Required steam shut-off valves must be equipped with a position indicator.

    • Feedwater Piping (ASME B31.1): Each feedwater line to a boiler is required to have a check valve and a stop valve.

    • When multiple boilers are fed from a common source, a globe or regulating valve is required in the branch to each boiler.

    • Blowoff Piping (ASME B31.1): Boilers with allowable working pressures over 100 psig (690 kPag) require two slow-opening blowoff valves.

    • Traction and portable boilers, as well as forced circulation and electric steam boilers with a normal water content of 380 L (100 US gallons) or less, require only one blowoff valve.

    • Miscellaneous Piping (ASME B31.1): Various fittings attached to a low-pressure steam boiler include: a steam outlet stop valve, feedwater inlet stop and check valves, blowoff valves, vent valve, and water level controls.

    • Steam Outlet and Stop Valve (ASME BPVC IV): The steam produced in the boiler leaves through the steam outlet, and flows through the main header to the branch lines.

    • Gate valves and globe valves are commonly used on the steam outlet of a boiler.

    • Stop valves are used in the supply and return pipe connections of single and multiple boilers.

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    Related Documents

    4BE3.4 C4 Obj 3.pdf

    Description

    Test your knowledge of the code requirements for boiler outlet connections and valves on steam boilers. This quiz covers the various tapings in a boiler drum or shell, connecting external piping and fittings to controls, instruments, or fittings such as safety valves, main steam stop valves, water columns, pressure controls, and more.

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