Boiler Valve and Cock Requirements Quiz
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Questions and Answers

What are outlet connections in a boiler used for?

  • Connecting external piping and fittings (correct)
  • Regulating the pressure inside the boiler
  • Improving the efficiency of the safety valve
  • Increasing the temperature of the boiler drum

    • What is the technical jurisdiction of ASME B31.1 Power Piping Code?

  • Boiler external piping (correct)
  • Boiler pressure control
  • Boiler drum design
  • Boiler water treatment

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

  • A single stop valve
  • Two stop valves with an ample free-blow drain between them (correct)
  • Two stop valves without a manhole opening
  • Two stop valves with no free-blow drain

    • What is the purpose of continuous blowdown in a boiler?

    <p>To remove sludge and sediment from the bottom of the boiler</p> Signup and view all the answers

    How are fittings and piping usually attached to a boiler drum or shell?

    <p>By welding directly to the drum or shell</p> Signup and view all the answers

    What falls under the technical jurisdiction of ASME BPVC I regarding boiler piping systems?

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

    According to ASME B31.1 Power Piping Code, what is the purpose of the check valve in the feedwater piping for all boilers?

    <p>To prevent the boiler from draining through the feedwater line when a boiler feedwater pump is not running</p> Signup and view all the answers

    Why are slow-opening blowoff valves required for boilers with allowable working pressures over 100 psig (690 kPag), according to ASME B31.1 Power Piping Code?

    <p>To reduce thermal shock with a gradual, controlled warm-up of the blowoff line</p> Signup and view all the answers

    Which type of valve is prohibited from blowoff service according to ASME B31.1 Power Piping Code?

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

    What is required for all stop valves according to ASME BPVC IV Part HG-710.4(b)?

    <p>Suitable pressure and temperature rating</p> Signup and view all the answers

    According to ASME B31.1 Power Piping Code, which type of valves are preferred for steam shut-off valves in boilers?

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

    What type of boilers are exempt from the two-valve rule for blowoff valves according to ASME B31.1 Power Piping Code?

    <p>Traction and portable boilers</p> Signup and view all the answers

    What is the minimum reading required for the thermometer?

    <p>20°C</p> Signup and view all the answers

    What is the normal operating pressure for the hot water boiler?

    <p>900 kPa</p> Signup and view all the answers

    What type of valves are required in the supply and return pipe connections on all hot water heating boilers?

    <p>Stop valves</p> Signup and view all the answers

    What is the purpose of the expansion tank in a heating system?

    <p>To provide storage space for excess water due to expansion</p> Signup and view all the answers

    Under what conditions are stop valves not required in hot water heating boilers?

    <p>When the system can be drained without draining the boiler</p> Signup and view all the answers

    What is the minimum hydrostatic test pressure required for expansion tanks in systems designed for a working pressure of 200 kPa or less?

    <p>520 kPa</p> Signup and view all the answers

    What are open expansion tanks often limited to?

    <p>Systems with a maximum water temperature of 80°C</p> Signup and view all the answers

    What is the minimum required pressure rating for valves used to blowoff or drain low-pressure steam boilers, according to ASME BPVC IV?

    <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 steam outlet that is DN 50 (2” NPS) or larger?

    <p>To prevent corrosion from steam or water exposure</p> Signup and view all the answers

    Why should the feedwater connection be arranged so that the water does not discharge directly against surfaces exposed to hot combustion gases or radiant heat from the fire?

    <p>To avoid damaging the feedwater connection</p> Signup and view all the answers

    What is the purpose of a check valve near the boiler in pumped return systems?

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

    What is the purpose of a bottom blowoff connection in steam heating boilers, according to ASME BPVC IV?

    <p>To allow for intermittent removal of sediment from the water column and gauge glass</p> Signup and view all the answers

    What is required by ASME BPVC IV on every hot water heating boiler?

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

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