4BE3.5 U3 C4 Obj 3 EMH

<p>When a boiler has a manhole opening</p> Signup and view all the answers

<p>Outside screw and yoke, rising stem valve</p> Signup and view all the answers

<p>To show whether the valve is open or closed</p> Signup and view all the answers

<p>ASME BPVC I</p> Signup and view all the answers

<p>To provide a drainage path between valves</p> Signup and view all the answers

<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

<p>The inlet shall be under the disk of the valve</p> Signup and view all the answers

<p>Each arrangement shall be equipped as required by these rules</p> Signup and view all the answers

<p>Two slow-opening blowoff valves</p> Signup and view all the answers

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

<p>Cast steel Class 300</p> Signup and view all the answers

<p>Miscellaneous piping, such as water level indicators, water columns, gauge cocks, and pressure gauges</p> Signup and view all the answers

<p>To direct the steam to the various parts of the system</p> Signup and view all the answers

<p>One slow-opening blowoff valve</p> Signup and view all the answers

<p>To isolate the feedwater line for maintenance and repair</p> Signup and view all the answers

<p>At least equal to the pressure stamped on the boiler</p> Signup and view all the answers

<p>To reduce thermal shock</p> Signup and view all the answers

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

<p>To provide a visual indication of the valve's position</p> Signup and view all the answers

<p>At a point within the boiler where water does not discharge against hot surfaces</p> Signup and view all the answers

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

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

<p>To prevent the boiler water level from dropping below the lowest permissible level</p> Signup and view all the answers

<p>Either swing or lift check valves</p> Signup and view all the answers

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

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

<p>At the bottom of the shell close to the back end</p> Signup and view all the answers

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

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

<p>20 (3/4)</p> Signup and view all the answers

<p>At the lowest point of each water leg</p> Signup and view all the answers

<p>One stop valve is required</p> Signup and view all the answers

<p>Because they offer the least resistance</p> Signup and view all the answers

<p>To introduce water into the boiler</p> Signup and view all the answers

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

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

<p>Outside screw and yoke valve with rising spindle</p> Signup and view all the answers

<p>It should be provided with a check valve</p> Signup and view all the answers

<p>To prevent boiler pressure from lowering the boiler water level</p> Signup and view all the answers

<p>At least equal to the boiler maximum allowable working pressure</p> Signup and view all the answers

<p>Swing or lift check valves</p> Signup and view all the answers

<p>To connect external piping and fittings</p> Signup and view all the answers

<p>Outside screw and yoke, rising stem valve</p> Signup and view all the answers

<p>To isolate boilers connected to a common header</p> Signup and view all the answers

<p>Both ASME B31.1 and ASME BPVC I</p> Signup and view all the answers

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

<p>To provide ample drainage between stop valves</p> Signup and view all the answers

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

<p>A block and bleed valve system</p> Signup and view all the answers

<p>To indicate valve position from a distance</p> Signup and view all the answers

<p>20 (3/4)</p> Signup and view all the answers

<p>At the bottom of the shell close to the back end</p> Signup and view all the answers

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

<p>At the lowest point of each water leg</p> Signup and view all the answers

<p>To remove sediment from the water column, gauge glass, and low water fuel cutoff</p> Signup and view all the answers

<p>To permit isolation of the feedwater line for maintenance and repair without draining the boiler.</p> Signup and view all the answers

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

<p>Two slow-opening valves</p> Signup and view all the answers

<p>Y-type globe valve</p> Signup and view all the answers

<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

<p>Each feed arrangement shall be equipped as required by ASME B31.1 Power Piping Code Part 122.1.7.</p> Signup and view all the answers

<p>One valve, which may be either slow-opening or quick-opening</p> Signup and view all the answers

<p>At least cast steel Class 300</p> Signup and view all the answers

<p>Miscellaneous piping, such as water level indicators, water columns, gauge cocks, and pressure gauges.</p> Signup and view all the answers

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

<p>40 (1 ½) DN</p> Signup and view all the answers

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

<p>At the lowest point of each water leg</p> Signup and view all the answers

<p>To remove sediment from the water column, gauge glass, and low water fuel cutoff</p> Signup and view all the answers

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

<p>20 (3/4) DN</p> Signup and view all the answers

<p>To meet ASME B31.1 Power Piping Code requirements</p> Signup and view all the answers

<p>Outside screw and yoke, rising stem valves</p> Signup and view all the answers

<p>To prevent water accumulation in the steam line</p> Signup and view all the answers

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

<p>ASME B31.1 Power Piping Code</p> Signup and view all the answers

<p>Outside screw and yoke, rising stem valves</p> Signup and view all the answers

<p>To isolate a boiler from the common steam header</p> Signup and view all the answers

<p>ASME BPVC I</p> Signup and view all the answers

<p>To provide independent feedwater control to each boiler</p> Signup and view all the answers

<p>One blowoff valve of either slow-opening or quick-opening type is required</p> Signup and view all the answers

<p>To permit isolation of the feedwater line for maintenance and repair without draining the boiler</p> Signup and view all the answers

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

<p>Class 250 bronze, cast iron, ductile iron, or steel</p> Signup and view all the answers

<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

<p>The inlet shall be under the disk of the valve</p> Signup and view all the answers

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

<p>Feedwater piping for all boilers</p> Signup and view all the answers

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

<p>Each duplicate feed arrangement shall be equipped as required by these rules</p> Signup and view all the answers

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

<p>To prevent thermal shock in the blowoff line</p> Signup and view all the answers

<p>To prevent boiler pressure from lowering the boiler water level</p> Signup and view all the answers

<p>One stop valve shall be used in the supply pipe connection</p> Signup and view all the answers

<p>To ensure the boiler can be completely drained</p> Signup and view all the answers

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

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

<p>Outside screw and yoke valve with rising spindle</p> Signup and view all the answers

<p>To introduce feedwater into the boiler</p> Signup and view all the answers

<p>Up to 225 kg/hr = 20 (3/4) 225 to 550 kg/hr = 25 (1) 550 to 1200 kg/hr = 32 (1 ¼) 1200 to 2700 kg/hr = 40 (1 ½)</p> Signup and view all the answers

<p>Packaged firetube boilers = At the bottom of the shell close to the back end Boilers with water legs = At the lowest point of each water leg Electric steam boilers = At the bottom of the boiler drum Low-pressure steam boilers = At the top of the boiler shell</p> Signup and view all the answers

<p>Blowoff valves = 200 kPa (30 psi) and 120°C (250°F) Globe valves = 150 kPa (20 psi) and 100°C (212°F) Gate valves = 250 kPa (35 psi) and 150°C (302°F) Check valves = 100 kPa (15 psi) and 80°C (176°F)</p> Signup and view all the answers

<p>Blowdown valves = Testing and intermittent removal of sediment Blowoff valves = Draining low-pressure steam boilers Globe valves = Isolation or regulation in feedwater piping Check valves = Preventing backflow in feedwater piping</p> Signup and view all the answers

<p>Low-pressure steam boilers = 200 kPa (30 psi) High-pressure steam boilers = 400 kPa (60 psi) Electric steam boilers = 150 kPa (20 psi) Firetube boilers = 250 kPa (35 psi)</p> Signup and view all the answers

<p>Blowoff valves = Not less than 120°C (250°F) Globe valves = Not less than 100°C (212°F) Gate valves = Not less than 150°C (302°F) Check valves = Not less than 80°C (176°F)</p> Signup and view all the answers

<p>Safety valve = Releases excess steam to prevent boiler overpressure Main steam stop valve = Stops steam flow for maintenance or repairs Drum vent = Venting air or gases from the boiler drum Feedwater inlet = Supplies feedwater to the boiler</p> Signup and view all the answers

<p>ASME B31.1 Power Piping Code = Governs boiler external piping ASME BPVC I = Provides direction on boiler piping systems ASME BPVC IV = Provides requirements for feedwater piping and fittings ASME B31.1 Part 122.1.7 = Specifies requirements for block and bleed valves in steam lines</p> Signup and view all the answers

<p>Outside screw and yoke valve = Steam shut-off valves Gate valve = Isolation or regulation in feedwater piping Globe valve = Blowoff service in low-pressure steam boilers Check valve = Feedwater piping to prevent backflow</p> Signup and view all the answers

<p>Blowoff connection = Typically located at the bottom of packaged firetube boilers Feedwater connection = Usually located on the side or top of the boiler drum Steam outlet = Connected to a common steam header Drum vent = Located on top of the boiler drum</p> Signup and view all the answers

<p>Free-blow drain = Allows for easy cleaning and maintenance of steam lines Block and bleed valve = Provides isolation and venting in steam lines Stop valve = Stops steam flow for maintenance or repairs Check valve = Prevents backflow in feedwater piping</p> Signup and view all the answers

<p>HG-705(a) = Feedwater pipe size and arrangement requirements HG-710.4(b) = Temperature and pressure ratings for stop valves HG-715 = Blowoff piping and valve sizing for boilers up to 225 kg/hr HG-716 = Requirements for boiler external piping and fittings</p> Signup and view all the answers

<p>Continuous blowdown = Removes impurities and sediment from the boiler water Surface blowoff = Cleans the boiler water surface of impurities Bottom blowoff = Removes sediment and impurities from the boiler bottom Chemical feed = Adds chemicals for water treatment and corrosion prevention</p> Signup and view all the answers

<p>Fittings and piping = Welded directly to the drum or shell Threaded fittings = Screwed directly into the drum or shell Flanged connections = Attached to the boiler with bolts and gaskets Outlet connections = Connected to the boiler with piping and fittings</p> Signup and view all the answers

<p>Check valve = Prevents the boiler from draining through the feedwater line when a boiler feedwater pump is not running Stop valve = Permits isolation of the feedwater line for maintenance and repair without draining the boiler Globe valve = Used for isolation or regulation with the inlet under the disk of the valve Regulating valve = Located between the check valve and the source of supply in a common feedwater pump system</p> Signup and view all the answers

<p>Slow-opening valve = Requires at least five 360-degree turns of the operating mechanism to change from fully closed to fully opened Quick-opening valve = Used in boilers with allowable working pressures over 100 psig Y-type globe valve = Required for blowoff service due to not trapping sediment Cast steel Class 300 valve = Required for blowoff valves when the boiler MAWP is greater than 1725 kPa</p> Signup and view all the answers

<p>Electric steam boilers = Normal water content of 380 L (100 US gallons) or less Traction boilers = In traction service, including those used in steam traction engines and steam locomotives Portable steam boilers = Used for temporary or emergency applications Industrial boilers = No exemption from the two-valve rule</p> Signup and view all the answers

<p>Feedwater piping = Requires a check valve and a stop valve between the check valve and the boiler Blowoff piping = Requires two slow-opening blowoff valves or one quick-opening valve followed by a slow-opening valve Miscellaneous piping = Covers water level indicators, water columns, gauge cocks, and pressure gauges Steam piping = Requires a stop valve and a check valve in the steam line</p> Signup and view all the answers

<p>Globe valve = Has dams or pockets where sediment can collect Y-type globe valve = Does not trap sediment Ordinary globe valve = Prohibited from blowoff service Regulating valve = Used for controlling the flow rate of feedwater</p> Signup and view all the answers

<p>Boilers with MAWP over 1725 kPa = Requires cast steel Class 300 blowoff valves Boilers with MAWP less than 1725 kPa = Allows Class 250 bronze, cast iron, ductile iron, or steel blowoff valves Electric steam boilers = Requires one slow-opening blowoff valve Traction boilers = Requires one slow-opening or quick-opening blowoff valve</p> Signup and view all the answers

<p>Steam outlet stop valve = Allows the steam to leave the boiler and flow through the main header Feedwater inlet stop and check valves = Regulates the water level in the boiler Blowoff valves = Removes sediment that accumulates at the lowest water space Vent valve = Allows air to enter the boiler during startup</p> Signup and view all the answers

<p>Check valve = Prevents the boiler from draining through the feedwater line when a boiler feedwater pump is not running Stop valve = Permits isolation of the feedwater line for maintenance and repair without draining the boiler Globe valve = Used for isolation or regulation in feedwater piping Blowoff valve = Reduces thermal shock during boiler startup</p> Signup and view all the answers

<p>ASME B31.1 Power Piping Code Part 122.1.7 = Covers feedwater piping and blowoff piping requirements ASME BPVC IV Part HG-710.4(b) = Covers requirements for stop valves ASME B31.1 Part 122.1.6 = Covers miscellaneous piping requirements ASME BPVC IV Part HG-705(a) = Covers requirements for feedwater piping and connections</p> Signup and view all the answers

<p>Gate valve = Least resistance, wide open during operation Globe valve = Used for throttling Swing check valve = Prevents backflow in the feedwater line Outside screw and yoke valve = Recommended for steam outlets DN 50 (2” NPS) or larger</p> Signup and view all the answers

<p>HG-710.1 = Stop valve requirements for single steam boiler installations HG-710.3 = Stop valve requirements for multiple steam boiler installations HG-703.2 = Return (or Hartford) loop requirement HG-715(a) = Bottom blowoff connection requirement</p> Signup and view all the answers

<p>Globe valve = Used for isolation or regulation in feedwater piping Y-type globe valve = Used for blowoff service Regulating valve = Used for controlling the flow rate of feedwater Stop valve = Used for isolating the feedwater line for maintenance and repair</p> Signup and view all the answers

<p>Feedwater connection = Directs water into the boiler Steam outlet connection = Allows steam to leave the boiler Blowoff connection = Removes sediment and water from the boiler Vent connection = Allows air to enter the boiler during startup</p> Signup and view all the answers

<p>Single boiler system = Requires a check valve and a stop valve between the check valve and the boiler Multiple boiler system = Requires a globe or regulating valve in the branch to each boiler Boilers with duplicate feed arrangements = Requires each arrangement to be equipped with a check valve and a stop valve Portable steam boilers = Requires only one blowoff valve</p> Signup and view all the answers

<p>Check valve = Prevents backflow in the feedwater line Stop valve = Isolates the feedwater system for repairs Globe valve = Used for throttling Gate valve = Preferred for steam outlet due to least resistance</p> Signup and view all the answers

<p>Water level indicators = Display the boiler water level Pressure limit controls = Regulate the boiler pressure Low water fuel cut-off = Shuts off the boiler if water level is too low Pressure gauge = Displays the boiler pressure</p> Signup and view all the answers

<p>Feedwater pipe = Provided with a check valve near the boiler Steam outlet pipe = Has a minimum pressure rating equal to the boiler's Blowoff pipe = Connected to the lowest water space practicable Vent pipe = Allows air to enter the boiler during startup</p> Signup and view all the answers

<p>Lift check valve = Used in the feedwater line to prevent backflow Swing check valve = Used in the feedwater line to prevent backflow Gate valve = Preferred for steam outlet due to least resistance Globe valve = Used for throttling</p> Signup and view all the answers

<p>Steam outlet stop valve = Regulates the steam flow out of the boiler Feedwater inlet stop and check valves = Regulates the water level in the boiler Blowoff valves = Removes sediment and water from the boiler Vent valve = Allows air to enter the boiler during startup</p> Signup and view all the answers

<p>ASME BPVC IV Part HG-710.1 = Stopped valve requirements for single steam boiler installations ASME BPVC IV Part HG-703.2 = Return (or Hartford) loop requirement ASME BPVC IV Part HG-715(a) = Bottom blowoff connection requirement ASME BPVC IV Part HG-705(a) = Feedwater connection requirement</p> Signup and view all the answers