4BE3.5 U3 C3 Obj 2 EMH

<p>To bypass the low water cut-off control during blowdown</p> Signup and view all the answers

<p>One low-water fuel cut-off device</p> Signup and view all the answers

<p>Because it requires draining significant amounts of water from the system</p> Signup and view all the answers

<p>It has negative consequences for plant operations</p> Signup and view all the answers

<p>Maintain pressure on the bypass switch</p> Signup and view all the answers

<p>Extremely hazardous</p> Signup and view all the answers

<p>Part HG-606</p> Signup and view all the answers

<p>400,000 Btu/hr</p> Signup and view all the answers

<p>To automatically cut off the fuel supply when the circulating flow is interrupted</p> Signup and view all the answers

<p>A means of testing the operation without resorting to draining the entire system</p> Signup and view all the answers

<p>Automatically fired boilers with capacities up to 300 boiler horsepower</p> Signup and view all the answers

<p>Two</p> Signup and view all the answers

<p>To reduce the risk of water connection plugging</p> Signup and view all the answers

<p>CSA B51</p> Signup and view all the answers

<p>A vessel as defined in the Act</p> Signup and view all the answers

<p>To prevent the system from draining while testing the low water cut-off</p> Signup and view all the answers

<p>They restrict water flow to the float chamber</p> Signup and view all the answers

<p>Coil or fin-tube type boilers</p> Signup and view all the answers

<p>To cut off the fuel supply to the burner if the flow rate is reduced</p> Signup and view all the answers

<p>Electric boilers of the resistance element type</p> Signup and view all the answers

<p>Two means of feeding water</p> Signup and view all the answers

<p>Two independent low water cut-offs</p> Signup and view all the answers

<p>To prevent tripping the boiler while determining that the water column is functional and in good operating condition</p> Signup and view all the answers

<p>No valves are allowed</p> Signup and view all the answers

<p>To facilitate cleaning</p> Signup and view all the answers

<p>To provide contingency in case one connection becomes plugged</p> Signup and view all the answers

<p>Above the LPWL and the lowest visible part of the gauge glass</p> Signup and view all the answers

<p>One low-water fuel cutoff located above the lowest safe permissible water level</p> Signup and view all the answers

<p>To facilitate cleaning and inspection</p> Signup and view all the answers

<p>At least two devices with separate pipe connections</p> Signup and view all the answers

<p>The boiler shuts down and locks out</p> Signup and view all the answers

<p>Manual operator intervention is required to reset the cut-off and restart the boiler</p> Signup and view all the answers

<p>Testing frequencies and procedures recommended by ASME BPVC VII and CSD-1</p> Signup and view all the answers

<p>To test the low water cut-off's response to a rapid loss of water</p> Signup and view all the answers

<p>In a readily accessible location for internal inspection and cleaning</p> Signup and view all the answers

<p>Forced circulation to prevent overheating</p> Signup and view all the answers

<p>Two means of feeding water</p> Signup and view all the answers

<p>Electric electrode type boilers</p> Signup and view all the answers

<p>To facilitate cleaning</p> Signup and view all the answers

<p>Two independent low water cut-offs</p> Signup and view all the answers

<p>The dampers return to their normally open position</p> Signup and view all the answers

<p>To prevent the system from draining while testing the low water cut-off</p> Signup and view all the answers

<p>Electric resistance type boilers</p> Signup and view all the answers

<p>Rules for Construction of Power Boilers</p> Signup and view all the answers

<p>To prevent tripping the boiler while determining that the water column is functional</p> Signup and view all the answers

<p>To protect against boiler damage due to low water level</p> Signup and view all the answers

<p>They interfere with the operation of the control</p> Signup and view all the answers

<p>To bypass the low-water cut-off during blowdown</p> Signup and view all the answers

<p>One low-water fuel cut-off device</p> Signup and view all the answers

<p>Because it requires draining significant amounts of water from the system</p> Signup and view all the answers

<p>They must be able to run continuously</p> Signup and view all the answers

<p>To ensure the safe operation of boilers</p> Signup and view all the answers

<p>The boiler will not be able to operate</p> Signup and view all the answers

<p>To automatically cut off the fuel supply before the surface of the water falls below the lowest visible part of the water gage glass</p> Signup and view all the answers

<p>Part HG-614</p> Signup and view all the answers

<p>400,000 Btu/hr</p> Signup and view all the answers

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

<p>Controls and safety devices for automatically fired boilers</p> Signup and view all the answers

<p>Two</p> Signup and view all the answers

<p>A means shall be provided for testing the operation of the external low-water fuel cutoff</p> Signup and view all the answers

<p>A vessel as defined in the Act</p> Signup and view all the answers

<p>To automatically cut off the fuel supply when the circulating flow is interrupted</p> Signup and view all the answers

<p>ASME CSD-1</p> Signup and view all the answers

<p>To provide contingency in case one connection becomes plugged</p> Signup and view all the answers

<p>The lowest visible part of the gauge glass</p> Signup and view all the answers

<p>The boiler shuts down and locks out</p> Signup and view all the answers

<p>Manual intervention to reset the cut-off and restart the boiler</p> Signup and view all the answers

<p>To facilitate cleaning and inspection</p> Signup and view all the answers

<p>Two</p> Signup and view all the answers

<p>Three common tests: rapidly draining the float chamber, isolating the feedwater and blowing off the boiler, and isolating the feedwater and allowing the boiler to steam off water</p> Signup and view all the answers

<p>To provide individual connections to the boiler</p> Signup and view all the answers

<p>One low-water fuel cutoff intended for hot-water service</p> Signup and view all the answers

<p>To prevent boiler damage by shutting off the fuel supply when the water level falls too low</p> Signup and view all the answers

<p>To minimize the risk of explosion due to low water level</p> Signup and view all the answers

<p>To blow down the low-water cut-off without tripping the boiler</p> Signup and view all the answers

<p>It means that the low-water cut-off devices must be installed in a way that they cannot be rendered inoperative by valves or switches</p> Signup and view all the answers

<p>Because it may require draining significant amounts of water from the system</p> Signup and view all the answers

<p>To reduce the risk of overheating</p> Signup and view all the answers

<p>To prevent the boiler from tripping during a blowdown</p> Signup and view all the answers

<p>To minimize the risk of explosion due to low water level</p> Signup and view all the answers

<p>The devices must be tested under operational conditions</p> Signup and view all the answers

<p>To prevent simultaneous failure of all cut-off devices</p> Signup and view all the answers

<p>Above the LPWL, and in no cases lower than the lowest visible part of the gauge glass</p> Signup and view all the answers

<p>Rapidly draining the float chamber</p> Signup and view all the answers

<p>Safety shutdown and lockout</p> Signup and view all the answers

<p>To facilitate cleaning and inspection</p> Signup and view all the answers

<p>At least two automatic low-water fuel cutoff devices</p> Signup and view all the answers

<p>To facilitate internal inspection and cleaning</p> Signup and view all the answers

<p>To prevent boiler damage due to low water level</p> Signup and view all the answers

<p>Testing frequencies and procedures are covered in Part B, Unit 4, Chapter 4 Operational Checks</p> Signup and view all the answers

<p>The boiler requires manual operator intervention to reset the cut-off</p> Signup and view all the answers

<p>To cut off the fuel supply to the burner if the flow rate is reduced</p> Signup and view all the answers

<p>Hot water boilers requiring forced circulation to prevent overheating</p> Signup and view all the answers

<p>Two means of feeding water</p> Signup and view all the answers

<p>To facilitate cleaning</p> Signup and view all the answers

<p>To prevent plugging in the water connections</p> Signup and view all the answers

<p>400,000 Btu/hr (117 kW)</p> Signup and view all the answers

<p>Two independent low water cut-off devices</p> Signup and view all the answers

<p>The dampers return to their normally open position</p> Signup and view all the answers

<p>To provide a temporary bypass of the LWCO during testing</p> Signup and view all the answers

<p>Control requirements for automatically fired boilers</p> Signup and view all the answers

<p>An automatic low-water cut-off on each boiler pressure vessel</p> Signup and view all the answers

<p>To prevent interference with the LWCO operation</p> Signup and view all the answers

<p>The installation of valves</p> Signup and view all the answers

<p>A flow-sensing device installed in lieu of the low-water fuel cutoff</p> Signup and view all the answers

<p>To prevent the system from draining while testing the low water cut-off</p> Signup and view all the answers

<p>One automatic low-water cut-off device on each boiler pressure vessel</p> Signup and view all the answers

<p>To test the operation of the external low-water fuel cutoff without resorting to draining the entire system</p> Signup and view all the answers

<p>At least two automatic low-water fuel cutoffs, one of which may be a combined feeder/cut-off device</p> Signup and view all the answers

<p>Forced circulation to prevent overheating of the coils or tubes</p> Signup and view all the answers

<p>To prevent plugging in the water connections</p> Signup and view all the answers

<p>Steam boilers = At least two independent low-water fuel cut-off devices Hot water boilers = A low-water fuel cut-off device, except as specified in Clause 6.3.2.3 Large capacity boilers = No specific requirement mentioned Automatically fired boilers = A low-water fuel cut-off device, except as specified in Clause 6.3.2.3</p> Signup and view all the answers

<p>Boiler trip = Negative consequences for plant operations Blowdown = Operator must maintain pressure on the bypass switch Low water cut-off testing = No valves may be installed on the low-water cut-off piping Normal water level = Operator can release the pushbutton to restore the operation of the low water cut-off control</p> Signup and view all the answers

<p>Momentary contact switch = To blow down the low water cut-off without tripping the boiler Flow-sensing device = Not mentioned in the provided content Low-water fuel cut-off device = To cut off fuel supply during low water conditions Bypass switch = To restore the operation of the low water cut-off control</p> Signup and view all the answers

<p>Clause 6.3.2.1 = Steam boilers not continuously attended by a certified operator Clause 6.3.2.2 = Automatically fired hot water boilers not continuously attended by a certified operator Clause 6.3.2.3 = Exception for hot water boilers Clause 6.3.2.4 = Not mentioned in the provided content</p> Signup and view all the answers

<p>Negative consequences for plant operations = Boiler trip Low water cut-off inoperable = Valves or switches installed on the low-water cut-off piping Difficulty in testing the low water cut-off = Significant amounts of water drained from the system No specific consequence mentioned = Large capacity boilers</p> Signup and view all the answers

<p>Low-water fuel cut-off devices = Installed so that they cannot be rendered inoperative Flow-sensing devices = Not mentioned in the provided content Bypass switches = Installed in parallel to the low water cut-off switch Valves = Not permitted on the low-water cut-off piping</p> Signup and view all the answers

<p>Steam boilers = At least two certified operators Hot water boilers = Not continuously attended by a certified operator Large capacity boilers = Not continuously attended by a certified operator Automatically fired boilers = Not continuously attended by a certified operator</p> Signup and view all the answers

<p>Blowdown = To test the low water cut-off device Testing the low water cut-off = To ensure the device is functioning properly Installing a bypass switch = To allow the boiler to continue operating during a blowdown Restoring the operation of the low water cut-off control = To resume normal boiler operation</p> Signup and view all the answers

<p>ASME BPVC I, Part PEB-13.2 = Electric boilers of the resistance element type shall be equipped with an automatic low-water cutoff on each boiler pressure vessel ASME BPVC I, Part PG-61.1 = Two means of feeding water are required for boilers with more than 47 m2 of water heating surface ASME BPVC IV, Part HG-604 = No shutoff valves of any type shall be placed in the water piping connection of a steam heating boiler ASME BPVC VII, Part C5.100 = Each automatically fired boiler shall have two independent low water cut-offs</p> Signup and view all the answers

<p>Coil or fin-tube type boilers = Exempt from low water cut-off requirements of 6.3.2.2 Electrode type boilers = No low-water cutoff is required Electric boilers of the resistance element type = Required to have an automatic low-water cutoff on each boiler pressure vessel Automatically fired hot water boilers = Required to have a flow-sensing device to automatically cut off the fuel supply to the burner</p> Signup and view all the answers

<p>Dampers = Restrict water flow to the float chamber in case of a sudden onrush of water Flow-sensing device = Automatically cut off the fuel supply to the burner if the flow rate is reduced Low water cut-off = Cut off the power supply to the heating elements before the surface of the water falls below the visible level in the gage glass Test and check fittings = Prevent the system from draining while testing the low water cut-off</p> Signup and view all the answers

<p>ASME BPVC I = No specific requirement for testing low water cut-offs ASME BPVC VII = Recommended to have two independent low water cut-offs for automatically fired boilers ASME BPVC IV = Requires a cross or equivalent fitting in the water piping connection of a steam heating boiler CSA B51 = Requires a flow-sensing device to be installed on automatically fired hot water boilers</p> Signup and view all the answers

<p>Water column = Connected to the boiler by pipe and fittings Low water cut-off = Installed on the boiler outlet piping Flow-sensing device = Installed on the hot water outlet Float chamber = Located in the low water cut-off valve</p> Signup and view all the answers

<p>ASME BPVC I = Rules for Construction of Power Boilers ASME BPVC IV = Rules for Construction of Heating Boilers ASME BPVC VII = Recommended Guidelines for the Care of Power Boilers CSA B51 = Code for the installation and maintenance of boilers</p> Signup and view all the answers

<p>Automatically fired boilers = Required to have two independent low water cut-offs Electric boilers = Required to have an automatic low-water cutoff on each boiler pressure vessel Fuel-fired boilers = Not required to have low water cut-off devices Waste heat fired boilers = Not required to have low water cut-off devices</p> Signup and view all the answers

<p>Momentary contact bypass switch = Prevent the boiler from tripping when the low water cut-off float chamber is blown down Cross or equivalent fitting = Facilitate cleaning of the water piping connection Flow-sensing device = Automatically cut off the fuel supply to the burner if the flow rate is reduced Test and check fittings = Prevent the system from draining while testing the low water cut-off</p> Signup and view all the answers

<p>ASME BPVC I, Part PG-61.1 = Two means of feeding water are required ASME BPVC IV = No shutoff valves of any type shall be placed in the water piping connection ASME BPVC VII = Recommended to have two independent low water cut-offs CSA B51 = Exempt from low water cut-off requirements of 6.3.2.2</p> Signup and view all the answers

<p>ASME BPVC = Specifies the LWCO requirements for steam heating boilers ASME CSD-1 = Addresses the unique hazards of boilers in capacities up to 300 boiler horsepower output CSA B51 = Requires a flow-sensing device to be installed at the hot water outlet for forced circulation coil-tube boilers ASME BPVC I = Requires low water fuel cut-off devices to be installed on steam heating boilers</p> Signup and view all the answers

<p>Flow-sensing device = Automatically cuts off the fuel supply when the circulating flow is interrupted Low-water fuel cutoff = Cuts off the fuel supply before the surface of the water falls below the lowest visible part of the water gage glass Momentary contact bypass switch = Installed in parallel to the low water cut-off switch to facilitate testing Test and check valve = Allows for testing the operation of the external low-water fuel cutoff without resorting to draining the entire system</p> Signup and view all the answers

<p>Dampers = Return to their normally open position when the float chamber drain is closed Low water cut-off = Trips the boiler if the water level falls below the lowest permissible level Flow-sensing device = Cuts off the fuel supply to the burner if the flow rate is reduced Float chamber = Fills with water when the system is in normal operation</p> Signup and view all the answers

<p>Automatically fired steam boilers = Must have at least two automatic low-water fuel cutoffs Hot water boilers with heat input greater than 400,000 Btu/hr = Must have an automatic low-water fuel cutoff Forced circulation coil-tube boilers = Must have a flow-sensing device installed in lieu of the low-water fuel cutoff Modular steam heating boilers = Must have an automatic low-water fuel cutoff on each module</p> Signup and view all the answers

<p>ASME BPVC = Specifies the requirements for boilers and pressure vessels ASME CSD-1 = Addresses the unique hazards of boilers in capacities up to 300 boiler horsepower output CSA B51 = Regulates the design, construction, and installation of boilers and pressure vessels in Canada ASME BPVC I = Specifies the requirements for steam heating boilers</p> Signup and view all the answers

<p>Low-water fuel cutoff = Installed in individual chambers (water columns) attached to the boiler by separate pipe connections below the waterline Flow-sensing device = Installed in forced circulation coil-tube boilers to prevent overheating of the coils or tubes Test and check valve = Installed to facilitate testing of the external low-water fuel cutoff Momentary contact bypass switch = Installed in parallel to the low water cut-off switch to facilitate testing</p> Signup and view all the answers

<p>Steam boilers not continuously attended by a certified operator = Exempt from low water cut-off requirements Hot water boilers with heat input less than 400,000 Btu/hr = Exempt from automatic low-water fuel cutoff requirements Modular steam heating boilers = Exempt from individual low-water fuel cutoff requirements Boilers with more than 47 m2 of water heating surface = Exempt from low water fuel cut-off requirements according to ASME BPVC I, Part PG-61.1</p> Signup and view all the answers

<p>ASME BPVC = Requires a means of testing the operation of the external low-water fuel cutoff without resorting to draining the entire system ASME CSD-1 = Recommends testing low water cut-offs in heating boiler and power boiler service CSA B51 = Requires a flow-sensing device to be installed at the hot water outlet for forced circulation coil-tube boilers ASME BPVC I = Requires a rapid drain test for low water cut-offs</p> Signup and view all the answers

<p>Flow-sensing device = Prevents overheating of the coils or tubes in forced circulation coil-tube boilers Low-water fuel cutoff = Cuts off the fuel supply before the surface of the water falls below the lowest visible part of the water gage glass Momentary contact bypass switch = Facilitates testing of the low water cut-off Test and check valve = Allows for testing the operation of the external low-water fuel cutoff without resorting to draining the entire system</p> Signup and view all the answers

<p>ASME BPVC = Requires valves to be installed in the interconnecting piping of the LWCO ASME CSD-1 = Recommends valves to be installed in parallel to the low water cut-off switch CSA B51 = Prohibits valves from being installed on the low-water cut-off piping ASME BPVC I = Requires valves to be installed in the water connections to a water column</p> Signup and view all the answers

<p>ASME BPVC = Requires individual water connections for each low-water fuel cutoff ASME CSD-1 = Requires a common steam connection for the low-water fuel cutoffs CSA B51 = Requires a flow-sensing device to be installed at the hot water outlet for forced circulation coil-tube boilers ASME BPVC I = Requires the steam and water connections to a water column to be located below the waterline</p> Signup and view all the answers

<p>ASME CSD-1 Part CW-120 = At least two automatic low-water fuel cut-off devices for high-pressure steam boilers ASME CSD-1 Part CW-130 = One low-water fuel cutoff for hot water boilers ASME BPVC I = Low water fuel cut-off devices for boilers with more than 47 m2 of water heating surface ASME BPVC VII = Recommendations for testing frequencies and test procedures for low water cut-offs</p> Signup and view all the answers

<p>High-pressure steam boilers = At least two automatic low-water fuel cut-off devices Hot water boilers = One low-water fuel cutoff Automatically fired boilers = Low water fuel cut-off devices for boilers with more than 47 m2 of water heating surface Low-pressure steam boilers = One automatic low-water fuel cutoff</p> Signup and view all the answers

<p>Rapidly draining the float chamber = To see if the boiler shuts off Isolating the feedwater, and blowing off the boiler = A slow drain test Isolating the feedwater, and allowing the boiler to steam off water = To test the low-water cut-off functionality Filling the float chamber = To test the boiler's startup procedure</p> Signup and view all the answers

<p>Cross or equivalent fitting = To facilitate cleaning and inspection of the water piping connection Flow-sensing device = To detect the flow of water in the boiler Momentary contact switch = To provide a temporary override of the low-water cut-off Low-water fuel cut-off device = To shut off the boiler fuel supply when the water level is low</p> Signup and view all the answers

<p>ASME CSD-1 Part CW-120 = No valves permitted on the low-water cut-off piping ASME BPVC I = Valves permitted on the low-water cut-off piping for boilers with more than 47 m2 of water heating surface ASME BPVC IV = Valves permitted on the interconnecting piping of the LWCO ASME BPVC VII = No valves permitted on the low-water cut-off piping for automatically fired boilers</p> Signup and view all the answers

<p>High-pressure steam boilers = Lowest cut-off control must be situated above the LPWL Hot water boilers = Low-water fuel cutoff can be located anywhere above the lowest safe permissible water level Low-water condition = Manual operator intervention required to reset the cut-off and restart the boiler Flow-sensing device installation = Required for automatically fired hot water boilers not continuously attended by a certified operator</p> Signup and view all the answers

<p>Steam and water connections to a water column = Readily accessible for internal inspection and cleaning Low-water fuel cut-off device = Located in individual chambers (water columns) Flow-sensing device = Installed at the hot water outlet Cross or equivalent fitting = Installed in the water piping connection at every right angle</p> Signup and view all the answers

<p>ASME CSD-1 = Rules for hot water boilers and high-pressure steam boilers ASME BPVC I = Requirements for boilers with more than 47 m2 of water heating surface ASME BPVC IV = Requirements for the installation of valves in the interconnecting piping of the LWCO ASME BPVC VII = Recommendations for testing frequencies and test procedures for low water cut-offs</p> Signup and view all the answers

<p>Rapid drain test = To test the low-water cut-off functionality under rapid water loss Slow drain test = To test the low-water cut-off functionality under slow water loss Steam off test = To test the boiler's ability to steam off water Float chamber drain test = To test the boiler's ability to shut off under low water conditions</p> Signup and view all the answers

<p>Low-water condition restored to normal = Manual operator intervention required to reset the cut-off and restart the boiler Valves installed on the low-water cut-off piping = LWCO rendered inoperative Float chamber drain closed = Boiler shut off Low-water fuel cut-off device triggered = Safety shutdown and lockout</p> Signup and view all the answers