Power Engineering CH B3 Questions and Answers 2023

Power Engineering CH B3 Questions and Answers 2023 With reference to ASME BPVC I, PG-73 (2017): Each safety valve or safety relief valve shall have a substantial lifting device activated only when the valve is subjected to a pressure at least _____ % of the boiler operating pressure: 75 The following component is included in a 'fuel oil train' but not 'fuel gas trains': Low Oil temperature cut-off switch According to ASME BPVC I, PG-73 (2015), the use of pressure relief valve(s) (PRV) with bronze (SB-61, SB-148) parts is prohibited for superheaters operating over ________°C: 230 Low-Fire Start Switch: prevents ignition of pilot or main burner if air/fuel are not in low-fire position With reference to ASME BPVC I, PG-67.2 (except as noted in PG-67.4): If a boiler has a maximum allowable working pressure of 1000 kPa, what would be the maximum pressure allowed when the safety valve is open? 1060 kPa A mercury switch bulb is under high vacuum and contains inert gas: to prevent corrosion of the contacts With reference to ASME BPVC IV, HG 400.1 (e): The safety valve for each steam heating boiler when operated at maximum capacity, the pressure rise shall not be more than ________ of the maximum allowable working pressure: 35 kPa All boilers having a fixed water level must have at least: one gage glass During warmup of a cold hot-water boiler, excessive pressure build-up is prevented by: an expansion tank To conform to code, a low-water fuel cut-off switch must close the automatic fuel valve(s) before the water level is: below the lowest visible part of the gauge glass. Separately mounted gage glasses are used to provide a/an __________ indication of level over a certain vertical distance on the vessel: continuous The main function of a flame failure device is to: shut off the fuel when the burner flame goes out Code applies specifically to low pressure steam and hot water installations is: ASME 31.9 With reference to ASME BPVC IV, HG 401.1 (e): Safety shall have a controlled blowdown of: 2 psi to 4 psi The required pre-purge airflow rate prior to ignition for a burner equipped with a mechanical drive for combustion air is: not less than 60% required at maximum input According to ASME PTC-25: The description for a pressure relief valve characterized by rapidly opening and is normally used for compressible fluids is a: Safety Valve It is recommended that on an operating pressure relief valve (PRV) on power boilers operating under 2760 kPa to undergo a performance test: Every 6 months A blowdown ring on a safety valve is use to: adjust the blowdown differential ASME B31.1 and BPVC I classify high pressure piping into the following categories: Boiler proper, boiler external, and non-boiler external An operating control switch for an ON-OFF boiler: uses a differential spring to reduce cycling Boiler fittings must comply with ASME (BPVC) codes and in Canada CSA: B-51 To correct pressure cycling due to the narrow cut-in and cut-out set points of a on-off control steam heating boiler: adjust the differential adjustment screw on the control Which of the following item is not required for a hot water heating system: air separator ASME IV, Part HLW-800.1 states that the pressure setting for the pressure relief valve of water heaters can be based on the component with the: lowest maximum allowable working pressure (MAWP) The programmer will go through a post purge: on any type of shutdown except by power loss A flame control switch is used to: manually control the firing rate when the switch is set on manual An automatic fill valve for a hot water heating system: is not mandatory The function of a Low Combustion Air Pressure Fuel Cut-Off Switch is: to shut down the burner when the combustion air is insufficient Pressure relief valves on a fuel gas line protect the pilot and main burner controls from: excessive fuel gas pressure An ON-OFF steam boiler: operates most efficiently at continuous firing On low pressure steam boilers, the boiler outlet valves are usually: gate valves because of their low resistance to flow With reference to ASME BPVC I, PG-71.2: Pressure relief valves shall be connected to stand in at a/an _________ position: Up-right A gauge glass may be surrounded by a number of thin rods to: protect the glass from damage. With reference to ASME 31.1, Part 122.1.7(C.1), ordinary globe valves not used on blow-off connections due to: pockets where sediment can collect Fuel gas piping must be sized properly to ensure: the required supply delivery is maintained With reference to ASME BPVC I, PG-71.3: If the discharge pipe of a safety valve should be separately supported it must be arranged to: prevent undue stress on the safety valve The purpose of the ________ on top of the spindle above the spring of a PRV is to prevent the spring tension from accidental adjustment: jam nut / lock nut According to CSA B149.3, a primary controller limits the pilot trial for ignition period to: maximum 10 seconds In a hot water heating system equipped with a closed expansion tank, if the system is completely filled with the temperature raised to the point of excessive expansion: the pressure build-up opens the safety relief valve Automatically fired boilers will restart when: water level has been re-established For hot water boilers operating up to 400 kPa, the higher safety relief valve setting must not exceed the MAWP by: 40 kPa In a feedwater line, a stop valve is installed between the check valve and the boiler: to isolate the feedwater line for maintenance and repair without draining the boiler According to ASME BPVC I, PG-73.3.4 (2015), the use of pressure relief valves (PRV) with SB-61 and SB-148 materials is prohibited for superheaters operating over ________°C: 230 A damper positioning switch used on boilers with a high-low fire control has three positions: automatic, high, and low ASME IV, Part HLW-800.1 states that each water heater must have at least ______ officially rated temperature and pressure safety relief valve(s): 1 To ensure consistent operation and proper valve disc seating, safety valves fit with: top & bottom guides The fitting attached between a high-pressure steam boiler and the pressure steam gauges consists of the following: test connection, syphon, and isolation valve A hot water boiler is protected from over pressure by means of a/an: safety relief valve