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oiler
| Question | Answer |
|---|---|
| what is the proper procedure for blowing down a main boiler water level gauge glass? | close upper root open drain and blow clear upper root connection ....close lower root open upper root and blow clear upper root connection and glass ....close drain then reopen lower root. |
| if during steaming of a main boiler what is desired to manually lower the water level ...what is the preferred method? | using the surface blow down valve. |
| what blow down valve is permissible to use for a continuous blow on a main boiler? | the small volume bottom blow down valve or surface blow down valve. |
| when is it permissible to perform a large volume bottom blow on a main boiler? | when the boiler pressure has dropped to manufacturers specifications after it has finished firing. |
| under what conditions is a surface blow performed on a main boiler? | -to reduce the water level -to lower the boiler water density due to excessive boiler water treatment chemicals -to remove floating impurities. |
| assuming a bottom blow arrangement for a main boiler includes the bottom blow down valve itself the bottom blow down guardian valve and the blow down skin valve what valve is opened last and spun open quickly when performing a bottom blow? | bottom blow down guardian valve |
| assuming that a bottom blow on a main boiler is initiated at a 150 psi and the particular bottom blow event has been completed when would the next blow down even be initiated? | when the boiler water level has dropped 2 to 3 inches in the glass |
| operating under a steady load what would be the first indication that soot had built up sufficiently on the main boiler tubes to noticeably effect heat transfer and were tubes should be blown. | a rise in stack temp. |
| for an existing load at what point should tubes be blown on a main boiler? | a stack temp 25 to 35 degrees above normal for the load. |
| before commencing to blow tubes on a main boiler why must permission first be requested and obtained from the bridge? | so that the ships course can be altered if need be to avoid soot from falling on the main deck. |
| before commencing to blow down tubes on a main boiler it must be determined that adequate water resources exist to compensate for losses up the stack other then the DC heater what tank or vessel level should be checked? | makeup reserve feed tank on service level |
| before commencing to blow tubes on a main boiler what must be done in terms of the forced draft pressure? | the force draft pressure must me increased |
| when manually blowing tubes on a main boiler what precaution should be taken when operating steam operated soot blowers to prevent soot from caking up on the tubes or from causing tube erosion? | soot blower manifolds should be thoroughly warmed up and drained |
| when manually blowing tubes on a main boiler it may require more then one revolution of the soot blower element to fully blow the soot clear. how is this conveniently checked? | by checking the stack via the periscope |
| when blowing tubes on a main boiler what tubes should be blown first? | economizer or air heat tubes |
| once a path has been cleared what is the sequence of operation of soot blower elements? | always follow the sequence of recommended by the manufacturer. |
| what tubes on a main boiler should be blown last? | economizer or air heater tubes |
| what type of boiler water contamination would most likely cause boiler tube failure as a result of hard scale deposits retarding heat transfer which causes tubes to overheat? | water with excessive treatment chemicals |
| which of the following air compressors provide air to start both main and SSDG diesel engines is powered from the main switchboard when electric motor driven but maybe engine driven and normally cycles on and off while the vessel is underway? | topping air compressor |
| which of the following air compressors provide air to start main ans SSDG Diesel engines is invariably electric motor driving and powered from the main switchboard and is normally used to prepare a vessel for getting underway? | starting air compressor |
| which of of the following air compressors provides air to start the SSDG engines only and when the start air and the air receivers are empty and is powered from emergency switchboard? | emergency air compressor |
| what is the potential source of dissolved oxygen and carbon dioxide contamination of boiler water? | improperly taken up main condensate pump shaft gland packing. |
| what type of boiler water contamination would most likely cause boiler tube failure due to localized blistering? | oil contamination of boiler water |
| what would be the most immediate evidence that lube oil contamination of boiler exist? | presence of a yellow band and possible foaming above the water in the boiler water sight glass |
| what is the primary means by which oil contamination maybe removed from the boiler | surface blow down |
| other then keeping feed water within acceptable salinity limits and preforming necessary blow downs what from the boiler water treatment guards against hard scale deposits on boiler tubes? | chemical treatment |
| other then keeping the system tight to prevent the ingress of air what for of boiler water treatment guards against corrosion pitting of boiler tubes? | thermal treatment |
| other then segregating contaminated drains from o expandnon-contaminated drains what from the boiler water treatment guards against localized blistering of boiler tubes? | mechanical treatment |
| when adjusting the firing rate on a non-automated boiler manually what is the correct procedure for increasing the firing rate? | first increase the air delivery then increase the fuel delivery |
| when adjusting firing rate on a non-automated boiler manually what is the correct procedure for decreasing the firing rate? | first decrease the fuel delivery then decrease the air delivery |
| when controlling feed to a boiler manually via a main feed stop check what is the correct procedure in responding to a main boiler water level increase associated with a sudden increase in steam demand? | open the feed stop check wider to compensate for swell |
| when controlling to boiler manually via the main feed stop check what is the correct what is the correct procedure in responding to main boiler water level decrease associated with a sudden decrease in steam demand? | throttle down on the feed stop check in order to compensate for shrink |
| what actually causes shrinking as it pertains to a temporary decrease in main boiler water level due to a decrease steam demand? | a sudden decrease in boiler pressure causing the size of the entreined steam bubbles to contract |
| what actually causes swell as it pertains to a temporary increase in main boiler water level due to increase steam demand? | a sudden increase in boiler pressure causing the size of the entrained steam bubbles to expand |
| when securing a main boiler how is the main how is the supperheater protected from overheating when the steam stops are closed? | by opening the superheater vent and drain valves. |
| assuming another boiler is online when securing a main boiler when should the main and aux. steam stop be closed? | when the boiler pressure actually drops below the actual line pressure. |
| when securing a main boiler how much time should be allowed for a boiler to loose all pressure? | the boiler should be cooled down according to manufactures instructions |
| when securing a main boiler what adjustable process determines how long will it take for the boiler to loose all pressure? | regulating the amount of throttling of the supperheater vent valve |
| when securing a main boiler when should the air cock be opened to prevent a vacuum from being drawn on the boiler? | 15 psi |
| if a main boiler water level is found to be out of sight low or high what is the correct sequence of actions as a casualty control measure after securing the fuel supply? | secure the incoming feed ...open the supperheater vent valve .....close the boiler steam stop valve |
| if the main boiler water level is found to be out of sight where it is unknown to were the boiler water level is out of sight high or low how should it be determined what condition exists. | blow down the gauge glass to determine whether full or empty |
| if the main boiler water is found to be out of sight low what should be done as a casualty control measure | under no circumstances should any attempt be made to bring up the boiler water level |
| if the main boiler water is found to be out of sight low and casualty control measures are taken the boiler pressure should be relieved gradually ....how is this done? | opening the boiler safety valves by the hand lifting gear |
| if a main boiler water is found to be out of site high what should be done to reduce the boiler water level as a casualty control measure? | preform a surface blow down to restore the level to normal |
| if the main boiler water level is found to be out of sight high what should be done to drain away any moisture that may of carried over to the superheater | open the superheater drains |
| what would be the primary indication that there is an economizer fire in a main boiler | extremely high stack temp |
| if the main boiler has an economizer fire other then securing the fuel supply opening the superheater vent valve and closing the steam stop valve what should be done? | secure the air supply maintain the feed |
| if it has been determined that there is a main boiler economizer fire what should be done to prevent the economizer from overheating as long as soot is burning? | increase the feed flow to the boiler through the economizer |
| if it has been determined that the main boiler has an economizer fire what should be done 1st to extinguish the fire besides isolating the fire from the fuel and air supply and maintaining a healthy feed | the condensate system should be placed into operation with the recirculation valve wide open |
| prior to admitting steam to a condensing turbine vacuum must be raised on the appropriate condenser other that placing the circulating sea water and condensate systems into operation how is a potential vacuum raised on a condenser? | supplying steam to the 2nd stage air ejector only |
| prior to placing a condensing turbine into service a full depth vacuum must be raised on the appropriate condenser How is a full vacuum raised on the condenser? | cutting in gland sealing steam .....supplying steam to the first stage air ejector. |
| which of the following steam turbines does NOT require gland sealing steam? | main feed pump drive turbine |
| which of the following steam turbines has associated with it gland leak off (exhaust) steam? | -main propulsion turbine -ships service turbogenerator drive turbine -main feed pump drive turbine |
| what is the source of steam for the first stage feed heater (if fired) while a vessel is underway? | low pressure turbine extraction or bleed steam |
| what is the source of steam for the 2nd stage feed heater? | main feed pump drive turbine |
| what is the source of steam for the 3rd stage feed heater (if fired) while a vessel is underway | high pressure turbine extraction or bleed steam |
| to where do the condensate drains from the inter-condenser of a main ejector assembly drain? | to the main condenser |
| to were dos the 1st stage of main air assembly discharge? | inter-condensing shell |
| from were dos the 2nd stage of a main air ejector assembly draw a suction? | inter-condensing shell |
| to where dos the 2nd stage of a main air ejector discharge? | after-condenser shell |
| other than from the various turbine gland exhaust from where does the gland exhaust condenser shell receive steam? | -main air ejector after-condenser shell -direct contact heater vent -atmospheric drains tank vent |
| during machinery space rounds you notice the sudden appearance of oil in the contaminated drains inspection tank as viewed through the inspections window. what is the correct response? | notify the watch engineer immediately |
| in general what should the level be on a contaminated drains inspection tank as viewed through the inspection window? | middle of glass |
| to were are the high pressure drains fed? | direct contact heater |
| what type of steam trap is commonly used for high pressure drain applications? | orifice type steam traps |
| high pressure drains are associated with collecting condensate drains from steam systems operating at what temp? | 150 psi or above |
| prior to admitting steam to a feed pump turbine what should be done to insure adequate lubrication? | -check oil level and add makeup oil as necessary -check for contamination of the oil with water -pre-lube bearings with electric motor driven pump or hand pump as approprate |
| how is the oil level of a turbine driven feed pump checked? | by a dipstick fitted to the side of the sump |
| when adding oil to the sump of a turbine driven feed pump what should the level be brought up to on the dipstick? | oil should be added until the oil reaches the "full" (max) mark |
| when checking for water contamination of a turbine driven feed pump oil , how is this checked for | opening the lube oil sump drain valve, observing the drainage, and re closing when clean oil drains out |
| . once steam has been admitted to an auxiliary turbine for the purpose of warming up, at what point should the steam supply and turbine casing drain valves be closed | when condensate is no longer flowing from the drains but only steam |
| 122.for what reason is a geared steam turbine propulsion plant lubriacting oil system typically of the gravity feed type? | to allow time for the turbne to be brought to a stop with continuous oil pressure on a loss of the main lube oil pumps |
| 123. if a lube oil purifier is improperly lined up, a loss of lube oil from the main engine gravity feed lubriacting oil system may result. what should be the first observable symptom of this? | drop in the level of the main lube oil sump tank |
| 124. if a lube oil purifier is improperly lined up, a gain of lube oil into the main engine gravity feed lubricating oil system may result. what would be the first observable symptoms of this? | gain in the oil level of the main lube oil sump tank |
| 125. what is the normal operating level of the gravity feed tank of the main engine gravity feed lubricating oil system while a vessel is underway? | constantly overflowing |
| 126. Which of the following steam plant condensers would use seawater as a condsnsing medium? | main and auxilary condensers |
| 127. what is the maximum oil temperature rise through the bearing for a geared steam turbine drive main engine, comparing the inlet to the outlet? | 50 |
| 128. What is the maximum lube oil inlet temperature for geared steam turbine drive main engine lubricating oil? | 130 |
| 129. what is the maximum lube oil outlet temperature for geared steam turbine drive main engine lubricatin oil? | 180 |
| 130. other thean various levels, pressures, and temperatures, when making rounds on a geared steam turbine drive main engine lubrication oil system what is important to check? | that the gravity feed lube oil tank is constantly overflowing as viewed through the overflow sight glass |
| 131. what is typical range of steam pressures associated with the gland sealing steam system as controlled by the gland seal regulator? | 1/2 to 2 psig |
| 132. While monitoring a main propulsion turbine set while in standby mode, you hear a rubbng noise coming from one of the turbines. What is the appropriate response? | the watch enigneer definitely should be notified immiediately so that the turbine may be tripped |
| 133. while operating a main propulsion turbine swet while in the standby mode, what is important? | the turbines should be turned alternatley in the ahead and astern directions |
| 138. what location would be likely as a site for transmitting propeller thrust to the ship's hull? | reduction gear or independent thrust bearing |
| 139. what is provided on oil lubricated stern tube bearing installations to deal with possible water contamination of the oil? | a coalescing lube oil filter or a lube oil centrifuge set as a purifier |
| 140. what would a build up of a attracted steel particles on a main lube oil system's magnetic type strainer magnet indicate? | an indication of reduction gear tooth wear |
| 141. for what purpose should a fuel oil duplex strainer be shifted over slowly with the strainer selector handle from the off-going to the on-coming element? | to prevent an interruption of fuel supply should the on-coming housing be partially filled wth air |
| 142. when making rounds. the heavy fuel oil settling tanks are routinely checked for accumulations of water by what method? | local stripping of the tanks |
| 143. before the main engines can be successfully turned over with the jacking gear, what system must be placed into operation first? | lubrication oil systems |
| 144. prior to turning over a turbine with steam, how is the turbine rotor prevented from wraping with gland sealing steam cut in? | turning the turbine rotor slowly wth the jacking gear |
| 145. what is true concerning steam plant alarm annunciator panels? | upon an alarm condition, the alarm light flashes and an audble alarm sounds. When the acknowledge button is depressed the audible alarm is silenced, but the alarm light remains on steadily until the alrm condition clears |
| 146. which of the following steam turbine or diesel engine applications would most likely require a speed control governor with variable speed characterstics? | main propulsion turbine set |
| 147. which of the follwoing steam turbine applications would most likely require a speed control governor with constant speed characteristics? | ship's service turbogenerator drive turbine |
| 148. which of the following steam turbne applications would most likely require a constant or differential pressure governor? | main feed pump dirve turbine |
| 149. what is the essential difference between an overspeed governor and an overspeed trip as fitted on steam turbines? | the overspeed governor limits the turbne speed by slowing it down whereas the overspeed trip limits the turbine speed by stopping the engine. |
| 150. what is another name for an overspeed governor as fitted on a steam turbne? | speed limiting governor |
| 151. in what steam plant vessel or tank is the level NOT precisely maintaned? | direct contact heater |
| 152. from what vessel or tank does the main condensate pump deaw a suction? | main condenser hot well |
| 153. to what vessel or tank does the main condensate pump discharge? | direct contact heater |
| 154. from what vessel or tank does the main feed pump normally draw a suction? | direct contact heater |
| 155. to what vessel or tank does the main feed pump normally discharge? | boiler steam drum |
| 156. to where does the main feed pump drive turbine exhaust? | direct contact heater |
| 157. to where does the hgh-pressure turbne of the main propulsion turbine set exhaust? | low pressure turbine |
| 158. to where does the low-pressure turbine of the main propuslion turbine set exhaust? | main condenser |
| 159. when losses occur in a steam and water cycle of a steam propulsion plant, where will the drop in level first present itself? | direct contact heater |
| 160. how is main condenser vauum mantained at acceptable depths? | maintaining adequate condensing water flow through the main and air ejerctor condensers |
| 161. What vessel or tank levels is controlled by means of the feed water regulator? | main boiler steam drum |
| 162. suppose that the salt water heater of a steam operated flash type distilling plant is maintained under an 11" HG vacuum and that no drains pump is fitted, just a drains regulrator. To where will the drains be fed? | main condenser hot well |
| 163. suppose that the air ejector condenser of a steam operated flash type distilling plant is maintained at atmospheric pressure and that no drians pump is fitted, just a loop seal. To where will the drains be fed? | atmospheric drains tank |
| 164. suppose that a two-stage steam operated flash type distilling plant is NOT fitted with a distillate cooler. How many salinity cells will be provided? | four |
| 165. if the makeup reserve feed tanks are located in the double bottoms, how is make-up feed water typically added to the steam and water cycle of a steam propulsion plant while underway? | it is drawn into the main condenser via vacuum drag and then pumped into the DC heater by the condensate pump |
| 166. suppose that the adding of makeup feed water to a steam and water cycle of a steam plant is automated. What occurrence will trigger the opening of the makeup valve? | a drop in DC heater level below a certain specification |
| 167.suppose that the dumping of excess feed water from a steam and water cycle of a steam plant is automated. What occurrence will trigger the opening of the spill valve? | a rise in DC heater level below a above specification |
| 168. What is the purpose of the astern guardian valve as fitted on a main propulsion turbine set? | to gurad against a loss of power in the event of astern throttle leakage when admitting steam n the ahead directon by offering two valve protecton |
| 169. whle monitoring a main propulsion turbine set, you detect excessive vibration associated with one of the turbines. What is the appropriate response? | the watch engineer definitely should be notified immiediately so that the turbine may be slowed down |
| 170. to maintain the effectveness of the DC heater, the auxiliary exhaust steam pressure must be within accipted parameters. Where does supplemental makeup steam come from during periods of low feed pump flow? | auxiliary steam system |
| 171. to maintain the effectivness of the DC heater, the auxiliary exhaust steam pressure must be within accepted parameters. where does the excess steam dump to during periods of high feed pump flow? | main or auxiliary condenser |
| 172. what is a typical sourse of steam for a bleed steam air heater as fitted on a main boiler while a vessel is underway? | intermediate pressure beeld steam |
| 173. to what vessel or tank are the drains from first stage feed heater drained to while a vessel is underway? | mian condenser hot well |
| 174. what heating coil or heater would LEAST likely drain to a contaminated drains inspection tank? | air conditioning plant heating coil |
| 175. in general, what should the water level be on a man boler while steaming and delvering steam to main and auxiliary services? | stable with a level near the middle of the sight glass |
| 176. A main boiler has experienced a safety shutdown on low water level. what i sthe required sequence of actions to restart the boiler? | first investigate and correct the problem, then restore the level to normal, the finally reset the low water safety shutdowns reset botton. |
| 177. if a main boiler has experienced a safety shutdown on a flameout condition, how many times is it permissible to depress the reset button to attempt a restart before investigating the cause of the flameout? | only once |
| 178. to prevent a gate or globe valve used for isolation steam service from jamming open, what is the correct opening procedure? | rotate the stem fully counter-clockwise then rotate clockwise approximately one quarter turn as viewed from the top of the valve. |
| 179. what main steam plant condenser is a potential source of seawater contamination of boler water? | main condenser tube leak |
| 180. what would be the most immedia evidence of a main condenser tube leak while in operation | high main condensate salinity |
| 181. what would most likely cause boiler tube failure as a result of corrosion pitting which causes tube to mechanically fail? | excessive oxygenation of the boiler |
| 1. When filing an idle, empty main boiler to what level should it be filled toprepare for light off, according to the boiler water level gauge glass? | To one to two inches from the bottom of the glass |
| 2. when fillin an idle, empty main boiler what should be the position of the air cock? | The air cock should be open wide |
| 3. before commencing to fill an idle, empty main boiler, after accomplishin waterside repairs, it must be insured that water cannot leak out. What should be checkd? | manholes and handholes in place and secured and all blow down valeves closed |
| 4. when filling an idle, empty main boiler, in brnging the boiler to the correct level, what should be checkd? | verify the ability to feed the boiler via a main feed pump verify the ability to feed the boiler with BOTH the main and auxiliary, in-port feed pumps independetly |
| 5. when filling an idle, empty main boiler, in bringing the boler to the correct level, what should be checked? | verify the ability to feed the boiler with BOTH the main and auxiliary feed lined independently |
| 6. when filling a main boiler via the auxiliary feed line, how is the feed controlled | by the auxiliary feed pump stop check valve |
| 7. when filling a main boiler via the main feed line, how is feed controlled manually at the boiler | by the man feed stop check valve |
| 8. when filling a main boiler via the main feed line where feed is controlled manually at the boiler, what is the status of the feed water regulator? | the feed water regulator is either rendered fully open or manually bypassed |
| 9. in preparation for the manual light off of a non-automated main boiler, what burner should be used for initial light off? | the mosst centrally located burner |
| 10. in preparation for the manual light off of a non-automated main boiler, what should be used for initial light off? | an atomizer with the smallest sprayer plate |
| 11. in preparation for warming up heavy fuel supplied to a non-automated main boiler prior to light off, what valve or valves must be open? | recirculation valve |
| 12. assuming the fuel oil settler (service tank) has both low and high suctions, which suction should normally be used in a non-automated plant? | low suction |
| 13. to prevent furnace explosions, it is important that a furnace be prepurged prior to light off of a manually fired boiler, in addition to starting the forced draft fan, what is done to accomplish this? | **the forced draft damper is opened *** all air register doors are opened |
| 14. when first inserting the torch when lighting off a non-automated boiler, what is the condition of the air register doors, and the root and burner valves? | Air register doors closed Root valve closed Burner valve closed |
| 15. Upon insertion and proper placement of the torch when lighting off a non automated boler, what should be done to achieve light off? | open the root valve and then open the burner valve |
| 16. Upon insertion and proper placement of the torch when lighting off a non automated boler, what should be done once the burner lights off? | remove the torch and then open the air register doors |
| 17. upon insertion and proper placement of the torch when lighting off a non-automated boler, what should be done if a flame is not immediatley established? | the burner valve should be closed |
| 18. With the proper amount of excess air and combustion complete, what should be the condition of the stack gases on a main boiler? | light brown haze |
| 19. with the proper amount of excess air and combustion complete, what should be the color of the flame on a main boiler? | golden-yellow flame |
| 20. With the proper amount of excess air and combustion complete, what should be the oxygen concentration present in the stack gases of a main boiler? | 3% to 6% |
| 21. with the proper amount of excess air and combustion complete, what should be the carbon dioxide concentration in the stack gases of a main boiler? | 12% to 14% |
| 22. With the proper amount of excess air and combustion complete, what should be the carbon monoxide concentration in the stack gases of a main boiler? | 0.0% to 0.3% |
| 23. wth insuffcient excess air, what should be the condition of the stack gases on a main boiler? | grey to balck smoke |
| 24. with insufficient excess air, what should be the color of the flame on a main boiler? | red to orange flame |
| 25. with insufficient excess air, what would be the carbon dioxide and carbon monoxide gas concentrations present in the stack gases of a main boiler comapred to normal? | carbon doxide low carbon monoxide high |
| 26. with too much excess air, what would be the condtion of the stack gases on a main boler? | clear or white smoke |
| 27. with too much excess air, what would be the color of the flame on a main boiler? | bright yellow flame to incandescent white flame |
| 28. with too much excess air, what would be the gas concentrations present in the stack gases of a main boiler comapred to normal? | carbon dioxide low oxygen high |
| 29. in addition to a panting furnace, what are the symptoms of insufficient excess air provided to a main boiler, in terms of stack condition and flame color? | grey to black smoke orange to red flame |
| 30. under what crcumstances is it advisable to bypass a stack gas heated air heater on a main boiler? | under startup and very low steam demand conditions |
| 31. if a stack gas heated air heater on a boiler should be bypassed but is not, what problem can this cause? | stack gas temperatures can fall below the dew point temperature for sulfuric acid |
| 32. WHAT IS THE PRIMARY PURPOSE OF BYPASSING A STACK GAS HEATED AIR HEATER ON A MAIN BOLER? | to prevent corrosion of the stack |
| 33.what methos is used to make minor adjustments in the air delivery to a main boiler by the forced draftsystem? | forced draft damper position |
| 34. what method is used to make major adjustments in the air delivery to a main boiler by the forced draft system? | number of forced draft fans running AND/OR forced draft fan speed as appropriate |
| 35. what method is used to make minor adjustments in the fuel delivery to a main boiler by the fuel oil service system? | fuel supply or return pressure as appropriate |
| 36. what method is used to make major adjustments in the fuel delvery to a main boiler by the fuel oil service system? | number of burners in use and size of sprayer plates |
| 37. when initially lighting off a cold main boiler, how long a time should be allotted to bring the boiler up to operating pressure? | it should be brought up to pressure slowly according to manufacturer instructions |
| 38. in addition to the air cock, when intially firing a main boiler and raising steam, which valves should be open? | superheater vent and drain valves |
| 39. when intially firing a main boiler and raising steam, at what pressure should the air cock be closed and the superheater drains throttled? | 15 to 20 psig |
| 40. when intially firing a main boiler, raising steam, and approaching operating pressure, what will happen to the boiler water level? | THE LEVEL WILL RISE AND IT SHOULD NOT BE ALLOWED TO RISE ABOVE THE TOP OF THE GLASS |
| 41. when initially firing a main boiler, raising steam, and approaching operating pressure, what is critical in terms of flow? | steam flow must be mantained though the superheater |
| 42. when cutting a main boiler in on the line, what must be the boiler pressure as compared to the line pressure? | 5 psig above line presure |
| 43. when cutting a boiler in on the line, what should be the boiler water level as viewed in the water level gauge glass? | to the middle of the gauge glass |
| 44. when steaming, what is considered evidence that moisture carryover has or may have occurred in a main boiler? | drop in superheater outlet temperature associated with a higher than normal boiler water level |
| 45. under what conditions is it advisable to blow down a boler water level gauge glass? | when the water level displayed is erratic or different from the remote level indicators when the water level is sluggish to respond to level changes whenever there is doubt as to the actual boiler water level |
| 46. what are the proper valve positions for a main boiler water level gauge glass during normal boiler operation? | upper root valve open lower root valve open drain valve closed |
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