AUXILIARY BOILER ALARM TESTING ONBOARD

Auxiliary boiler alarm testing onboard is part of the PMS (Planned Maintenance System) which is done on a monthly basis. Alarm testing is one of the important maintenance activity on board as it helps in keeping them in good condition and helping not to cause any kind of breakdown on the auxiliary boiler. It also helps in avoiding any hazards or accidents on the auxiliary boiler. There are many kinds of alarms which are to be tested on the auxiliary boiler which are mentioned below. Some of them also lead to the trip or shutdown of the auxiliary boiler. Testing of alarms for auxiliary boiler also helps in checking the calibration of the transmitter, probe or the float switch that it is working properly or not & it is triggering the alarm for the auxiliary boiler at the set parameter.

Low Oil Pressure in Burner alarm

         Close valve to pressure switch in H.P. F.O. line

         Start boiler manually

         Alarm will sound

         Re-open the valve to pressure switch

Low Oil Pressure in ring line alarm

         Run boiler manually

         Switch stand-by Auxiliary Boiler F.O. Supply pump off

         Switch running Auxiliary Boiler F.O. Supply pump off

         Alarm will sound

         Restart before running pump and switch other pump back to stand-by

Flame Failure alarm

         Run boiler manually

         Pull out the flame eye

         Alarm will sound

         Insert flame eye

Boiler trip alarm

         Switch standby Auxiliary Boiler F.O. Supply pump off

         Switch running Auxiliary Boiler F.O. Supply pump off

         Alarm will sound

         Restart before running pump and switch other pump back to stand-by

Low Water Level alarm (-160 mm)

         Close valve before feed water valve

         Close valves V8 (upper and lower) to differential pressure transmitter

         Slowly open drain valve next to transmitter (near burner unit) on Low level side (left)

         Alarm will sound

         Close drain valve and open valves again

         Open valve before feed water valve

High Water Level alarm (+ 360 mm)

         Close upper valve to differential pressure transmitter

         Slowly open drain valve next to transmitter on High level side (right)

         Alarm will sound

         Close the drain valve again

         Open upper valve

Low-Low Water Level alarm (SB float level switch)

         Close valve before feed water valve

         Close lower and upper valve to SB float level switch

         Slowly open drain under level switch

         Alarm will sound

         First open lower valve again and than upper valve

         Open valve before feed water valve

Low-Low Water Level alarm (PS float level switch)

PS level switch and the low low level from the differential pressure transmitter are connected in series. So set differential pressure transmitter below -160 mm and the drain the PS float level switch. Then the boiler will trip on the low low level alarm.

Low Steam Pressure alarm

         Close valve before pressure transmitter on gauge board

         Loosen nut on the drain valve

         Alarm will sound

         Fasten the nut and open the valve again

Burner Motor Overload alarm

         Open cabinet

         Slide test button on contactor (under transparent plastic) to the left

         Alarm will sound

         Press black RESET button

Oil Booster Pump Overload

         Slide test button on contactor (under transparent plastic) to the left

         Alarm will sound

         Press black RESET button

High Oil Temperature alarm (Aconis)

         Take out PT-100 probe

         Insert into probe tester

         Set probe tester to 160˚C

         Alarm will sound on Aconis

         Take probe from tester and insert in socket again

Low Oil Temperature alarm

         Take out PT-100 probe

         Alarm will sound after a while on Aconis

         Insert probe in socket again

Burner Swing Out alarm

         Unscrew the limit switch at burner door

         Alarm will sound

         Put switch back in place

High Salinity in Feed Water

          Make sure the Feed Water Pump Stop By-Pass is switched to ON (otherwise Feed Water Pumps stops                                                           when alarm is triggered)

          At the hotwell, set the alarm value to a lower setpoint

          Alarm will sound

          Reset the alarm value to the normal setpoint

High Oil Content in Feed Water

          Make sure the Feed Water Pump Stop By-Pass is switched to ON (otherwise Feed Water Pumps stops                                                           when alarm is triggered)

          At the hotwell, on top of the Inspection Tank, open the cover of the sensor and   increase the sensitivity                                                         (yellow potentiometer) until the Red LED is off

          Alarm will sound

          Reset the alarm value to the normal setpoint