12 important things should know during boiler walk down check up - ASKPOWERPLANT

12 important things should know during boiler walk down check up

boiler walk down check up before startup of boiler
BOILER OPERATION
1

12 important things should know during boiler walk down check up:-

Walk down check up is  very important activity before boiler cold startup .in this activity boiler shift in charge or boiler 1st class attendant is included they insured that no shut down material , or which things those are used in boiler inside or outside for boiler maintenance purpose are not left at boiler which causes any harm in future and also check out the boiler auxiliaries running condition or not. In this article we are discussed about the boiler walk down check up importance briefly. Boiler start-up can be termed as cold start-up when there is no pressure or when pressure is less than 2 Kg/cm2 (g) in the steam drum.

In a cold start up, possibilities of some inspection or maintenance works having been done is presumed. A walk down check is required and the boiler and its auxiliaries are to be prepared for a start up from the control room. Before a walk down check ensure that all work permits have been returned, safety tags are removed and maintenance permission for boiler start up is available.

Following sequence  to be followed to bring the boiler into service during cold start up.

Using powerful torches or low voltage inspection lamps inspect the furnace, other generating sections, auxiliaries, flue and air ducting of the boiler and ensure the following:

12 important things should know during boiler walk down check up:-

  1. Check out the Furnace, Super heater areas are clear, all maintenance personnel have been removed and no scaffolding materials or inspection devices have been left inside.
  2. Check out the Furnace floor are scraps , water walls panel, enclosure panels are clean and there is no evidence of any water leakage, slag, soot particles or any other deposits.
  3. Check out the Steam drum internals is properly cleaned and manholes should be properly closed with the help of suitable gland rope or asbestoses rope .
  4. Check out the furnace wall ring drain header valves are in closed position.
  5.  check out the wing walls and super heaters header drain walls are in open position and vent in closed positions.

 6.  check out the isolation valves from furnace and super heated drain header to the                 blow down tank are open.

  1. Check out the all access doors, inspection doors of furnace and wind box are tightly closed.
  2. Check out the all peepholes has been tightly closed and sealing/ cooling air connections are intact and the air valves are open.
  3. Check out the air duct, wind-box, economizer, air pre-heater, dust collecting equipment’s and flue gas ducts are clear and that all maintenance personnel have been withdrawn. Ensure that the manhole doors closed properly.

 10 .check out the safety valves are not gagged. Gagged of safety valve should be removed            after hydro test.

  1. Check out the illuminators of local level gauges are ‘ON’ of steam drum. Inlet valves from steam and waterside is open and their drain valves are closed. Insure that the drum gage glass are show accurate drum level which show in the desk of control room .
  2. Check out the nitrogen purging valves are open (connected to the steam drum and main steam piping). If they are open, they have to be closed just before boiler light up, when air vents are opened. If it is given or not . 

 

WALK DOWN CHECK UP ON ECONOMISER

Before cold start up economizer walk down check up is also a very important  activities on boiler before start up of boiler . here we  mentioned some activities  which are helpful . these activities are following :-

-Insure economizer soot/ash cleaning work is completed and economizer main hole is closed with proper sealing insure that any cleaning equipment not left behind by the workers.

Insure that the following vent also opened or closed of economizer :-

*Economizer top header vents closed position.

*Drain valve of top or bottom header should be closed.

After insuring that the all the required drain and vent should be closed or opened condition as per the requirement of operation of stem drum or super heater and main steam line . after the above following activites our boiler inspection work has been completed . Boiler 1st class attendant give the clearance for the boiler auxiliaries trail like I.D , F.D , P.A & S.A fans .

And also for the fuel feeding system all belt conveyers and for the all condition which are required for the boiler start up. Boiler light up is the process of team effort which every person is responsible for the successful light of the boiler. so every person take his responsibility seriously and play a very important role of boiler light up.

 

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