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Name: Patrick Edwards

Raising steam from a cold condition

When commencing the start- up operation for boilers under condition

the following observations must be made;

If the boiler was taken off line and inspected or repaired were

done tools must be replaced, examine all pipe lines to ensure

that work that was done on then were completed and ensuring

that all fittings were done and properly fitted.

Fit lower manhole cover

Check that the blow down valve is clear.

Check internal fittings if they are correct.

Remove all blanks from the pipe lines are removed and other

area that were blocked off.

Fill the boiler 1 quarter way using warm water if possible, apply

first treatment with feed water through the top manhole;

ensuring that air vent is opened.

Set 1 fire at lowest rate possible; using smallest burner available,

by- passing air heater if fitted. Change furnaces over everytwenty minutes.

After about an hour start circulation by feed pump and blow

down valve connection (if no means of circulation is available

continue to apply low fire rate until boiler throughout the

furnace).

Continue to circulate for 4 hours if there is no method of natural

circulation is available to promote the removal small amount of

water, rising the temperature of the boiler at a rate of 6-7degrees c per hour.

At the end of this set away all furnaces, but still at the slow rate

but at this time close all air vents

Nipping up all bolts and all new joints.

7/27/2019 Raising Steam From a Cold Condition

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Name: Patrick Edwards

Stop circulation and steam pressure can be slowly increased

during the 7-8 hours within 100kN/m square.

Test the water gauge. The boiler is ready for operation.

About 12-hours must be allowed for the completion of thisoperation if means of circulation is provided.

Raising steam under hot condition

The conditions that must be observed when raising steam under these

conditions which indicates low superheat conditions are as follows;

For higher steam temperatures it is placed above 2 rows of screen

tubes in a position known as interdeck position, and as many rows of

generation tubes to produce the required superheated temperature.The quality of steam produced is dependent up the width of the super

heater.

Superheated temperature with be below 455 degrees c, the final

superheated condition is dependent upon the presence of fitted

controlled dampers in the gas baffles to regulator the gas flow over the

superheater.

7/27/2019 Raising Steam From a Cold Condition

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Name: Patrick Edwards

Operation to follow after the burner as failed

In the initial condition if the burner fails to start after 10 second after

the failure as occurred via the spark or other method, initial igniter safety

shut off valves must be closed and failure problem corrected. If air flow is

maintained at purge rate then re-purge is not necessary. There must be at

least 1 minute lapse before retrial of the re-start process is attempted.

The continual re-start process without carrying out inspections and

checks is prohibited; each burners must be observed independently and any

loss of flame must result in the immediate closure of the shut off valve.