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Advantages of Fire Tube Boilers

can use impure water

contains large amount of water, do not requireexact supervision on water level, steam pressure is

steadier.accessible for maintenanceradiation lost is lowercost of maintenance is relatively low

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Disadvantages of Fire Tube Boiler

contains large amount of water, requires longinterval of time raise steam, and are not flexible as

regards to steam demand.more susceptible to explosion, and in such case,

large volume of escaping water flashing into steamupon reaching the atmosphere might cause serious

damage.not capable of producing high temperature and

pressure of steam.lower efficiency

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Emergency Abnormal Condition

1. igh !ater level Chec" and reduce firing rate

#perate blow down system $hrottle feed chec" valve !ater hammering, close steam outlet valve to

prevent damage to pipeline and machinery

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%.!ater &evel 'elow (auge (lass )hut off burner $a"e the boiler out of load Ensure internal damage due to overheating *o not bring up water level in haste until the

boiler parts are cooled down.

+.&arge &ea" !ater level vanishes

'ursting noise *rop in steam pressure lame may be put off by steam

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(rooving found around seams, rivets head or

where the metal has been bent or strained.

0itting local corrosion on boiler water line

larebac" explosion of mixture of oil vapour or

gas in the furnace due to improper purging before

firing the boiler.

!ater Column provides stilling place of the boiler

water during ships rolling.

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Safety Valve Operating TroublesChatter metallic hammering sound or vibratory

noise caused by improper clearance, bent spindle,

looses blowdown rings, improper position of upper

andor lower ad2usting ring position and excessive

bac" pressure.

)immer the first lea"age of steam before the

safety valves pops open, which allowed 1.3 to%4

popping pressure of the valve. 0rolongedsimmering may be due to improper position of

ad2usting rings or distorted valve parts.

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&ea"age constant hissing sound5 damage

seating, foreign in sealing surface.

ang up safety valve fails to reseat due to

improper blowdown, ad2ustment, or mechanical

interference.

!ater hammering caused by condensed water

in the pipeline due to abrupt opening of valves.