Download - Advantage of Fire Tube Boilers
-
8/9/2019 Advantage of Fire Tube Boilers
1/8
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
-
8/9/2019 Advantage of Fire Tube Boilers
2/8
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
-
8/9/2019 Advantage of Fire Tube Boilers
3/8
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
-
8/9/2019 Advantage of Fire Tube Boilers
4/8
%.!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
-
8/9/2019 Advantage of Fire Tube Boilers
5/8
-
8/9/2019 Advantage of Fire Tube Boilers
6/8
(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.
-
8/9/2019 Advantage of Fire Tube Boilers
7/8
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.
-
8/9/2019 Advantage of Fire Tube Boilers
8/8
&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.