Chapter 6 Cooling Water System
4.
Heat
Exchanger
_______________________________
3,4JH3(B)(C)E
4-2
Specifications
of
heat exchanger
MODEL
UNIT
3JH3E
Tube dia.
mm
¢,
6 I tf
5X54
Tube
surface area
rn'
0.193
Tube surface area/output
m 0.0048
Fresh water frow
Uhr
4200
Sea water frow €/hr
3800
Fresh water velocity
mis
L21
Sea water velocity
m/s
1.99
4-3
Disassembly and reassembly of the heat
exchanger
{ 1 } Remove the covers on both sides and take out the cool-
ing pipe and O-ring{s}.
NOTE : Replace the 0-ring(s) when you have removed the
cooling pipe.
(2} Remove the filler assembly
4-4
Heat exchanger inspection
(1) Cooling pipe inspection
1)
Inspect the inside
of
the tubes for rust
or
scale buildup
from sea water, and clean with a wire brush
ii
neces-
sary.
NOTE:
Disassemble
and
wash when the cooling water
temperature reaches
85
t'.
2}
Check the joints at both ends of the tubes
for
loose-
ness or damage, and repair
if
loose, Replace ii dam-
aged
or
corroded
3)
Check tubes and replace
if
leaking.
4) Clean any scale or rust off the outside of the tubes.
(2) Heat exchanger
body
inspection
1)
Check heat exchanger body and side cover for dirt and
corrosion. Replace if excessively corroded, or cracked.
2) Inspect sea water and fresh water inlets and outlets,
retighten any joints as necessary and clean the insides
of
the pipes.
3) Check the exhaust gas intake flange and line, and
replace
if
corroded or cracked.
Prinled in Japan
HINSHI-H8009
4JH3E
<f,6/,p5X54
0.347
0.0062
4200
3800
1.11
1.99
(3} Heat exchanger
body
water Leakage test
1) Compressed air/water tank test
Fit rubber covers on the fresh water and sea water in-
lets and outlets. Place the heat exchanger in
a water
tank, feed
in
compressed air from the overflow pipe
and check for any (water) leakage,
(air bubbles}.
Pressure
gauge
/Air
hose
Test pressure
2} Use of the tester
0
0
0
Filler
cap
r------,~
Rubber
cap
Tast
tank
2kg/cm
2
Fit the fresh and sea water inlets and outlets with rub-
ber covers and fill the fresh water tank with fresh
water. Fit a pressure cap tester in place of the pres-
sure cap, operate the pump for one minute and set the
pressure at 1.5kg/cm
2
(21.331b/in.l).
If
there are any
leaks the pressure will
not
rise. If there are
no
leaks
the pressure
wm
not fall.
Pressure
tester
Pressure
gauge
Rubber
cap
Rubber
cap
0
0
6-9
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