Table of Contents
Advertisement
R R e e c c o o m m m m e e n n d d e e d d M M a a i i n n t t e e n n a a n n c c e e
water temperature) is higher than predicted.
If the annual condenser tube inspection indicates that
the tubes are fouled, two cleaning methods—
mechanical and chemical—can be used to rid the tubes
of contaminants. Use the mechanical cleaning method
to remove sludge and loose material from smooth-bore
tubes.
To clean other types of tubes including internally-
enhanced types, consult a qualified service
organization for recommendations.
Figure 66. Typical chemical cleaning setup
Pipe
Connections
Circulator
Pump
1. Follow all instructions in
Installation," p. 92
to remove waterbox covers.
2. Work a round nylon or brass bristled brush
(attached to a rod) in and out of each of the
condenser water tubes to loosen the sludge.
3. Thoroughly flush the condenser water tubes with
clean water.
4. Scale deposits are best removed by chemical
means. Be sure to consult any qualified chemical
house in the area (one familiar with the local water
supply's chemical mineral content) for a
recommended cleaning solution suitable for the
job.
N N o o t t e e : : A standard condenser water circuit is
composed solely of copper, cast iron, and
steel.
N N O O T T I I C C E E
U U n n i i t t C C o o r r r r o o s s i i o o n n D D a a m m a a g g e e ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w i i n n s s t t r r u u c c t t i i o o n n s s b b e e l l o o w w c c o o u u l l d d r r e e s s u u l l t t i i n n
c c o o r r r r o o s s i i o o n n d d a a m m a a g g e e t t o o t t h h e e u u n n i i t t a a n n d d t t u u b b e e s s . .
F F o o l l l l o o w w p p r r o o p p e e r r p p r r o o c c e e d d u u r r e e s s w w h h e e n n u u s s i i n n g g c c o o r r r r o o s s i i v v e e
c c h h e e m m i i c c a a l l s s t t o o c c l l e e a a n n w w a a t t e e r r s s i i d d e e o o f f u u n n i i t t . . I I f f u u n n s s u u r r e e , , i i t t
i i s s r r e e c c o o m m m m e e n n d d e e d d t t h h a a t t t t h h e e s s e e r r v v i i c c e e s s o o f f a a q q u u a a l l i i f f i i e e d d
c c h h e e m m i i c c a a l l c c l l e e a a n n i i n n g g f f i i r r m m b b e e u u s s e e d d . .
90
Shutoff
Valves
Cleaning
Solution
"Waterbox Removal and
I I m m p p o o r r t t a a n n t t : : All of the materials used in the external
circulation system, the quantity of the
solution, the duration of the cleaning
period, and any required safety precautions
should be approved by the company
furnishing the materials or performing the
cleaning. Remember, however, that
whenever the chemical tube cleaning
method is used, it must be followed up
with mechanical tube cleaning, flushing,
and inspection.
Evaporator
Since the evaporator is typically part of a closed circuit,
it may not accumulate appreciable amounts of scale or
sludge. Normally, cleaning every three years is
sufficient. However, periodic inspection and cleaning is
recommended on open evaporator systems, such as air
washers.
Waterbox and Tubesheet Protective
Coatings
Trane recommends that coated waterboxes/tubesheets
—regardless of the type of protective coating included
—be taken out of service within the first one to three
months of operation for inspection. Any voids or
defects identified upon inspection must be repaired. If
the water quality is known to be highly supportive of
corrosion (i.e., sea water, etc.), inspect the coating
system at one month; if the water quality is known to
be relatively benign (i.e., normal treated and clean
condenser water), inspect the coating system within
three months. Only when initial inspections show no
problems are present should subsequent maintenance
intervals be increased.
Sacrificial Anodes
The replacement schedule for the optional zinc or
magnesium anodes can vary greatly with the
aggressiveness of the water that is in the system. Some
sites could require anode replacement every two to
three months while other sites may require anode
replacement every two to three years. Trane
recommends inspection of anodes for wear sometime
within the first several months of the anodes being
placed into service. If the observed loss of anode
material is small, then the interval between subsequent
inspections can be lengthened. Replace the anode and/
or shorten the inspection interval if the anode has lost
50 percent or more of its original mass. If anode
depletion occurs very quickly, consult a water
treatment specialist to determine if the anode material
selected is correct for the application.
CDHF-SVX01N-EN
Advertisement
Table of Contents
