RTHD-SVX01L-EN
69
4. Properly connect the lift connection device to the
waterbox. See Figure 39, p. 69. Ensure lift connection
device is securely fastened.
5. Install hoist ring on to the lifting connection on the
waterbox. Torque to 28 ft-lbs (37 Nm).
Figure 39. Waterbox lifting
Connection Device
Cables, Chains or Slings
Waterbox
6. Disconnect water pipes, if connected.
7. Remove waterbox bolts.
8. Lift the waterbox away from the shell.
WARNING
Overhead Hazard!
Failure to follow instructions could result in death or
serious injuries.
Never stand below or in close proximity to heavy
objects while they are suspended from, or being lifted
by, a lifting device in case the object drops.
9. Store waterbox in a safe and secure location and
position.
10. 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.
11. Thoroughly flush the condenser water tubes with clean
water.
Note: To clean internally enhanced tubes, use a bi-
directional brush or consult a qualified service
organization for recommendations.
Reassembly
Once service is complete the waterbox should be
reinstalled on the shell following all previous procedures in
reverse. Use new o-rings or gaskets on all joints after
thoroughly cleaning each joint.
• Torque waterbox bolt in a star pattern. See for torque
values.
Table 18. RTHD Torque
Evaporator
Condenser
65 ft-lbs (88 Nm) 65 ft-lbs (88 Nm)
Table 19. Waterbox weights
Waterbox
Size
(a)
Number
of Water
Passes
Weight kg (lbs)
Standard
Grooved Pipe
Waterbox
(b)
Marine Style
Waterbox
(c)
Evaporator
G 4
164 (361)
NA
G 3
208 (458)
NA
F 3
107 (235)
NA
F 2
107 (235)
NA
D/E 3
91 (201)
NA
D/E 2
110 (243)
NA
B/C 3
76 (167)
NA
B/C 2
91 (201)
NA
B/C 2
73 (160)
NA
Condenser
G 2
102 (226) 297 (655)
E/F 2
66 (146) 239 (526)
B/D 2
53 (116) 187 (412)
(a)
Evaporator size is Digit 14 in the model number. Condenser is Digit 21 in
model number.
(b)
Lifting connection size M12 x 1.75.
(c)
Lifting connection is a lifting lug. Removable cover has a weight of 138 kg
(300 lbs). Lifting lug connection is M12 x 1.75.
Table 20. Connection devices
Unit Product Part Number
RTHD
Safety Hoist Ring
M12 x 1.75
RNG01886
Chemical Cleaning Procedure
Scale deposits are best removed by chemical means.
Consult a qualified water treatment specialist (i.e., one that
knows the local water supply chemical/mineral content) for
a recommended cleaning solution suitable for the job (A
standard condenser water circuit is composed solely of
copper, cast iron and steel). Improper chemical cleaning
can damage tube walls.
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.
Note: Chemical tube cleaning should always be followed
by mechanical tube cleaning.
Cleaning the Evaporator
Since the evaporator is typically part of a closed circuit, it
does not accumulate appreciable amounts of scale or
sludge. However, if cleaning is deemed necessary, use the
same cleaning methods described for the condenser tubes.
Maintenance
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