Innovation - Edge [i] Installation, Operation, Maintenance Manual
CHAPTER 6
– MAINTENANCE
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9/6/2019
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6.8.2 Waterside Inspection
Inspection of the heat exchanger tubes and tubesheet area is done using the two
2” NPT
inspection ports, in the upper and lower sections of the shell, as shown in Figure 6.8.2.
Waterside Inspection Instructions
1.
Disconnect the electrical power to the unit.
2.
Close the water inlet, water outlet, and recirculation shut-off valves to the unit.
3.
Open the upper drain valve, to allow air to enter the chamber, then open the lower drain valve
and allow all water to drain from the shell.
4.
Remove the lower
2” NPT plug (a little additional water may flow from the port).
5.
Use a boroscope, or a camera and flashlight, to inspect and take photos of the visible tubes
and tubesheet area.
6.
If sediment and deposits exist on the lower tubesheet, and/or there is a buildup of scale
deposits, follow instructions (Section 6.8.3) for descaling and flushing the unit to remove
excess debris.
7.
Remove the upper NPT plug and repeat the inspection, looking for signs of scale buildup or
other damage in the upper portion of the shell.
Figure 6.8.2: Waterside Inspection Port Locations
LOWER DRAIN VALVE
LOWER
INSPECTION PORT
UPPER
INSPECTION
PORT
UPPER DRAIN VALVE
RIGHT-SIDE VIEW
FRONT-LEFT VIEW