IDC INDUCED DRAFT EVAPORATIVE CONDENSERS
MAINTENANCE
S140-500 IOM (FEB 08)
Page 23
Figure 4-6. Spray Header Nozzle Orientation
removed. If there is evidence of scale buildup on the coil,
check the bleed valve for adequate bleed-off. If the bleed-off
valve is functioning properly, contact your local water treat-
ment company for recommendations.
Pan-Water Electric Level Control Packages
Inspect Stilling Chamber for obstructions every three
months.
4.11 Protective Finish
Standard IDC units are protected by a thick layer of hot dip
galvanizing. it should be part of the maintenance program
to annually inspect and “touch-up” any signifi cant scratches
that may penetrate the heavy layer of Zinc protection. Deep
scratches should be cleaned of any surface soil, grease, etc.,
and then coated with a “zinc-rich” cold galvanizing compound
or Zinc solder.
If surrounding components will not be damaged by fl ame-lev-
el heat, a blowtorch can be used to slowly heat the scratch
to the melt point of a Zinc solder rod. Apply the Zinc until it
smoothly fl ows over the scratch. Discontinue torch application
and quickly use a manual wire brush to spread the molten
Zinc evenly over the damaged area.
Care must be taken not to use this technique near any heat
sensitive bearings, belts, mastic seals, etc. A “hot work” ap-
proval should be obtained from the work area’s designated
Safety Offi cer before conducting the procedure.
Special units constructed from Stainless Steel components
generally do not require “special care” to maintain normal
corrosion protection. However, Stainless Steel units should
be protected from direct exposure to caustic or acidic
chemicals.
All units should be cleaned as local conditions require. Also,
periodic inspections for structural or component damage
from wind, lightening, or freezing weather will help maximize
the unit’s life.