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ESW4 Closed Circuit Coolers
Prior to lowering the fan section onto the casing section, the side flanges on the casing sections must be cleaned by the installer
and have sealer tape applied to them. The ends will need to have 2 overlapping layers of sealer tape applied to them. Follow
instructions from the “Application of Sealer Tape” section of this manual.
Drift pins should be used to align the fan section with the casing section. The installer will need to attach the fan section end panels
to the casing section end panels and the fan section side panels to the casing section side panels with self-threading tappers
(galvanized units) or bolts (stainless units).
Note: Fan screen and fan screen support will be shipped loose in the event of a 3-section shipment. Both these items
need to be installed after rigging.
Assembly of the Top Section to the Bottom Section
Before securing the upper section to the bottom section, remove any loose parts shipped in the basin.
Wipe the flanges on the bottom of the upper section. Check to see that the water distribution connection on the top section is in the
correct position relative to the bottom section (see unit certified drawing). Units are also provided with match markings on each
section (i.e. A1 of bottom section should match up with A1 of top section).
Lower the upper section to within several inches of the bottom section making sure the two sections do not touch and the sealer
tape is not disturbed. Fasten all four corners. Make use of drift pins to simplify the fastening process.
Install the remaining fasteners, working from the corners towards the center. Fasteners must be installed in every hole in the side
flanges. No fasteners are required on the end flanges.
Use of Drift Pins for Final Positioning
Drift pins are tools used to align holes in the flanges of the upper and lower sections of the unit prior to final fastening. By the time
drift pins are needed, the lower section of the unit has already been anchored to its support structure. The sealer tape has been
laid down on the lower section’s flanges, and the upper section is now hovering over the lower section.
A drift pin should be driven in to each of the corner bolt holes such that the upper and lower flanges are aligned as best as possible
with sideways motion restricted.
On units which are longer than 12’ (3.6m) (“L” > 12’ (3.6m)), a drift pin should be used at an intermediate pair of bolt holes in the
rigging seam to allow for proper alignment.
Notes:
Bolts can be driven upward through the mating flanges if access is restricted.
All rigging hardware is provided by EVAPCO. Drift pins are by others.
