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Marley
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Sigma Steel Cooling Tower
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Specifications: Options
25
Oil Level Sight Glass:
5.4 Replace paragraph 5.4 with the fol-
lowing: A galvanized oil gauge and
drain line shall extend from the gear
reducer to the vicinity of the motor,
and shall be equipped with a bronze-
bodied oil level sight glass.
Miscellaneous Options
Steel Cold Water Basin:
10.1
Replace paragraph 10.1 with the fol-
lowing: Include a cold water collection
basin constructed of 12 gauge hot-dip
galvanized formed steel sheets. These
sheets shall be bolted, gasketed and
caulked to form a watertight basin 18"
deep. A depressed, side outlet sump shall
be included, having a 1/4" thick faceplate
drilled for a standard 125# flange connec-
tion. An appropriately sized (3" diameter
or larger) galvanized standpipe overflow
shall be provided. The standpipe shall be
removable for flush-out cleaning of the
basin. A float-operated, mechanical make-
up valve shall also be included, installed
adjacent to the endwall access door.
Factory Mutual Approval:
3.5 Add the following paragraph in the
Construction section: The tower shall
include all design and material modi-
fications necessary to meet the fire
ratingrequirementsofFactoryMutual.
The product proposed shall be listed in
theFMApprovalGuide,latestedition.
Hot Water Basin Covers:
7.3 Add the following paragraph to
the Hot Water Distribution System
Section: The distribution basins shall
include galvanized steel covers. These
covers shall be designed for a uniform
live load of 40 psf, and shall be easily
removable for maintenance.
Air Inlet Screens:
8.3 Add the following paragraph to the
Casing Section: The air inlet faces of
the tower shall be covered by 1" mesh
hot-dip galvanized welded wire screens.
Screens shall be mounted in galvanized
steel U-edging and shall be removable.
■
The oil level sight glass is a convenience item that is preferred by many
users. The same purpose is, of course, served by either the dip stick or
the sight glass.
■ Marley basins are used to permit the installation of towers on elevated
platforms or foundations.
This is the simplest of several cold water basin designs available for
the Sigma Steel towers. Because of its bolted construction, it has the
advantage of being hot-dip galvanized after fabrication. Marley can
also install a 10 gauge welded stainless steel basin for a Stainless Steel
Sigma. See 24.
■
This could have a very beneficial effect
upon your fire insurance premiums.
Towers not able to meet FM require-
ments may require the inclusion of a fire
protection sprinkler system to achieve a
comparable level of insurance premium
cost.
■
These covers are designed to keep leaves and debris out of the circu-
lating water system. They also serve to suppress algae formation by
shielding the incoming hot water from direct sunlight.
■ In wooded or windy areas, these screens help to keep leaves or blow-
ing debris out of the cooling tower and circulating water system.