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Marley
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Sigma F Series Cooling Tower
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Specifications: Options
22
Specification Value
Plenum Walkway:
9.1 Add the following to the end of this
paragraph: Provide a 30" (762 mm)
minimum wide walkway extending
from one endwall access door to the
other through the length of the tower.
Walkway shall be constructed of
fiberglass components with a nonskid
surface on floor members, and the top
of the walkway shall be above the cold
water basin overflow level. If the cold
water basin is deeper than 4'-0" (1.22
m), the walkway shall be equipped
with fiberglass guardrails.
Ladder Extension:
9.4 Add the following paragraph in the
Access and Safety section: Provide
a ladder extension for connection to
the base of the ladder attached to
the tower casing. This extension shall
be long enough to rise from the roof
(grade) level to the base of the tower.
Anchorage and lateral bracing of the
ladder extension shall be by others.
Ladder Safety Cage:
9.3 Add the following to the end of this
paragraph: A heavy gauge galvanized
steel safety cage shall surround the
ladder, extending from a point approxi-
mately 7'-0" (2.13 m) above the base
of the ladder to the top of the guardrail
surrounding the fan deck.
Hot Water Basin Covers:
7.4 Add the following paragraph in
the Hot Water Distribution System
section: The distribution basins shall
include stainless steel covers. These
covers shall be designed to withstand
40 psf (1.92 kPa) live load, and shall be
easily removable for maintenance.
■ This option permits freedom of movement for inspection or main-
tenance within the tower without the need for wading boots or
tower drainage. It also helps prevent maintenance personnel from
damaging submerged accessories in the cold water basin (such
as sump screens, probes, basin heaters, etc.).
The need for guardrails where basins are deeper than 4’-0” (1.22
m) is an OSHA requirement.
■ Many towers are installed such that the base of the tower is
2’-0” (610 mm) or more above the roof or grade level. This makes
it difficult to get up to the base of the attached ladder. The ladder
extension alleviates this problem. Marley's ladder extensions are
available in standard 5’-0” (1.52 m) and 11’-0” (3.35 m) lengths,
and will be field-cut to fit.
■ To meet OSHA standards, towers whose fan decks are 20’-0”
(6.10 m) or more above roof or grade, and which are equipped
with ladders, are required to have safety cages surrounding the
ladders. Their use on lower elevation towers is a matter of choice.
■ These covers are designed to keep leaves and debris out of the
circulating water system. They also serve to suppress algae for-
mation by shielding the incoming hot water from direct sunlight.