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Marley
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Sigma Steel Cooling Tower
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Specifications: Options
24
Convenience and Safety Options
Stairway:
9.3 Replace paragraph 9.3 with the fol-
lowing: A 30" wide, 45° steel stairway
with 8" rise and run, shall be provided
at the tower endwall rising from grade
(roof) to the fan deck elevation. Stair
treads shall be bar grating with checker
plate nosing, and shall be through
bolted to structural channel string-
ers. Stairway posts, guardrails and
toeboards shall be as specified per
Paragraph 9.2. Structural steel sup-
port columns for the stairway shall be
provided by the cooling tower manu-
facturer. Stairway foundation shall be
by others, designed in accordance with
drawings provided by the cooling tower
manufacturer. The entire stairway shall
be hot-dip galvanized after fabrication
and shall conform to OSHA standards.
Plenum Walkway:
9.1 Add the following to the end of this
paragraph: Provide a 30" wide bar grat-
ing walkway extending from one endwall
access door to the other in each cell. This
walkway shall be supported by a galva-
nized steel framework, and the top of the
grating shall be above the cold water basin
overflow level. If the cold water basin is
deeper than 4'-0", the walkway shall be
equipped with 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" above the base of the
ladder to the top of the guardrail sur-
rounding the fan deck.
■ Although they are not necessary for routine operation and mainte-
nance, stairways do provide a safe and comfortable means of access to
the top of the tower that is often overlooked in the initial cooling tower
purchase. They are designed in straight-run or double-back configura-
tions to accommodate your site requirements.
■
This option permits freedom of movement for inspection or mainte-
nance within the tower without the need for wading boots or tower
drainage. It also helps prevent maintenance personnel from damag-
ing submerged accessories in the cold water basin (such as screens,
probes, basin heaters, etc.).
■ Many towers are installed such that the base of the tower is 2'-0" 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 ladder extensions are available in standard 5'-0" and
11'-0" lengths, and will be field-cut to fit.
■
To meet OSHA guidelines, towers whose fan
decks are 20'-0" or more above roof or grade, and
which are equipped with ladders, are required to
have safety cages surrounding the ladders.