Specifications

Specifications
Specification Value
MH Fluid Cooler — Specifications: Options
17
ing. The guardrail assembly shall be hot
dipped galvanized after welding and
capable of withstanding a 200 lb con-
centrated live load in any direction. Posts
shall be spaced on centers of 8'-0" or
less. A 1'-6" wide aluminum ladder with
3" I-beam side rails and 1.25" diameter
rungs shall be permanently attached to
the endwall casing of the tower, rising
from the base of the fluid cooler to the
top of the guardrail.
Distribution Basin Access Platform:
11.2 Add the following paragraph in the
Access section: Provide an external plat-
form near the top of the louver face for
access to the hot water distribution sys-
tem. The platform shall be heavy gauge
galvanized steel with safety grip perfo-
rations, supported by galvanized steel
framework attached to the fluid cooler.
The platform shall be surrounded by an
OSHA compliant guardrail system welded
into subassemblies for ease of installa-
tion. A permanently attached 1'-6" wide
aluminum ladder with 3" I-beam side rails
and 1.25" diameter serrated rungs shall
extend from the base of the fluid cooler
to the top of the guardrail.
Ladder Extension:
11.2 Add the following to the end of para-
graph 11.2: Provide a ladder extension
for connection to the foot of the ladder.
This extension shall be long enough to
rise from the roof (grade) level to the
base of the fluid cooler. The installing
contractor shall be responsible for cut-
ting the ladder to length; attaching it to
the foot of the fluid cooler ladder; and
anchoring it at its base.
Ladder Safety Cage:
11.3 Add the following paragraph in the
Access section: A heavy-gauge alumi-
num safety cage welded into subassem-
blies for ease of field installation shall
surround the ladder, extending from a
point approximately 7'-0" above the foot
of the ladder to the top of the guardrail
surrounding the fan deck or platform.
Maximum weight of welded subassem-
blies shall not exceed 20 lb for ease of
installation.
■ Periodic inspection and maintenance of a fluid cooler distribution system is
fundamental to preserving maximum cooling system efficiency. All fluid cool-
ers—crossflow or counterflow—are subject to clogging to varying degrees by
waterborne contaminants such as pipe scale and sediment. Therefore, safe and
easy access to these components is of significant value to the operator.
Access can be provided in a number of ways, including portable ladders or
scaffolding, but for maximum safety and convenience, a field installed Marley
access platform with guardrails is available to make this task as safe and user-
friendly as possible. Further, its location on the side of the tower does not add
to the height of the unit, preserving architectural integrity. It also saves the
owner time and money, in that maintenance personnel may devote their time to
inspection rather than searching for ladders or erection of portable scaffolding.
■ Many fluid coolers are installed such that the base of the unit is 2'-0" or more
above the roof or grade level. This makes it difficult to get up to the foot of the
attached ladder. The ladder extension alleviates this problem. Marley ladder
extensions are available in standard 5'-0" and 11'-0" lengths.
■ To meet OSHA guidelines, towers whose fan decks are 20'-0" or more above
roof or grade, and which are equipped with ladders, should have safety cages
surrounding the ladders, but with approximately 7'-0" clear headroom.