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NOTE: Delete references and requirements for raised
platform floor plate or for grating as necessary.
Grating is recommended where snow or ice
accumulation may be anticipated; otherwise, use
floor plate.
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NOTE: Delete references and requirements for raised
platform floor plate or for grating as necessary.
Grating is recommended where snow or ice
accumulation may be anticipated; otherwise, use
floor plate.
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NOTE: Delete last sentence when steel plant only is
specified. Hypochlorinator should be specified for
all plants 4.38 L/s 100,000 GPD capacity and below.
Chlorinator should be specified for all plants 6.57
L/s 150,000 GPD capacity and above. Between 4.38
and 6.57 L/s 100,000 and 150,000 GPD capacity either
is suitable. Selection should be made on basis of
existing station or base practices, local
availability, and comparative costs.
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Walkway(s) and platform(s) shall be provided for access to all plant
components where regular inspection and maintenance is necessary. Bridge(s)
shall be provided to support walkway(s) where necessary. Bridge support
beams shall be of sufficient size to limit deflection to 1/360 of the span.
Walkway(s) and platform(s) shall be skidproof [raised-pattern floor plate]
[grating]. Walkway(s) and platform(s) shall have a double railing not less
than 1.07 m 3 feet 6 inches in height on both sides of the walkway and
around the outside of the operating platform; railing shall be structural
steel section or of standard 38 mm 1 1/2 inch pipe conforming to ASTM A 53.
Walkway shall be not less than 750 mm 30 inches wide. [Raised-pattern
floor plate] [grating] shall be of a design and material thickness
necessary to keep deflection to less than 6 mm 1/4 inch with a uniform load
of 3.6 kPa 75 pounds per square foot. [Floor plate shall be zinc-coated
steel.] [Gratings shall be zinc-coated steel with zinc coating conforming
to ASTM A 123/A 123M, aluminum conforming to ASTM B 221M ASTM B 221, or
fiberglass.] The maximum weight of each panel shall not exceed 25 kg 55
pounds. Suitable non-metallic insulating spacers shall be provided where
necessary to prevent aluminum and steel from coming into contact. Gratings
shall be secured in place by saddle clips or as recommended by the
manufacturer for easy removal. [Supports in contact with concrete shall be
painted with alkaline-resistant coatings.]
[2.14.2
[Access Stairway] [Access Ladder]
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NOTE: Delete references and requirements for access
ladder as Contractor's option unless it can be
justified on an economic and technical basis.
Although more expensive, a stairway is preferable in
SECTION 11375N
Page 76
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