that it provides safer and easier access to
platforms and walkways.
**************************************************************************
**************************************************************************
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
that it provides safer and easier access to
platforms and walkways.
**************************************************************************
**************************************************************************
NOTE: Delete "raised platform floor plate" or
"grating" as necessary. 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.
**************************************************************************
**************************************************************************
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
that it provides safer and easier access to
platforms and walkways.
**************************************************************************
When top of plant is more than 600 mm 24 inches above surrounding ground
level, an access stairway [or ladder] shall be provided. Stairway shall be
fabricated of structural steel members. Steps shall be [raised-pattern
floor plate] [grating]. [Access ladders shall be of steel or aluminum and
shall be 450 mm 18 inches wide minimum, with step bars spaced 300 mm 12
inches on center. Ladders shall be anchored at bottom and top and
intermediate points with brackets 1.8 m 6 feet apart. Brackets shall be of
same size as side bars and of such length as to hold ladder 150 mm 6 inch
away from walls. Curved returns shall be provided at top of ladder.
Aluminum side bars and step bars shall conform to ASTM B 221M ASTM B 221.]
]2.14.3
Handrails
Handrails shall be provided on stairways, platforms, bridges, and other
points of personnel access for operation and inspection. A handrail shall
be provided around the perimeter of the tank if the top of the exposed side
wall is less than 1.07 m 3 feet 6 inches above grade. Handrails shall be
constructed of structural steel section or of standard 38 mm 1 1/2 inch
pipe conforming to ASTM A 53.
2.14.4
Raw Sewage Recirculation Box
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NOTE: Delete this paragraph when raw sewage
recirculation box is considered unnecessary. When
sewage is pumped to the treatment plant, the use of
a raw sewage recirculation box (which recirculates a
portion of incoming sewage back to the pumping
SECTION 11375N
Page 77
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