points and all parts of equipment requiring routine maintenance, repair or
replacement. Handholds shall be provided inside and outside directly above
each access door. Access doors, and mechanical and electrical components
shall be accessible from a walkway or platform. Complete layout of access
system shall be subject to approval of the Contracting Officer.Provide
supporting steel, grating, handrails, and kickplates electrical lights and
outlets for walkways, stairs and platforms. Arrangement, design, and
fabrication of access systems shall conform to OSHA regulations. Headroom
shall be 2.13 meters 7 foot clear. Provide adequate allowance for
installation of piping, conduit, electrical outlets, and lighting fixtures.
Design exterior walkways and platforms which will be located above ductwork
or other areas requiring insulation and lagging to allow a minimum of 150 mm
6 inches clearance between lagging and bottom of walkway structural steel
assuming that insulation and lagging will be placed on top of ductwork
stiffeners. Stairs, walkways, platforms, and ladders and their vertical
support steel shall be located a minimum dimension of 0.91 m 3 foot from
the outside column row centerline of structures for which the Contractor
will be supplying and installing metal wall panel. Walkways width shall be
0.91 m 3 foot, minimum. Include handrail and kickplates around platforms.
Design access stairs, as specified. Access stairs width shall be 0.91 m 3
foot, minimum. Include handrail along both sides, top rail to be 762 to
813 mm 2 foot 6 inches to 2 foot 8 inches above edge of tread. Stairs
shall be open-riser type. Stair treads shall be as specified. Stairs
shall have a minimum of 229 mm 9 inch tread and a maximum of 203 mm 8 inches
rise. Minimum width of ladders shall be 457 mm 1 foot 6 inches. Rung
diameter shall be 19 mm 3/4 inch. Rungs shall be spaced at 300 mm 12 inch
on centers. Side rails shall be a minimum of 9.53 by 63.50 mm 3/8 by 2 1/2
inch. Exterior ladders and cages shall be hot-dip galvanized after
fabrication in conformance with ASTM A 123/A 123M. Provide gas-tight and
liquid-tight access doors to facilitate entry to parts of the flue gas
cleaning system. Access doors shall be 610 mm 24 inch minimum diameter and
the quick opening type. Access doors shall have ethylene propylene
terpolymer (EPDM) gaskets. Provide access doors with hinges to support
door when open. Provide access doors with external latches and tightening
devices which allow for gasket shrinkage without loss of gas-tight seal.
Provide safety chains on access doors to allow door to be cracked open
slightly before opening completely. Provide a means of padlocking access
doors in the open position. Provide inside and outside handholds directly
above each access door.
2.13.6
Personnel Access Requirements
2.13.6.1
Class 1
Regularly attended areas shall have access operating platforms which are
fully accessible by stairs. No ladder or ships ladders for access will be
permitted. Areas included: Lubricated equipment, bearings, instruments,
valve operators, damper operators, damper linkages and drives, test ports,
instrument connections, and equipment requiring access during operation and
for normal day-by-day inspection and maintenance. Platforms at same
elevation on each side of equipment or building shall have a walkway
connecting the two sides.
2.13.6.2
Class 2
Maintenance access areas such as expansion joints, duct access
doors,
safety valves, valve packing, and other areas requiring access
every two
years or more, shall have access platforms of adequate size to
permit two
people to work, 1.12 meter 12 square feet minimum, with access
ladders and
SECTION 15864N
Page 104
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