2.5.4.4
Alarm System
Incorporate each group of detector units for a single electrostatic
precipitator into the unit alarm system for its respective precipitator so
that a high level in any hopper shall indicate as part of the unit alarm
system.
2.6
ACCESS
2.6.1
Walkways
Provide walkways for inspection and maintenance of discharge electrode
hanger points. Access doors and external walkways shall make routine
inspection tours readily performable. Connect walkways, including roof, by
stairways. Interconnect walkways at each level by walkways at the same
level. Provide caged ladders as a means of secondary egress connecting all
levels.
2.6.2
Doors
Provide every access door with a corresponding exterior walkway connected
to the general system of platforms and walkways. Provide insulated,
hinged, quick opening access, inspection, and clean out doors with gastight
seals. Access doors, including hopper doors, and mechanical and electrical
components shall be easily accessible from the walkway or provide with a
permanent steel ladder or stairway to facilitate maintenance. Provide
internal and external handholds at all access doors to facilitate entry.
2.6.3
Platforms, Walkways, and Ladders
Shop fabricate walkways, stairways, and ladders. Provide access to
openings in both the precipitator and hoppers. Provide walkways in the
casing interior as specified in paragraph entitled "Housing." Provide
walkways, platforms, stairways, ladders, handrails, and kickplates on the
penthouse roof and housing roof, as applicable, and as specified in
paragraph entitled "Penthouse." Design platforms, ladders, and walkways
support steel for live load specified herein. Design platforms to support a
488 kg per square meter 100 pound per square foot live load. Construct
external walkways and platforms of steel conforming to ASTM A 242/A 242M
raised pattern floor plate.
2.6.4
Maintenance
**************************************************************************
NOTE: Provide 227 kg 500 pound crane unless T/R
sets are to be replaced with the crane. If used for
T/R replacement, size for T/R weight.
**************************************************************************
Provide jib crane as required to remove roof-mounted equipment. Load
limits shall be [_____] kg pounds and the jib crane shall be properly
signed for safety showing maximum load permitted.
2.6.5
Hot Dip Galvanizing
Hot dip galvanize platforms, walkways, stairways, ladders, handrails, and
kickplates after fabrication in accordance with ASTM A 123. Minimum
galvanized coating per surface shall not be less than [_____] kg per square
meter ounces/square foot.
SECTION 15862N
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