inspection doors, safety valves, valve packing, and equipment requiring
access every two years or more. Provide platforms accessible by ladders.
Provide not less than two avenues of escape from safety valves or other
hazardous equipment.
2.9.1.3
Class 3
Infrequent maintenance access areas, where access is required for painting,
reinsulation, or replacement of components which have a service life of 10
years or more. Provide area to erect temporary scaffolding, ladders,
platforms, and safety nets. Provide rotating machinery and mechanical
equipment components weighing greater than 91 kg 200 pounds with lifting
lugs and provide monorails to remove and lower the equipment to grade in a
single lift.
2.9.2
Interior Access Provisions
Provide minimum 5 mm 3/16 inch ASTM A 36/A 36M manholes, inspection doors,
and access doors to allow interior access to the hoppers, manifolds,
ductwork, bags, and tube sheet. Access openings shall have gas-tight,
insulated, externally hinged, ethylene propylene terpolymer (EPDM) gasketed
doors with 13 mm 1/2 inch diameter smooth hand holds above the inside and
outside of each door. Hinges shall support the doors when open. Provide
safety chains to allow doors to be cracked slightly open before opening
completely and padlocks to allow padlocking doors in the open position.
Additional requirements are as follows:
2.9.2.1
Access to Hoppers
Provide each hopper with one quick-opening, minimum 610 mm 24 inchdiameter
manhole having an access door as specified in the above paragraph.
Interlock hopper access doors to level detectors to prevent access when the
nuclear level detectors are operational. Provide 13 mm 1/2 inchdiameter
smooth hand holds inside each hopper, every 460 mm 18 inches down the side
of the hopper to the bottom, to serve as a ladder.
2.9.2.2
Access to Manifolds and Ductwork
Provide at least one quick-opening, minimum 610 mm 24 inch diameter manhole
or one quick-opening minimum 460 by 610 mm 18 by 24 inchinspection door at
the inlet manifold, the outlet manifold, and at ductwork areas greater than
[_____] meters feet in length. Provide either a quick-opening, minimum 610
mm 24 inch diameter manhole or a quick-opening minimum 460 by 610 mm 18 by
24 inch inspection door at both sides of dampers, expansion joints, and
both sides of gas distribution devices. The doors shall be as specified in
the above paragraph.
[2.9.2.3
Access to Reverse Air System Bags
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NOTE: Select the applicable paragraph(s) from the
following:
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Provide each compartment with interior walkways and access doors to allow
access to the bags and both upper and lower bag supports. Interior
walkways shall be minimum 610 mm 24 inches wide with kickplates. Access
doors shall be minimum 508 by 1118 mm 20 by 44 inch with external bolt-down
lugs and safety interlocks, and as specified in the above paragraph. Space
SECTION 15863N
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