inert gas (MIG) welding method.
Weld filler metal shall conform to AWS
A5.18/A5.18M.
2.3.4
Fasteners
Self-tapping screws shall not be used for attachment of shielding.
Power-actuated drive pins shall be zinc-coated steel, Type I, pin size No.
4 to secure steel sheets to concrete surfaces and to light gauge furring
channels. The drive pins shall conform to ASTM A 227/A 227M Class 1 for
materials and ASTM B 633 for plating.
2.3.5
Miscellaneous Materials and Parts
Miscellaneous bolts and anchors, supports, braces, and connections
necessary to complete the miscellaneous metal work shall be provided. The
necessary lugs, rebars, and brackets to assemble work shall be provided.
Holes for bolts and screws shall be drilled or punched. Poor matching of
holes will be cause for rejection. Thickness of metal and details of
assembly and supports shall provide ample strength and stiffness. The
materials shall be galvanically similar.
2.3.6
Penetrations
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NOTE: Configure the facility to minimize the number
of metallic structural elements required to
penetrate the barrier.
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Penetrations of the shield, including bolts or fasteners, shall be sealed
with puddle welds or full circumferential EM welds. Structural
penetrations including beams, columns, and other metallic structural
elements shall be provided with continuously welded or brazed seams and
joints between the penetrating element and the shield. Nonmetallic
structural elements shall not penetrate the electromagnetic barrier.
2.3.7
Penetration Plates (Welded Construction)
The penetration plate shall be the central location for treatment of
penetrations. The panel shall be constructed of 6 mm 1/4 inch thick ASTM A
36/A 36M steel plate welded to the shield. Waveguide, conduit, and piping
penetrations shall be circumferentially welded at the point of penetration
to the inner surface of the penetration plate. Penetration plates shall
extend at least 150 mm 6 inches beyond all penetrations.
2.3.8
Floor Finish
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NOTE: Indicate or specify whether other flooring is
to be provided or higher floor loads are required.
This is most critical when raised floors are
specified. Allowances must be made for elevated
door thresholds. Specify special requirements for
laboratory loads, provide seismic requirements, if a
Government designer is the Engineer of Record, and
show on the drawings. Delete the inappropriate
bracketed phrase. Sections 13080 and 15070A,
properly edited, must be enclosed in the contract
documents.
SECTION 13095A
Page 18
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