2.1.4.1
Finger-Stock (Contact Finger)
Contacts shall be copper beryllium, phosphor bronze, or stainless steel
finger-stock (contact finger) conforming to ASTM B 194. Finger stock shall
be secured to the HEMP shielded door or frame without using special tools
or adhesives and shall have a minimum of [50] [_____] mm [2] [_____] inches
of overlap. Door RF seals shall, after [10,000] [_____] cycles of opening
and closing, continue to provide SA specified in MIL-STD-188-125 and
sealing components shall not need to be replaced.
2.1.5
Door and Frame Assembly
Provide each type of HEMP shielded door as an assembly with a frame that
shall be welded into place in the primary shield. Accurately position door
in frame.
2.2
HINGES
Provide each type of HEMP shielded door except the sliding type with a
minimum of three well balanced, adjustable sealed ball bearing or
adjustable radial, thrust-bearing hinges suitable for equal weight
distribution of the HEMP shielded door. Hinges shall allow adjustment in
two directions. Force necessary to set the HEMP shielded door in motion
shall comply with NFPA 101. Provide lubricating fitting at each hinge
unless not required by the design of the hinge or the bearing.
2.3
HARDWARE AND ACCESSORIES
The door manufacturer shall provide all hardware and accessories including
electrical filters if required.
2.3.1
Power Assist
Should HEMP shielded door mechanism preclude the manual operation of the
HEMP shielded door with a specified maximum pull (force) of [156] [_____]
Newton [35] [_____] pounds to set the HEMP shielded door in motion, provide
a power assist system to meet the [156] [_____] Newton [35] [_____] pound
requirement. Install power assist system in such a manner that the clear
opening of the door is not obstructed. Provide redundant compressed air
system. Provide emergency power to the control and redundant compressed
air system.
Power assist system shall include the following:
a.
Pressure regulator and air control valve to control the speed and
direction of the door.
b.
Provide pneumatic mechanism to power assist.
c.
Air control valve operable from inside or outside.
d.
Allowance for manual operation within [15] [_____] seconds should
loss of air pressure occur.
2.3.2
Threshold Protectors
Provide threshold protectors for each of the HEMP shielded door.
Protectors shall consist of portable ramps that protect the threshold when
SECTION 13095N
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