combination of flexible and carbon steel pipe. Flexible and rigid
hydraulic line working pressures shall exceed the maximum system relief
pressure. [PVC pipe and fittings for burial of hydraulic lines shall be in
accordance with ASTM D 3034 Type PS 46 with minimum pipe stiffness of 46.]
a.
Flexible hydraulic lines shall be in accordance with SAE J517.
b.
Rigid hydraulic lines shall be seamless carbon steel pipe in
accordance with ASTM A 106/A 106M.
2.2.1.5
Hydraulic Power Unit Enclosure
A NEMA Type 3R enclosure as specified in NEMA 250 shall be provided to
enclose the hydraulic power unit. The enclosure shall be designed for easy
removal of the hydraulic power unit and other accessories without complete
removal of the enclosure. An access door with hinges and an inside and
outside operable/lockable (exterior) door latch shall be provided.
Equipment within the enclosure shall be placed and configured so that all
periodic maintenance can be performed through the access door without
removal of the equipment. The enclosure shall be equipped with
weatherproof louver vents appropriately sized and located to dissipate
internal heat generation.
2.2.2
Manual Retractable Bollards
Manual bollards shall be capable of being raised and lowered utilizing a
recessed handle on the top surface of the bollard or a manual hydraulic
pump, either requiring a maximum 267 N 60 pounds of force. A mechanism,
that is lockable, shall be provided to secure the bollard in either the
full "UP" or full "DOWN" position.
2.3
CRASH GATE
The crash gate shall consist of steel buttresses anchored into the ground
and an above grade assembly consisting of a heavy steel structure or a
combination of heavy steel and structural aluminum capable of being opened
and closed. The height of the gate shall be a minimum of [2.1] [_____] m
[84] [_____] inches from the road surface to the top of the gate frame.
The length shall close and protect a minimum [3.0] [_____] m [120] [_____]
inch clear opening. The maximum clear opening between the gate frame and
end posts, between the bottom of the gate and finished grade, and between
any grill work shall be 75 mm 3 inches.
2.3.1
Powered Crash Gate
The gate movement shall be controlled by [an electro-mechanical gate
operator] [a hydraulic gate operator] consisting of an operator unit with
required control circuits and operator station. The control and operating
voltage shall be 24 vac (nominal)or, as an option 24 vdc. A remote control
master station shall be capable of driving the gate at [[_____] m per
second fpm] [[_____] degrees per second] for a swing gate. Unless
otherwise indicated, motors shall have [drip-proof] [totally enclosed]
enclosures. Crash gate shall withstand a 6804 kg 15,000 pound vehicle at
impact speed of [48] [64] [80] km/hour [30] [40] [50] mph, with maximum
barrier deflection or vehicle penetration of [_____] m feet.
2.3.1.1
Failure Mode of Operation
The system shall be designed to prevent opening of the crash gate in the
SECTION 02840
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