km/hour (30 mph), 64 km/hour (40 mph), or 80 km/hour
(50 mph) with penetration of less than 6 m (20
feet). Or Department of the Navy impact condition
of a 4535 kg (10,000 pound) traveling at 24 km/hour
(15 mph), with penetration of less than 3 m (10
feet).
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The crash beam shall be an above-grade assembly that, in the "DOWN"
position, shall present a visible obstacle to approaching vehicles. The
height of the barrier shall be a minimum of 750 mm 30 inches as measured
from the roadway surface to the centerline of the crash beam. The crash
beam shall be capable of blocking a minimum road width of [3.0] [_____] m
[120] [_____] inches. The crash beam end shall contain a locking pin with
padlock acceptance for securing the crash beam when it is in the "DOWN"
position. Crash beam shall withstand a [6804 kg 15,000 pound vehicle
traveling at [48] [64] [80] km/hour [30] [40] [50] mph, with maximum
vehicle penetration of 6 m 20 feet] [4535 kg 10,000 pound vehicle at impact
speed of 24 km/hour 15 mph, with a maximum vehicle penetration of 3 m 10
feet].
2.4.1
Powered Crash Beam
The crash beam shall be operated by means of a hydraulic power system. The
crash beam shall be capable of being raised or lowered within an 8 to 15
second time range.
2.4.1.1
Failure Mode of Operation
A disconnect system for the crash beam shall be provided to allow manual
operation of the barrier in the event of an electrical or mechanical
failure.
2.4.1.2
Hydraulic Power Unit
**************************************************************************
NOTE: Retain and edit or delete paragraph based on
type of operator chosen.
**************************************************************************
The hydraulic power unit shall contain synthetic biodegradable hydraulic
fluid which maintains its viscosity operatin range, even at constant
heaviest use rate, for an ambient temperature range of [minus 7 to plus 66
degrees C 20 to 150 degrees F] [[_____] to [_____]]. A hydraulic fluid
heater shall be provided so that the viscosity remains within its operating
range if ambient temperatures below minus 7 degrees C 20 degrees F are
expected. Buried hydraulic lines for the connection of the hydraulic power
unit to the barrier shall be flexible or carbon steel pipe or a 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.
SECTION 02840
Page 16
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