during an emergency. Also, the barrier shall be capable of being lowered
from the raised position to the lowered position in not more than 3 seconds.
[Retractable barrier shall withstand a [_____] kg pound vehicle at impact
speed of [_____] km/hour mph with maximum barrier deflection or vehicle
penetration of [_____] m feet].
2.1.1.1
Failure Modes of Operation
The system shall be designed to remain in the last commanded position in
the event of hydraulic, electrical, or mechanical failure. A manual pump,
or other system, shall be included for operation of hydraulic barriers
without power.
2.1.1.2
Unless otherwise indicated, electric motors shall have [drip-proof]
[totally enclosed] [totally enclosed fan cooled] enclosures. All
couplings, motor shafts, gears, and other moving parts shall be fully
guarded in accordance with 29 CFR 1910 Subpart O. Guards shall be
removable without disassembling the guarded unit. For multiple barriers
operated from a single hydraulic unit it is highly recommended that the
electric motor be 3-phase.
2.1.1.3
System
The system shall be designed to maintain the barriers in the raised
position, without inspection, for periods of time of up to 1 week. If a
hydraulic system is used, it shall be equipped with pressure relief valves
to prevent overpressure. The system shall not require continuous running
of the motor to stay in the raised position, excluding the use of manual
pinning to do so.
2.1.1.4
Hydraulic Power Unit
**************************************************************************
NOTE: Based on manufacturer's system layout the
hydraulic platform unit should be located above
ground. The unit should be placed on a reinforced
concrete pad in a prefabricated weatherproof metal
enclosure. Based on EPA requirements, provide a
containment area; i.e., depressed floor or catch
pan, to ensure capture of the total amount of
hydraulic fluid within the hydraulic power unit.
Access door or doors shall be provided to meet the
maintenance requirements of the unit. The physical
location of the unit should be on the protected side
of the area.
The hydraulic oil viscosity must remain within its
operating range, even after barrier non-use. If
ambient temperature drops below -7 degrees C (20
degrees F) then hydraulic power unit shall be
equipped with proper hydraulic oil, hydraulic oil
heater, insulated and heated hydraulic lines, and
underground hydraulic oil lines in pipes. If
ambient temperature exceeds 38 degrees C (100
degrees F) then the manufacture must supply
efficient cooling and proper hydraulic oil for oil
viscosity to remain within its operating range, even
SECTION 02840
Page 11
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