Schwing SPB 28, Руководство по эксплуатации

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APPEN D IX
PAGE 78
700Apndx.fm
S AF ETY M AN U AL
residential areas, the voltage will be approx. 8000 volts to ground, or 13,800 volts from phase to
phase (distribution voltage). When dealing with power lines mounted on concrete or tall wooden
poles with multiple bells on the insulators, the voltage will be higher—in the 50,000 to 150,000
volt range, but may still be considered distribution to industrial feeds. Power lines mounted on
steel towers high above the ground typically carry voltages above 250,000 volts (transmission
voltage).
Hopper Grate
A meshwork placed over the concrete hopper, typically made from steel bars. It serves the func-
tions of keeping human body parts away from the agitator (when left in its proper position) and
keeping large foreign objects from falling into the hopper, which could cause blockages if they
were pumped.
Jacking the Outriggers
Adjustment of the outriggers in the vertical direction.
Kilovolt (Kv)
A kilovolt is oftentimes abbreviated as Kv. It means 1000 volts. Accordingly, 350,000 volts is
abbreviated as 350 Kv; 100,000 volts is abbreviated as 100 Kv, etc.
Licensed Electrician
A qualified electrician licensed by the state, county or municipality where the connections are to
be made. In some locations, electricians are not required to be licensed, and in these cases the
work should still be carried out by competent professionals. Under no circumstances should
high-voltage connections be made by a concrete pump operator or related personnel.
Maintenance
All procedures for service, inspection, and repair of concrete pumps and related equipment.
Maintenance and inspection are methods of
maintaining the desired state of the equipment.
Repair is the method of restoring the desired state of the equipment.
Maximum Pressure
When talking about a hydraulic system, maximum pressure refers to the highest pressure that can
be achieved with the settings of the circuit relief valves. When discussing concrete output, maxi-
mum pressure refers to the pressure that will be developed if the hydraulic system pressure
reaches the relief valve setting. Concrete pressure is the force at which the differential cylinders
are moving, divided by the cross sectional area of the concrete cylinder. Maximum concrete pres-
sure, then, is developed when the differential cylinders are moving with maximum force, which
is determined by the hydraulic system relief valve setting.
See Also: Concrete Pressure.
Minimum Safety Distance
In this Safety Manual , the term “minimum safety distance” refers to the closest distance that you
are allowed to approach an object, electrical wires, etc. and still leave room for errors in human
judgement or machine malfunction. With electrical wires in the U.S., this distance is 20 feet from
the wires (50 feet above 350 Kv), as recommended by the American Concrete Pumping Associ-
ation. This distance may have other values in different locations. It is up to the operator to know
the value for the place of operation.
Operational Area
The area around a working piece of equipment or point of discharge where hazards can be
encountered due to the nature of the machinery or process in use.