Schwing SP 305, Руководство по эксплуатации

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Appendix
Operation Manual - SP 305 74 revDate
Using a Nomograph
General information
If you have read the original Schwing America
publication
Nomographs—A Guide to Usage , you will
notice several changes in this document. Because not
all of the power from the truck engine can be used for
the concrete pump, the TK number of the engine has no
meaning. Therefore, this section about using
nomographs is being adapted especially for boom
pumps. We can still figure out the TK of the job to do,
but the suitability of the pump has to be determined in
a different manner. To make the pump numbers and job
numbers match, we will use a “Power Factor Number,”
which takes into account the power of the hydraulic
pumps instead of the engine and is easy to use with
cubic yards per hour and PSI instead of cubic meters
per hour and bar.
Concrete pumps are limited in what jobs they can do
by three factors:
1. the amount of power available,
2. the maximum concrete output available, and
3. the maximum concrete pressure available.
To estimate the power a pump requires to complete a
particular job and to determine which pump is
appropriate, a
nomograph is used.
With a concrete pump that is driven by its own prime
mover, such as a trailer-mounted concrete pump or a
truck-mounted pump with a separate drive engine, the
power rating (in Kw) is shown for the engine or electric
motor. With a truck-mounted pump that uses a PTO
from the truck engine, the power rating reflects the
power output of the hydraulic pumps only. (All the
power from the truck engine is normally not available
to the concrete pump and should not be used for power
calculations.) If you know the required output for the
job, the nomograph will help you calculate the required
pressure. If you know the output and pressure, you can
calculate the power requirement.
The nomograph was developed by extensive trial-and-
error testing and has proven to be accurate to ±10% in
nearly all pumping applications. The original
nomographs used “spread measure” of fresh concrete
instead of slump, and the two are not directly
interchangeable. Some approximations are used in
translating the charts from spread measure to slump,
but the ±10% accuracy still applies. In all cases, it is
assumed that you will receive fresh, high-quality
concrete on your job and that the concrete will be
plastic enough to flow into the material cylinders. If
you know that the concrete will be hard to feed into the
cylinders, you should adjust the output requirement to
compensate for incomplete filling. For example, if you
will need 50 cubic yards per hour into the form but the
concrete is so stiff that it will fill the cylinders only
80%, you should multiply the required output by 1.25
(1
÷
80%).
The nomograph is divided into four quadrants (Figure
49).
100
2000
200
300
400
500
600
800 1000 1200 1500 1800 2500 3000
2"
2.5"
3"
4" 5" 6"
P in PSI
Q in yd
3
/hr
.
Pipeline diameter in inches
Proportional value of pipeline in feet
For vertical placing,
add 1.105 PSI per foot
of level difference.
Slump of fresh concrete in inches
6" 5" 4.5"
4"
870 1566
600 3000 2800 2600 2400 2200 2000 1800 1600 1400 1200 1000 800 400 200
200
180
160
140
120
100
80
60
40
20
67
116 Rodside
Pistonside
120/80 x 1600:200
132 KW
Pumpkit Model:
Power:
132 KW
(72600)
TK number does not apply to truck mounted units.
Curve shown is the Power Factor number (PF).
000029.eps
Upper left quadrant
Upper right quadrant
Lower right quadrant Lower left quadrant
Figure 49
Quadrants
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