136
Appendix
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
The quadrants
1. The upper left quadrant describes the power curve
of a given hydraulic pump Kw rating and the maxi-
mum output and maximum pressure of a particular
model of concrete pump.
Any concrete pump selected for a job must meet three
technical parameters:
• the power factor number of the pump must be
equal to or greater than the power factor number
of the job,
• the maximum output required by the job must be
available from the pump, and
• the maximum pressure required by the job must
be available from the pump.
It is important to notice the pump maximum pressure
and maximum output, even if the power factor number
of the pump is larger than the job requires. These pa-
rameters are decided during the design stage of the unit
and cannot be adjusted on the job. If the unit is able to
go from rod side to piston side, maximum pressure and
output can be exchanged—that is, you can decrease
one while increasing the other the same amount.
The power factor number (PF) replaces the TK number
on a truck-mounted unit. It is the Kw multiplied by a
constant (550) that has several eciency factors
gured in. When using an Americanized nomograph
(pressure in PSI and ow in cubic yards per hour), the
pressure multiplied by the output must always be less
than or equal to the PF. For example, if you needed 50
cubic yards per hour and determined that this will re-
quire 750 PSI, you can multiply 50 by 750, which equals
37,500. Any pump you select must have a PF of 37,500
or greater. If you are using a nomograph that has been
converted to metric units of measure (pressure in bar
and output in cubic meters per hour), you can still multi-
ply the pressure by the output, but you must multiply the
answer by the conversion factor between metric and
English units of measure to get the PF. The conversion
factor for cubic yards to cubic meters and for bar to PSI
is 18.966. For all practical purposes, you can use 19.
For example, if you need 50 cubic meters per hour and
determine that your job setup will require 65 bar, you
can multiply 50 by 65, which equals 3250. Multiply this
by 19, and you nd that your PF requirement is 61,750.
Again, any pump you select for the job in this example
should have a PF of 61,750 or greater.
P in PSI
Q in yd
3
/hr.
TK number does not apply to truck mounted units.
Curve shown is Power Factor number (PF).
72600
132 KW
3000 2800 2600 2400 2200 2000 1800 1600 1400 1200 1000 800 600 400 200
200
180
160
140
120
100
80
60
40
20
For vertical placing,
add 1.105 PSI per foot
of level difference.
Rod Side
Piston Side
boom-upper left quad-eps
Power factor number
Maximum output
Maximum pressure
Kw Rating
Power Curve
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