Appendix
All
S
P Rock Valve Model
s
Startup 250:Users:Danny:Desktop:Operation manuals:line
pumps:All SP Rock Valve models:Frame files:Appendix.fm
Operation Manual -
1
3
9
Any concrete pump selected for a certain job must
meet 3 technical parameters:
1. The TK number of the pump must be equal to or
greater than the TK number of the job,
2. the maximum output required by the job must be
available from the pump, and
3. the maximum pressure required by the job must be
available from the pump.
It is important to notice the pump max. pressure and
max. output even if the TK of the pump is larger than
the job requirement. An example of the reason for this
is illustrated in point #3 below. These parameters are
decided during the design stage of the unit and cannot
be adjusted on the job. If the unit has the ability 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 an equivalent amount.
1. The
Technic
a
l I
d
entific
a
tion N
u
mber
(abbreviated as TK) is the Kw multiplied by
25, and the number 25 is a constant that has
several efficiency factors figured in. When
using a metric nomograph (pressure in bar and
flow in cubic meters per hour), the pressure
multiplied by the flow will always directly
relate to the TK. For example, if you needed 50
cubic meters/hour and determined that this will
require 60 bar you can multiply 50 x 60, which
equals 3000. Any pump you select must have a
TK of 3000 or greater. If you are using a
nomograph that has been converted to
American units of measure (pressure in PSI
and flow in cubic yards/hour) you can still
multiply the pressure times the flow, but you
must divide the answer by the conversion
factor between metric and US units of measure
to get the TK. The conversion factor for yards
3
to meters
3
and bar to PSI is 18.966. For all
practical purposes you can use 19. For
example, if you need 60 cubic yards/hour and
determine that your job set-up will require 950
PSI, you can multiply 60 x 950, which equals
57,000. Divide this by 19 and you find that
your TK requirement is 3000. Again, any
pump you select should have a TK of 3000 or
greater.
2. The
M
a
xim
u
m O
u
t
pu
t
(abbreviated as
max Q) is determined by the size of the
hydraulic pumps, the number of strokes per
minute and the size of the differential and
Figure 67
Upper left quadrant
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