Schwing SP 305, Operation Manual

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Appendix
SP 305
Startup 250:Users:Danny:Desktop:Operation manuals:line pumps:maverick
(P305):Appendix.fm
Operation Manual -
81
Bearing in mind that the nomograph should only be
considered accurate to within ±10 percent, you should
always calculate conservatively, and allow for the
graph tolerance. In the case of the pump in Figure 57,
we should still be safe even if the pressure required
were 10% greater (690 PSI).What if you already own
the pump shown in Figure 56? Is there anything that
can be done to the job specifications to make the unit
with the less powerful pumps work? You could use the
smaller PF unit shown in Figure 56 if you can get
permission to do any of the following things:
• Pump the top of the building at 85 yd
3
/hr
instead of 100 yd
3
/hr.
• Pump the top of the building at a 6-inch slump
instead of 5-inch. (This would still be within
specifications.)
• Remove some of the rubber hose at the end of
the horizontal run. Normally, with job circum-
stances that did not require a substantial verti-
cal run, you could also use 6-inch instead of 5-
inch-diameter pipeline. But in our example, the
entire vertical run was made with the boom.
The boom can never support 6-inch pipeline.
P (in PSI)
Q (in yd
3
/hr)
Power Factor number (PF)
W
orking power (in kW)
For vertical placing,
add 1.105 PSI per foot
of level difference.
72,600
132 kW
English to Metric Conversion factor is PF 18.966
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
Example Job
000018.eps
Figure 57
Same model pump with larger Kw hydraulic pumps
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