Schwing SPB 28, Руководство по эксплуатации

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GENERAL RULE S
700+smgr.fm
PAGE 29
S AF ETY M AN U AL
line material, and other factors. Read and understand the minimum wall thickness
chart in the Appendix of this
Safety Manual . Bursting pipes and concrete escap-
ing under pressure is a serious safety hazard! (See Figure 37.)
7.10
When laying out a pipeline, it is preferable to use an elbow instead of a hose to
make direction changes. Elbows have less resistance to flow than hoses, and will
therefore reduce the overall pressure required to push the concrete.
7.11
Use the largest diameter pipeline that is practical. Use steel pipe instead of rubber
hose when practical. This will keep the pressure required to push the concrete to a
minimum.
7.12
Support the delivery pipeline. Either an “S” transition pipe should be used to
bring the pipe to ground level, or
each section of the pipeline should be supported
at the pump outlet level.
7.13
The sections of pipe nearest the pump are subjected to the high-
est pressure and the greatest wear. Because of this increase of pressure near the
pump, you should install only thick-walled pipe, in “like new” condition there.
Read and understand the minimum wall thickness chart in the Appendix of this
Safety Manual .
7.14
The maximum material pressure of the pump must be the
only factor used to determine what thickness of pipe and what type of ends
are needed
. In the case of a rock jam or any other type of blockage, the maxi-
mum pressure of the pump will be exerted .
7.15
Grooved (Victaulic) ends are not recommended for concrete pumping. Read and
understand the comparison between heavy duty raised, metric, and grooved ends
in the Appendix
of this Safety Manual .
7.16
If the pipeline remains on the job (as is the case when pumping
a high-rise building), the operator is responsible for checking the pipeline for
dents, cracks, wear, and continuity each day before the pour begins.
thinwall
2
.eps
Figure 37
Delivery system components must be able
to withstand maximum pump pressure
WARNING
WARNING
WARNING