70
Operation
SPB Operation Manual
Pumping the Job
If you are not able to see the point of discharge from
where you must operate the unit, be sure your spotter
is in position before starting the pump.
Once you get the start signal, alert the pump operator
to begin pumping.
Clear discharge area
Hose whip hazard. Keep all person-
nel away from discharge hose until
all air is released and concrete is
flowing well.
Personnel should move a reasonable and prudent dis-
tance from the area around the discharge hose until the
slurry is out and the concrete is flowing freely. When
concrete is first introduced into the boom, the possibil
-
ity of compressed air causing a violent hose whip be-
comes probable.
When the slurry is discharged and you begin to see
concrete from the discharge hose, either tell the opera-
tor to stop the pump so you can move the boom to the
area being poured, or, if that is not necessary, continue
to pump and follow instructions from the hose person.
Expulsion hazard. Keep hopper full
to prevent air from entering material
cylinders.
Figure 38
Concrete exploding from hopper
Remind the pump operator to not let the concrete level
in the hopper become low! If air is sucked into the ma-
terial cylinders, the pump will compress the air. Com-
pressed air always poses a hazard as it is expelled from
the hopper or the delivery pipeline (Figure 38). If air is
taken into the material cylinders, tell him he should take
the following steps to minimize the hazard:
1. Stop the pump immediately. Hit the emergency
stop button if that is the quickest way to stop the
pump. There will be an expulsion of compressed
air the next time the concrete valve shifts, which
can be safely absorbed by filling the hopper with
concrete.
2. Pump in reverse for a couple of strokes. This will
not remove all the air, but it should minimize the
amount left in the pipeline.
3. Persons standing at the discharge end or near the
delivery line must be warned to move away until all
of the air has been purged. Warn them to stay back
a reasonable and prudent distance.
4. When the pump is restarted, the slowest possible
speed should be used until all air is removed from
the pipeline. Don’t assume that the first little air
bubble is the end of the compressed air.
5. Do not allow anyone near the discharge until con-
crete runs steadily from the end and there is no
movement of the delivery system.
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Страница 22: ...22 Specifications SPB Operation Manual SPB 35 Working Range Diagram SPB 35 235...
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Страница 122: ...30 Overview S 39 41 SX Operation Manual...
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