Schwing SPB 28, Руководство по эксплуатации

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GENERAL RULE S
PAGE 38
700+ smgr.fm
S AF ETY M AN U AL
8.18
Do not let the concrete level in the hopper become low! If air
is sucked into the material cylinders, the pump will compress the air. Compressed
air always poses a hazard as it is expelled from the hopper or the delivery pipeline
(Figure 51). If air is taken into the material cylinders, take the following steps to
minimize the hazard:
1. Stop the pump immediately. Hit the emergency stop switch 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. If possible, fill the hopper with concrete to just below the grate, then
pump slowly in reverse for several 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 (see Figure 51).
Personnel should move a prudent and reasonable distance beyond the end-
hose movement area or the point of discharge, and personal protective
equipment (P.P.E.) should be worn.
4. When the pump is restarted, pump forward slowly 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 concrete runs steadily from
the end and there is no movement of the delivery system.
If workers are positioned in high or precarious places, warn them to expect a loud
sound as the air escapes the pipeline. (Warn them even if they are well away from
the discharge.) That way, we can prevent the worker from falling as a result of
being startled by the noise.
WARNING
hosepop 8 .eps
Figure 51
Remove everyone from the discharge area
whenever air is in the line