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REED
00 MODEL:
C50SS
TRAILER CONCRETE PUMP
OPER.
PAGE 23
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When it is necessary to pump unfavorable mixes such as extremely stiff, under
sanded, lightweight concrete, the best procedure is to keep the remixer/agitator
shaft visible all the time. In so doing, the hopper will only be filled to the lower edge
of the remixer shaft making the concrete easier to pump.
•
This method is called the AIR-PLUG method which allows air to be sucked into the
material cylinders along with the unfavorable concrete mix.
•
When it is necessary to pump concrete that is very liquid and has a high
percentage of rough aggregate that tends to separate, keep the concrete level in
the hopper as low as possible in case you encounter a work stoppage.
•
Concrete that has separated or has begun to set and become lumpy should never
be pumped.
•
It is common that at sometime during the concrete placement you will be required
to stop pumping for a period of time. This could be due to job site problems or
possibly lack of concrete. Regardless of the reason, it is
IMPORTANT to MOVE
the concrete in the line during these periods. This can be accomplished by
operating the pump in
REVERSE for 2-3 strokes and then after another 10-15
minutes operate the pump FORWARD for 2-3 strokes.
•
Downtime between forward and reverse movements will depend on the consistency
and type of mix. Also if shutdown is for too long a period it may be necessary to
clean out the delivery system and pump. Determine this from your experience in
the material being pumped.
•
Avoid having the material in the hopper separate during shut down.
•
Air pockets in the delivery line can be dangerous as the air compresses within the
delivery line and when it is released abruptly at the end of the line, the material
being pumped is discharged in an explosive manner. Avoid air pockets. Keep
sufficient material in hopper to prevent the induction of air into the material
cylinders.
•
Never bend or kink the flexible hose during the pumping operation. A kink is an
obstruction that can stop the material flow, allowing pressure to build up in the
system creating a dangerous condition.
When this occurs, the pumping direction must be
REVERSED for 3-4 strokes to relieve the
pressure in the line. Stop the pump and straighten out the kink, then resume pumping.
REVISION: