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PAGE 16 — C-30HD — PARTS & OPERATION MANUAL — REV. #4 (03/06/01)
7.10 Shake out around 2 feet of concrete before reconnecting
hose to pump. After this is done, connect hose to pump and
resume the pumping operation.
8. If it is necessary to wait 1/2 hour or more for another load of
concrete, it is advisable to consider the factors affecting the
concrete that is already in the pump and system. To prevent
setting of the mix in the system: 1) how old is the concrete ? 2)
is there an accelerator, calcium chloride, red label, etc., in the
concrete ? 3) the temperature of the day, 80, 90, degrees? 4)
how much system you have out and how stiff was the mix you
were pumping? If, for any reason, the mix should set up in the
system, the following procedure is suggested:
Note: Use extreme care! The hose is under pressure!
Disconnect the hose from the pump and wash the pump out
immediately. Reconnect the hose and fill the hopper with water.
DO NOT try to push all the concrete out of all of the hose line
at one time. For example: If you had 200 ft. of system out, you
would disconnect each hose. Clean it out by pushing water
through the first hose off the pump, then continue progressing
through all the hoses, until all the system is clean. If waiting
time is excessive, it would be wise to wash out the pump and
hoses and start over when the new truck arrives. This can be
avoided by being attentative to the pump and system, also
taking into consideration the above 4 factors affecting the mix.
9. “Down-hill pumping” can be difficult on some jobs. The slurry
procedure would be the same as explained on the pages titled
Operating Suggestions. It is suggested that a sponge 2”x 4”x
6” be placed in the hose before the start of pumping. Wet the
sponge before placing it in the hose. The reason for using the
wet sponge is to keep the slurry from running too far ahead of
the concrete and so reducing the possibility of separation.
When the pump is stopped, the material can flow slowly down,
due to gravity, and cause the hose to collapse. When pumping
is resumed, you can expect a blockage at the point of hose
collapse. To prevent this from happening, the hose can be
“kinked off” at the discharge end when the pump is stopped
to prevent the gravity flow of the material in the hose. The use
of stiffer mixes when pumping down-hill will decrease gravity
flow of the material in the hose and will assure a smoother
operation between the cam roller bearing and cam plate. As
with any job, make sure that the hose and the couplings are in
good workable shape.
10. When pumping vertically:
A. When pumping vertically up the side of a building, above
40 feet, we would recommend the installation of steel pipe
securely fastened at intervals as necessary to support the
pipe. Ninety degree, long radius pipe sweeps should be
installed at the top and bottom of the steel line. Use a 25 ft.
hose, or short section, off the pump; and for the balance of
the horizontal distance to the vertical line, use steal pipe. This
type of installation has been satisfactory on many jobs being
pumped in excess of 100 feet high. Line pressures are always
less using steel pipe as compared to hose.
B. When pumping vertically, using all hose, it is recommended
not to go higher than 50 feet with hose. The hose should be
tied off at intervals of 10 feet, if possible. Special attention
should be given when tieing the hose off at the top as the
hose will have a tendency to stretch when filled with concrete.
This will increase the possibility of a blockage at the point where
the hose is tied off. To avoid this, a long radius of 90 degree
elbow is recommended. The suggested place to tie off is on
the hose, under the clamp.
Note: It is strongly recommended
that pipe be used on all vertical pumping for safety and
convenience.
If it is absolutely necessary to use hose, then use this section
as a guide.
11. If the volume at the end of hose starts to decrease gradually
and eventually almost stops, it is quite likely that the valve
seats have had excessive wear and need replacement. Once
they have reached a certain wear point, they may “channel
out” rapidly and material will reciprocate past the ball on each
stroke. The hollow steel ball should be replaced when it starts
to show dents or appears to be badly worn. Sand and
aggregate materials in some areas are extremely sharp and
hard and therefore highly abrasive. Under these conditions
when pumping stiff mixes, or to high elevations which cause
line pressures, it will be noted that valve components may
have short wear life. If this condition exists, it is advisable to
remove the manifold only, and inspect the lower seat at the
end of each day. If it appears that the seat is beginning to
“channel out, replace before starting the next day’s pour. The
upper valve seat can be inspected after each washout by
running your finger around lower edge of seat where the ball
makes contact. You can reach this from the inside of the hopper.
Be sure that the engine is turned off.
C-30HD OPERATING INFORMATION