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PAGE 32 — MAYCO LS600 PUMP — OPERATION AND PARTS MANUAL — REV. #4 (9/15/11)
It is strongly recommended that
steel pipe
be
used on all vertical pumping for safety and
convenience.
When pumping is resumed, you can expect 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 downhill will de-
crease 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.
VERTICAL PUMPING
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
steel 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.
When pumping vertically, using
all hose
, it is recom-
mended 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 90º elbow is recommended. The suggested place
to tie off is on the hose, under the clamp.
LS600 PUMP — PUMPING INFORMATION
All admixtures will be shown on the redi-
mix concrete ticket. Before starting the
pumping job, ask the driver of the redi-mix
truck to see the concrete ticket and note the
admixtures that exist and take the proper
action.
REMIXTURES
Remixtures that are designed into the concrete mix by the
redi-mix company or an architectural engineering company.
This section lists common admixtures and a brief explana-
tion of their functions:
A. Pozzolith 300 – or the equivalent acts as a water
retarder and a lubricant. On a lean mix, long pushes,
stiff mixes, and vertical pushes, Pozzolith 300R helps
pumpability.
B. MBVR – air entraining, acts as a lubricant.
C. Calcium Chloride – commonly referred to as C.C.,
is used as an accelerator. When pumping a load with
calcium chloride, it is recommended that you wash out
if the waiting time between delivery trucks becomes
too long.
D. Super Plasticizers – acts as an accelerator. The
concrete will look very wet after the super plasticizer
is added, but will begin to set up very fast. Wash out
immediately if you do not have a truck waiting. Super
plasticizers are used mainly on commercial jobs.
E. Red Label – acts as a water retarder and an accelera-
tor. Red label will be used mainly on commercial jobs.
F. Fly Ash – is used to help increase the strength of the
concrete and decrease the cement content per yard.
This is one of the most common admixtures used.
DOWNHILL PUMPING
Downhill pumping can be a difficult procedure on some jobs.
The slurry procedure would be the same as explained
Priming The Pump With Slurry Mixture
section of this manual.
It is suggested that a sponge approximately 2”x 4”x 6” in
size be placed in the hose before the start of pumping.
Wet the sponge before placing it in the hose to keep the
slurry from running too far ahead of the concrete, which will
reduce the possibility of separation. When the pump is
stopped, the material can flow slowly down, due to gravity,
and cause the hose to collapse.
HOSE PULSATION
A slight pulsation of the hose will always be noticeable near
the pump. Excessive pulsation of the hose near the pump
is normally due to higher than average line pressures
caused by stiff, harsh mixes, or extremely long pumping
distances.