Multiquip LS-60TD - Manual (Page 32)

PAGE 32 — MAYCO LS-60TD PUMP — OPERATION AND PARTS MANUAL — REV. #4 (09/15/11)
DOWN-HILL PUMPING
Down-hill 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.
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 down-hill 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 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 90º elbow
is recommended. The suggested place to tie off is on the
hose, under the clamp.
LS-60TD PUMP — OPERATING PROCEDURES
It is strongly recommended that steel pipe be
used on all vertical pumping for safety and
convenience.
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.
The use of 2 -1/2” I.D. hose in these extreme cases reduces
line pressures or the addition of slight amounts of water to the
mix, if permissible, will permit easier pumping. The use of
certain pumping admixtures may help.
If excessive pulsation exists in the hose, it is advisable to
use burlap or some means of wear protection under the hose
at points where the hose may wear through the outer cover;
e.g. over forms, steel or sharp curbs.
SNAP-JOINT COUPLINGS
When using Snap-Joint couplings with gaskets to join hose,
see that they are washed clean after each job. Keeping the
hose ends clean (heavy duty) is very important for the best
job setup. A thin coat of grease on the rubber gasket or
dipping both coupling and gasket in water before coupling the
hose will make for easier installation.
NEW PUMPS
All new pumps are ‘water pressure tested” at the factory This
procedure permits a thorough inspection of entire drive
system and valving under simulated full load conditions. The
pump owner can do the same by making an adapter to couple
to the end of the discharge cone: e.g., the use of a standard
2" pipe cap with a 3/8" drilled hole in the center, screwed on
to the end of hinged cone or reducer at the pump.
Fill the hopper with water after making sure that all sand and
rock have been removed from manifold. Operate pump at full
throttle and the 3/8" diameter hole restriction will create
sufficient back pressure to make thorough inspection of all
moving parts.