Multiquip Mayco Structural Concrete Pump ST-45HRM CE - Manual (Page 28)

PAGE 28 — MAYCO ST-45HRM CE PUMP — OPERATION & PARTS MANUAL — REV. #0 (02/23/04)
ST-45HRM CE CONCRETE PUMP— OPERATING PROCEDURES
It is strongly recommended that
steel pipe be used on all vertical
pumping for safety and conve-
nience.
20. 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 63.5 mm (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.
21. Snap-Joint – When using Snap-Joint couplings with gas-
kets to join hose, see that they are washed clean after each
job. Keeping the hose ends clean (heavy duty) is very impor-
tant 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.
22. 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
51 mm (2-inch) pipe cap with a 9.5 mm (3/8") drilled hole in the
center, screwed on to the end of hinged cone or reducer at the
pump.
Fill hopper with water after making sure that all sand and rock
have been removed from manifold. Operate pump at full
throttle and the 9.5 mm (3/8") diameter hole restriction will
create sufficient back pressure to make thorough inspection
of all moving parts.
NOTE
19. Vertical Pumping – When pumping vertically up the side of
a building, above 12.2 meters (40 feet), we would recom-
mend 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 7.62 meter (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 satis-
factory on many jobs being pumped in excess of 30 meters
(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 7.62 meters (50 feet) with hose. The hose
should be tied off at intervals of 3 meters (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.