GENERAL RULE
S
700+smgr.fm
PAGE 45
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AF
ETY M
AN
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IV. Cleaning The Pump And System
9. Safety Rules For Cleaning The Boom
9.1
Do not let down your guard when the pour is completed. Acci-
dents also happen during clean-out and the drive back to the yard. It is important
not to become relaxed about job safety until you are no longer on the job.
9.2
Watch for power lines and any other obstruction when moving
the boom for clean-out or folding the boom for transport!
9.3
Using compressed air to clean the boom delivery system should
only be done when no other method is practical or as recommended by the manu-
facturer.
9.4
If you have to use compressed air for cleaning the boom, you
must
have all of the necessary accessories. Read and understand the complete
safety rules regarding cleaning out with compressed air (point 12.5 on page 48 of
this
Safety Manual
). Cleaning with compressed air should only be done by a qual-
ified person.
9.5
Never
use compressed air to blow through rubber hoses or sec-
tions of pipe less than 40 feet (12 meters). In the case of rubber hoses, their flexi-
bility will allow them to “whip” wildly with the force of the air and moving
concrete. Short sections of pipe will not have sufficient mass to allow the concrete
to move slowly, so there will be rapid expulsion of the material.
9.6
If the ball or go-devil doesn’t come out of the delivery system
after applying compressed air,
you must relieve the pipe of air pressure before
opening it.
If the bleed-off valve plugs when you are draining the air, the only safe
way to proceed is to drill small holes into the pipeline, which will then allow the air
to escape. Wear a full face shield when drilling the holes. Any pipe you have drilled
into is ruined and must be replaced. Drill the holes to relieve the air pressure even if
the concrete has set in the pipe. The pipe is hazardous until the pressure is relieved.
9.7
Exercise care when “tapping” on the pipeline to find the loca-
tion of the clean-out ball. Applying too much force will dent a single-wall pipe
(making it weak and unsafe) and could break the carbide insert of double-wall
pipe.
9.8
It is better to let the pipe be ruined by setting concrete than to risk
injury by ignoring safe procedures. Remember, pipeline is replaceable, you are not.
10. Safety Rules For Cleaning The Concrete Valve And Hopper
10.1
Tipping hazard! Before moving the unit for cleaning,
secure
the boom and outriggers into the travel position.
10.2
Wear protective clothing and equipment when cleaning the
concrete pump because the lime in concrete can burn your skin. Protect against
concrete burns and concrete poisoning by wearing rubber boots and gloves during
clean-out or any other time that you will be in contact with the concrete.
WARNING
DANGER
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
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