Schwing SP 750-18 - Laying out the Pipeline; Machine Preparation

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Operation
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Laying out the pipeline
Start at the point of discharge and work your way back
to the pump. In most cases, you will need rubber hose
at the point of discharge. Placing crews always prefer
3 or 4-inch rubber hose over 5-inch hose. This means
that you will need a reducer at the discharge end.
If you will have to reduce to smaller-diameter pipe or
hose for the placing crew, always make the long part of
the run with the larger diameter, and reduce as close as
possible to the point of discharge.
Use the fewest hoses possible. Hose has greater re-
sistance to ow than pipe does, so more pressure is
needed to push through hoses than through pipe.
Use the largest-diameter hose the crew will allow you
to use. The diameter of the hose determines the larg-
est-size stone you can pump. If you will be pumping
stone larger than 1 inch in diameter, you will not be able
to use hose that is 3 inches or smaller. To attempt to do
so would result in a blockage.
Do not use hose for changing pipeline direction. Pipe
elbows are available with many degrees of bend, and
pipes require less pumping pressure than hose.
Figure 8
Laying pipeline
Machine Preparation
If you have completed setup before the rst ready-mix
truck arrives on the job, use this time to get some things
ready for the day.
• Find out who will be giving you signals throughout
the day. To avoid conicts in instructions, only one
person should give you signals. Make sure both
of you understand what signals will be used. The
American Concrete Pumping Association (ACPA)
has standardized hand signals for concrete pump-
ing.
• Talk to the placing crew foreman to make sure the
placing crew is aware of the safety rules described
in the Safety Manual. Make sure the crew mem-
bers especially understand the importance of not
kinking the tip hose.
• Review the safety rules with any oilers or laborers
who have been assigned to work with you at the
pump. Show them the Concrete Pump Stop switch
and Emergency Stop buttons.
• If an oiler or laborer will be backing ready-mix
trucks up to your hopper, emphasize the danger
they are in when they place themselves between
the pump and the ready-mix truck.
• Place your water hose where it will be out of the
way but still handy for washing pipes and clamps
and spraying down the hopper.
• When using the Cable Remote, position the re-
mote box and cable where they will be out of the
way.