86
Operation
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Pours that require a separate pipeline are usually can-
celed when the weather is very cold. If the pour is not
canceled, be sure that any pipeline laid outside is cov-
ered with insulated blankets and has a hot air supply
owing through it from a torpedo heater or a similar heat
source. If the pipeline is not heated, the concrete will
probably not be able to get through the line because
the slurry will freeze against the walls of the pipe. This
can result in a blockage. To clear the line, take all nor-
mal steps to clear the block, and work fast enough that
the concrete will not freeze again as soon as it starts
moving.
If the concrete freezes in the pipeline, you are nished
pumping until you have warmed up the line. The good
news is that the concrete will not set when it is frozen.
If you bring the pipeline into a warm place, you will be
able to clean it out.
If the concrete freezes in the hopper, you are nished
pumping. Find a warm place to bring the machine and
clean it as it warms.
If the concrete contains calcium chloride, keep the con-
crete alive using the same techniques used for pumping
on hot days. The calcium chloride accelerates setting,
but if it does freeze, the setting stops. When you do
begin to warm the machine, the concrete will begin to
set again, even more quickly than on the job, because
you are now in a warm area. Do not waste time when
cleaning a machine in these conditions.
Be very careful of ice when pumping in cold conditions.
Never stand on ice-coated pipes or other round objects.
To Next Page
Loading...