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Clearing the Blockage

By alternately reversing the pump and resuming pumping for a few cycles, the pump operator may be able to break loose a minor rock jam. This should not be tried more than a couple of times, however, as it can jam the pipeline even tighter. If the reversal method doesn't work, the operator must locate the blockage, then break back the line and clear it out.

Always make sure the line is no longer under pressure prior to clearing a blockage. Stand to one side of the line and remove the coupling nearest the jam. Let all the free-flowing concrete run out of the open end of the line by lifting the line, then bend the hose or tap on the pipeline in the area of the jam and shake out loose particles.

Important safety tip: when trying to clear a line blockage, NEVER use compressed air. If a greatly increased pump pressure wont move the blockage, compressed air wont be able to either. While using compressed air utilizing proper safety precautions is OK for cleaning out unblocked sections of pipe, using it on blockages can cause all kinds of problems, including the need to relieve the built-up air pressure, residual air pockets, and additional blockages due to segregation.

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