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9.5 Blockage in the conveyor machine
Problems with delivery can occur in the form of "blockages". A blockage is a
stuck material plug in the vessel outlet or in the hose line. Therefore, with a
blockage, no more material is conveyed and the vessel pressure increases.
In the event of a malfunction caused by a blockage, the blockage must be
removed.
It is important to find and remove the cause of the blockage so that further
plugs are avoided.
9.5.1 Cause for blockage
Blockages are caused mainly by:
− Non-pumpable material mixtures, i.e. too lean or too thick,
− Mixtures that have been standing for too long, water and viscous
material have settled,
− Damaged or kinked delivery hoses.
Other possibilities for blockages are:
− The nominal diameter of the delivery hoses does not meet the
requirements.
− The material and the nominal width of the delivery hoses are not
matched.
− The nominal width of the delivery hoses is different.
− The hose couplings are damaged or do not match.
− Foreign bodies in the delivery machine are too large.
− Material grain size too large (greater than 16 mm).
− The material is already setting (aggregates or dwell time in the
machine).
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