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Sludge Flow Measuring System
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The Schwing Sludge Flow Measuring System
provides accurate volume and flow-rate measurements
of material leaving the cylinder(s) of a positive
displacement pump. Sensors feed information to
a PLC (Program Logic Controller) which monitors,
determines, and reports on fill efficiency –
percent fill and actual volume, speed of pump-average
rate of flow and accumulated volume pumped over
time.
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System Control and Diagnostics
Integrating the Sludge Flow Measuring System information
with other available data has proven to be an excellent
source of information that directly aids in diagnosing,
controlling and managing the operation of a processing
facility. Additionally, an examination of the performance
readings enables the operator to actually monitor and
track the performance of the mechanical and hydraulic
components.
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How SMFS Works
Schwing Sludge Pumps are designed such that at the end
of each stroke both pressure poppet valves are closed.
During the next stroke one of the poppets opens to allow
flow into the pipeline (discharge). Opening of this
poppet is delayed until the material is compressed and
the pumping cylinder pressure is the same as that of
the pipeline. The end of that stroke is signaled when
both poppets are again closed.
By timing the full stroke and the compression phase
of the stroke, the PLC is able to determine the fill
efficiency of each cylinder, speed of the pump and accumulated
volume pumped over time.
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PLC Calculation
Referring to the table below the Cycle Time is one stroke
is T1. The Compression Phase is the time between two
poppets closing and one of the poppets opening. Pumping
Time T2 is equal to T1 minus the compression time.
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T_ = T_ - Compression Time
Fill Efficiency is Pumping Time divided by Cycle Time.
EFF = T2/T1
Flow Rate is Material Cylinder Volume times Efficiency
divided by Cycle Time.
Flow = Volume x EFF/T1
Percent Fill Efficiency (%) = T2/T1 x 100
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