ABB 800xA Operation page 147

Section 9 Heat Exchanger Asset Monitor (HXAM)
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Stable will be when the BOPS that is significantly different is recorded, remains
within one percent of change for three consecutive executions.
If Design Heat Transfer Efficiency (Design U) is configured by the user, the
calculated Ubaseline will be compared against the Design U during training. If
Ubaseline is down by a percentage (U_Significant_Decline_Level) that is
configured by the user or more of Ubaseline, an Asset Condition Document (ACD)
will be created informing plant operations personnel that the heat exchanger heat
transfer efficiency has declined significantly, and that a fault report or work order
may be necessary.
Monitoring
After the TP is over, the Asset Monitor periodically (refer to AMSI in
page 141) checks the input data set and compares it against the available BOPS. If
the input data falls within one percent of any particular BOPS data set, Enew and
Unew will be calculated, and compared to the BOPS stored Ebaseline and
Ubaseline respectively.
Reporting Changes
If Enew is down by a percentage (E_Decline_Level) that is configured by the user
or more of Ebaseline, an ACD will be created, informing plant operations personnel
that the heat exchanger operational efficacy has declined, and that a fault report or
work order may be necessary. If Enew is down by a percentage
(E_Significant_Decline_Level) configured by the user or more of Ebaseline, an
ACD will be created, informing plant operations personnel that the heat exchanger
operational efficacy has fallen significantly, and should be investigated further.
Conversely, if Enew has gone up by a percentage (E_Improvement_Level) that is
configured by the user or more, an ACD will be created indicating that the heat
exchanger Performance Factor has improved and similarly, an ACD will be created
indicating that the heat exchanger Performance Factor has improved significantly if
Enew has gone up by a percentage (E_Significant_Improvement_Level) that is
configured by the user or more. At this point, the BOPS used for the comparison
3BUA000150-600
W Cold.
Delta P Hot.
Delta P Cold.
Methodology
Table 10 on
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