ABB 800xA Operation page 149

Section 9 Heat Exchanger Asset Monitor (HXAM)
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The Shell Side Flow Condition Monitor checks if the flow at Shell Side, which
could be either the Mass Flow if available, else the Volume Flow, has fallen below
the configured limit. If Hot Fluid flows through the Shell Side and Mass Flow for
Shell Side is available, the Shell Side Flow Condition Monitor and Hot Side Mass
Flow Condition Monitor are the same. In this case either one Condition Monitor
is to be enabled. It also holds if Cold fluid flows through the Shell and Cold Side
Mass Flow is available. The only case where enabling both the Shell Side Flow
Condition Monitor and Mass Flow Condition Monitor makes sense is when Mass
Flow for that side is unavailable and Volume Flow for that side is available.
3BUA000150-600
If any of the following variables has exceeded a high or low limit specified at
configuration time:
– Delta T Hot.
– Delta T Cold.
– W Hot.
– W Cold.
– Delta P Hot.
– Delta P Cold.
– HD Hot.
– HD Cold.
– Delta HD.
– Limit Approach Temperature: Warns if it falls below a low limit
specified at configuration time.
– Thermal Crossover Detection: Indicates if the Heat Exchanger is
operating in Thermal Crossover.
– Shell Side Flow: Warns if it falls below a low limit specified at
configuration time.
– Tube Velocity: Warns if it has exceeded a high or low limit specified at
configuration time.
Methodology
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