Together all of these tools provide engineers and operators with a good set of complementary
functions for reducing excessive alarms in the case of both standing alarms and alarm floods.
You can use some or all of these tools based on site needs.
For more detailed information about the functionality described above, see the Station
Configuration Guide.
Factors that contribute to excessive alarms
The main causes of excessive alarms (and alarms that have no immediate operational
relevance) include:
n
Alarm design, for example, when the alarm system is not properly rationalized to
reduce alarm floods and excessive standing alarms.
n
Maintenance issues, for example, when the control system is being modified or when
sensors are taken out of service for repair and the alarms related to those sensors are
taken out of service at the same time. If no preemptive action is taken in relation to
those alarms, standing (and possibly spurious) alarms can appear during repair and
testing.
n
Changes in equipment mode, for example, when there is a change in the product being
manufactured and different operating parameters are required.
n
Compound events, for example, when there is a superseding event, like a compressor
trip, or when there are multiple related alarms.
n
Other causes. This category covers a range of other causes that need to be addressed in
a different manner to the causes listed above.
The likely impact of these factors is summarized in the following table.
Cause Most likely consequence
Standing alarms Alarm floods
Alarm design X X
Maintenance X
Equipment mode X
Compound event X
Other causes X X
Dealing with excessive alarms
Recommended strategies for dealing with excessive alarms are described below.
Alarms and events
Honeywell 2017 85
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