Alarm List and Rationalisation Record

Alarm Tag,Message Text,Source Tag,Trigger Condition,Priority,Consequence of Inaction,Time to Respond,Operator Action,Class,Deadband,On Delay s,Off Delay s,Auto Ack,Suppressed When,Rationalised By,Date
AL-001,Emergency stop activated,ESTOP-01,Signal de-energised,High,Plant remains stopped,Immediate,Identify station and make safe before reset,Safety,,0,0,No,,,
AL-002,Guard door open,GS-101,Signal de-energised,High,Machine cannot run,Immediate,Close and latch guard then reset,Safety,,0,0,No,Maintenance mode,,
AL-003,Feed tank level high high,LT-101,> 95%,High,Overflow and spill,1 minute,Check outfeed route and clear blockage,Process,2%,2,5,No,,,
AL-004,Feed tank level low low,LT-101,< 5%,High,Pump runs dry and is damaged,1 minute,Stop pump and restore feed,Equipment,2%,5,5,No,Pump stopped,,
AL-005,Reactor temperature high,TT-101,> 150 degC,Medium,Off specification product,10 minutes,Reduce feed rate and check cooling,Quality,2 degC,0,5,No,,,
AL-006,Reactor temperature high high,TT-101,> 180 degC,High,Runaway reaction,Immediate,Confirm master trip and investigate,Safety,2 degC,0,0,No,,,
AL-007,Feed flow low,FT-101,< 5 m3/h,Medium,Sequence stalls,5 minutes,Check strainer and valve position,Process,1 m3/h,10,10,No,Pump stopped,,
AL-008,Feed pump fault,MTR-101,Starter aux open with run command,Medium,Loss of feed,5 minutes,Check overload and reset at MCC,Equipment,,3,0,No,,,
AL-009,Valve failed to open,XV-101,No open limit 10 s after command,Medium,Sequence holds,5 minutes,Check air supply and limit switch,Equipment,,10,0,No,,,
AL-010,Remote I/O communication loss,,Watchdog expired,High,Loss of control and indication,Immediate,Check network and panel power,System,,3,0,No,,,
AL-011,Control power failure,,24VDC below threshold,High,Total loss of control,Immediate,Restore supply then restart per procedure,System,,0,0,No,,,

# Alarm Rationalisation Record
## {{PROJECT_NAME}}

| | |
|---|---|
| **Document title** | Alarm Rationalisation Record (ALM) |
| **Document number** | {{DOC_NO}} |
| **Revision** | {{REV}} |
| **Date** | {{DATE}} |
| **Project** | {{PROJECT_NAME}} |
| **Client** | {{CLIENT}} |
| **Prepared by** | {{AUTHOR}}, {{COMPANY}} |

### Revision history

| Rev | Date | Description | Author | Approved |
|---|---|---|---|---|
| 0 | {{DATE}} | First issue | {{AUTHOR}} | |
| | | | | |

### Approval

| Role | Name | Signature | Date |
|---|---|---|---|
| Author | {{AUTHOR}} | | |
| Reviewer (engineering) | | | |
| Approver ({{COMPANY}}) | | | |
| Approver ({{CLIENT}}) | | | |

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## Why this document exists

An alarm exists to tell an operator to do something they would not otherwise do, in time for it
to matter. ISA-18.2 makes that testable with three questions, and every alarm on the list must
answer all three:

1. What is the **consequence** if the operator does nothing?
2. How long do they have to **respond** before that consequence occurs?
3. What **action** do they take?

If a proposed alarm has no answer to question 3, it is an indication and belongs on a status
display. If it has no answer to question 1, delete it.

## Priority assignment

Priority follows from consequence severity and from the time available, not from how important
the equipment feels.

| Priority | Consequence | Time to respond | Target share of alarms |
|---|---|---|---|
| High | Injury, environmental release, major loss | Under 3 minutes | 5% |
| Medium | Product loss, equipment damage | 3 to 30 minutes | 15% |
| Low | Efficiency, minor quality | Over 30 minutes | 80% |

## Performance targets

From ISA-18.2, per operator console:

| Metric | Target | Maximum acceptable |
|---|---|---|
| Average alarms per hour | 6 | 12 |
| Peak alarms in 10 minutes | 5 | 10 |
| Time in flood condition | 0% | 1% |
| Standing alarms | 0 | 5 |

Measure these during the SAT and again after 30 days of operation. An alarm system that meets
them on day one and not on day thirty has a chattering alarm somewhere, and the deadband or the
delay is wrong.

## Rationalisation session record

| Date | Attendees | Alarms reviewed | Added | Removed | Re-prioritised |
|---|---|---|---|---|---|
| | | | | | |

## Chattering and stale alarms

| Alarm | Occurrences per hour | Cause | Action | Closed |
|---|---|---|---|---|
| | | | [Deadband, delay, or fix the instrument] | |