What is Alarm Management in Industrial Settings and Why Does it Matter?
- Bruce Nicolson
- 1 day ago
- 6 min read
By Bruce Nicolson, Principal Control Systems Engineer, Intelligent Plant. Bruce has 40 years of experience in the energy sector working on control systems and associated software.
In any industrial facility - whether an offshore oil platform, a chemical plant, a manufacturing line, or a renewable energy installation - control systems continuously monitor process variables. Sometimes hundreds of variables, many times thousands, even millions of variables depending on the size of the facility. When something falls outside of normal parameters, the system generates an alarm to alert the operator.
In theory, this sounds straightforward. In practice, it is one of the most persistent and consequential challenges in industrial operations.
A brief history of industrial alarm systems
To understand why alarm management matters, it helps to understand how industrial alarm systems evolved, both good and bad.
In early control rooms, alarms were entirely physical. Each sensor was connected to the control panel via its own dedicated wire, and each alarm was represented by a physical indicator - a light, a buzzer, or an annunciator tile. Adding a new alarm meant finding physical space on the panel and running new cabling. Space was finite, which meant the number of alarms was finite too. Operators worked with a manageable number of indicators, each carefully considered because adding one came at a real cost.
The arrival of digital control systems and Human Machine Interfaces changed this fundamentally. Suddenly, adding a new alarm required no physical wiring and no panel space - it was a configuration change in software. What had previously required engineering effort and physical constraint now required almost none. The result, over time, was alarm proliferation.
The assumption behind this proliferation was well-intentioned. By having more alarms, it was thought that this meant better visibility of the facility - if something could go wrong, there should be an alarm for it. And if a little colour coding on screen helped operators
distinguish between alarm types, then more colours and more visual complexity must be better still.
In practice, the opposite proved true. Control room screens became increasingly cluttered - filled with colours, shading, and visual complexity that made it harder, not easier, to assess the state of the plant at a glance. And as alarm counts grew, operators found themselves dealing with a constant stream of notifications, many of which required no action at all. The signal was being buried in noise.
The problem was compounded by alarm prioritisation - or rather, the lack of it. When every alarm is configured as high priority, then none of them are. An operator faced with dozens of high priority alarms simultaneously has no way to determine which genuinely requires immediate attention and which can wait. The prioritisation system, designed to help, becomes meaningless.
The consequences of poorly managed alarm systems became impossible to ignore following a number of high-profile industrial incidents in which alarm overload was identified as a contributing factor. The 1994 Milford Haven Refinery explosion, one of the most significant industrial incidents in UK history, found that operators had been dealing with alarms arriving every 2-3 seconds in the five hours leading up to the incident. Incidents like this prompted the industry to take alarm management seriously as a discipline in its own right. Standards such as EEMUA 191 and ISA 18.02 were developed to provide guidance on what good alarm system performance looks like.
Today, awareness of alarm flood and its consequences is considerably better than it was - but many facilities still carry the legacy of years of unchecked alarm proliferation, and active alarm management programmes remain the exception rather than the rule.
What is alarm management?
Alarm management is the process of designing, maintaining, and continuously improving an industrial alarm system so that operators receive only meaningful, actionable alerts. A well-managed alarm system tells an operator what they need to know, when they need to know it, and with enough clarity to act decisively. A poorly managed one does the opposite.
EEMUA 191 sets a maximum acceptable alarm rate of one alarm per ten minutes per operator. Exceeding this threshold leads to alarm fatigue, where the sheer volume of notifications makes it increasingly difficult for operators to distinguish critical alerts from background noise.
Effective alarm management is not a one-off configuration exercise - it is an ongoing discipline. It typically begins with an Alarm Philosophy - a comprehensive guideline document that defines how alarms are handled across a facility. This covers how the alarm system works, who is responsible for what, how alarms are designed, implemented, and maintained, and how changes to the system are managed and documented. Your organisation may have an Alarm Philosophy defined at corporate level that needs to be tailored to the requirements of a specific site. Without one, alarm management tends to be reactive and inconsistent.
What does alarm management involve in practice?
Good alarm management follows a logical sequence of activities:
Benchmarking
Before any improvements can be made, current performance needs to be measured - If you can't measure it, you can't manage it. Benchmarking involves extracting and analysing data from the alarm system to establish a baseline, comparing it against industry standards such as EEMUA 191 to understand where the gaps are.
Auditing
Once a benchmark exists, a formal audit measures processes and systems against both the facility's own Alarm Philosophy and industry best practice. This identifies where the most significant problems lie and provides a structured basis for improvement.
Bad actor resolution
Most facilities have a small number of alarms - or types of alarms - that generate a disproportionately high proportion of total alarm load. These are known as bad actors. Identifying and resolving bad actors typically delivers rapid and significant reductions in overall alarm rate, and is usually the highest priority activity in any alarm improvement programme.
Alarm rationalisation
Rationalisation is a systematic review of every alarm in the control system, with the objective of optimising both quantity and quality. Each alarm is evaluated - is it genuinely needed? Does it require a specific operator response? Is it configured correctly? Alarms that fail this review are removed or reclassified. Alongside rationalisation, alarm prioritisation must be addressed. If all alarms carry the same priority, the prioritisation system provides no value. A well-rationalised system distinguishes clearly between alarms requiring immediate action, those requiring attention within a defined timeframe, and those that are purely informational.
Management of change
One of the most common causes of alarm system degradation is undocumented change. When DCS alarm settings are modified without proper authority or documentation, the carefully rationalised system begins to drift. Effective management of change procedures - and ideally automated systems that check alarm configurations regularly for unauthorised changes - are essential to preserving the improvements that have been made.
Advanced alarm techniques
Once bad actors have been resolved and rationalisation has been completed, more advanced techniques can further optimise alarm system performance. These include shelving, suppression, and state-based alarming - approaches that allow the alarm system to adapt dynamically to different operational states rather than applying the same alarm set regardless of what the plant is doing.
Long-term KPI monitoring
Alarm management is not a project with an end date - it is an ongoing discipline. Processes change, equipment ages, and new projects introduce new alarms. Without continuous monitoring, the improvements achieved through rationalisation will erode over time. Regular KPI reporting, measuring compliance with applicable standards, is essential to maintaining performance in the long term.
What difference does it make?
The operational benefits of effective alarm management extend well beyond compliance. Fewer nuisance alarms mean operators can focus on what matters, respond more quickly to genuine process deviations, and work in a less stressful environment. Equipment experiences less wear from unnecessary trips and start-stop cycles. And production efficiency improves.
In one North Sea deployment, Intelligent Plant's Alarm Analysis software supported a structured alarm management programme that delivered a 10.46% increase in production efficiency across multiple assets - a production gain valued at £59.2 million per year in today's market. The improvement was achieved not just through software but through the combination of the right tools and skilled engineering expertise to act on what the data revealed.
How Intelligent Plant can help
Intelligent Plant has been working with industrial operators on alarm management for over a decade, across oil and gas, manufacturing, and renewable energy facilities in the UK and internationally. Our Alarm Analysis app supports every stage of the alarm management process - from benchmarking current performance and identifying bad actors, to tracking KPIs over time and providing the documented evidence that regulators and safety bodies require.
We also work directly with clients on alarm management services including Alarm Philosophy development, system auditing, rationalisation programmes, and management of change procedures - bringing both the software and the engineering expertise needed to deliver lasting improvements.
If your facility is struggling with alarm overload, or if you are not sure whether your alarm system is performing to the standards expected by the HSE or other regulatory bodies, we would be happy to discuss what good alarm management looks like in practice.
Comments