Scoring & Colour Codes
How scores are calculated
Section titled “How scores are calculated”Each impairment present on a barrier element is assigned a score based on two factors: the type of impairment and the criticality of the affected equipment. These scores are aggregated across connected elements according to the ruleset configured for the installation.
The criticality of a piece of equipment reflects how essential it is to the barrier function. Equipment with no redundancy — where a single failure would leave the barrier fully exposed — is assigned a high criticality. Equipment that forms part of a redundant group is assigned a lower criticality, as the failure of one does not necessarily degrade the barrier entirely.
Different types of impairment carry different weights. An overdue planned maintenance activity, for example, carries a lower score than a confirmed equipment fault, as the former represents a procedural gap while the latter confirms the equipment is not functioning.
- Criticality is assigned by the customer on a scale of 1–6, reflecting how essential the equipment is to the barrier function.
- Severity reflects the nature of the impairment — a confirmed fault carries a higher severity than overdue planned maintenance.
- Score = criticality × severity weighting.
These scores are aggregated across connected elements according to the installation’s ruleset.
What the colour scale represents
Section titled “What the colour scale represents”Status colours provide an immediate indication of barrier health:
- 🟢 Green — the barrier is performing within acceptable parameters.
- 🟡 Yellow / Amber — a warning condition exists. The barrier may be partially degraded or have outstanding actions that require attention.
- 🔴 Red — a critical condition exists. The barrier is considered fully degraded and may not be capable of providing the protection required.
- 🔵 Blue / Grey — no information is available for this element.
Why you can have multiple colours at the same score.
Section titled “Why you can have multiple colours at the same score.”Because multiple impairments of different severities can be present simultaneously, a barrier may carry impairments of more than one colour at the same time. For example, a barrier could have two green-level impairments and one amber-level impairment active concurrently. The overall status displayed reflects the most severe active impairment, but the full breakdown is visible when drilling into the detail.
Where colour coding appears across the system
Section titled “Where colour coding appears across the system”Colour coding is used consistently throughout the BSP — on the area overview diagram, in tables, on performance standard pages, on system pages, and within the major accident hazard view — allowing users to assess status at a glance regardless of which page they are viewing.