Exchange Condition Assessment

Project Stage

Stage	Name	Valid
0	Portfolio requirements
1	Conception of need
2	Outline feasibility
3	Substantive feasibility
4	Outline conceptual design
5	Full conceptual design
6	Coordinated design and procurement
7	Production information
8	Construction
9	Operation and maintenance
10	Disposal

Overview

The scope of this exchange requirement is to enable the exchange of information about the condition of an element or a group of elements (typically acting as an asset).
Condition may be established to determine if an element requires maintenance in order to bring it to a required level of operating efficiency. Ultimately, the condition of an element may become so poor as to require replacement.
The condition of an element may be established by:

• instrumentation in place that enables operating parameters to be continuously monitored; the parameters being selected such that they indicate the current condition of the asset (e.g. vibration).
• periodic inspection that may be either visual, carried out with the assistance of instruments or a combination.

The condition of an element is considered to be determined by one or several condition criteria. Each criterion is a particular measured or assessed value that contributes to the overall condition of the element.

• A criterion that is measured using calibrated instruments and whose value is repeatable by different instruments is considered to be objective. An objective criterion will typically be a measured value.
• A criterion that is assessed by observation and whose value may not be repeatable between assessors is considered to be subjective. A subjective criterion will typically be measured against an arbitrary scale (e.g. 1 represents new condition whilst 10 represents poor condition requiring urgent replacement).

The actual condition of an element is considered to be determined by bringing together the various criteria within a group.
Particular target values may be established for maintenance or replacement operations to be carried out on an element. Such values are defined as constraints. When the condition of an element reaches or exceeds a value indicated by a constraint, it signifies that a particular action should be triggered. A condition based 'event' may be based on either objective or subjective criteria. For objective criteria, the potential exists for live reporting of condition data from fixed instrumentation.

Condition information about an element, group or asset needs to include:

• The element, group or asset whose condition is being assessed
• The condition criteria determining the overall condition including, for each criterion:
  • Identity and owner history
  • Name and description
  • Date and time at which the criterion is measured or assessed
  • The value of the measured or assessed criterion
• For the grouping of criteria as a condition assigned to the element, group or asset
  • Identity and owner history
  • Name and description of then group

Information Requirements