You are on page 1of 7

Guidelines for use of the Asset Criticality Tool

· Enter Asset name and number from eAM.

Score each of the 7 criteria from “Operational Severity” to “Spares Lead Time”. Use
· the definitions and “weighting” contained in the “Criteria Definition” tab.

· The next column is simply the mathematical sum of the 7 criteria point values.

“Asset Criticality" is the ratio of actual points/total points possible (764), which ranks
· assets on a 100 point scale.

“Asset Criticality” is a number from 100-1 that will correspond with asset criticality in
· eAM (future level is 100-1, current level is 1-4). Determining "Asset Criticality" is the
last step as it "rolls up" all assets evaluated to date. The outcome is a ranking, by
criticality, of all plant wide assets from highest (100) to lowest (1).

This standard criticality tool enables plants to prioritize assets and resources on the
· equipment most critical to plant operation. The intent of this tool is to initially focus
everyone's energy on the most critical (Top 20%) plant assets in order to determine
the optimum maintenance strategy by first performing failure mode analyses, so that
PM/PdM optimization and Asset Health can then be applied.

The overall purpose of this tool is to provide a ranked list of assets in the plant to
determine the top 20% based on a standard set of criteria. The criteria are selected
· to represent the criticality of the equipment to the facility. Hence the name criticality

Five of the seven criteria columns correlate with specific fields in the Isograph
Availability Workbench. This correlation allows the Reliability Engineer to import the
· information into Avsim with little effort. Additional information about the specific
AvSim field is listed in the comments for the column title.

The "granularity" or spread of the criticality scores is a function of the number of
questions asked and the range of each question. The actual sum is not important,
· from 1-764, but the ranking of equipment is important. Note that there may be
multiple equipment ID's that have the same criticality.

Echelon level 1 is nearest to the · system and may represent spares stored ‘on site’ for a process plant. The model above may be useful to think about when discussing this factor to insure which issue you concerned with. for example. The AvSim module contains a powerful spare part tracking algorithm that allows spare parts to be traced through three echelon levels. Level 2 is the next available level and may represent spares stored at a ‘depot’. The Spares Lead Time criteria is used to estimate several fields in the AvSim. The repair shop may be used to re-cycle spares into the echelon hierarchy. The spares criticality ranking can be used to estimate the Logistics delay time in any of the 3 levels. Level 3 is used to represent the source of the spare (e. factory) from which the other echelon levels and system are re-supplied. or at a local vendor in town. or ‘on board’ for a ship etc. The general description for the stores system in AvSim is included for reference. .g.

ASSET CRITICALITY ANALYSIS SPREAD SHEET (ACASS Operational Severity Asset Number Level 5 (System) Level 7 (Asset) .

Safety Severity Environmental Severity Company Single Point Failure READ SHEET (ACASS) Maintainability Reliability Spares Lead Time Sum of Criteria Asset Criticality .

liquids or powders onto or into the soil or water within the plant. or criminal prosecution for failure to comply with local. dust clouds. curtailment. state. concrete floor. electrocution. 45 = Severe . such as nuisance dust or irritants. 48 = Serious injury or death/over exposure to a known carcinogen such as chrome 6. corrosive. Etc. 48 = High .We are subject to fines.Nuisance dust or mist collects on nearby equipment/floor.Hoisting or rigging equipment required 36 = Moderate . curtailment.25% 40 = 26 . Safety Severity Personal Injury Potential 00 = None 12 = Compliance Issue . silica or corrosives. corrosive. state. housekeeping issue. 30 = Moderate .liquids or powders onto the soil or into the water outside the plant. 36 = Moderate injury/over exposure to an irreversible health hazards such as. curtailment. or federal regulatio 24 = Low . smoke.Dust. Chemicals 0 = None .Fire can cause significant damage to equipment. or federal regulatio Single Point Failure . etc) 45 = Severe . or federal regulatio 24 = Low . curtailment. irritant. 12 = Compliance issue.No/Low safety issues while performing maintenance. irritant. emissions released outside building (asphyxiant. Based upon design capacity not market or schedule requirements. Safety During Maintenance 00 = None .Fall protection.50% 60 = 51 . or federal regulatio 24 = Minor injury/over exposure to reversible health hazards. smoke inside the building that can affect persons or equipment (asphyxiant.Fire/explosion can damage equipment and/or spread to adjoining equipment or structures. Fumes.99% 100 = 100% Number imports into AvSim Effects under the same name in the per occurrence table.Lubes. state. Smoke. state. sensitizers. complex or building seriously impacting business operations. or criminal prosecution for failure to comply with local. engulfment Environmental Severity Air Emissions . etc. or criminal prosecution for failure to comply with local. 30 = Moderate .Confined space. 60 = Compliance Issue . Gases. poisonous. oil fires.Dust. state.Dust.75% 80 = 76 .no chemicals 15 = Low . etc) 60 = Compliance Issue . poisonous. We are subject to fines. or criminal prosecution for failure to comply with local. 0 = None 15 = Low . CTP or asbestos Fire/Explosion Potential 00 = None 12 = Compliance Issue .Operational Severity How will failure effect the facility's ability to meet mission requirements? Based upon throughput reduction.catch pan. high pressure line break 48 = High . 00 = No Impact 20 = 1 . noise. molten metal pops’.Equipment won’t burn but sparks/flame may cause localized fire on or close to equipment.We are subject to fines. Cleaner/Degreasers. slow moving fluid (grease). fumes. 36 = Moderate . or federal regulatio Chemical Spills .We are subject to fines. fumes.We are subject to fines. metal fires. curtailment. or criminal prosecution for failure to comply with local. fluoride.

The options are Hot. Product of: Serviceable (must be easily repaired) and Supportable (must be cost-effectively kept in or restored to a usable condition) 00 = Serviceability is high and Supportability is high 25 =Serviceability is high or Supportability is high 50 =Serviceability is low or Supportability is low 100=Serviceability is low and Supportability is low Reliability Use the last two previous years data to determine the number of breakdowns or routine tasks performed on each asset. 00 = <1 week 20 = 1 to 3 weeks 40 = 3 to 6 weeks 60 = 6 weeks to 3 months 80 = 3 months to 6 months 100 = > 6 months . when the maintenance is performed in accordance with prescribed procedures and resources.Is there a way to minimize loss caused by failure? 00 = No Loss 20 = Redundant Auto 40 = Redundant Manual 60 = Work around possible 80 = Reduced capacity 100 = Complete Loss This field helps identify the type of standby in AvSim under the Block properties and the rules tab. Maintainability Maintainability is a characteristic of design and installation. Cold and Warm. expressed as the probability that an item will be retained in or restored to a specified condition within a given period of time. 00 = No breakdowns/corrective 20 = 1 per year 40 = 2 per year 60 = 3 per year 80 = 4 per year 100 = > 5 per year Spares and Lead Time Time required to repair parts or obtain replacement parts in an emergency.

state.with local. or federal regulations or agreements . state. silica or corrosives. etc. s. with local. or federal regulations or agreements with local. lten metal pops’. or federal regulations or agreements. ness operations. dust clouds. or federal regulations or agreements. etc) with local. with local. state. oil fires. corrosive. irritant. state. poisonous. or federal regulations or agreements. state. metal fires.