How an IIoT-enabled maintenance maturity model works

Six actions that set the stage for better asset management.

02/25/2017


Knowledge base: underlying set of facts, assumptions and rules to solve a problem; algorithm: a formula, process or set of rules to be followed in calculations; machine learning: software that allows applications to learn. Courtesy: ARC Advisory GroupTo gauge IIoT impact on maintenance-related activities, it helps to revisit higher-level concepts related to maintenance maturity and associated definitions. ARC's recent review of current maturity models uncovered many different versions of it as well as many internal inconsistencies. The industry lacks a true standard to build upon. This lack of clarity makes it difficult to compare solutions, leading to confusion among potential users and delaying the application of solutions.

While industry participants generally have a good understanding of both reactive and preventive maintenance, we've encountered a variety of interpretations for condition-based, predictive-maintenance and prescriptive-maintenance approaches, and where IIoT comes into play. A clearer definition of these upper maintenance-maturity levels is needed for users to be able to better assess the available alternatives. 

Several type maturity models

Since first publishing the asset-management maturity model in an ARC report in 2015, we've taken a closer look at the impact of IIoT on it. We now classify maintenance maturity into five types or levels: reactive, preventive, condition-based, predictive, and prescriptive (See Diagram 1).

Reactive maintenance: Reactive, or run-to-failure, maintenance is the most common approach for equipment, since most assets have a very low probability of failure and are non-critical. This approach helps control maintenance costs, but is only appropriate for non-critical assets.

Preventive maintenance: Here, maintenance is performed based on either time (analogous to replacing the batteries in your household smoke detectors once a year), or usage (changing your car's oil every 5,000 miles). Preventive maintenance applies to assets with an age-related failure-pattern, where the frequency of failure for the asset increases with age, run-time, or number of cycles.

Condition-based maintenance: CBM involves monitoring a specific asset parameter. The focus tends to be the amplitude of the value, with vibration monitoring being the most common. CBM typically applies to production (rotating equipment) and automation (instruments and the control system) equipment. For stationary plant equipment, such as steam boilers, piping and heat exchangers, periodic inspections and condition evaluations are often used.

Predictive maintenance: PdM uses engineered algorithms and machine learning with multiple input parameters to provide higher accuracy (fewer false positives or missed issues) and more advanced warning before failure. It combines "small data" from a device or system with algorithms that model that type of equipment (sometimes called virtual equipment or a "digital twin") to monitor-condition and raise an alert when appropriate. This provides the more advanced notice needed to schedule and execute the maintenance during planned shutdowns.

Prescriptive maintenance: builds on PdM with alerts that provide diagnostics and guidance for repair. Information for determining the timing and impact of failure is also included to help assess priority and urgency. 

Potential benefits

Increasing maturity typically involves more engineering investment. For specific types of equipment, one benefit of the engineered algorithm or model for predictive and prescriptive maintenance is the ability to replicate it like a template across many similar devices-like doors on a passenger train or transformers in power transmission lines. This approach provides economies of scale and a basis for financial justification of the inherently larger engineering and development costs. (See Diagram 2)

Maintenance key performance indicators and associated executive metrics. Courtesy: ARC Advisory Group

Users have reported that moving from preventive maintenance to predictive or prescriptive approaches provides 50% savings in maintenance labor and MRO materials. With predictive and prescriptive maintenance, near zero-unplanned downtime for critical equipment can be achieved. This level of equipment reliability ripples into other significant business benefits, including improvements in on-time shipments, revenue, customer satisfaction, quality/yield, safety, and work-in-process inventory.

Unfortunately, maintenance and operations personnel tend to focus on cost reductions for labor and MRO materials to financially justify a project. A broader viewpoint with higher business impact usually gets executive attention and the resources needed to succeed. 

Where to go from here

IIoT allows organizations to move from manual inspections for collecting data, to automated systems. This vastly improves data quantity and quality, enabling improvements in maintenance strategies. How can you best leverage this capability to improve your organization's operating performance? ARC recommends the following actions for manufacturers and other industrial organizations:

  1. Use the updated maintenance maturity chart to communicate your strategy to others.
  2. Include the supplier's IIoT services in the selection criteria for sourcing new equipment.
  3. Get started with an IIoT project for critical equipment that has high visibility and has been problematic with significant business impact or safety/environment incidents.
  4. Leverage the initial success into a broader program to achieve near zero unplanned downtime for critical assets and broader business benefits.
  5. Establish a consistent set of IIoT technologies for the predictive and prescriptive maintenance applications to improve project sustainability.
  6. If your organization lacks technical and/or IT resources, engage with an appropriate local, regional, national or global service provider to support implementation.

Ralph Rio is vice president, enterprise software, ARC Advisory Group.



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