Use monitoring to optimize maintenance strategies.
by Jack Creamer
July 16, 2018

If you had researched the Industrial Internet of Things (IIoT) online in the mid-1990s, there may have been a handful of results. Now, maintenance automation is finally gaining a foothold in industry, but it is being held back from realizing its full potential by limited access to the contextual data related to items like pump wear and pump system performance degradation. As more industrial devices gain intelligence and internet connectivity, their data histories are increasingly exposed, offering advanced maintenance applications a richer supply of data for analysis.

CISCO projects that more than 50 billion things will be connected to the internet by 2020, resulting in more traffic, more data, more storage and more energy consumption.1 Looking at this from an industrial perspective, IHS reports that only 9.1 percent of the more than 23.8 billion process and discrete automation elements are currently networked, but the compound annual growth rate of such deployments will increase to 24.1 percent in 2019.2

As an example of how increasing digitization might improve pumping system operations, some industry experts look to improve communications between drives and pumps. Pumps are typically dumb assets. They turn based on the amount of electricity supplied to them.

But if the pump operating curve can be imbedded into a drive, when the drive sends electricity down into the pump, it knows how fast the pump should be turning. If the pump is not fitting the profile, the drive can contact someone to find out why.

Increasing digitization of this sort will impact maintenance at all levels: reactive, preventive, predictive and prescriptive.3

smart pumpingImage 1. Smart pumping room (Images courtesy of Schneider Electric)

Reactive maintenance, a process in which things are not fixed until they break, is probably the most widely applied maintenance strategy. While reactive maintenance may not add costs in the short term, it can potentially contribute to higher lifetime costs, including the cost of diagnosing, fixing, testing, etc., as well as the cost of downtime during the operation. However, IIoT can improve reactive maintenance by enabling a more efficient, more informed response.

On the other hand, in a more connected environment, maintenance engineers or technicians could be sitting in front of their computers when an alarm goes off at a remote pump site, such as a commercial building or upstream well. Instead of taking the time to travel to that remote location, they can view a supervisory screen that will alert them to the condition. Within a click, they can see the documentation and review the codes, and then they could connect to the programmable logic controller (PLC) that is managing it. By doing this, operators can see what is going on within the actual program of responses and determine whether it is a programming issue, a hardware issue or something else.

For example, if it is a broken pump, they might be able to configure it from their desk. If parts are needed, they would have instant access to spare inventories or a simplified ordering process. They could then engage local maintenance personnel to address the issues.

Limitations of Preventive Maintenance

Preventive maintenance has been shown to reduce costs over the lifetime of the asset, but it has its limitations. Preventive maintenance is based on the assumption that assets deteriorate at predictable rates based on age and utilization, which is valid. But the ARC Advisory Group points to U.S. Navy research showing that only 18 percent of equipment failures result from aging equipment. Preventive maintenance will not necessarily address the other 82 percent of random operating failure causes. However, IIoT may improve tracking, scheduling and other aspects of preventive maintenance, and promises to enable condition monitoring based on the analysis of complex variables.

types locationsImage 2. Types of locations that can take advantage of smart pumping

Delivering Predictive & Proactive Maintenance

Predictive and prescriptive (sometimes called proactive) maintenance strategies stand to gain the most from IIoT. In both approaches, process data is monitored to identify trends and issue alerts prior to failure. Predictive condition monitoring, as defined by ARC, is most appropriate for
simple systems, where single variable math can be used to predict failure. More complex systems involve prescriptive condition monitoring where multiple variables are analyzed to predict failure.

The advanced data historians and analytical software needed to deliver the potential of IIoT are already in place to help process the deluge of operating data that could be flowing in. Today’s data historians can collect data for analysis and report on asset operations, health, maintenance and regulatory compliance. They can collect continuously streaming time-series data from critical control, monitoring and smart devices, then archive this data—increasingly in the cloud using advanced storage and compression technologies.

IIoT makes it possible for more companies to achieve measurable benefits within the pumping system, while extending the possibilities as well. It enables the real-time collection of data on the system operation, which can extend the lifespan of any pump asset and reduce capital expenses. Improved operating data helps capture the knowledge of experienced workers, which flattens the learning curve for new hires and helps minimize unplanned downtime.

Maintenance Benefits

The following five trends are converging around IIoT to help more companies achieve maintenance benefits: