Maintenance Mindset: The tree branch test - what nature teaches us about industrial reliability

I try to get a long walk in everyday with my partner. As we walked in a shaded park I happened to look up at a branch of a large oak. It was not a particularly remarkable branch, but something about it caught my attention. I stopped and she said “What’s the matter?” I said “Check it out.”

Growing along the limb were several strands of Spanish moss. Nestled in a pocket of accumulated organic debris was a small Boston fern. The bark itself was covered with patches of pale green and gray lichen. 

She looked at me with the typical look I get often which means “oh no, here we go with a ‘Holloway’ observation again!”

At first glance it looked like a random collection of plants. But the longer you study something like that, the more you realize you are not looking at a plant at all. I said “You are looking at a system.”

The tree provides structure. The moss uses the branch for elevation. The fern takes advantage of trapped moisture and decomposing debris. The lichen itself is actually two organisms living together: a fungus providing structure and protection, and an algae providing energy through photosynthesis. 

A single branch of a tree can host dozens, sometimes hundreds, of living organisms interacting at the same time. Some relationships are mutually beneficial. Some are neutral. Some compete for space and resources. But collectively they form something larger than any one organism. They form an ecosystem.

When I looked at that branch, I was not thinking about botany, I was thinking about industrial equipment.

Machines Are Not Individual Components

One of the most persistent problems in maintenance and reliability is that we often think about machines as collections of individual parts.

• A pump has bearings.
• A gearbox has gears.
• A compressor has seals and valves.

When something fails, we tend to isolate the component and assign blame to that specific part:

• The bearing failed.
• The seal wore out.
• The gear broke.

But machines rarely fail because of a single component acting alone. They fail because systems interact. In many ways, industrial equipment behaves much more like that tree branch than we might realize.

A rotating machine, for example, is not just a shaft and bearings, it’s a layered environment that includes mechanical forces, lubrication chemistry, contamination, thermal gradients, and control systems. Each of these elements interacts with the others continuously.

The health of the machine depends on the stability of the entire system.

The Hidden Ecosystem Inside Machinery 

Consider a typical lubricated bearing system. Inside that bearing are several interacting processes occurring simultaneously. The rolling elements carry mechanical load. The lubricant forms a protective film between surfaces. Additives in the oil control oxidation and wear. Filters attempt to remove contaminants. Temperature affects viscosity and chemical stability. Then there are the external influences.

Dust enters through breathers, moisture condenses during shutdowns, and wear particles are generated during operation. Vibration alters contact conditions, and even maintenance practices introduce new materials or contaminants. Each of these elements affects the others.

A small increase in contamination can accelerate wear. Wear particles then increase friction. Friction raises temperature. Temperature accelerates oxidation. Oxidation degrades the lubricant. Before long the system moves from stable operation to failure. 

None of those processes operate independently. They behave more like a biological community interacting within a shared environment. In other words, machines have ecosystems too.

Mutualism, Commensalism, and Parasitism in Equipment

Biologists describe several types of relationships between organisms. Some relationships are mutually beneficial. Both organisms benefit from the interaction. Other relationships are neutral for one party but beneficial for the other. Still others are parasitic, where one organism benefits while the host is harmed.

Interestingly, these same relationship types appear in industrial systems. Lubrication and bearings represent a mutualistic relationship. The lubricant protects the surfaces from wear, while the mechanical system provides the operating environment that allows the lubricant to perform its function. 

Condition monitoring technologies can be thought of as commensal systems. Sensors, vibration monitors, and oil analysis programs benefit from the machine by gathering information, but they generally do not affect the operation of the machine itself. Contamination, however, behaves very much like a parasitic organism. Dirt, water, and wear debris enter the system and consume the protective capacity of the lubricant. They accelerate wear, degrade additives, and damage surfaces. 

Like parasites in biological systems, contaminants rarely improve the health of the host. They simply exploit it. This analogy may seem poetic, but it leads to a useful way of thinking about reliability.

Stability Is the Goal

Natural ecosystems survive when they achieve a stable balance between the organisms that inhabit them. Disturb that balance too much, and the ecosystem collapses. Industrial equipment behaves the same way.

Stable lubrication film thickness maintains separation between surfaces. Temperature remains within the design limits of materials and fluids. Contamination levels remain low enough that filtration and additive chemistry can manage the load. As long as those relationships remain balanced, the system continues to function. But when one part of the system shifts too far out of alignment, the entire machine begins moving toward failure.

This is why reliability engineering increasingly focuses on system behavior rather than individual component performance. When we monitor lubricant condition, measure wear particles, analyze vibration signatures, or track temperature trends, we are essentially studying the health of the ecosystem within the machine. We are looking for signs that the balance is beginning to shift.

The Reliability Lesson from a Tree Branch

Standing under that oak tree, it became clear that nature solved many reliability problems long before humans began building machines. Nature rarely relies on a single element. Instead, it builds layered systems that distribute function and maintain balance across many interacting components.

Industrial systems may be constructed from steel and polymers instead of living tissue, but the underlying principle is surprisingly similar. Machines survive when the relationships inside them remain stable. They fail when those relationships break down.

Maintenance professionals often spend a great deal of time focusing on individual parts. But the more useful question is often much larger: what is the condition of the entire system?

Because in the end, reliability is not the health of a component. Reliability is the stability of the ecosystem that surrounds it. 

Furthermore down the path we saw a squirrel interacting with a few ducks. I promised not to comment on their exchange or write an article about it. Sometimes you just have to let the tree own the day.