When a mechanical seal leaks or a pump component becomes damaged, the immediate response is understandably focused on the affected component.
The equipment needs to be inspected, and an appropriate repair needs to be carried out.
But there is another question that maintenance teams should consider: Why did the component fail?
Replacing a damaged component may return equipment to operation, but if the underlying conditions that contributed to the problem remain unchanged, the same or a related issue may occur again.
This is why pump and mechanical seal troubleshooting should consider the wider system rather than looking only at the component where damage is visible.
A Failed Component Can Be the Result of a Wider Problem
Industrial pumps do not operate independently.
They form part of systems incorporating pipework, valves, motors, instrumentation and other equipment, all operating under particular pressure, flow and process conditions.
Mechanical seals are similarly influenced by the equipment in which they operate.
When a component fails, there can then be several potential contributing factors.
Henry R Ayton's previous guidance on rotating equipment, for example, identifies possible causes of abnormal vibration including shaft misalignment, bearing wear, impeller damage, mechanical looseness and cavitation.
Visible leakage can also require investigation beyond simply identifying that liquid is escaping.
The important point is that the location where a problem becomes visible is not necessarily the location where the underlying issue began.
Repeated Replacement Is Not the Same as Diagnosis
Consider a component that has been replaced several times.
If each replacement experiences a similar problem, continuing to install another equivalent component without investigating the surrounding equipment may not address the underlying issue.
Maintenance teams should instead consider whether something about the application, equipment condition or operating environment is contributing to the recurring failure.
This does not mean that every component failure indicates a complex system problem.
Components wear and require maintenance.
However, recurring or unusual failures justify a more detailed investigation.
The objective is to distinguish normal maintenance requirements from symptoms of another issue.
Start With the Evidence
Troubleshooting should begin with the information available.
The failed component itself can provide useful evidence, but so can maintenance history and observations from operators or technicians.
Questions worth considering can include:
- When did the problem first become apparent?
- Did equipment behaviour change beforehand?
- Has vibration increased?
- Have pressure or flow conditions changed?
- Was unusual noise observed?
- Has the pump recently been maintained or adjusted?
- Is the problem recurring?
- Have other components shown signs of wear?
No individual question will necessarily provide the answer.
Together, however, they can help maintenance teams develop a clearer understanding of what was happening when the problem occurred.
Consider the Operating Point of the Pump
A pump's performance depends on the system in which it operates.
For centrifugal pumps, the relationship between flow and head is represented by the pump performance curve. The actual operating point is determined by the interaction between the pump and system.
This is why understanding operating conditions matters when investigating equipment problems.
If system requirements have changed, the pump may no longer be operating under the conditions originally expected.
Changes to pipework, valves, process requirements or other parts of the system can potentially alter operating conditions.
Rather than examining the pump purely as an isolated piece of machinery, maintenance teams should consider how it is interacting with the process around it.
Mechanical Seals Need the Correct Operating Conditions
Mechanical seals perform an important function in controlling leakage where a rotating shaft passes through pump equipment.
However, the mechanical seal does not operate independently of the pump.
Seal performance can be influenced by the condition and behaviour of the equipment around it, as well as by the suitability of the seal for the application.
Factors such as shaft movement, vibration, installation and operating conditions can therefore be relevant when investigating seal problems.
If a mechanical seal repeatedly experiences problems, simply fitting another seal may not provide a complete answer.
The pump and its operating conditions should also be considered.
Look at Vibration and Mechanical Condition
Vibration is another useful source of information when investigating rotating equipment.
A change in vibration does not automatically identify a particular fault. It indicates that something may have changed, and further investigation could be required.
Potential causes can include issues associated with alignment, bearings, impellers, mechanical looseness or operating conditions.
This demonstrates why maintenance diagnosis benefits from considering multiple sources of information.
A leaking seal, unusual noise and increased vibration occurring together provide a different maintenance picture from an isolated component reaching the end of its normal service requirement.
Pressure and Flow Can Provide Additional Context
Process information can also contribute to troubleshooting.
Pressure and flow measurements can help engineering teams understand the conditions under which a pump is operating.
Changes in these measurements may indicate that operating conditions have altered, although further assessment is required to establish the reason.
This is another reason why instrumentation, maintenance records and physical equipment inspection work best when considered together.
Each provides a different part of the operating picture.
Use Maintenance History to Identify Patterns
A single maintenance event provides information about one point in time.
A well-maintained equipment history can reveal much more.
Recording servicing activity, components replaced, observed damage, operating issues and previous repairs can help teams identify patterns across the life of an asset.
If the same component has required repeated attention, maintenance records make that pattern easier to recognise.
Likewise, if problems began following a process or equipment change, historical information can provide useful context for the investigation.
This turns maintenance records into more than administrative documentation. They become a practical troubleshooting resource.
Refurbishment Provides an Opportunity for Assessment
When a pump or mechanical seal is removed for refurbishment, the process provides an opportunity to inspect its condition.
Rather than automatically treating refurbishment as replacement of worn components, inspection can help identify evidence that may be relevant to understanding how the equipment has been operating.
The appropriate action will depend on what is found and on the requirements of the application.
Henry R Ayton provides pump refurbishment, mechanical seal refurbishment and cartridge seal refurbishment alongside its wider industrial maintenance services.
Combining inspection and refurbishment with knowledge of the equipment and application can support a more informed maintenance approach.
Treat the Equipment as Part of a System
Industrial maintenance is rarely about one component in complete isolation.
Pumps interact with pipework and processes. Mechanical seals interact with pumps and shafts. Bearings, motors and other rotating components influence equipment behaviour.
When problems recur, examining these relationships can help maintenance teams move beyond treating the immediate symptom.
The aim is not to make troubleshooting unnecessarily complicated.
It is to ensure that maintenance addresses the actual problem wherever possible.
Replacing the damaged component may still be part of the solution, but understanding why it became damaged provides a stronger basis for deciding what should happen next.
Pump and Mechanical Seal Support from Henry R Ayton
Henry R Ayton supplies and supports industrial pumps and mechanical seals alongside a range of specialist maintenance and refurbishment services.
These include pump refurbishment, mechanical seal refurbishment and cartridge seal refurbishment, supported through its service capabilities in Ireland.
For engineering and maintenance teams experiencing recurring pump or seal problems, considering the wider operating system can provide valuable context when determining the appropriate next step.
Instead of asking only “What failed?”, it can be useful to also ask “What caused it to fail?”
To discuss pumps, mechanical seals, refurbishment or industrial maintenance requirements with Henry R Ayton, contact:
Cork: +353 21 4853000
Dublin: +353 1 4517922
Belfast: +44(0)28 9061 8511
Email: sales@hrayton.com
