Uncovering Hidden Fault on Critical Pump at a Phenolic Resin Production Plant

In chemical processing environments, apparent normal operation does not necessarily mean mechanical health.

At our client's phenolic resin production facility, a caustic pump critical to plant operations appeared to be running normally. There was no excessive noise, no abnormal heat signature, no visible vibration, and process flow readings were within expected parameters.

However, production depended entirely on this pump. If it failed, production would stop.

The risk was present, but invisible.

Rapid Deployment and Immediate Visibility

To strengthen reliability across critical assets, the client implemented Sensoteq Kappa X triaxial vibration and temperature sensors across production-critical equipment. The objective was to gain deeper mechanical visibility beyond traditional process instrumentation and reduce exposure to unexpected failure.

The deployment was straightforward. Gateways were pre-installed and communications verified before sensor mounting. Installation was completed during a single morning shift with no interruption to production.

Data was available within minutes in Analytix, Sensoteq’s machine health intelligence platform, enabling engineers to begin analysing vibration patterns and asset condition immediately.

Within weeks, this data was aligned with the site’s digital twin environment, enabling correlation between process variables, such as flow and pressure, and real-time mechanical condition indicators.

Close to Failure: Early Detection of a Hidden Issue

Less than one month after installation, Sensoteq’s intelligent fault diagnosis feature – Diagnostix - automatically alerted site engineers to a developing vibration pattern indicative of misalignment and rotating looseness.

There were still no obvious external symptoms. Process indicators remained stable. But spectral analysis and trend behaviour triggered a predictive maintenance work order.

This early alert proved critical.

Inspection Findings: Fault Confirmed

Upon investigation, engineers identified significant mechanical degradation:

• The coupling element had lost approximately 5 mm of material on each internal spline face

• External wear patterns were uneven, confirming substantial misalignment

• Laser alignment measurements revealed greater than 1.5 mm misalignment, with both step-out and angular offset present

The coupling had progressed to the point of failure.

The coupling element was replaced, the pump was precision-aligned, and the asset was returned to optimal operating condition.

Operational Risk and Exposure: High Consequence Asset

This pump, while relatively small, was critical to operations.

There was no spare pump end available on site. Only a motor spare was held. A mechanical failure would therefore have resulted in significant operational disruption. Replacement pump lead time was three weeks.

Had the issue progressed to failure, the likely consequences included:

• Reduced flow and declining process efficiency

• Increased energy consumption due to misalignment losses

• Accelerated wear and more frequent maintenance interventions

• Elevated risk of sudden catastrophic failure

• Shortened service life of both pump and motor

In a continuous phenolic resin production environment, this represented a material operational and financial exposure.

Return on Investment | < 30 Days

By intervening before failure, the client avoided:

• 50 hours of production downtime

• $67,000 USD from production loss

• $11,000 USD for part replacement

• Emergency procurement and reactive maintenance escalation

Equally important was timing. The fault was identified within the first 30 days of system deployment, demonstrating immediate value realisation.

From Reactive to Predictive Reliability

This event marked more than a single avoided failure. It represented a transition in maintenance philosophy.

The site now benefits from:

• Continuous 24/7 monitoring at three-minute data intervals

• ATEX-compliant wireless technology, eliminating hazardous-area cabling

• Integrated analysis of process and mechanical condition data

• Predictive work order generation based on trending and diagnostic algorithms

Rather than reacting to a breakdown, the team can plan intervention based on condition.

Key Reliability Takeaway

This case reinforces a critical reliability principle.

Process Stability ≠ Mechanical Integrity

Without vibration monitoring, the misalignment and rotating looseness would likely have remained undetected until performance degradation or sudden failure occurred.

By acting early, the client protected production continuity, reduced operational risk, and strengthened its predictive maintenance strategy.

What’s the biggest challenge affecting your asset reliability today? Unplanned downtime? Limited machine visibility? Rising maintenance costs?

At Sensoteq, we help businesses improve reliability through smarter condition monitoring and proactive maintenance solutions.

Get in touch with our team today to discover how we can help reduce downtime, improve visibility, and keep your operations running efficiently.