Repeated pump failures are rarely “bad luck.” In many industrial systems, the real culprit is a transient event that happens fast, travels far, and leaves behind damage that looks like a mechanical issue: pressure surges (often called surge pressure) and water hammer.
In this article, you’ll learn what pressure surges are, why your existing instrumentation may miss them, and how KSB’s SES System Efficiency Service can identify pressure surges as a root cause of damage—using high-sample-rate, on-site measurements that make the invisible visible.
Pressure surges and water hammer: what they are (plain English)
A pressure surge (surge pressure) is a rapid change in pressure in a piping system caused by a sudden change in flow velocity—often due to valve actions, pump trips, or operating changes. The result is a pressure wave that travels through the pipeline and can impose very high loads on equipment.
A specific and common form of this phenomenon is water hammer: a violent surge pressure event that can occur when separated fluid columns collide again, or when flow changes abruptly.
If you want the engineering definitions, KSB has clear references for both terms: surge pressure and water hammer.
Why pressure surges are hard to diagnose
Most plants rely on DCS/SCADA trend data and “normal” process instrumentation. That’s necessary—but it’s often not sufficient for surge problems, because:
- Transient events can happen in milliseconds.
- Your system may only record pressures at relatively slow intervals (seconds or longer).
- The damage may show up later (bearings, seals, rubbing contact), long after the transient passed.
So operators see repeated failures, but the trends look “normal.” That’s when targeted, high-resolution measurement becomes a decisive advantage.
Real-world example: SES identifies pressure surges as the cause of damage
In a KSB reference case from a chemical park, two mag-drive pumps in a reactor cooling circuit suffered two successive major failures, impairing process flows.
The key challenge: the plant’s existing process control data did not show irregularities. Yet the pumps showed clear symptoms of abnormal forces (including rubbing contact and destroyed plain bearings).
KSB performed a comprehensive damage analysis and high-sample-rate measurements in a potentially explosive atmosphere (Zone 1). Those measurements revealed pressure surges propagating through the system in the millisecond range—fast enough that they could not be detected by the existing process control system.
The result: KSB found that the pressure surges occurred at specific times when steam was fed into the circuit to increase fluid temperature. With that timing correlation, the plant and KSB could define measures to prevent the surges.
You can read the full story here: SES System Efficiency Service in a chemical park.
What SES System Efficiency Service actually does (and what you get)
Think of SES System Efficiency Service as a structured, measurement-driven way to answer two business-critical questions:
- “Is our pump system operating efficiently?”
- “What is really causing our failures and damage?”
SES combines on-site logging of process variables and vibration with engineering analysis, resulting in a report and action plan.
What SES measures on site
Depending on the application, SES can capture the variables that matter for both efficiency and reliability, such as:
- Pressure
- Flow rate
- Effective power (to calculate efficiency)
- Rotational frequency
- Fluid and bearing temperature
- Vibration velocity and frequency spectra (for diagnostics)
(Overview and portfolio: SES System Efficiency Service.)
What SES delivers
SES is designed to produce outcomes, not just data. Typical deliverables include:
- A clear diagnosis of operating behavior and deviations
- Identification of optimization potential (energy + reliability)
- Identification of causes of damage using vibration analysis
- A practical action plan and economic efficiency view
- Verification of implemented measures via a follow-up measurement (where applicable)
A practical playbook: how to investigate suspected surge-driven damage
If your team suspects pressure surges (or you’re simply stuck with repeat failures), this flow helps you triage quickly.
Step 1: Look for event-driven patterns
Ask: “Do failures correlate with events?”
- Pump trip / power failure
- Valve closure/opening sequences
- Batch changeover operations
- Steam injection / rapid temperature changes
- Switching between parallel pumps
Step 2: Check symptoms that suggest abnormal forces
Surge-driven or transient-driven issues often come with symptoms such as:
- Rubbing contact marks
- Bearing distress earlier than expected
- Seal issues that don’t match normal wear patterns
- Vibration behavior that changes around operating events
Step 3: Confirm whether your sampling is fast enough
If your process historian samples “slowly,” you can miss the event entirely.
This is where SES-style high-resolution measurement can be decisive—because it’s built to capture the transient.
Step 4: Convert findings into mitigation
Mitigation is application-specific, but often falls into four buckets:
- Operating procedures: change sequences, ramp rates, or timing.
- Control strategy: adjust logic to avoid rapid changes in velocity/pressure.
- Hardware changes: add surge mitigation equipment or modify components.
- Modernization: improve controllability and monitoring for stability over the whole lifecycle.
Modernization may include variable speed operation and monitoring to maintain stability and keep pumps in their permissible operating range—see PumpDrive speed control and the smart monitoring service with KSB Guard.
How this links to energy efficiency (and why it matters)
Surge problems aren’t just reliability problems. They often coexist with:
- Oversized pumps
- Throttled valves
- Unstable operation
- High vibration and unnecessary wear
A structured assessment approach supports both reliability and energy goals. For example, the U.S. Department of Energy provides the Pumping System Assessment Tool (PSAT) as a way to estimate pumping efficiency improvement potential, and ISO energy management programs (like ISO 50001) provide a framework to continually improve energy performance.
If you’re building a broader program, it can also help to align assessments with standards such as ASME’s energy assessment approach for pumping systems.
When to involve KSB SupremeServ
If you have repeat failures, unexplained damage, or a system that “looks normal” in trends but keeps breaking, it’s time to bring in a measurement-driven diagnostic team.
Start here:
- Learn what SES covers: SES System Efficiency Service
- Explore KSB’s service capability (US): KSB SupremeServ across the US
FAQ
What is the difference between pressure surge and water hammer?
“Pressure surge” (surge pressure) is the broader term for transient pressure waves caused by changes in flow velocity. “Water hammer” is a common, often violent form of surge pressure that can occur when fluid columns separate and then collide again, or when flow changes abruptly.
Can my DCS or SCADA detect pressure surges?
Sometimes—but not always. If the sampling rate is too slow, the surge can pass between samples. That’s why high-sample-rate measurements are often required for root cause identification.
Does SES only apply to KSB pumps?
SES is a system-focused service. The goal is to understand how your installation behaves and what forces act on the pump set in real operation.
What should I do first if I suspect surge-driven failures?
Document the timing of failures and correlate with operating events (valves, pump trips, steam-injection steps, switchovers). Then plan targeted high-resolution measurement to confirm (or rule out) transient pressure events.
Key takeaways
- Pressure surges can be the hidden cause of repeated pump damage.
- Transients may occur too fast for normal process trending to reveal.
- SES System Efficiency Service can capture high-resolution process and vibration data to identify root causes and define mitigation measures.
If you want, I can also draft a short checklist PDF-style one-pager (operator-friendly) that your maintenance team can use during the next suspected surge event.