A cavitating dairy transfer pump can teach valuable lessons about hygienic design, as Femi Olorunnaiye, a senior process engineer, discovered in a recent project. In viscous food systems, many apparent pump or controls problems begin with suction-side design, including long runs, restrictive instruments, abrupt fittings, and poor layout, which can quietly consume net positive suction head (NPSH) margin.
Diagnosing the Problem
A practical diagnosis should combine field observation with simple engineering checks, such as walking the suction path, estimating pressure-drop contributors, reviewing flowmeter sizing, and confirming whether controls are compensating for weak hydraulics. This approach helps identify the root cause of the problem, rather than just treating the symptoms.
In one case, a pump started sounding rough, flow became inconsistent, and operators intervened more often, prompting an investigation into the suction side of the system. The symptoms were familiar: a rattling or gravel-like sound during certain parts of the run, less stable transfer performance, and touchy startup.
Understanding the Pressure Budget
The most useful calculation in this kind of review is not complicated: net positive suction head available (NPSHA) is the suction energy the system gives the pump after static head, vapor pressure, and suction losses are accounted for. Net positive suction head required (NPSHR) is what the pump needs at a given flow rate. If the available value only barely clears the required value on a clean estimate, normal process variation can erase the margin quickly.
In viscous food service, the pump does not receive all of the static head available at the source vessel. Suction piping, fittings, elevation effects, and restrictive components consume part of that head before the product reaches the pump. The remaining inlet margin determines whether the pump operates with stable flooded suction or begins moving toward cavitation, air entrainment, and flow instability.
The fix was not glamorous, which is usually a good sign. Simplifying the suction geometry, reducing avoidable restrictions, and shifting the design toward a cleaner hydraulic path into the pump improved the system’s reliability and maintainability.
Improving Maintainability and Reliability
Using the redesign to improve maintainability was just as important: better access, fewer awkward inspection points, clearer assembly expectations, and a layout that was easier to clean and verify. In Olorunnaiye‘s experience, this is where reliability and food safety start to overlap in a useful way. If seals, fittings, and product-contact areas are hard to reach or hard to inspect, the risk is not only downtime but also inconsistent cleaning, assembly error, extra intervention, and a wider window for contamination or foreign-material introduction after maintenance.
Revisiting the controls was also necessary, but in a different order than many teams do. Instead of asking automation to rescue a poor hydraulic path, Olorunnaiye checked whether the logic was starting the pump into unstable conditions, ramping too aggressively, or encouraging operator workarounds. Once the suction side improved, the controls could do what they were supposed to do all along: stabilize a sound system rather than compensate for a fragile one.
For U.S. food manufacturers, the broader lesson is straightforward: if a viscous transfer loop is noisy, temperamental, or highly operator-dependent, do not start with software alone. Start with the suction side. Walk the line from source to pump. Ask what is stealing pressure before the liquid reaches the impeller or screw.
In food processing, the quietest pumps often tell the best story. They are usually connected to systems that respect pressure budget, product behavior, and the reality of maintenance on a live plant floor. When those three things come together, reliability improves, sanitation gets easier, and operators stop fighting the line.
According to the filing, food service is critical in this context.
It is a lesson that Olorunnaiye has learned through experience. They know that reliability and food safety are closely linked, and that a well-designed system can make all the difference.
The outcome is clear.
Food manufacturers can learn from Olorunnaiye‘s experience. They should prioritize the suction side of the system, and ensure that it is well-designed and well-maintained. This will help to improve reliability, reduce downtime, and prevent contamination.
As Olorunnaiye notes, the key is to respect the pressure budget, product behavior, and the reality of maintenance on a live plant floor. When these factors are taken into account, the result is a more efficient, more reliable, and safer system.
For example, General Mills has reported losses in the past, while McCormick has gained.
These companies understand the importance of a well-designed system, and the impact that it can have on their bottom line.
