Connectivity represents something much larger than component compatibility. It is the foundation for standardization, predictability and control. Every connection influences whether a process can be reliably transferred, consistently executed and confidently scaled. When done right, early process decisions can translate to accelerated progress across development and scale‑up.
For organizations developing mAbs, mRNA therapies, antibody-drug conjugates (ADCs), multispecific antibodies and cell therapies—process robustness, technology transfer and manufacturing scalability increasingly rely on the effectiveness of single-use assemblies. Yet one factor remains consistently underestimated: physical connectivity or fluid management. The tubing, connectors, sensors and fluid transfer paths that link unit operations together can have a profound impact on flow behavior, process consistency, scalability and regulatory compliance.
As therapies become more complex and manufacturing networks expand across sites, every connection point in a process becomes a potential source of variability. These connectors are not merely passive components. Together, they define how material moves through a process, how consistently the process performs and how easily it can be transferred, replicated and scaled.
The challenge is that bioprocesses may evolve over time based on modality-specific requirements, which means incorporating new equipment or retrofitting technologies. A straightforward process can then become a patchwork of connection types, tubing dimensions, materials and supplier specifications. As manufacturers document deviations and are forced to troubleshoot flow inconsistencies and validate component changes, they’re left repeatedly asking the question, Why does this process behave differently here than it did there?
Physical connectivity is not simply about ensuring components fit together, it’s ensuring that the entire manufacturing system functions together. The performance of a process is influenced not just by a connector, tubing segment or flow kit, but by how all the elements of the fluid pathway interact as an integrated system. Small decisions made upstream can have significant consequences downstream. In this article, we discuss a few examples of why connectors can’t be chosen with only one piece of the process in mind.
End-to-end fluid management: why flow kits can’t be designed in isolation
In modern biomanufacturing, every transfer step must behave as expected. Unexpected flow behavior can result in batch delays, troubleshooting efforts, product loss or deviations that impact manufacturing efficiency. Yet flow path design decisions are often evaluated at the equipment level rather than at the process level. Because fluids do not recognize equipment boundaries, the performance of a flow kit is influenced by the entire transfer system surrounding it. Designing flow kits in isolation can therefore create hidden risks that are not discovered until the process is operating under real manufacturing conditions.
A common misconception in bioprocessing is that a flow kit can be designed around the requirements of the processing unit alone. The entire fluid transfer pathway within this skid, from the origin through the flow kit and to the destination, must be considered. Take, for example, a chromatography skid with a flow kit designed around a bore size of “X.” In chromatography, bore size refers to the internal diameter (ID) of the tubing. At first glance, it may seem reasonable to use X as the bore size through the system. However, many manufacturing facilities operate with long transfer distances between buffer preparation areas and process skids. Over those distances, pressure losses can become significant.
In these cases, MSAT and process engineers may intentionally specify a bore size larger than X, even though this is larger than the bore of the system flow path itself. The larger tubing diameter helps reduce pressure drop across long runs, minimizing the risk of cavitation, tubing collapse, pump performance issues and process interruptions.
A successful design requires consideration of the entire transfer pathway, including:
- Mixer bag and tote outlet sizes
- Tubing diameters across transfer distances
- Transfer set configurations
- Pump requirements
- Pressure-drop limitations
- Aseptic connector sizing
- Final flow kit geometry
What appears to be a simple tubing selection decision is often a system-level engineering decision. For organizations seeking predictable manufacturing performance, every connection point must be considered within the context of the complete process. A well-designed fluid management strategy accounts not only for the flow kit itself, but also for the entire network of components that deliver fluid to and from the process (Fig 1).
Fig 1. Cytiva’s Batch 360™ service collaborates with you to design a single-use consumable package optimized for your end-to-end manufacturing workflow.
Many connectivity challenges are not discovered when a component is selected. They are discovered during scale-up, technology transfer or commercial manufacturing. Cytiva works alongside you to design, evaluate and optimize manufacturing systems with the goal of reducing complexity, improving standardization and creating more robust processes from development through commercial production. Visit Cytiva Integrated solutions to find out more and read the rest of the article here
