A Practical Guide to Faster, Repeatable Tank Cleaning
Cleaning is an essential part of any sanitary mixing process. For manufacturers producing food, beverages, pharmaceuticals, nutraceuticals, cosmetics, personal care products, and other sensitive formulations, cleaning has a direct impact on production capacity, product quality, labor requirements, and operating costs.
Clean-in-Place, commonly called CIP, provides a way to clean and sanitize the internal surfaces of mixing tanks, piping, and associated process equipment without manually disassembling the system after every production run.
A properly designed Clean-in-Place system circulates cleaning, rinsing, and sanitizing solutions through the equipment and process paths used during production. The result is a controlled and repeatable cleaning process that can reduce turnaround time between batches and help manufacturers make better use of their production equipment.
How Does CIP Work?
A CIP system uses a combination of fluid movement, cleaning chemistry, temperature, and time to remove product residue from process surfaces.
Cleaning solution is pumped through the system and directed across the interior surfaces of the mixing tank using spray devices. The solution drains from the vessel and continues through the cleaning circuit according to the system design.
A typical CIP process may include:
- A pre-rinse to remove loose product and residue
- A heated cleaning cycle using the appropriate cleaning chemistry
- A water rinse to remove the cleaning solution
- A sanitizing cycle when required by the application
The exact sequence, chemistry, temperature, and duration depend on the product being processed and the facility’s cleaning requirements. Automated CIP systems can control these variables to create a repeatable cleaning cycle from one production run to the next.
Spray Devices and Tank Coverage
Getting cleaning solution into a tank is relatively simple. Making sure that solution reaches the required product-contact surfaces takes thoughtful engineering.
Spray balls and other spray devices distribute cleaning solution throughout the interior of the vessel. Their location, spray pattern, flow requirements, and operating pressure should be selected based on tank diameter, height, internal components, and the required level of cleaning.
Mixing tanks can contain agitator shafts, impellers, baffles, instrumentation, probes, fittings, and other components that influence how cleaning solution moves through the vessel. The CIP system needs to account for these features so cleaning solution can reach the surfaces around them.
This becomes especially important in sanitary applications such as pharmaceutical mixing and storage, where cleanability is an important part of the overall process design.
Flow Rate and Pressure Work Together
CIP performance depends heavily on delivering the appropriate combination of flow and pressure to the spray devices and process piping.
Flow rate determines how much cleaning solution moves through the system, while pressure influences how that solution is delivered through the spray device. The correct combination depends on spray technology, tank geometry, piping configuration, and cleaning requirements.
Several components need to be considered together when designing the cleaning circuit:
- Pumps and available flow rates
- Piping diameter and configuration
- Valves and potential flow restrictions
- Spray device requirements
- Tank geometry and internal components
A change in one area can affect performance elsewhere in the system. This is why CIP requirements are best established during mixing tank design rather than after the vessel has already been fabricated.
Drainability Is Part of Cleaning
Effective CIP requires cleaning solution and product residue to leave the tank efficiently.
Tank bottom geometry, outlet location, piping layout, and equipment orientation all influence drainability. Areas that retain liquid can increase rinse requirements and make it more difficult to achieve a consistent cleaning cycle.
Good sanitary design encourages complete drainage and minimizes areas where product or cleaning solution can collect.
Drainability also benefits everyday production. A vessel that drains efficiently can reduce product loss, simplify changeovers, and decrease the amount of material remaining in the system at the end of a batch.
Surface Finish Makes a Difference
The condition of the product-contact surface affects how easily residue can be removed.
Sanitary stainless steel provides a durable, non-reactive surface that can be finished for applications requiring consistent cleanability. Smooth interior surfaces and properly finished welds reduce areas where product can accumulate and make the cleaning process more predictable.
Surface finish requirements should reflect the product, cleaning method, and production environment. MTUSA custom mixing and storage tank applications can incorporate sanitary interior finishes, CIP capabilities, heating and cooling, specialized fittings, and other process requirements into the vessel design.
Understanding Shadow Areas
Shadow areas are locations where internal equipment or vessel geometry interferes with cleaning solution reaching a product-contact surface effectively.
Agitators, baffles, probes, fittings, and other components can influence spray coverage. Their placement should be considered alongside the location and performance of the CIP spray devices.
During system design, engineers should evaluate areas around:
- Agitator shafts and impellers
- Baffles and internal supports
- Instrumentation and probes
- Inlets, outlets, and fittings
- Tank heads and other geometric transitions
The goal is consistent cleaning coverage throughout the vessel while maintaining the process functionality required during production.
Cleaning Cycles Should Match the Process
Cleaning requirements can vary significantly from one application to another.
Food residue, proteins, sugars, oils, botanical ingredients, creams, gels, and pharmaceutical formulations present different cleaning challenges. Cleaning chemistry, temperature, circulation time, and rinse requirements should reflect the materials being processed.
Frequency matters as well. A facility producing one formulation repeatedly may have different cleaning requirements than a co-packer, toll manufacturer, or CDMO changing products several times per day.
Automated controls can manage cycle time, temperature, and other operating parameters to help create repeatable results while reducing operator variability.
CIP and Production Efficiency
Cleaning time is part of the production schedule. Every hour required to prepare a tank for the next batch affects the amount of product a facility can manufacture.
A properly designed CIP system can shorten changeovers, reduce manual cleaning labor, improve cleaning consistency, and return equipment to production faster. Automated cleaning can also help facilities manage water and cleaning solution usage more consistently.
These benefits become particularly important for operations running multiple batches, products, or formulations each day. Over the life of a mixing system, even modest reductions in cleaning and changeover time can create meaningful gains in available production capacity.
Design CIP as Part of the Mixing System
CIP performance is closely connected to tank geometry, agitation, piping, controls, surface finish, and production requirements. Addressing these elements together creates a cleaning system that supports the overall process.
Mixing Tanks USA designs stainless steel mixing and storage tanks and integrated process systems around the complete application, including how the equipment will be operated, cleaned, and prepared for the next production run.
If you are planning a sanitary process, expanding production, or replacing existing equipment, contact Mixing Tanks USA for a quote on your next mixing and storage tank project. Our team can review your process and help develop equipment with cleaning, production, and long-term operational requirements incorporated into the design.
About Mixing Tanks USA
Mixing Tanks USA is an American manufacturer of stainless steel mixing and storage tanks and liquid process systems serving the food and beverage, life science, and industrial and chemical industries.
Our equipment is manufactured in Portland, Oregon, with a focus on precision engineering, quality fabrication, dependable performance, and long-term customer support. We design standard and custom equipment around the products, processes, and production goals of the manufacturers we serve.