Learn how Clean-in-Place (CIP) systems work and why manual cleaning remains essential.
Clean-in-Place (CIP) is an essential part of food manufacturing, providing a reliable and efficient way to clean processing equipment without the need for dismantling.
However, an effective CIP system involves more than simply running a cleaning cycle. To achieve consistent hygiene standards, manufacturers must understand how CIP works, how cleaning effectiveness is verified, and where the limits of the process sit.
In this guide, we’ll explore the key principles behind Clean-in-Place systems, including the importance of validation, hygienic design, and manual cleaning controls.
What is Clean-in-Place (CIP)?
Clean-in-Place (CIP) is the standard method for cleaning the inside of tanks, pipework, valves, and other processing equipment without the need for dismantling. Instead of taking equipment apart, cleaning and sanitising solutions are circulated through the system in a controlled sequence, helping to remove product residues and maintain hygienic production conditions.
A typical CIP cycle includes several stages:
- A pre-rinse to remove loose product residues.
- A hot alkaline (caustic) wash to break down fats and proteins.
- An intermediate rinse to flush away the cleaning solution.
- An acid wash, where required, to remove mineral deposits and scale.
- A final rinse.
- A sanitising step before production resumes.
Time
How long the cleaning solution remains in contact with the equipment.
Action
The mechanical cleaning effect created by the flow of the solution.
Chemistry
The type and concentration of the cleaning chemicals.
Temperature
The heat of the cleaning solution.
What is TACT?
The effectiveness of a Clean-in-Place (CIP) system is determined by four key factors, commonly known as TACT:
- Time: how long the cleaning solution remains in contact with the equipment.
- Action: the mechanical cleaning effect created by the flow of the solution.
- Chemistry: the type and concentration of the cleaning chemicals.
- Temperature: the heat of the cleaning solution.
These factors work together. If one is reduced, such as cleaning time, another may need to be increased to achieve the same cleaning performance.
A validated CIP programme is designed to establish the right balance for each process, taking into account both the equipment being cleaned and the type of residue being removed.
How do you know your Clean-in-Place (CIP) Process has worked?
Most food manufacturers monitor CIP performance by reviewing cycle data such as time, temperature, conductivity, and flow. Many also use ATP testing or visual inspections before production resumes.
While these methods are valuable, they answer different questions. A validated CIP cycle confirms the cleaning process ran as intended, while ATP testing indicates the presence of general organic residue. Neither is designed to detect specific allergen proteins or individual pathogens.
ATP testing also has recognised limitations. During processes such as cooking, heating and fermentation, ATP naturally breaks down into molecules (ADP + AMP) that standard ATP tests cannot detect. As a result, a surface may pass an ATP test while still carrying residual organic material.
Similarly, a satisfactory ATP result does not necessarily mean allergen proteins have been removed. Trace allergen residues may remain below the test’s detection threshold while still posing a risk to the next production run.
The Importance of Hygienic Design
Even the best cleaning programme cannot overcome poor equipment design. Areas such as dead legs, hard-to-reach surfaces, poor drainage points, and hidden crevices can allow product residues and microorganisms to remain after cleaning.
This means CIP performance is not only determined by cleaning parameters such as time, temperature, chemistry, and flow. The design of the equipment itself plays a critical role.
By selecting equipment with hygienic design principles in mind manufacturers can improve cleaning reliability and reduce the risk of contamination. This includes:
- Smooth surfaces
- Effective drainage
- Avoiding equipment with areas/components that are difficult to clean
Where Clean-in-Place (CIP) ends and Manual Cleaning begins
A validated Clean-in-Place (CIP) process is a critical element of food safety, but it is only effective within its defined scope. Understanding the boundaries of CIP is essential to ensure that all areas requiring cleaning are identified and appropriately controlled.
CIP is designed to clean internal product-contact surfaces within equipment, including tanks, pipework, valves, and pumps. However, it does not replace the need for manual cleaning of areas that fall outside the automated process.
Equipment exteriors, floors, drains, changeover tools, and other manually cleaned components require separate cleaning procedures. If these areas are assumed to be covered by CIP, gaps in hygiene controls can occur, increasing the risk of contamination.
Manual cleaning should therefore be treated as an integral part of the overall hygiene programme. By clearly defining responsibilities, cleaning methods, and verification requirements, manufacturers can ensure that both CIP and manual cleaning activities work together to maintain effective hygiene standards across the site.
Managing Manual Cleaning Controls
If manual cleaning is required, segregation and traceability become critical. Equipment used in an allergen-controlled area, for example, may create a food safety risk if it is moved into another production zone without appropriate controls in place.
Visual controls play an important role in ensuring manual cleaning tasks are clearly understood and consistently completed. Colour-coded cleaning tools and shadow board storage systems make it immediately clear where equipment belongs and its intended application. This helps to prevent incorrect use, supports segregation, and reduces the risk of cross-contamination.
Cleaning Instruction Cards should also be used to provide clear guidance on cleaning requirements. These should include photographs and step-by-step instructions that define what needs to be cleaned, the correct cleaning method, and which areas fall within or outside the CIP process.
It is also important to identify areas that are frequently missed or present particular cleaning challenges. To drive continuous improvement, Visual Management Signs can be introduced to highlight best-practice examples, cleaning steps, and key responsibilities.
When CIP and manual cleaning controls work together, food manufacturers can create a more reliable cleaning process that supports food safety, operational efficiency, and audit compliance.
If you have any questions about the guidance or solutions mentioned throughout this article, you are welcome to contact our team on 01473461800 or sales@klipspringer.com. Alternatively, you can share your details via the form below and we will be in touch.
If you have any questions about the guidance or solutions mentioned throughout this article, please share your contact details below.
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