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As CIP is largely an automated cleaning process; modern CIP sets will integrate fail‐safe mechanisms to ensure the clean completes as expected, as well as providing protection to the operatives working in the area and product. As these fail‐safes are an integral part of the CIP process Holchem believes they should be periodically tested to ensure they react accordingly.
If we split these fail‐safes into four categories, namely; cleaning, product safety, health & safety, other and look in some more detail at what each fail‐safe is trying to achieve. Checking the function of a fail-safe needs to be carefully planned and done in conjunction with site engineers.
The following are often used to control the CIP stage timers, each of the following should be at its set point before the CIP will begin the timer for that stage of the CIP. A good CIP should also pause or hold the CIP if any of the set points falls outside the designated parameters during the CIP stage.
Routing is carried out using different methods, namely: flow plates, mix proof valve matrix or simple swing bends. Feedback on routing is essential to ensure that cleaning chemical cannot be mixed with product.
Health & Safety
Routing fail-safes discussed above are also important for health and safety reasons. If a route is incorrectly set the cleaning solution could leave pipework at a flow plate / swing bend and cause harm to operatives working in the area. Additionally, proximity sensors on the CIP set manways and vessel manways are often present to protect the operative, these should pause the CIP when the connection is broken.
Many other feedback routes on a CIP set exist such as low‐level and high‐level sensors on tanks; these sensors are generally used to control flow routing within the CIP set or pause the set if solutions are low. However, we should also be testing this as a failed high‐level probe could overflow the caustic tank causing a risk to operatives.
For further information on CIP please contact your local Holchem Technical Sales Consultant.