Up until the Fifties, sealed systems such as pipes or process equipment in technical process plant had to be dismantled and cleaned by hand. This was invariably a time-consuming process. Especially in industrial sectors such as pharmaceuticals, food and beverage, where frequent and regular cleaning was required, manual cleaning of a system consumed an enormous amount of time.
CIP – Clean-In-Place
These industrial sectors benefited greatly from the arrival of CIP processes. This is because a cleaning method had been created that is still in use today, one which enables the internal surfaces of sealed systems to be cleaned without the need for disassembly (or only to a limited extent). For the most part, the CIP process is an entirely automatic one, to comply with defined process times and parameters. The cleaning operation is performed in a series of defined steps, as this flow diagram illustrates. Depending on the application, cleaning temperatures may be as high as 90°C. A turbulent flow is also required, with flow rates usually between 1.5 and 2.1 m/s, to remove all impurities. Speeds above or below these limits generally fail to deliver a satisfactory cleaning result.
SIP – Sterilization-In-Place
The SIP process is an extended form of the CIP process, one that adds a sterilization step, and it is usually operated from the same installation. The sterilization of hygiene-critical processes takes place at the end of the actual CIP process. This ensures that any microorganisms still active in the system are killed off with hot water or with saturated pure steam at high temperatures (typically 140°C). The effectiveness of this can be further enhanced by the addition of chemical disinfectants. Of course, WIKA offers appropriate measurement technology for CIP and SIP for a comprehensive range of measurement parameters.