What is a CIP System?

CIP cleaning system is an ideal method for cleaning equipment and pipes, which is being used more and more widely in food processing enterprises, especially in dairy enterprises. In food processing enterprises, cleaning the processing equipment and pipes in product production is essential. Processing equipment and pipelines will produce some deposits after use; if not timely and thoroughly cleaned will directly affect the quality of the product. CIP In Place Cleaning (Cleaning In Place) equipment (tank. Pipes. Pumps, etc.) and the entire production line are cleaned in a closed loop without manual disassembly or opening. Disinfection. Cleaning In Place is called CIP, or Cleaning In Place or Automatic Cleaning.

cip system

CIP System Basic Information

The chemical energy is mainly generated by the chemical reagents added to it, which is the most critical factor in determining the washing effect. General manufacturers can choose detergents according to the nature and degree of pollution of the cleaning object, composition material, water quality, the selected cleaning method, cost, and safety. Commonly used detergents are acid, alkali detergent, and sterilization detergent.

The advantages of acid and alkali detergents are that: they can kill all microorganisms; remove organic matter better. Disadvantages include intense irritation to the skin; poor washability.

The advantages of a sterilizing agent are: sterilization effect is rapid, practical for all microorganisms; dilution is generally non-toxic; not affected by water hardness; in the equipment, the surface to form a film; concentration is easy to determine; easy to measure; can remove foul odor. Disadvantages are a unique smell; requires certain storage conditions; different concentrations of sterilization effect are very different; low temperatures are easy to freeze; improper use will produce side effects; mixed with dirt sterilization effect is significantly reduced; spilled easily stained environment and leaves traces.

Acid and alkali detergents in the acid refer to 1%-2% nitric acid solution, and alkali refers to 1%-3% sodium hydroxide at 65 ℃ -80 ℃ use—sterilizing agent for the often used chlorine bactericides, such as sodium hypochlorite, etc.

Thermal energy in a specific flow rate, the higher the temperature, the smaller the viscosity coefficient, and the greater the Reynolds number (Re). The temperature rise can usually change the physical state of dirt, and accelerate the speed of chemical reactions while increasing the solubility of land, to facilitate the cleaning of impurities solution, thereby improving the cleaning effect and shortening the cleaning time.

Re. measures the size of the movement energy, the general standard of Re: thin liquid flowing down from the wall, tank type Re> 200, tube type Re> 3000, and Re> 30,000, the best effect.

The solubility of water water is a polar compound, almost no solubility of greasy dirt, carbohydrates, proteins, or low fatty acids has a specific solubility, and the dissolution of electrolytes and organic or inorganic salts is more substantial.

Mechanical action by the action of movements, such as agitation, spray cleaning fluid generated by pressure, and friction.

CIP system affects cleaning factors

Equipment pollution degree, the nature of pollutants and product production process, etc. It is an important reason to determine the cleaning effect; if the cleaning is not based on its characteristics to assess the conditions of CIP, it is difficult to achieve the desired purpose and leads to high cleaning costs and other defects.

Types of detergents Currently, many kinds of detergents are used in the food industry, mainly acid and alkali, etc., of which sodium hydroxide and nitric acid are the most widely used. Alkali detergents have a good removal effect on dirt containing high protein but have a specific corrosive impact on food, rubber gaskets, and so on. Acid detergents tremendously impact stubborn dirt that alkaline detergents can not remove. Still, if there is a certain degree of corrosion on the metal, some anti-corrosion agents should be added or rinsed clean with water. Detergents also have surfactants, chelating agents, etc., but only when special needs are used, such as using chelating agents to remove metal ions when the hardness of the cleaning water is high.

When the concentration of the cleaning agent is increased, it can shorten the cleaning time or compensate for the lack of cleaning temperature. The increase in cleaning agent concentration will cause an increase in cleaning cost, and the rise in concentration is not necessarily effective in improving the cleaning effect, so manufacturers must determine the appropriate concentration according to the actual situation.

Washing liquid temperature, Generally speaking, for every 10℃ increase in temperature, the chemical reaction speed will increase 1.5-2.0 times, the cleaning speed will increase accordingly, and the cleaning effect is better. The cleaning temperature is generally not less than 60℃.

Cleaning time is affected by many factors, such as cleaning agent type, concentration, washing temperature, product characteristics, production pipeline layout, equipment design, etc. Cleaning time must be appropriate; too short can not effectively remove dirt, and too long is a waste of resources.

Take the beverage industry as an example; its cleaning procedure is as follows:

1. washing 3-5 minutes, hot water at room temperature or above 60℃; alkali washing 10-20 minutes, 1%-2% solution, 60℃-80℃; intermediate washing 5-10 minutes, clear water below 60℃; final washing 3-5 minutes, clear water.

2. washing 3-5 minutes, room temperature or hot water above 60℃; alkali washing 5-10 minutes, 1%-2% solution, 60℃-80℃, intermediate washing 5-10 minutes, clear water below 60℃, sterilization 10-20 minutes, hot water above 90℃.

Washing flow to ensure the flow rate is actually to ensure that the cleaning fluid flow rate when cleaning, to produce a specific mechanical effect, that is, by improving the turbulence of the fluid to improve the impact and obtain a particular product of cleaning.

CIP cleaning system operating procedures

1 、Objective is To standardize CIP cleaning operation procedures and maintain equipment to ensure continuous and regular production.

2 、Applicable scope

CIP cleaning section.


3.1 Cleaning order: 40 ℃ clear water, 2% alkali, 40 ℃ clear water, 0.8% acid, hot water above 90 ℃, cleaning in turn.

3.2 Clean and record according to the specified time.

3.3 Add water about 80%, that is, cover the heating coil can be.

3.4 Acid and alkali concentration :

3.4.1 Detect the concentration before cleaning; not enough to add the appropriate amount.

3.4.2 According to the degree of acid and alkali pollution, decide whether to reformulate.

3.5 Correctly connect the inlet and outlet dispenser.

3.6 Check the water distributor from time to time to prevent blockage.

3.7 Check that the pipeline and valve are correct before starting the centrifugal pump for cleaning.

3.8 When cleaning with acid and alkali, after cleaning, open the reflux pump so that acid and alkali flow into the acid tank and alkali tank, respectively.

3.9 Finally, rinse with water, and cleaning is complete.

3.10 Test with test paper is neutral.