Plant Cleaning

Question 1

Sinner’s Circle

Answer 1

Time, temperature, chemical, mechanical

Question 2

CIP Systems

Answer 2

Achieve better hygiene more efficiently and with less risk of injury to personnel.

Question 3

Fixed spray balls

Answer 3

Least expensive, high water usage. Low pressure/high volume cleaning.
Mechanical action is that of the water striking the soil and running down the sides of the vessel.

Question 4

Rotary spray heads

Answer 4

Rotating spray heads: High and low pressure.
-Low pressure: Usually cover the vessel’s interior immediately
-High pressure: Jets rotate slowly and work like a pressure washer

Question 5

Sodium Hydroxide (caustic)

Answer 5

-Detergent used to dissolve organic compounds (85% effectiveness)
-Reacts with CO2 in vessels to produce sodium carbonate and bicarbonates, which removes the cleaning chemical and occupies less space than CO2. (Best case: ineffective cleaning. Worst case: vessel implosion)

Question 6

Detergents acids (nitric or phosphoric acids)

Answer 6

Detergents used to dissolve inorganic compounds such as: soft scale, other metal salts of silicates, oxalates, phosphates. Completely consumed during cleaning; re-dosing may be necessary.

Question 7

Wetting agents (surfactants)

Answer 7

Agents which reduce the surface tension between cleaning solution and the soil, helping to break it up. Added to acid detergents to help remove scale, especially organic scale.

Question 8

Sequestering and chelating agents

Answer 8

Agents which can be added to acid or alkaline detergents to remove metal ions and hardness.
-Chelating: binds with a single metal ion
-Sequestering: binds with up to 1000

Question 9

Dispersing agents

Answer 9

Agents which help remove soil by preventing it from re-depositing on surfaces. Ready to be rinsed away.

Question 10

Chlorination

Answer 10

Chlorinated alkalis deal with very stubborn soil. Could corrode stainless; should be used in very low concentrations.

Question 11

Recovery CIP system

Answer 11

System which circulates and returns detergent solution to its original CIP tank. Conductivity meters measure the solution and doses chemicals as needed. Pre-rinse, primary detergent circulation, post detergent rinse (rinse water recovered), additional cycles.

Question 12

Single use CIP system

Answer 12

System which circulates and sends detergent and rinse water to drain. Can adjust chemical concentration and temperature for each vessel. Pre-rinse, detergent recirculation, post detergent rinse.