Unit 19 Process Gases Flashcards
What is the purpose of using air?
To drive pneumatic equipment. Method of use is pipework direct to plant.
What is the purpose of using Nitrogen?
To replace air in tanks and packages creating an inert atmosphere
De gassing product that has a high level of dissolved oxygen or carbon dioxide.
What is the method of use for Nitrogen?
By injection N2 into the product, usually during the packaging process.
By pressuring the package with N”
Flooding tanks and packages with N2
Purging from the base or outlet of a tank
What is the purpose of using carbon dioxide?
To give product it’s fizzy character
To replace air in tanks and packages creating an inert atmosphere
To act as an oxygen scavenge in de aeration
De gassing product
What is the method of use?
Injection into product
Flooding tanks and packages with CO2
Purging from the base or outlet of a tank
What is the quality parameter for air for pneumatic plant?
Dry & clean
Reason - operation of equipment
What is the quality parameter of Nitrogen and the reason?
Purity, especially absence of oxygen
Sterility
Freedom from contaminants eg oil or grease.
Reason - Even a small amount of oxygen may cause staling and product instability
Product will be come infected
Contamination
What is the quality parameter for carbon dioxide and the reason?
Purity, especially in absence of oxygen
Sterility
Freedom from contaminations
Reason - even a small amount of oxygen will cause flavour staling and product instability.
Product will become infected
Contamination
What are the features of CO2 to be considered?
It is a toxic gas at a high concentrations in the atmosphere (5% of CO2 is dangerous)
It is heavier than air and it will accumulate in low lying areas
It is generated in very large quantities during fermentation
How can the risks of CO2 be reduced?
Effective removal of the gas and from FV rooms using extraction systems
CO2 collection from fermentations
The installation of gas detectors. Alarms indicate levels above 0.5%
Safety measures that includes permits to work, permits to enter confined spaces ad evacuation procedures.
Why is nitrogen potentially dangerous?
because it will suffocate and is also difficult to detect. (air is 80% N2).
Dangers can be reduced by the installation of gas detectors.
What do the procedures cover to minimise risks for gas cylinders?
labelling
Handling
storage
Transporting
Use of personal protective equipment
