These are the guys hooking up valves, fixing pipes, monitoring how chemicals are loaded from the trucks into the plant systems... doesn't much matter that's flowing through the pipes- the workers can read the data sheets and procedures and work on anything.
Again, these are blue collar jobs. High school education at best. Mostly a manual labor job. They're not designing the plant, just operating and repairing it according to plans designed by someone else.
EDIT: Here's a list of chemicals used in meat processing: https://www.osha.gov/meatpacking/hazards-solutions. Ammonia for refrigeration. Chlorine, hydrogen peroxide and peracetic acid for disinfectant. The chemicals are delivered to the plant in concentrated forms and diluted for use.
Again, these are blue collar jobs. High school education at best. Mostly a manual labor job. They're not designing the plant, just operating and repairing it according to plans designed by someone else.
EDIT: Here's a list of chemicals used in meat processing: https://www.osha.gov/meatpacking/hazards-solutions. Ammonia for refrigeration. Chlorine, hydrogen peroxide and peracetic acid for disinfectant. The chemicals are delivered to the plant in concentrated forms and diluted for use.