Your efficiencies for each system will be different. If you know the equipment profile specifications for the 7bbl system, that will be a great start. E.g. evaporation rate for a ‘brewery sized’ boil kettle will be ~3-5% rather than a ~15% evaporation rate for homebrew systems. If you scale up the recipe and your equipment profiles are established for the 7bbl system, you can then compare your 12 gallon recipe to the 7 bbl scaled up recipe and notice that Ibu and hop utilization does not scale equally. Adjust those accordingly. Malt does scale up with the percentages and amount in the malt bill, but you will have to adjust your total amount since the system efficiencies are different, and since evaporation rate is less for brewery sized boil kettles, you will need less volume for preboil, which effects hop utilization and total water needed for the scaled up brew. If you do have your equipment profile established for the 7bbl system, then simply compare your numbers (hop utililzation and Ibus/ malt bill needs) for each recipe based on that equipment profile and adjust accordingly. Keep in mind other variables, such as that the strike temp will change as you are using a different mash tun with different thermal properties.
Typically, breweries pitch yeast at a much higher rate to avoid off flavors and to fight against any sort of possible infection, so a larger yeast pitch proportionally is advised. Scaling of water is strait forward if it is the same water source; if not, it will be difficult to replicate without testing the water sources.
Chilling method should be taken into consideration as well. If you use an immersion chiller for the 12 gallon batches and a plate chiller for the 7 bbl system, your recipes, especially for heavily hopped IPAs will be different. If you do use a plate chiller for the 12 gallon batches, compare knock out times though your chilling unit and adjust hop additions accordingly.
There are so many variables in scaling up homebrew recipes to a brewery size. I hope this is a good start in helping you to do so. I am happy to help you work through this more if you like.
Cheers!
Nick Kauffman
Brewer/ Sales