Children really are the most wonderful, useful creatures! The unfortunates from the orphanage have proved indispensable in cleaning the larger steam pipes. It appears that matter from the slaughtering process may indeed vapourise at source, but drifts like dust through the air and lodges in the pipes, causing them to foul. Periodically, we shut the pressure down and send one of our pixies into the pipes to scrub the reconstituted fat away. Armed with just a shortened broom, our little explorers venture into the dark.
Of course, we can only keep pressure down for a short period, so they must be fast, or they risk being trapped and boiled by the superheated vapours when they rush back into the system. Then we will be sending their comrades in afterwards to scrape free the cooling mess. The survivors tell me you can reach all manner of places within the complex through the pipes. I smile, tell them I am so proud. And then feed them to the pigs.))