Hi, while you can visit the brewery, do not expect to see the pipeline while walking in Bruges. It is buried under ground.
Well, I now have to apologise, as I went back to the brewery last week-end, and indeed you can see 2 tubes of the pipeline at the entrance of the courtyard. They are under a glass window under the entry porch at Walplein 26, 8000 Brugge.
Ah! Thank you for the update!