This is the 9584th most frequent Swedish word.
förlängda
Extended; prolonged.
'Förlängda' is used here to describe something that has been made longer in duration, in this case, the vacation.
Den förlängda semestern gav oss extra tid att vila.
The extended vacation gave us extra time to rest.
Here, 'förlängda' refers to an extension of a duty or obligation period, specifically his service abroad.
Hans förlängda tjänstgöring i utlandet var en möjlighet för honom att lära sig nya saker.
His extended service abroad was an opportunity for him to learn new things.
In this context, 'förlängda' describes a physical extension or prolongation of a part of the system, represented by the pipes.