念のためググったらこんなのが出てきた:
http://www.mehrnews.ir/en/NewsDetail.aspx?NewsID=205809

文中にあるのが:
The part of the pipeline passing via Armenia is 42 km long
with a diameter of 28 inches. It transfers gas from the border
point with Iran to Karajan.
The received gas in Karajan is injected to internal gas distribution
network in Armenia, he stated.