De kan opdeles på to store kategorier, nemlig dels rør til transport af olie og gas over korte eller længere strækninger (»LP«), dels borerør, der i almindelighed benævnes OCTG-rør (»Oil Country Tubular Goods«).
They include two major categories, i.e. project line pipes for carrying oil and gas over medium and short distances (LP) on the one hand and borehole pipes and tubes, commonly called oil country tubular goods (OCTG pipes and tubes) on the other hand.