Ord og uttrykk - Ptil
https://www.ptil.no/fagstoff/ord-og-uttrykkEngelsk. Steel support structure placed on the seabed – or on a production facility – as a foundation for casing, wellheads, Xmas trees, manifolds, chokes and so forth in/on subsea wells. Has a superstructure to protect against possible trawling and dropped objects. Can support one or more wells (slots).