Installing the threaded mating flange A threaded mating flange is installed on the threaded casing. This particular flange was a prototype.
Current versions are simpler.
Mating the casing to the well head enclosures was done at Lajitas with a custom threaded flange. Sealer added ready for enclosure. A padlock and chain hang on the left side of the casing. This was used to secure the cover while the cement was curing. This particular site was close to a well traveled highway.