Christmas tree design
This article describes the preferred approach to various aspects of Christmas tree design, with regard to pressures, types of well, equipment, experience, operability and safety. All wellhead valves and components should comply with the current edition of API Specification 6A.
Definition of a christmas tree
A Christmas tree is the cross-over between the wellhead casing and the flowline to the production process. It is defined as all the equipment from and including the wellhead connection through to and including the downstream flange of the choke.
A Christmas tree controls the wellhead . . .