Vezi fig. 2.22 din acest document:
http://test.mrxl.ro/joomla/images/Cursuri/uem/Cap2_2.pdf

http://www.petal.ro/produse-sub-echipamente-id-12-lang-ro.ht...
Capetele de eruptie sunt ansamble de robinete si fitinguri destinate captarii si reglarii debitului amestecului de titei, apa si gaze la gura sondei in eruptie naturala, pentru presiuni de lucru de la 140 bar (2,000 PSI) pana la 700 bar (10,000 PSI) si au flansele dimensionate in conformitate cu API 6A.

http://en.wikipedia.org/wiki/Christmas_tree_(oil_well)
In petroleum and natural gas extraction, a Christmas tree, or "tree" (not "wellhead" as sometimes incorrectly referred to), is an assembly of valves, spools, and fittings used for an oil well, gas well, water injection well, water disposal well, gas injection well, condensate well and other types of wells. It was named for its crude resemblance to a decorated tree.

http://bd.osim.ro/pdf/116000-/116700-/116738.pdf

http://hallo.ro/search.do?l=ro&d=en&query=armatura navis

http://dictionare.4rev.net/?SearchBox=CHRISTMAS TREE&Diction...

http://www.ce-inseamna.ro/cuvântul/armatura capului de erupt...