Horizontal tree 2 : A subsea production tree with a horizontal valve arrangement to the side of the tubing hanger, permitting direct access to the tubing and tubing hanger without having to remove the tree during a workover
George E. King Engineering, 5000 Oilfield Terms: A Glossary of Petroleum Engineering Terms, Abbreviations and Acronyms, US 2010. http://gekengineering.com/Downloads/Free_Downloads /Glossary_of_Petroleum_Engineering_Terms_25_August _2010.pdf, (Oil - Amer) {593}