FEM structure on the basis of the actual construction conditions for compliance improvements

Floating Production Storage and Offloading Tanker (FPSO) is a tanker offshore structure shape , compared with ordinary oil tankers , FPSO will withstand more severe loading conditions , and thus its hull structure should have a special durability and fatigue fracture strength to ensure that the location of the job continue to work  Valve manifold  to the production requirements of more than 40 years until the end of oil exploration . According to the survey of damaged FPSO injury , openings and through the horizontal longitudinal frame at the connection node and other structures are prone to fatigue damage of the site, it is necessary in the finite element numerical calculation based on the structural form of realistic 2 way manifolds of the construction conditions . FPSO tanker loading and unloading more frequently than , so loading and unloading on the hull caused by the low- cycle fatigue damage can not be ignored . Due to structural nodes in the design or production of an  Instrument valve manifolds  , supervision and management and other aspects of vulnerability , or encountered a typhoon and other adverse sea conditions , the FPSO hull structure will crack. Crack initiation at the weld toe early stages of sanding through the crack repair methods , you can achieve the purpose of extending the fatigue life of the structure . Current international and domestic fatigue strength for FPSO research work focused on how to prevent cracks on the structure for cracks after studies conducted are less.