Strength analysis for cooling pipe of a certain type gas turbine
                                      FANG Zhi yang1, WEI Jia ming2, ZHU Zi qi2, SUN Yi gang1, LAN Ji bing2, FANG Yin1
（1.Hangzhou Steam Turbine Co.Ltd., Hangzhou 310006, China;2.Hangzhou Steam Turbine Power Co.Ltd., Hangzhou 310006, China）

Abstract: Aiming at the structure and strength failure problems of gas turbine cooling pipe under the condition of high temperature and pressure， the stress calculation and strength check were carried out on a certain type of E class gas turbine cooling pipe. The Pipe， Combin14 and Beam188 elements were used to simulate the properties of pipes， springs， support and hangers respectively in the FEM software. Meanwhile， the structure of support and hanger were simplified reasonably. Secondly， the reasonable boundary condition was applied to the cooling pipe to simulate the working environment under the condition of installation and operation. Finally， the primary stress and sec ondary stress check were carried out for cooling pipe. The results indicate that the cooling pipe is safe， and the design is reasonable. The proposed method is universal for same class gas turbine cooling pipe.

Key words: gas turbine; cooling pipe; strength check; primary stress; sec ondary stress