Role of physical and mechanical properties of stainless steels in expected thermal fatigue life of plenum barrier plate of a gas turbine frame

摘要

Descriptions of the open cycle gas turbine operation, the operational backgrounds and the failure problem in Putrajaya Power Station Malaysia were reported by Rashid et al. [1]. According to the report, the concerns were the repeating findings of several obvious surface-crack spots on the weld joint zone of a plenum barrier plate of the gas turbine frame. Shielded Metal Arc Welding (SMAW) method was reported to be used for the welding process in assembling the plenum barrier plate. The modified model of the barrier plate was then presented for redesign consideration. It was found from thermal fatigue analyses, the life expectancies of modified models for the barrier plate design could withstand the operational loading and has a significant longer life than that of the original model.