Serviceability Assessment for Safe Operation of Hydroprocessing Reactor by FFS (HPIS Z101-2 Level 2 Assessment)

摘要

The Japan Steel Works, Ltd. (JSW) developed the Fitness-For-Service (FFS) assessment procedure of 21/4Cr-lMo steel heavy wall hydroprocessing reactors derived by the material properties of hydrogen embrittlement cracking of old generation 21/4Cr-lMo steel (60's steel), where the combining effect of temper embrittlement and hydrogen embrittlement defined by threshold fracture toughness value for a hydrogen environment, Km and material fracture toughness measured in the hydrogen charging environment, Kic-h , and the in-service crack growth represented by hydrogen assisted cracking rate model, da/dt and/or dc/dt were provided based on JSW studies. This procedure evaluates the present integrity given a current state of damage and the projected remaining life of reactor by the applicable FFS Codes.