Before revision: ASME API 579-1/ASME FFS-1-2021 Fitness-For-Service, December 2021 Here, Nomenclature L = rupture life (hours) = initial or reference creep strain rate at the start of the time period being evaluated based on stress state and temperature = Omega multiaxial damage parameter to = cure-fit coefficients for the Yield strength data, the MPC Project Omega creep strain rate parameter, or the Larson Miller Parameter = adjustment factor for creep ductility in the Project Omega Model; a range of +0.3 for brittle behavior and -0.3 for ductile behavior can be used = reference temperature = temperature = stress parameter = parameter based on the state-of-stress for MPC Project Omega Life Assessment Model = 3.0 - pressurized sphere or formed head.
After revision: Here, Nomenclature L = rupture life (hours) = initial or reference creep strain rate at the start of the time period being evaluated based on stress state and temperature = Omega multiaxial damage parameter to = cure-fit coefficients for the Yield strength data, the MPC Project Omega creep strain rate parameter, or the Larson Miller Parameter = adjustment factor for creep ductility in the Project Omega Model; a range of +0.3 for brittle behavior and -0.3 for ductile behavior can be used = reference temperature = temperature = stress parameter = parameter based on the state-of-stress for MPC Project Omega Life Assessment Model = 3.0 - pressurized sphere or formed head.