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pro vyhledávání: '"Marvin J. Cohn"'
Autor:
Marvin J. Cohn
Publikováno v:
Volume 4A: Materials and Fabrication.
The American Society of Mechanical Engineers (ASME) Power Piping Code B31.1 discusses operation and maintenance piping system program requirements in Chapter VII. These program requirements for covered piping systems (CPS) operating in the creep rang
Publikováno v:
Volume 4: Materials and Fabrication.
This paper discusses high energy piping (HEP) system walkdown requirements and guidelines in compliance with the American Society of Mechanical Engineers (ASME) B31.1 Code. Chapter VII states that the Operating Company shall develop and implement a p
Publikováno v:
Volume 4: Materials and Fabrication.
Advanced techniques of evaluating cumulative material damage for power plant components operating in the creep range can enhance life management strategies, especially as power plants transition to more flexible operations. Power piping creep damage
Autor:
Marvin J. Cohn, Fatma G. Faham
Publikováno v:
Volume 6A: Materials and Fabrication.
Stress analysis evaluations of high energy piping systems operating in the creep range have revealed that each piping system has a large range of ASME B31.1 Code stresses. It is typical that there are only a few locations of high stresses and many mo
Autor:
Charles Henley, Marvin J. Cohn, Steve R. Paterson, Michael Johnson, Erick Liebl, Keith Rapkin
Publikováno v:
Volume 6A: Materials and Fabrication.
After a power piping system has begun commercial operation, it is recommended that the initial nondestructive examination (NDE) of the welds should be developed and executed to reveal possible fabrication and early service-related material damage. Th
Autor:
Marvin J. Cohn, Ron Haupt
Publikováno v:
Volume 6A: Materials and Fabrication.
The ASME B31.1-2018 Power Piping Code (Code) paras. 102.2.4, 102.3.3, and 104.8.2 provide an allowance regarding operating above the design temperature and design pressure for short time periods. The concept of allowing occasional operation for short
Publikováno v:
ASME 2018 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries.
A fitness-for-service (FFS) evaluation was performed on a cogeneration power plant high pressure steam line. The piping system included a Gr 91 to Gr 22 dissimilar metal weld (DMW) between an SA-335 Gr P91 pipe and an SA-335 Gr P22 reducer. This unit
Publikováno v:
ASME 2018 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries.
Uncertainty in modeling the creep rupture life of a full-scale component using experimental data at microscopic (Level 1), specimen (Level 2), and full-size (Level 3) scales, is addressed by applying statistical theory of prediction intervals, and th
Autor:
Marvin J. Cohn
Publikováno v:
Volume 6B: Materials and Fabrication.
The basic power piping creep life calculations consider the important variables of time, temperature and stress for the creep rupture properties of the unique material. Some engineering evaluations of remaining life estimate the applied stress as the
Autor:
Marvin J. Cohn
Publikováno v:
Volume 6B: Materials and Fabrication.
This paper discusses a fitness-for-service (FFS) evaluation of a hot reheat (HRH) piping system with about 400,000 hours of operation. It discusses significant differences between the as-designed and simulation as-found piping stress analyses. The si