Design and Remnant Life Analysis of a Carbon Steel Containment Jacket Operating in the Creep Range

2004 ◽  
Author(s):  
David Mair
Keyword(s):  
Elevated Temperature ◽  
Carbon Steel ◽  
Creep Behaviour ◽  
Operating Life ◽  
Probabilistic Technique ◽  
History Of ◽  
Routine Inspection ◽  
Life Analysis ◽  
Steam System ◽  
Operating History

During routine inspection of a 35 year old steam generating plant, a large surface crack was found at a critical tee intersection. With the crack appearing to be close to a condition of sudden rupture, a probabilistic technique was used to assist in determining the likelihood of failure. This paper describes this technique and the design of a carbon steel containment jacket used to enclose the cracked area. The design of the jacket had to take into account its creep behaviour at elevated temperature. The advantage of this repair method was that it was able to be installed quickly and without having to completely de-pressure the steam system. It was later decided that the operating life of the jacket should be extended to defer a planned shutdown. A simplified remnant life analysis was then undertaken as detailed in this paper. Taking into account the operating history of the jacket, it demonstrated that the life of the jacket could be safely extended as required.

Taipower Tunghsiao Stag Combined Cycle Power Plant

1984 ◽  
Author(s):  
Leroy O. Tomlinson ◽  
David C. Timmerman
Keyword(s):  
Control Systems ◽  
Gas Turbines ◽  
Combined Cycle ◽  
Residual Oil ◽  
Steam Generation ◽  
Cycle Systems ◽  
Computer Based ◽  
Steam System ◽  
Operating History ◽  
Distinguishing Features

Units 1 and 2 in the Tiawan Electric Power Co. (Taipower) are General Electric STAG 307E combined cycle systems with rated output of 570 MW. These combined cycle generation systems include high technology gas turbines, an unfired steam system with steam generation at two pressures and computer based control systems. The net plant thermal efficiency at the rating point is 45.3% on distillate oil and 44.8% on residual oil. Currently one of the six gas turbines is operating on residual oil and five are operating on distillate. When the residual oil conversion is complete, these will be the World’s most efficient residual oil fired power generation units. A description of the distinguishing features, construction and early operating history are presented.

Fretting wear of the nitrided medium carbon steel under line contact condition at an elevated temperature

2019 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Guanghong Wang ◽  
Guangwei He ◽  
Shengguan Qu ◽  
Hao Li ◽  
Mushun Zhou ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Carbon Steel ◽  
Wear Debris ◽  
Medium Carbon Steel ◽  
Contact Condition ◽  
Fretting Wear ◽  
Wear Loss ◽  
Line Contact ◽  
Medium Carbon ◽  
Content Type

Purpose Fretting wear exists widely in the field of matching mechanical parts whereas previous research studies mostly focus on the point contact through a ball-plate tribometer. This paper aims to study the influence of wear debris on the fretting wear characteristics of the nitrided medium carbon steel under line contact condition at elevated temperature. Design/methodology/approach Fretting wear behavior of the nitrided medium carbon steel was experimentally investigated under line contact condition at elevated temperature and different normal loads without lubrication. Wear loss, worn surface and wear debris were studied to analyze the wear mechanism of nitrided steel. Findings The results showed that surface hardness of the medium carbon steel was notably improved because of the generation of a 230 µm nitrided case. Wear loss increased with the normal load, which was associated with the damage of a thin solid film formed by the wear debris, consisting of iron oxides and chromium oxide rather than only iron or iron oxides. The wear debris became partially amorphous and spherical because it was trapped within the contact interface and was ground, rolled, oxidized under line contact conditions. The spherical wear debris acted as a third body and formed a lubricating film between the contact faces. This lubricating film helped to stabilize the friction coefficient and reduced the wear rate, which further caused the acceleration of wear volume to gradually decrease. The wear mechanisms of the nitrided steel were oxidation wear, abrasive wear and fatigue spalling of the oxide layer. Originality/value The findings are helpful to understand the fretting wear behavior of the friction pair under line contact and enrich the fretting tribology theory.

Contributions of Dr. Sumio Yukawa in the Development of Non-Ductile Failure Prevention Rules in the ASME Code

2008 ◽  
Author(s):  
Hardayal S. Mehta
Keyword(s):  
Elevated Temperature ◽  
Carbon Steel ◽  
Stainless Steels ◽  
Pressure Vessel ◽  
Nickel Alloys ◽  
Ductile Failure ◽  
Austenitic Stainless Steels ◽  
Current Status ◽  
Asme Code

The objective of this paper is to review and highlight the contributions of Dr. Sumio Yukawa in the development of rules for the prevention of non-ductile failure in the ASME Boiler and Pressure Vessel Code. This includes review of his role in the development of WRC-175, Appendix G of Section III, the development of early flaw evaluation rules for carbon steel piping and in the review and evaluation of the toughness of austenitic stainless steels and nickel alloys after long-term elevated temperature exposures. The current status of these activities is briefly described.

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