Service Life Extension of Early Age Steel Bridges by Reducing Dead Weight

2021 ◽  
pp. 856-861
Author(s):  
Philippe Van Bogaert
Keyword(s):  
Service Life ◽  
Steel Bridges ◽  
Life Extension ◽  
Early Age ◽  
Dead Weight ◽  
Service Life Extension

Initial Implementation of IHI Zone Logic Technology at Philadelphia Naval Shipyard

1989 ◽  
Vol 5 (02) ◽  
pp. 79-89
Author(s):  
Koichi Baba ◽  
Takao Wada ◽  
Soichi Kondo ◽  
M. S. O'Hare ◽  
James C. Schaff
Keyword(s):  
Service Life ◽  
Life Extension ◽  
Initial Application ◽  
Initial Implementation ◽  
Late Fall ◽  
The Future ◽  
Service Life Extension ◽  
Extension Program ◽  
Technical Services

Philadelphia Naval Shipyard's application of zone logic to ship overhaul is neither small nor isolated. PNSY started its implementation of zone logic in the late fall of 1986, targeting the Service Life Extension Program (SLEP) for USS Kitty Hawk (CV-63) as the initial application. The technical services of Ishikawajima-Harima Heavy Industries Co., Ltd. (IHI), Japan were contracted to assist in this transition. This implementation on the Kitty Hawk is not a trial effort but involves about one third of the production man-days and covers over one half of the compartments on the ship. The actual SLEP production work on Kitty Hawk began in January 1988. Even though it is early in the three-year SLEP, zone logic already is proving its worth. This paper explains the zone logic methods and methodology applied at PNSY on Kitty Hawk. It also discusses the future of zone logic at PNSY and its continued application.

scholarly journals Sensitivity of Service Life Extension and CO2 Emission due to Repairs by Silane Treatment Applied on Concrete Structures under Time-Dependent Chloride Attack

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Aruz Petcherdchoo
Keyword(s):  
Service Life ◽  
Concrete Structures ◽  
Treatment Strategies ◽  
Time Dependent ◽  
Life Extension ◽  
Silane Treatment ◽  
Application Time ◽  
Free Service ◽  
Chloride Attack ◽  
Service Life Extension

This paper presents sensitivity of service life extension and CO2 emission due to silane (alkyltriethoxysilane) treatment on concrete structures under time-dependent chloride attack. The service life is predicted by the Crank–Nicolson-based finite difference approach for avoiding the complexity in solving Fick’s second law. The complexity occurs due to time-dependent chloride attack and nonconstant diffusion coefficient of concrete with silane treatment. At the application time of silane treatment, the cumulative CO2 emission is assessed. The effectiveness of silane treatment is defined as the ratio of the service life extension to the cumulative CO2 emission assessed within the corrosion-free service life. The service life extension is defined as the difference between corrosion-free service life of concrete structures without and with time-based application of silane treatment. From the study, the diffusion of chlorides in concrete with silane treatment is found to be retarded. In comparison, the strategy without deterioration of silanes during effective duration is more suitable for service life extension but less effective than that with deterioration. In the sensitivity analysis, there are up to eight parameters to be determined. The service life of concrete structures without silane treatment is most sensitive to the water-to-cement ratio and the threshold depth of concrete structures. Considering only five parameters in silane treatment strategies, the service life is most sensitive to the first application time of silane treatment. The cumulative CO2 emission is most sensitive to either the first application time of silane treatment or the amount of CO2 emission per application.

Service Life Extension and CO2 Emission due to Silane Treatment on Chloride-Exposed Concrete Structures

2017 ◽  
Vol 728 ◽  
pp. 384-389
Author(s):  
Aruz Petcherdchoo ◽  
Chotima Ongsopapong
Keyword(s):  
Service Life ◽  
Concrete Structures ◽  
Treatment Strategies ◽  
Life Extension ◽  
Chloride Diffusion ◽  
Silane Treatment ◽  
Free Service ◽  
Before And After ◽  
Chloride Attack ◽  
Service Life Extension

This study presents assessment of the environmental impact in terms of the CO2 due to silane treatment for extending corrosion-free service life of concrete structures under chloride attack. To achieve this, there are two issues to be addressed; prediction of corrosion-free service life extension, and assessment of the amount of CO2 emission. In predicting the corrosion-free service life extension, the behaviors of chloride diffusion before and after time-based silane treatment are considered. Then, the cumulative CO2 due to silane treatment is accordingly calculated. The ratio of the corrosion-free service life extension to the cumulative CO2 is defined as the effectiveness of silane treatment, and used to compare different silane treatment strategies.

Service life extension for rock cutters by increasing wear resistance of holders by thermomechanical treatment

2019 ◽  
pp. 67-71 ◽  
Author(s):  
V. I. Bolobov ◽  
◽  
S. A. Chupin ◽  
V. S. Bochkov ◽  
I. I. Mishin ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Service Life ◽  
Thermomechanical Treatment ◽  
Life Extension ◽  
Service Life Extension

POINTWORK SERVICE LIFE EXTENSION BY MEANS OF UNEVEN STIFFNESS OF TURNOUT CURVE RAILS LINE

2017 ◽  
pp. 7-14
Author(s):  
Ludmila Blazhko ◽  
Vladislav Zakharov ◽  
Yevgeniy Chernyayev ◽  
Yevgeniy Shekhtman
Keyword(s):  
Service Life ◽  
Computational Methods ◽  
Practical Importance ◽  
Side Impact ◽  
Life Extension ◽  
Rolling Stock ◽  
Study Results ◽  
Service Life Extension ◽  
Train Speed ◽  
Side Track

Objective: To reduce side wear of rail elements of side track backing-up rail. Methods: Comparative and computational methods were applied in the study. Results: It was detected that in order to extend the pointwork turnout curve service life, it is necessary to reduce the side impact on an outer rail by using rail pads of diverse elasticity. Practical importance: Application of rail pads of diverse elasticity under the outer and inner rails of a pointwork turnout curve makes it possible to increase the speed of rolling stock movement on the side direction of pointwork and increase the life of a pointwork turnout curve with fixed train speed.

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