The National Shipbuilding Research Program 1985 Ship Production Symposium Volume 2 Paper No. 16: Computer Optimizing of Bevel Angles for Welded Pipe Joints
The National Shipbuilding Research Program 1985 Ship Production Symposium Volume 2 Paper No. 16: Computer Optimizing of Bevel Angles for Welded Pipe Joints

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Published: 1985

Total Pages: 23

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The most common method for preparing the bevel-angle for welded pipe construction is to keep it at a constant value (say 37 degrees) around the entire periphery of the branch pipe. This paper explores the "optimized bevel-angle" as a function of pipe radii, wall thicknesses, centerline offset, and intersecting angle to keep the resulting weld cross section constant and thus minimize the weld volume while insuring clearance for total weld penetration. The advantages of using the "optimized bevel angle" are demonstrated by computer simulation for pipe diameters from 4-1/2" to 24" for wall thicknesses over the range of O.237" to 1.312". The ratio of the fixed bevel weld volume to the optimized bevel weld volume are shown to range from 1.5 to 5 which implies phenomenal reductions in the attendant welding time.

The National Shipbuilding Research Program. Proceedings of the IREAPS Technical Symposium. Paper No. 16: Computervision Interface to Batch Electric Boat Piping Programs
The National Shipbuilding Research Program. Proceedings of the IREAPS Technical Symposium. Paper No. 16: Computervision Interface to Batch Electric Boat Piping Programs

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Published: 1982

Total Pages: 22

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The computerized programs for piping system evolution: 1. provided pipe bending data for length, bend angles, roll engles and distance between bends, 2. added fitting, valve, and hanger locations to both bent and straight pipe by match marking and creating pipe details, 3. combined details into assemblies, 4. generated isometric and orthographic drawings, 5. added welding identification and data, 6. extracted and added material information, 7. expanded to include work authorizations, trade work instructions, feed relationships, test boundaries, and serialization, and 8. generated tapes for data transfer to work authorization files and reports for manufacturing and installation.

The National Shipbuilding Research Program, 1990 Ship Production Symposium, Paper No. 5B-2: Shipboard Aluminum/Steel Welded Transition Joints Evaluation and Improvements
The National Shipbuilding Research Program, 1990 Ship Production Symposium, Paper No. 5B-2: Shipboard Aluminum/Steel Welded Transition Joints Evaluation and Improvements

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Published: 1990

Total Pages: 22

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Aluminum to steel explosion welded transition joints are used to attach aluminum superstructures to steel hulls. Transition joint bond separation sometimes occurs during ship construction. Ingalls Shipbuilding conducted a long term study to determine causes and corrective action for these separations. The aluminum/steel transition joints are manufactured by the explosion bonding process and tested in accordance with MIL-J-24445. Traditional transition joints consist of alloyed aluminum bonded to mild steel with an interlayer of low alloy aluminum. The study reviewed transition joint manufacture and quality testing required by the material specification, reviewed the adequacy of design guidelines and production practices, and considered cost effective methods for corrective action. Modifications in product design and testing, installation design and shipyard production practices can improve reliability. The most important result of this study was development of material with improved Properties. This paper relates the study procedure, findings and recommendations so that transition joint separations can be avoided on future installations. This information is useful for designers and transition joint users.

Ship Production
Ship Production

Author: Richard Lee Storch

Publisher: Cornell Maritime Press/Tidewater Publishers

Published: 1995

Total Pages: 0

ISBN-13: 9780870334610

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Revised and updated (1st ed., 1988) to reflect current information and practice in the shipbuilding industry, this text/reference describes the principles and practice of ship production employing group technology. The system described is a mix of old and new techniques, aimed at optimizing producti

The National Shipbuilding Research Program. 1997 Ship Production Symposium, Paper Number 11: Design, Fabrication, Installation, and Operation of Titanium Seawater Piping Systems
The National Shipbuilding Research Program. 1997 Ship Production Symposium, Paper Number 11: Design, Fabrication, Installation, and Operation of Titanium Seawater Piping Systems

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Published: 1997

Total Pages: 21

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For many years, the U.S. Navy fleet has experienced severe corrosion and erosion problems in copper nickel seawater piping systems. Since titanium is extremely resistant to corrosion and erosion, it has been viewed as a potential solution to these problems. However, certain concerns regarding shipboard use of titanium needed to be addressed: marine fouling, galvanic action with other metals, welding, system fabrication in a normal shipyard environment, testing, and life cycle costs. Over a three year period, Ingalls Shipbuilding division of Litton Industries and the Naval Surface Warfare Center, White Oak, worked with various commercial equipment suppliers to address these concerns. Partially because of the success of this project, it was decided to retrofit titanium systems aboard TARAWA Class LHAs and to specify same for the new LPD 17 Class ships.

The National Shipbuilding Research Program, 1992 Ship Production Symposium Proceedings, Paper No. 2B-2: The Effective Use of CAD in Shipyards
The National Shipbuilding Research Program, 1992 Ship Production Symposium Proceedings, Paper No. 2B-2: The Effective Use of CAD in Shipyards

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Published: 1992

Total Pages: 15

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In the current severely competitive climate that is challenging shipbuilders everywhere, how information is managed is taking on extraordinary importance. Existing computer aided design (CAD) systems have not been focused on the most critical information needs, for example, information to serve marketing. This limitation is the result of concentrating primarily on aspects of design and manufacturing without regard for impact on an overall manufacturing system. In this paper the need to extend CAD systems is identified so that they would more fully provide critical-data to everyone who has to have understanding of a manufacturing system's capability and availability.

A Planning Guide - New Technologies in Pipe Joint Fabrication (The National Shipbuilding Research Program).
A Planning Guide - New Technologies in Pipe Joint Fabrication (The National Shipbuilding Research Program).

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Published: 1987

Total Pages: 17

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In the past few years. methods of joining pipe together have been introduced to supplement and. in some cases replace, both the traditional welded and the brazed pipe fitting. It is necessary to examine what is available. and to justify its place and application in the marine market. This paper intends to examine the Swage Marine Fitting (SMF) and the Heat Recoverable Coupling (HRC) and, briefly. the Compression and the bite type fit- tings. we will look at them from economic, performance, and environment all standpoints. In the case of the SMF and HRC fittings, technical papers on the usage of each fitting and its constraints have been presented. The purpose of this paper is to evaluate them together and incorporate them into an overall piping system. In addition. the two primary guides for piping on military ships will be examined. These will be used to place the SMF and HRC into correct perspective, and to make recommendations for further applications. Comments will also be offered on the testing method and the results gained. Graphs are provided to illustrate the economic advantage of the SMF application.

Materials, Design, and Manufacturing for Sustainable Environment
Materials, Design, and Manufacturing for Sustainable Environment

Author: Santhakumar Mohan

Publisher: Springer Nature

Published: 2021-02-06

Total Pages: 909

ISBN-13: 9811598096

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This book comprises the select proceedings of the International Conference on Materials, Design and Manufacturing for Sustainable Environment (ICMDMSE 2020). The primary focus is on emerging materials and cutting-edge manufacturing technologies for sustainable environment. The book covers a wide range of topics such as advanced materials, vibration, tribology, finite element method (FEM), heat transfer, fluid mechanics, energy engineering, additive manufacturing, robotics and automation, automobile engineering, industry 4.0, MEMS and nanotechnology, optimization techniques, condition monitoring, and new paradigms in technology management. Contents of this book will be useful to students, researchers, and practitioners alike.