A Collaborative Approach to Achieving a Gas-Tight Seal Using Expanded Polytetrafluorethylene (ePTFE) Gaskets in a Fiberglass-Reinforced Plastic (FRP) Lap-Joint Flanges

2012 ◽  
Author(s):  
John Czerwinski ◽  
Vijay K. Garikipati ◽  
Charlene N. Jones ◽  
Brad Pires ◽  
John P. Ludman ◽  
...  
Keyword(s):  
Collaborative Approach ◽  
Lap Joint ◽  
Fugitive Emissions ◽  
Plant Operator ◽  
Chemical Process Industry ◽  
Reinforced Plastic ◽  
Piping Systems ◽  
Bolted Flange ◽  
Gas Tight

The work presented here is a collaborative approach to achieving a reliable gas tight seal in fiberglass reinforced plastic (FRP) flanged joints using expanded polytetrafluoroethylene (ePTFE) gaskets. There are many advantages to incorporating FRP flanged piping systems in today’s chemical process industry plant build. As regulations on reliability and fugitive emissions become stricter, it is more important than ever to eliminate possible damage and leak paths at the flanged connections in these systems. This paper details a case study on a collaboration between a chemical plant operator (end user), an ePTFE gasket manufacturer, and a FRP piping original equipment manufacturer. Over a twenty-four month period a FRP flanged system was designed and validated using a custom FRP stub and ring, also known as a lap joint, flange with an ePTFE gasket. The result was the development of a FRP bolted flange system that successfully achieved a reliable gas tight seal for aggressive chemicals. Beginning with a theoretical model and ending with experimental lab analyses, the conclusive results are included herein.

Revisiting UK Marine Protected Areas governance: A case study of a collaborative approach to managing an English MPA

2020 ◽  
Vol 30 (9) ◽  
pp. 1829-1835 ◽  
Author(s):  
Jean‐Luc Solandt ◽  
Stephen K. Pikesley ◽  
Colin Trundle ◽  
Matthew J. Witt
Keyword(s):  
Protected Areas ◽  
Marine Protected Areas ◽  
Collaborative Approach

Combining Optical Metrology and Additive Manufacturing for Efficient Manufacturing of Carbon Fiber Reinforced Plastic Orthopedics: A Case Study

2017 ◽  
Vol 871 ◽  
pp. 275-283
Author(s):  
Josefine Jahn ◽  
Benjamin Thorenz ◽  
Markus Kafara ◽  
Rolf Steinhilper
Keyword(s):  
Carbon Fiber ◽  
Optical Metrology ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Final Assembly ◽  
Reinforced Plastic ◽  
Master Pattern ◽  
Carbon Fiber Reinforced

Often, carbon fiber reinforced plastic (CFRP) manufacturing represents an expensive, time-consuming, small-scale production due to products and components characterized by complex geometric properties. In the field of orthopedic products individual molds, usually made of metal alloys or plaster, are necessary to shape the contour of the components. The presented case study focuses on individually manufactured masks for post-operative treatment of uncomplicated midfacial fractures that are frequent and typical injuries in popular contact sports like football or handball. To improve the costly process of CFRP production of individually manufactured masks, this paper describes the advantages of the combination of optical metrology (i.e. 3D-scanning) and additive manufacturing (i.e. 3D-printing). Therefore, the conventional process chain consisting of the main process steps molding (master pattern), casting (mold), CFRP laminating, curing, cutting and final assembly is replaced by 3D-scanning (instead of master pattern), followed by the revision of the CAD-model (to prevent cutting efforts), 3D-printing (mold), CFRP laminating, curing and final assembly. Summarizing, this case study on manufacturing of carbon fiber reinforced plastic orthopedics shows that the combination of innovative manufacturing technologies opens up new possibilities to increase efficiency in craft based manufacturing.

Main Issues on the Seismic Design of Industrial Piping Systems and Components

2013 ◽  
Author(s):  
Fabrizio Paolacci ◽  
Md. Shahin Reza ◽  
Oreste S. Bursi ◽  
Arnold M. Gresnigt ◽  
Anil Kumar
Keyword(s):  
Seismic Design ◽  
Seismic Analysis ◽  
Experimental Investigations ◽  
Piping System ◽  
Analysis And Design ◽  
Correct Definition ◽  
Component Design ◽  
Piping Systems ◽  
Current Design ◽  
Bolted Flange

A significant number of damages in piping systems and components during recent seismic events have been reported in literature which calls for a proper seismic design of these structures. Nevertheless, there exists an inadequacy of proper seismic analysis and design rules for a piping system and its components. Current seismic design Codes are found to be over conservative and some components, e.g., bolted flange joints, do not have guidelines for their seismic design. Along this line, this paper discusses about the main issues on the seismic analysis and design of industrial piping systems and components. Initially, seismic analysis and component design of refinery piping systems are described. A review of current design approaches suggested by European (EN13480:3) and American (ASME B31.3) Codes is performed through a Case Study on a piping system. Some limits of available Codes are identified and a number of critical aspects of the problem e.g., dynamic interaction between pipes and rack, correct definition of the response factor and strain versus stress approach, are illustrated. Finally, seismic performance of bolted flange joints based on the results of experimental investigations carried out by the University of Trento, Italy, will be discussed.

Method for Hazard Analysis of Chemical Process Equipment Taking Domino Effect into Account

2013 ◽  
Vol 321-324 ◽  
pp. 2456-2459
Author(s):  
Ming Liang Chen ◽  
Zhi Qiang Geng ◽  
Qun Xiong Zhu
Keyword(s):  
Chemical Process ◽  
Hazard Analysis ◽  
Process Industry ◽  
Process Equipment ◽  
Process Conditions ◽  
Domino Effect ◽  
Effect Analysis ◽  
Chemical Process Industry ◽  
Chemical Process Equipment

The hazard of chemical process equipment consists of two parts: the inherent hazard of process equipment and the hazard from domino effect among equipments. The inherent hazard of equipment depends on the properties of the substance present in the equipment and the specific process conditions. The domino effect is responsibility for many most destructive accidents in the chemical process industry. However, domino effect is either not considered at all or is done with much less rigour than is warranted. A method was proposed to evaluate the hazard of chemical process equipment. The inherent hazard and the hazard from domino effect were considered in the method. The procedure for the domino effect analysis among equipments was presented to evaluate the hazard from the domino effect. The method was implemented in a case study. The results show that it can be used to select the process equipment which should be intensive monitored.

The Carbon Fibre Structure for the Extreme Ultraviolet Imaging Spectrometer on the Solar-B Satellite

2005 ◽  
Vol 219 (3) ◽  
pp. 177-186
Author(s):  
C Castelli ◽  
R Hagood ◽  
H Mapson-Menard ◽  
B Winter
Keyword(s):  
Carbon Fibre ◽  
Extreme Ultraviolet ◽  
Thermal Design ◽  
Imaging Spectrometer ◽  
Charge Coupled Device ◽  
Performance Requirements ◽  
Reinforced Plastic ◽  
Final Design ◽  
Carbon Fibre Reinforced Plastic

The Extreme Ultraviolet Imaging Spectrometer (EIS) is a core instrument on the Japanese Solar-B mission and is due for launch in the summer of 2006. EIS is a 3.2 m long telescope employing grating optics and a pair of charge coupled device imaging cameras working in the extreme ultraviolet (EUV) region in two separate wavelength bands between 170-210 and 240-290 Å. To house all the telescope subsystems, a novel carbon fibre reinforced plastic structure was developed in collaboration with McLaren Composites Limited (UK) to meet a set of the demanding performance requirements in terms of dimensional stability, rigidity, and structural cleanliness as well as being able to survive the harsh launch environment of the Japanese M-V rocket. The final design was based on a honeycomb panel structure using stiff carbon fibre laminates. This case study describes some of the design challenges that were overcome for this project to produce the engineering, mechanical, and thermal models. Particular attention is given to the cleanliness control strategy to preserve the EUV optical throughput, the method of attachment to the spacecraft, and of optical subsystems as well as the instrument thermal design.

Performance-Based Analysis of Coupled Support Structures and Piping Systems Subject to Seismic Loading

2015 ◽  
Author(s):  
Oreste S. Bursi ◽  
Fabrizio Paolacci ◽  
Md Shahin Reza
Keyword(s):  
Seismic Design ◽  
Seismic Analysis ◽  
Design Method ◽  
Design Guidelines ◽  
Piping System ◽  
Support Structures ◽  
Limit States ◽  
Piping Systems ◽  
Allowable Stress Design

The prevailing lack of proper and uniform seismic design guidelines for piping systems impels designers to follow standards conceived for other structures, such as buildings. The modern performance-based design approach is yet to be widely adopted for piping systems, while the allowable stress design method is still the customary practice. This paper presents a performance-based seismic analysis of petrochemical piping systems coupled with support structures through a case study. We start with a concept of performance-based analysis, followed by establishing a link between limit states and earthquake levels, exemplifying Eurocode and Italian prescriptions. A brief critical review on seismic design criteria of piping, including interactions between piping and support, is offered thereafter. Finally, to illustrate actual applications of the performance-based analysis, non-linear analyses on a realistic petrochemical piping system is performed to assess its seismic performance.

Practical Application of Fastener Preload Guidance Research

2008 ◽  
Author(s):  
John Ludman ◽  
A. Fitzgerald Waterland
Keyword(s):  
Design Codes ◽  
Practical Application ◽  
Fugitive Emissions ◽  
Process Industries ◽  
New Approach ◽  
Engineering Controls ◽  
Bolt Preload ◽  
The World ◽  
Bolted Flange ◽  
Selection Of

Bolted flanged connections (BFC) in North America and throughout the world are designed, fabricated and constructed according to several design codes and component standards including the ASME Boiler and Pressure Vessel Code and ASME B31 Piping Codes. Despite the considerable engineering controls in place to ensure proper equipment design, bolted flange connections are all too often the source of leaks, fugitive emissions and process shutdowns in the process industries. A significant contributing cause of flange leaks is the limited understanding, of and improper selection and application of optimum assembly preloads on flange fasteners. Currently there are several “rule of thumb” approaches for identifying assembly bolt preload; each of these has limitations and short-comings that practitioners of these approaches need to be aware of. A new approach providing guidance to the selection of assembly preload bolt stresses is detailed.

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