scholarly journals Forensic Engineering Analysis Of A Propane fueled Residential Gas Explosion

2011 ◽  
Vol 28 (1) ◽  
Author(s):  
David S. Komm
Keyword(s):  
Gas Migration ◽  
Root Cause ◽  
Residential Heating ◽  
Gas Leak ◽  
Gas System ◽  
Flammable Gas ◽  
Forensic Engineering ◽  
Safety Features ◽  
Gas Leaks ◽  
Selection Of

The Use Of Liquid Petroleum Or Commercial Propane Gas (Hereafter Referred To As Propane) For Residential heating And Cooking Is Common In The Rural United States Where Providing The Infrastructure For natural Gas Distribution Would Be Too Costly. A Typical Installation May Include A 500 Gallon Pressurized vessel Containing A Mixture Of Liquid And Vapor Propane With The Vapor Fed To An Individual Residence through An Underground Line. Safety Features, Such As Odorization Of The Propane, Multi-Regulator Installations, prudent Selection Of Gas Line Components, And System Leak Checks Are Utilized To Prevent And/Or recognize Fugitive Gas Leaks.  in 2005 An Event Occurred In Michigan Which Involved A Flammable Gas Leak, Corrosion, Gas Migration through Soil, A Buildup Of The Flammable Gas, And Subsequent Ignition Resulting In An Explosion which Destroyed A Two Story Home. This Forensic Investigation Eventually Revealed That The Root Cause Of the Incident Lay In Actions Taken During The Original Construction. Some 16 Years After The Installation Of the Subject Gas System Circumstances Came Together To Create An Explosion.

scholarly journals System Design for Early Detection of Explosive and Flammable Gas Leaks Using Mobile Robot in Confined Space

2021 ◽  
Vol 2107 (1) ◽  
pp. 012028
Author(s):  
M A Abu Bakar ◽  
M R Manan ◽  
R M Kawi ◽  
L J Yunn
Keyword(s):  
Gas Sensors ◽  
Specific Area ◽  
Prototype System ◽  
Confined Space ◽  
Liquefied Petroleum Gas ◽  
Gas Leak ◽  
Environment Temperature ◽  
Flammable Gas ◽  
Air Sample ◽  
Gas Leaks

Abstract The presence of explosive or flammable gases in confined space may contribute towards accidents that threaten the workers safety and industrial progress. Conventionally, the existing instrument for gas detection in confined space is manually carried by humans whereby the workers or competence person itself were exposed directly to the gases. This project is aim to develop a prototype system to detect the presence of gases leak where the robotic system replaces humans to carry gas sensors. Users only need to maneuver the robot using a mobile phone to monitor the specific area that may have an explosive or flammable gas leak which includes Liquefied Petroleum Gas (LPG) and methane gases. The sensors will detect if a change in the gas concentration has exceeded a safety limit and will activate the alarm as an alert signal. The readings of gases as input signals were sent wirelessly to the Personal Computer (PC) as a user device for monitoring purposes. This prototype is successfully developed, tested and calibrated using the samples of LPG gas, methane, smoke and environment temperature. The result proved that the developed system is able to detect an air sample using selected gas sensors and display the data in graph form with live monitoring. This will contribute significantly to acquiring a new and alternative method using the system for detecting the presence of gases in confined space application.

scholarly journals Forensic Engineering Assessments Of Ruptured Acetylene Cylinders

2011 ◽  
Vol 28 (1) ◽  
Author(s):  
Jesse A. Grantham
Keyword(s):  
Mechanical Damage ◽  
Mechanical Tests ◽  
Cylinder Wall ◽  
Metal Shell ◽  
Visual Examination ◽  
Building Fire ◽  
Gas Leak ◽  
Forensic Engineering ◽  
Gas Leaks ◽  
Business Interruption

Ruptured Acetylene Cylinder Remnants And Exemplar Acetylene Cylinders, Exposed To A Building Fire, Were Assessed For Pre-Explosion Gas Leak Potential In The Metallurgical Laboratory Using Forensicngineering Protocols. In This Case, 2 Acetylene Cylinders Exploded, And A Building Fire Caused Extensiveroperty Damage And Business Interruption At A Welding Fabrication Facility. Possibilities Of Metallurgicalailures For The Cylinder Shell, Fuse Plugs And Valves Included A Series Of Mechanical Tests, Nondestructiveests And Microscopy Protocols. The Forensic Engineer Considered Corrosive Effects From Constituent Elementsn The Acetylene Gas And The Porous Media Saturated With Acetone Inside The Acetylene Cylinders. Lso, Leaks From Mechanical Damage Were Considered In The Shell, Head, Bottom, Fuse Plugs And Valve. He Forensic Engineer Examined The Cylinder Wall Fracture Surface Features, Pressure Vessel Design, Wallhickness, Low-Melting Temperature Fuse Plugs, And Valve Designs. He Forensic Engineer Scope Of Work Included Visual Examination Of The Cylinder Metal Shell,Ractured Edge Surfaces, Fuse Plug Attachments, And Valves To Ssess Possible Metallurgical Causes Forre-Explosion Gas Leaks From The Acetylene Cylinders Due To Corrosion Or Mechanical Damage Before Theylinder Rupture Events.

Enhancing CAD For The Forensic Engineer

1984 ◽  
Vol 2 (1) ◽  
Author(s):  
Lindley Manning
Keyword(s):  
Computer Graphics ◽  
Photographic Evidence ◽  
Computer Aided ◽  
Engineering Drawings ◽  
Forensic Engineering ◽  
Selection Of

The purpose of this paper is to inform the Academy of an application of computer graphics that has been successful in the court room and which has the potential for extension to many related needs of the forensic engineer. An additional purpose is to examine the possibility of cooperation within the Academy to make a broad database and selection of equipment available to the members. Attentive engineers of today are well aware of the growing use and impact of computer-aided drafting, design and analysis in a wide variety of industries. In our field, we are aware of large analysis programs which have been used with success in court, for example the CRASH series. The authors forensic engineering partnership has developed ways to utilize the more widely available drafting systems to inexpensively fill the gap between photographic evidence and full engineering drawings. We have also found that CAD drawings appear to have more impact in court than hand done drawings. In some cases

scholarly journals Forensic Engineering Techniques For Testing And Predicting Lp-Gas Container Relief Venting

2004 ◽  
Vol 21 (2) ◽  
Author(s):  
James A. Petersen
Keyword(s):  
Test Data ◽  
Pressure Relief Valve ◽  
Relief Valve ◽  
Pressure Relief ◽  
Temperature Changes ◽  
Flammable Gas ◽  
Forensic Engineering ◽  
Pressure Changes ◽  
Liquefied Gas

When An Lp-Gas Container Is Involved In A Fire, Flammable Gas Is Usually Vented From The Relief Valve. One Of The First Questions Is Whether The Container Vented The Gas That Caused The Fire Or Whether Gas Was Vented Due To The Fire Heating The Container. If The Relief Valve Vents Gas That Initiates The Fire, It Is Usually Due To An Overfilled Container. This Paper Discusses; 1) The Prediction Of The Rate Of Container Warming Due To Normal Temperature Changes, 2) The Resulting Pressure Changes Of The Liquefied Gas, 3) The Reaction Of The Pressure Relief Valve And The Quantity Of Lp-Gas Vented During The Operation Of The Relief Valve, 4) Designing The Experiment And 4) Adjusting The Model To Reflect Test Data.

scholarly journals Penerapan Fuzzy Logic pada Sistem Pendeteksi Gas C4h10 dalam Ruangan sebagai Media untuk Menampilkan Bahaya Berbasis Android dan Graphical User Interface

KOMTEKINFO ◽  
2019 ◽  
Vol 6 (1) ◽  
pp. 40-49
Author(s):  
Defnizal
Keyword(s):  
Graphical User Interface ◽  
Fire Hazard ◽  
Android Application ◽  
Gas Leakage ◽  
Fuzzy Methods ◽  
Gas Leak ◽  
The Status ◽  
Hazard Level ◽  
Gas Leaks ◽  
The Impact

Gas is one of the needs that is widely used by the community. The use of gas is very much beneficial, for example, such as the use of gas in households and the use of gas in business or industry. However, there are things we must pay attention to when using gas in terms of safety. Because gas is volatile and there is a possibility of gas leakage which can cause a fire hazard. Therefore to reduce the impact of hazards that can be caused due to gas leakage, a gas leak detection device needs to be made using the MQ5 sensor and the status of the hazard level will be displayed through the android application. So that the existence of this tool will make it easier for users to know the level of gas levels and the level of danger of gas leaks. In this system there are 3 (three) levels of danger, namely safe, normal, and dangerous. If the gas level is high and in danger status, the system will provide information on the android application in the form of gas levels, danger levels and alarms. The use of Fuzzy methods in this system can be applied to explore knowledge and decision making, so that the Fuzzy method is applied to be expected to help in calculating the level of danger of gas leakage effectively and safely to use. In designing this system, the author uses the Fuzzy algorithm with the Mamdani method so that it can facilitate obtaining maximum results in determining the level of danger. From the resulting output can be information about the dangers of gas leakage.

scholarly journals Forensic Engineering Evaluation of Excessive Differential Settlement on Compressible Clays

2021 ◽  
Vol 37 (1) ◽  
Author(s):  
Rune Storesund ◽  
Alan Kropp
Keyword(s):  
Variable Thickness ◽  
Differential Settlement ◽  
Housing Project ◽  
Root Cause ◽  
Forensic Engineering ◽  
Thickness Layer

This forensic engineering (FE) study evaluated root cause errors associated with excessive differential settlements on a housing project constructed on top of a variable thickness layer of highly compressible clays. The structures were reported to have experienced differential settlements on the order of 2 to 10 in. across 40 ft. The FE study examined fundamental assumptions, granularity/resolution of the settlement and differential settlement analyses, and finalized grading plan vs. the conceptual grading plan used as a basis for the differential settlement predictions. The FE study found numerous discrepancies between the “idealized site” used as a basis of analysis and the “actual site” as constructed.

scholarly journals Gas System for the ATLAS NSW Micromegas Detectors: Design Aspects and Advanced Validation Methods for their QA/QC

2019 ◽  
Vol 24 ◽  
pp. 23 ◽  
Author(s):  
T. Alexopoulos ◽  
E. Gazis ◽  
S. Maltezos ◽  
A. Antoniou ◽  
V. Gika ◽  
...  
Keyword(s):  
Distribution System ◽  
Gas Flow ◽  
Test Methods ◽  
Gas Leak ◽  
Gas System ◽  
Medical Needles ◽  
Flow Pressure ◽  
Loss Method ◽  
Lock In ◽  
Rate Loss

In this work we present the design aspects of the Gas Distribution System of NSW Micromegas detectors, simulation results and gas flow / pressure uniformity. We also describe the appropriate gas leak test methods, a conventional and an alternative one, being used in the Quality Assurance and Quality Control of the detectors. For the performance studies we used emulated leak branches based on medical needles. We also describe proposed upgrade stages combining the proposed competitive Flow Rate Loss method with the Lock-in Amplifier technique. Further, we describe the baseline setup for the Gas Tightness Station at BB5/CERN.

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