Safety issues associated with the use and operation of natural gas vehicles: learning from accidents in Pakistan

Abstract The use natural gas in transportation is well established globally with over 18 million natural gas vehicles (NGVs) distributed through more than 90 countries of the world. This paper discusses several safety issues involved with using natural gas as a transportation fuel. After introducing the NGVs safety aspects and reviewing various standards for compressed natural gas (CNG) system, the paper discusses the 55 CNG-related accidents in Pakistan (which conduced to over 250 casualties) and analyzes the causes for these accidents and extracts “lessons to be learned” for CNG. The analysis reveals that due to low-quality CNG system material, e.g., CNG cylinder, CNG design and installation, maintenance system, etc., lack of strict government CNG vehicle safety regulations and driver negligence every year several CNG vehicles’ accidents took place in Pakistan which showed a major threat to life in Pakistan.

[1]  V. Pirouzpanah,et al.  Prediction of Major Pollutants Emission in Direct - Injection Dual - Fuel Diesel and Natural - Gas Engines , 1999 .

[2]  Lionel Perrette,et al.  CNG buses fire safety : learnings from recent accidents in France and Germany , 2007 .

[3]  K. Chandler,et al.  Washington Metropolitan Area Transit Authority: Compressed Natural Gas Transit Bus Evaluation , 2006 .

[4]  Muhammad Imran Khan,et al.  Development of natural gas as a vehicular fuel in Pakistan: Issues and prospects , 2014 .

[5]  Mehrdad Khamforoush,et al.  Compressed natural gas behavior in a natural gas vehicle fuel tank during fast filling process: Mathematical modeling, thermodynamic analysis, and optimization , 2014 .

[6]  Ramon Molina Valle,et al.  Performance and Emission Analysis of the Turbocharged Spark-Ignition Engine Converted to Natural Gas , 2003 .

[7]  Samuel C. Nelson,et al.  Overview of the Safety Issues Associated with the Compressed Natural Gas Fuel System and Electric Drive System in a Heavy Hybrid Electric Vehicle , 2002 .

[8]  Ahmad Husseini,et al.  Canadian standards association , 1993 .

[9]  S. Lie,et al.  Failure pressure prediction of a cracked compressed natural gas (CNG) cylinder using failure assessment diagram , 2014 .

[10]  Navid NoorAliPour Nahavandi,et al.  Numerical simulation of filling process of natural gas onboard vehicle cylinder , 2013, Journal of the Brazilian Society of Mechanical Sciences and Engineering.

[11]  M. A. Amalina,et al.  An experimental investigation of CNG as an alternative fuel for a retrofitted gasoline vehicle , 2006 .

[12]  Kichiro Kato,et al.  Development of Engine for Natural Gas Vehicle , 1999 .

[13]  Syed Yousufuddin,et al.  Effect of Ignition Timing, Equivalence Ratio, and Compression Ratio on the Performance and Emission Characteristics of a Variable Compression Ratio Si Engine using Ethanol-Unleaded Gasoline Blends , 2008 .

[14]  Daniel B. Olsen,et al.  Methane number testing of alternative gaseous fuels , 2009 .

[15]  Yamato Tadao,et al.  Stratification of In-cylinder Mixture Distributions by Tuned Port Injection in a 4-valve SI Gas Engine , 2001 .

[16]  Abdul Shakoor,et al.  Technical overview of compressed natural gas (CNG) as a transportation fuel , 2015 .

[17]  Michael J. Economides,et al.  The state of natural gas , 2009 .