Investigations
CNG TANK EXPLODING IN A FIRE
NHTSA Preliminary Evaluation PE02071 - closed, opened 2002-10-01.
NHTSA investigation PE02071 is a Preliminary Evaluation opened on 2002-10-01 and currently closed. The subject is tracked inside the Office of Defects Investigation queue. Latest activity on this investigation was logged on 2003-01-27 - NHTSA updates that field whenever an Information Request goes out, a supplement is filed, or a status change is recorded in the public docket.
A Preliminary Evaluation like PE02071 is the entry point of the federal defect-investigation process. NHTSA engineers scan complaint databases, field reports, and manufacturer data to decide whether an Engineering Analysis is warranted, whether a voluntary recall is already sufficient, or whether the pattern does not rise to a defect finding.
Investigators summarized the matter as follows: "AN EXPLOSION OF A COMPRESSED NATURAL GAS (CNG) TANK SHOULD NOT BE ABLE TO OCCUR, AS THE TANK IS FITTED WITH A PRESSURE RELIEF DEVICE (PRD). THIS PRD SHOULD RELEASE THE CNG IN THE TANK, PRIOR TO THE PRESSURE REACHING THE..." Investigations are the early-warning layer of the federal auto-safety system, sitting upstream of formal recalls and defect orders. Whether this one closes without action or escalates into an Engineering Analysis, the full history stays in the ODI archive so researchers, litigators, and buyers can pull the paper trail at any time.
Investigation Summary
AN EXPLOSION OF A COMPRESSED NATURAL GAS (CNG) TANK SHOULD NOT BE ABLE TO OCCUR, AS THE TANK IS FITTED WITH A PRESSURE RELIEF DEVICE (PRD). THIS PRD SHOULD RELEASE THE CNG IN THE TANK, PRIOR TO THE PRESSURE REACHING THE TANK BURST PRESSURE. THE PRD DID NOT RELEASE IN THE SUBJECT WISCONSIN POLICE CRUISER EXPLOSION. NHTSA HAS RECOVERED THE PRD VALVE FROM THE TANK THAT EXPLODED AND TESTING WILL BE NECESSARY TO ESTABLISH WHY THIS TANK SAFETY VALVE DID NOT RELEASE IN THE VERY HIGH TEMPERATURE FIRE THAT OCCURRED IN THE POLICE CRUISER. THERE IS ONLY THE SINGLE KNOWN EVENT, BUT DUE TO THE CATASTROPIC FORCE OF SUCH AN EXPLOSION AND THE POTENTIAL FOR INJURY AND LOSS OF LIFE, THIS INVESTIGATION IS BEING UPGRADED.
About This Investigation Type
A Preliminary Evaluation (PE) is the first phase of NHTSA's investigation process. It is opened when the agency identifies a potential safety defect pattern, usually triggered by consumer complaints, manufacturer reports, or field monitoring. During a PE, NHTSA gathers information to determine whether a formal engineering analysis is warranted.
Data from NHTSA Office of Defects Investigation. Cross-references: NHTSA recall campaign API and NHTSA FARS where fatality records overlap. PlainCars does not rate or recommend vehicles. about how PlainCars sources NHTSA data.
Read our methodology - how this data is sourced, computed, and verified.