The concentrations of certain gases generated during fire suppression were determined as part of the evaluation of the automatic fire extinguishing system for the Advanced Amphibious Assault Vehicle. The measurements were performed in a test facility located at Camp Pendleton, CA over a six week period from June 25, 2001 through August 2, 2001. The atmosphere within the facility was monitored during 45 independent tests in which the origin of the fire, the location of the gas transfer lines, and the ventilation of the crew compartment were varied. Gaseous samples were pumped from the test facility to an enclosure housing the instruments where the time-varying concentrations of CF3CHFCF3, HF, CO, CO2, and O2 were measured. The concentrations of HF and CF3CHFCF3 were determined from Fourier transform infrared spectroscopy, whereas both Fourier transform and nondispersive infrared measurements were used to determine the concentrations of CO and CO2. The concentrations of O2 were obtained from magnetic susceptibility measurements. Peak and time weighted average concentrations of these gases are reported in a format that is consistent with the recommendations set forth in a report on instrumentation requirements and injury criteria for gas monitoring in armored combat vehicles issued by the Walter Reed Army Institute of Research.
Citation: NIST Interagency/Internal Report (NISTIR) - 6897
NIST Pub Series: NIST Interagency/Internal Report (NISTIR)
Pub Type: NIST Pubs
CO, CO2, concentration measurements, fire, fire research, FTIR, HF, HFC227, NDIR