NIST instrument will assist army autos battle fires utilizing much less dangerous chemical compounds

The U.S. Military makes use of NIST’s PROFISSY pc program to assist perceive the efficiency and calculate the utmost charging stress for this automated hearth extinguishing system, which protects the crew in an armored floor car from explosive fires. Credit score: U.S. Military

Researchers on the Nationwide Institute of Requirements and Know-how (NIST) have developed a brand new, interactive spreadsheet that may assist the U.S. army extinguish plane and car fires utilizing the most recent environmentally pleasant chemical compounds.

Whereas it could sound old-school, the spreadsheet is definitely an improve of a NIST pc program that has helped shield priceless army property and lives for a number of many years, regardless of being based mostly on the classic working system MS-DOS.

Fireplace safety is a significant subject for army autos, which carry flammable fluids and may incur vital injury and casualties in accidents or fight. These autos carry hand-held hearth extinguishers amongst different fire-suppression programs. A problem is filling the bottles in such a approach that the warmth of a fireplace doesn’t increase the stress to the purpose of explosion. Calculations are wanted to securely mix a hearth suppressant agent with the nitrogen that expels and disperses the chemical. One other problem is what agent to make use of. Efforts are underway to establish hearth suppression brokers with low or no world warming potential (GWP).

Within the Nineties, NIST researchers developed a pc program for bottle-filling calculations referred to as PROFISSY (PROperties of FIre Suppressant SYstems), which was distributed informally and has been broadly used. However the previous supply code made it troublesome so as to add new fluids. NIST has now changed PROFISSY with a spreadsheet that has further performance and fluids and in addition hyperlinks to NIST’s REFPROP database, which incorporates properties of many further chemical compounds and mixtures. REFPROP has been broadly adopted as a normal within the refrigerants neighborhood and in addition incorporates hearth suppressing brokers, together with environmentally preferable options to halons that deplete Earth’s protecting ozone layer and hydrofluorocarbons that contribute to world warming.

“We have been utilizing PROFISSY for a few years to facilitate design of fireplace extinguishers for take a look at and analysis, particularly with non-halon and low-GWP hearth suppression brokers the place off-the-shelf merchandise will not be out there,” stated Steven Hodges of the U.S. Military’s Floor Automobile Methods Middle Fireplace Safety Staff.

“PROFISSY is a useful instrument once we are working with developmental supplies as a result of it offers us a foundation to imagine that we’re testing extinguishers that may be viable merchandise, that’s, meet environmental necessities similar to having the ability to safely function at temperature extremes,” Hodges added. “The unique DOS-based PROFISSY has been an indispensable workhorse; the brand new PROFISSY instrument provides functionality, improves accuracy, and is far simpler to make use of, increase and preserve.”

The Military is evaluating a number of environmentally pleasant, low-GWP chemical compounds as potential fire- extinguishing brokers for its autos, a continuation of analysis carried out for floor and aviation weapon programs, Hodges stated.

“I imagine most, if not all, of the U.S. industrial and army plane producers have used PROFISSY in plane hearth suppression system design and growth,” stated Jiann Yang, deputy chief of the NIST Fireplace Analysis Division. “PROFISSY is an efficient instance of the return on funding of federal analysis.”


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Extra data:
Marcia L. Huber et al. PROperties of FIre Suppressant SYstems “PROFISSY” A Spreadsheet Software for Fireplace-Suppressant Bottle-Filling Calculations, NIST Technical Notice 2132 (2021). DOI: 10.6028/NIST.TN.2132

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NIST instrument will assist army autos battle fires utilizing much less dangerous chemical compounds (2021, March 3)
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