international aircraft systems fire protection working group atlantic city, nj usa5nov2003 federal...

International Aircraft Systems Fire Protection Working Group

Atlantic City , NJ USA 5Nov2003

Federal Aviation AdministrationWJ Hughes Technical Center, Fire Safety Section, AAR-440

Atlantic City Int'l Airport, NJ 08405 USA

Engine Nacelle Halon Replacement,FAA, WJ Hughes Technical Center

Point of Contact : Doug Ingerson

Department of Transportation

Federal Aviation Administration

WJ Hughes Technical Center

Fire Safety Branch, AAR-440

Bldg 205


tel: 609-485-4945

fax: 609-485-7074

email: [email protected]

web page: http://www.fire.tc.faa.gov/

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CONTENTS

• briefly EXPLAIN the equivalence process

• EXPLAIN the equivalent mass and concentration methods

• ILLUSTRATE results to date - mass/concentration equivalence

• DISCUSS what work remains

International Aircraft Systems Fire Protection Working GroupAtlantic City , NJ USA 5Nov2003



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• briefly EXPLAIN the equivalence process




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PROJECT OBJECTIVES

• GENERATE A PROCEDURE WHICH CAN BE USED BY ANYONE TO DEMONSTRATE EQUIVALENCE TO HALON 1301 IN THE NACELLE

• PRODUCE CERTIFICATION CRITERIA FOR HFC-125 AND CF3I




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Halon 1301

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Con

cent

rati

on

certification

6%

Time (sec)

CONCENTRATION TEST

ESTABLISH BENCHMARK for

HALON 1301

RTD(ave, H1301)

FIRE TEST

FIND MASS EQUIVALENT OF THE

REPLACEMENT CANDIDATE

RTD(ave, rep.can) RTD(ave, H1301)

FIRE TEST

Replacement Candidate

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umet

ric

Con

cent

rati

on

Time (sec)

CONCENTRATION TESTCEQUIV

“certification”

AnalyzerProbes,

Certification




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• EXPLAIN the equivalent mass and concentration methods




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EQUIVALENCE METHOD - MASS

• HALON 1301 CHARACTERIZED AGAINST FIRE THREATS

• USING SALIENT ENVIRONMENTAL ASPECTS IN A TEST FIXTURE

• 2 COMBUSTION SCENARIOS - SPRAY & POOL

• 3 FUELS - TURBINE FUEL, LUBRICANT, HYDRAULIC FLUID

• MEASURE THE DURATION THE FIRE IS EXTINGUISHED

• BENCHMARK BASED ON THE AVERAGE OF 5 TESTS

• ITERATE MASS OF THE REPLACEMENT CANDIDATE

• AGENT DISTRIBUTION CONSTRAINED - NOT OPTIMIZED

• AVERAGE OF 5 TESTS MUST EQUAL OR EXCEED HALON BENCHMARK




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Halon 1301

Replacement Candidate

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A Representation of Typical Concentration Traces for Halon 1301 and a Mass Equivalent Amount of a

Replacement Candidate at the Flame Front

Time (sec)

Concentration Equivalence Step #1

Establish the duration that the

Halon 1301 concentration at the flame front is at/above 6% v/v.

6%

t H1301

EQUIVALENCE METHOD - CONCENTRATION

Concentration Equivalence Step #2

Use the duration from the Halon

1301 concentration profile and review the profile of the

replacement candidate to find the corresponding

concentration (CEQUIV).

t H1301CEQUIV

certification

Notice the characteristics of the typical trace at the flame front in the certification profile :

• Exponential growth & decay does not permit a square wave function to meet certification.

• A marginal increase in the concentration profile ensured the variability in testing never produced a concentration profile less than certification.

• The concentration trace exceeds 6%v/v Halon 1301 for more time than 0.5 second.

6%

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US

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Federal A

viation Adm

inistrationW

J Hughes T

echnical Center, F

ire Safety S

ection, AA

R-440

Atlantic C

ity Int'l Airport, N

J 08405 US

AS

LID

E#

8

Equivalence for concentration

• spray fire work based on channels 1 & 2

• evaluated channels for the duration at or above 6% v/v

• took average of the 2 channels over 3 tests




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duration of Halon 1301 for

concentration 6%v/v

Equivalent concentration for the replacement

candidate




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• ILLUSTRATE results to date




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RESULTS TO DATE - MASS EQUIVALENCE

• WARNING !!

• DO NOT USE THESE NUMBERS FOR COMPARISON

• AGENT DISTRIBUTION IS NOT OPTIMIZED

• REPLACEMENT CANDIDATE QUANTITIES ARE ARTIFICIALLY LARGE

• GAS CONCENTRATION IS THE ONLY VALID BASIS FOR COMPARISON

• QUANTITIES REPORTED FOR THE PURPOSE OF COMPLETENESS

• SPRAY FIRE, HIGH VENTILATION

• 3.6 LBF HALON 1301 = 8.0 LBF HFC-125 = 4.5 LBF CF3I

• POOL FIRE, HIGH VENTILATION

• 3.6 LBF HALON 1301 = 5.5 LBF HFC-125




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AnalyzerProbes,

Pool

AnalyzerProbes,Spray

RESULTS TO DATE - CONCENTRATION EQUIVALENCE




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International Aircraft Systems Fire Protection Working Group

Atlantic City , NJ USA 5Nov2003



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• DISCUSS what work remains




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TESTING REMAINING

• CF3I => pool @ high ventilation

• HFC-125 => spray & pool @ low ventilation

• CF3I => spray & pool @ low ventilation

• HFC-125 & CF3I cold agent proof tests

• COMPLETION => SUMMER 2004




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Click Here to End

9

11

8

1

75

3

6

1210

4

REGION OF FLAMEDURING FIRE TEST

FWD

UP

RIGHT3:00

UP12:00

ST

A 5

02

ST

A 5

27

2

DIMENSIONS AREIN FEET UNLESS

NOTED OTHERWISE

LOOKINGFWD

GAS ANALYZER PROBE ARRANGEMENT, HALON 1301 CERTIFICATION WORK

5

13




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# 17

9

11

8

1

7

2

3

6

1210

4

REGION OF FLAMEDURING FIRE TEST

FWD

UP

RIGHT3:00

UP12:00

ST

A 5

02

ST

A 5

27

5DIMENSIONS AREIN FEET UNLESS

NOTED OTHERWISE

LOOKINGFWD

GAS ANALYZER PROBE ARRANGEMENT, HALON 1301 CERTIFICATION WORK

13




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A Representation of a Typical Concentration Trace for a Mass Equivalent Amount of a

Replacement Candidate at the Flame Front

~ Generating the Concentration Data Pool for the Replacement Candidate ~

EQUIVALENCE METHOD - CONCENTRATION

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# 19

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Con

cent

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Time (sec)

8%

9%

7%

6%

10%

DURATIONS AT/ABOVE A GIVEN CONCENTRATION




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