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NATIONAL BUREAU OF STANDARDS REPORT

NIBS PROJECT NBS REPORT

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IMPORTANT NOTICE

NATIONAL BUREAU OF ST

intended for use within the

to additional evaluation and

listing of this Report, either

the Office of the Director, N

however, by the Government

to reproduce additional copi

progress accounting documents

Approved for public release by the o'petmS^

Director of the National Institute of ssion is obtained in writing from Such permission is not needed, Standards and Technology (NIST)

on October 9, 2015.

/ prepared if that agency wishes

<NBS>

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
'
mrm %mwumw mm m worn wuc-mD

by

James f, tiym

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ABffiUCT

o«r M&fetad assemblies were subjected to

standard fire tests to determine their suitability

for approval by the U* >* ha&sf huard for use on

eereii&nt vessels, tm assemblies were tested In

pairs* The specimens hi etch pair differed in tee

material making up the bulkhesd panels j the pairs

differed in the Joint and mounting details* The

unexposad surface temperatures of all four

specious r&mSmd within the specified limits

for times between 16 aid 25 minutes* The two

specimens of the first pair were effective barriers

to the passage of flcue for less than 30 minute ss those of the second pair for the full 60 minute

test period*

1* Introduction

At the request of the th &, toast Guard (letters of

February 13* 195? and July 31* 195?) two fire endurance

tests were made in compliance with. TUtopsrt 164**00 i~ 3 (i>)

of specification for ruLktestd Panels for lierchaot tessels*

East* fire test was made on two spec!asms of oar Hite

manufactured by the Asmi Asbestos do* ? ltd* of Tokyo*

Japan*

2* test Specimens

within each pair of specimens, am was of iarillte wi

in sheets about 7/8-in* thick, the other of MarHite r USing two thicknesses of about 3/8-in* each for a total a*

about 3/4-in* The first pair had the larllite panels

moderately well restrained* The steel joiner members mvo

attached to the base supporting members and to a plate and

angle across the top of each specimen# lu tl» second pair
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provisions had been to allow the elegants of the

specimens to expand. Tb& joiner members merely set on

the flanges of base channels and fit between ceiling

trim elements. ih© base charge1 had stools welded to

it intended to provide i/4-in. clearance below the base*

however, the stools collapsed wider the weights of the

specifiers so the bases wore blocked up. fhere was

about 1-in* clearance between the furnace frame and

the top of the mar Hit® panels. fft© details of the various

specimens are shown in figure 1.

3* lest method

lie two bulkheads of each pair wore mounted in a

single test fr mm that had been subdivided for bulkhead

tests. Sight thermocouples were planed ®m the unexposed

surface of each bulkhead* felted asbestos pad 6- x 6-

x 0.4 in. was placed to cover the junction and several

inches of the wires of each thermocouple, the locations

end distribution of these thermocouples are shown in figures

2 m& 5. Ilie furnace fires ware controlled to produce

temperatures as close as feasible t© those defiiied by

the standard time-temperature curve of £8TH "2-119? which

include lOOC’P at 5 almifces, 1300 ; - at 10 minutes,

j>* at 30 minutes and 1700' '"F at 1 Hour, fhe furnace

temperatures were indicated by thermocouples ene ased in

porcelain insulators and iron pipes in the furnace

chamber.

4. msuits

Tim conditions of tlys two pairs of specimens Immediately

before test are shown in figures 2 mi 3.

4.1 test 390

'3m test of the first pair of specimens , in which the

joiner members were secured , was conducted March 4, 1957*

In addition to personnel of the Wad Fire Protection .'.section,

the following were among those witnessing the tests

m. &* Bell? Jr. f LCMif Hit 2, ashington, >» *.•

Ju. ^oluccieXlo, at., UXa, ashington, • * IU •.. rfeisel, Johns-hanviile Research, f&eiviHe, ov

Jersey

Furt lowers, Johas-u&ivillc , Washington, ;.• c.
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Several soall bucklings developed ia Um exposed

surface portions of both joiner members during the initial

3 situates* the first crack in the unexposad surface of the

ML <7/3 in*) specimen urns observed at 1C 1/2 minutes,

horizontal crack extended across the narrow section of the

Pi GA ia*) spec&mn at 17 atonies* Ira glow of the

furnace fires was visible through a crack across the narrow

section of tine MX specimen at .21 alnuiss* the flicker

of flint* was visible through a similar crack in the Fh

specIson at 23 laiautes* < ,-oth joiner sweaters developer

significant buckling mad a piece of the 3/3 in* thick

material was displaced from the exposed surface of the P

specimen at 2? 1/2 minutes* dim test was stopped at 29

mkmtime* The WH speeisaea had attained a mesimm deflection

of 2*3 in* at its seaiar, mA the P-1 speetisen 2*0 la*, as

aaam*ed just before the end of the test*

%© fire exposure severity was 94- *2 percent* %e

time at which the limiting maAltl®m were reached on the

unexposad -surfaces of the two specimens are given in the

following table*

&&2P£ av rise

325°? rise

Floats though

Panel JoLier

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3Hhe condition of the fpee&aens after the tests are shorn

in figures 3 and 4*

4*2 Test 394

t&e test of the second pair of specimens , ia which

the joiner methmre were not attached to any other Mars

sad were stele to expand without restraint, rak conducted

July 30* 1937* m motion, to personnel of the « . ire

Protection! Jecteion, the following were aseong those witnessing

the tests

L* C olucciello * it., ®5Cte. nashiagtoa, D. C*

XU . ... fetsel, JctaMianville .issearen Center

Mauvllle t ew Jersey

dart Power, aolins^anville , daskingtoa, i* C

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borae smoke froa between toe wisxposed surface

sad the top trim of the P~1 apeclaaa around 4 minuter*

Minor local buckling of fine exposed surface portions of

the joiner members mi base trim were observed at 13

minutes* fhre© mam of less than 1 ft* each on the

exposed surface of the Hi specimen shew©# flaking by

26 slant©#* Tim \smxpomt& swfaces at hath specimens

showed. som localised lamnSag along joiners or top trim

by the siu'd© tizaa# id cracks developed ia the uaexwed

surface and only slight discoloration developed by the

arm of the test at 1 hour 2 minutes. She w&dumm observed

deflections at the centers of the specimens were 0*7 in.

for the Hi specimen at 10 m& 0*6 in* for the P-1

specimen at 50 minutes and thereafter, the for:ner was

toward the fire, the latter may from it*

the fire exposure severity was 101*0 percent, -he

tlaae at which tbs lifting conditions on the mnexposed

surfaces were reached are given in the following table.

2*?0®F sv rise

325^0 max rise

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Panel Joiner

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* light local Irea-ming eOeag '> 0.1 ier an,-’ top trie indie? te

passage of hot gases, no flail© observed*

the condition of the &pmlxmm after the test is shown in

figure s € and 7 *

5* Discussion and Conclusions

She resets of test 3^0 showed that the panels were

sufficiently resistant to beet transmission to hold the

unexposed surface temperatures below the allowable limits

for 16 to 2S- .minutes whereas the specification (U * Q

164.000-3 lb) ) requires only 15' minutes* however, cracks

developed which destroyed the flame barrier integrity of
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each speeiisan ia 21 to 23 niautes. therefore , neither

specimen could Qualify for my of the construction

classes defined ia the specification because ert least

30 minutes integrity as a flame barrier is required*

the results of test 39** showed the importance of

allowance for thermal expansion. fhe bulkhead panels and

joiner ambers »/ere identical to the corresponding

specimen cos^porieats of test 390, apparently* the

significant difference s between the two sets of test

specimens were in the "counting systems which provided

for thermal expansion in the latter test* Ms a result

the two spmtmms remained effective barriers to the

passage of flame for the full test dur&tion of 1 hour, 2

minutes* the temperatures on the unaxposod surfaces

of the panels mm within the specified limits for 20

to

would both

jt the __ hlaas ~6o construction*

my expand into a slot or groove is a good solution to

the problem of thermal expansion* I-Unitnw» it caa 1mmi

to me&m&Q as a flams barrier. Ibis iftmess was

avoided in tbs specious tested by design and fabrication

to provide good fit of the elements of closure around

the expansion joint or mss* Care during erection in the

field, coupled with careful inspection, should be practiced

to Insure integrity as a flatus barrier*
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tost 39^- and construction

details

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TEST

390

Vig-. 2* ipaetmm in^lately h®fom test 390*

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^ig. 3. Ihsxposeci surfaces of specin^ns at

end of test 390



Fig# ^* surfacm of sp&clmns

after test 390

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&p&cimns Iw-ma lately before test
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