i. , ^ _ NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

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NATIONAL BUREAU OF S

intended for use within the to additionai evaluation and

listing of this Report, eithei the Office of the Director, t however, by the Governmer

to reproduce additional cop

IMPORTANT NOTICE

progress accounting documents Approved for public release by the ^rmally published it is subjected

Director ot the National Institute of jsion is obtained in writing from Standards and Technology (NIST) Such permission is not needed, on October 9, 20 1 5. '

<NBS>

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

of

by

J. Ryaa

msT^ct

Fim biiliiiead assemblies subjected to

fire tests. speclmsa was made of iu.

thick ^rine board with a vertical jolut and

steel joint menber. the aesbers were of the

saine design in all specliK^-asi but the mriae

boards differed, the defined limiting tempera*

tur© rise was reached in from 12.6 to 16.2 .ain

for the various speolssens. All served as

barriers to the passage- of flames throughout the.

6o-isiii tests.

1. Introduction

At the re?xuest of the II. Jl. Cm.^t "mard (letter of

22 Aisrch 1960 >j five bulkhead assembly speeimeas were

subjected to fire tests la coi^llaaee with 3ubpert

16^.’^d-*3<bi of Specifleatlon for BullEhead ianals for

.lerchaat Masada.

2. Test Ipeciaens

The spociiseas were subiaitted by^ and sldlpped froa,

D&ask Aternit-Fabrik i/S, Aalborg | Benmrk. The spociaens

artd shipping container were received in good condition*

The specisieas were identified as follows i

1. Bavilite 3‘^> type ?*22 * both sides plain fini-sh^

3A la. thick, projposal 2.

2. Bavllite 3^t 3*22, both sides plain finish,

3A ia. thick, proposal 2.

. Aavilite 36, type F55, both sides veneered with

a&rd fop, 374- in. thick, proposal 1.

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Mavilite 42, type I.-22, botli sides plain finish,

3A In, thick, proposal i.

5* Ifa^ilite 4S, type i;-22, both sides plain finish,

3/4 in, thick, proposal 2*

The prox^osttT’ mimbers refer to alternate da tails at the top

of the sp^eeiuieii. these and other details arcf shorn in

llgnre 1, at the- end of this report* the specimens were

Feceived* assembled I therefore, the details are ba.sed

primarily on exa^dnation after test.

In general apj.earance, each speciraea consisted of t¥o

panels of aaarine board \^th a vertical Joint me-^ber, all

Koxmted in a frame'. The Joint member and frame were of

steel; and were assembled to allow for move^irt dne to

theriael ej^pansiofi. The mrlne boards wer# soderateXy* hs=rd,

white, and appeared to be of cesient-a-sbastos. Those for

speelmeB 3 kmd m veneer of vejry Imri smooth tasterial on

each face.

3. fast Method

The specimens were mennted in tm three openings of a

test frame modified to permit the simltencons fire e:s;posur6

of three bulklieads in th^ wall test furnace. Bulkheads 1,

2, and 3 were together in tfaa first test (4l4,ip4,

and & filler were testad together in the second

Care was taken that each specimen was restrained against

vertical saevemeat, so that the oaiy relief for thermal expsnsloH ms ti^t provided for in the design and fabrication

of the specimm. The peripheral Joixits between the specimens and the test frame were sealed with a fillet of piaster

on, the side t© be exposed to fire, this plaster fillet

covered ail the ®ctal members ©xeept ' that along the prescribed

vertical Joint fettwten the panel.s of Ma^alite boards. Bight

thermocouples were placed on the uneriposed surface of each

specimen, distritoyted. m shorn in the fig-ores. Ths Junction

and several iaehes of the wires of each the-rmoeouple were

covered by a 6- by 6- by 0,4-in. feltM asbestos pad. Twelve

thermocouples^ encased In poreclain insulators ead iron

pipes, were distributed, within the fumaeo chamber. The

furnace fires were controlled to produce average furnace

temperatures as close as feasible* to those of th^ standard

time-temp€rat?are curve of A3TK EI19, which lueiude- lOOO'^B

at 5 mia, 13OO® ah 10 min, 1550"^F at 30 min, 1700^

at 1 hr.
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Both tests were witnessed hf Baul Gi'osoa^^SCO,

waaMngtoxi, D, Q» aad personnel of the Hatiojml Bureau of

Standards I Fire ProteetioTi Sectien.

4,1 feat 4l4

the test of spealmena I, 2^ am 3 was sondneted on

ipril 7, 1-960, the hard veneer exposed, .s'urface of specimen

3~ l^mviiite 36 j type V55) spalled at 2 leaving about

half the original material In scattered pieces over the e-a.- posed area* this was followed by brief flawing over the

sfiallod areas, .jiaoke through the Joiat of specimen 3

at 21 min, 'fhe test was stoppe4 at 1 Ixr. there liad been

ao cracking of tha unexposed surface of say of the sp^dmeas.

fhe coi^ition of the specimens after test is shown in

Figures 2 and 3*

The time at ’4iich the limiting 2i?0^F rise was rc-at:^M

at the hlghe-st reading thermocouple on the unoitposed su2‘face

of the Eiarlne board of aaciA spaeijsen* as well as the ma;‘ilmun

deflection at tiie oenter of each^ is giwn in the following

table

1

250^*1* rise 4 tin!®* .min. 12.-

msL deflaeilont la. 1.2y

The fire exposurci severity was 101 per cent. Ho flames

passed tlirougk of the three specimens. Idditional

temperature data are presented la .figure I. The temperatures

fro-m the Joints mm averaged separately from those on tlie

aavllite boards.

<2 13.x

0.5

^ <r^ lo. &

1.25

4.2 Test 415

The test of spe-citaeas 4 and 5 was conducted April 143I96O.

€aeept for deflection due to bowing of the steel /maribers,

discoloration of the psiat on the latter, and sllgiit smoking

from the Joints over a 4^giin period, there were no observable

chaioges during the l-irr test, there was no craekiag of the

unexposed surface of either speelata. the conditioiisof th^

specimens after test were essentially the mmm as those of

speclsieas 1 and 2, shown in S'igures 2 3.
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The time at w>iieii the ll^^.iting 250 rise was reache4

at the Ijlghest readlag thermocouple on the unei^posed surface

of the mtlm hoard of t&ch specimoja^ as well as the r*a:iimusa

deflection at the center of each, is given in tlie following

table

4 5

250'^F risai rain, 1-4.3 12.

Max defiectiom, in.. i.?5 1*0

Ihe fire exposure severity was 9^.7 per cent, iio fiaiies

passed through either $peei;^ea. Mditionai temperature d.ata

ai'e presented in Figure i. fm temperatures from the Joints

wore averaget separatel/ from those on the liavilite boards.

$, Swsmry

'iho results of the two tests? inwlvin^ five ^.IKheali

spoeiaens, iMicated that re^ialned m. effective barrier

to the passage? of flames throughout the 1 hr test durations.

Th# limiting tempera tor*e rise of 250 ®F at any thermocouple,

except those on the Joint meaners, wes reaclis^d in from 12.6

to 16.2 min, for the various specimens.

.ilnce the members across ths tops of the specimens

were covered with piaster » in order to seal the Joints mtumm

specimens aM furnace fr#mo, it is practical to

coMparisens between the alternate details represented by the

two proposals. However, even if the piaster' seal had been

omitted, comparison would -not he prmctic&I boceuso the behavior

near tlxm edges of fire test sfecimens is ignored as a matter

of the standard test n^thod.

FP3559
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Figure 3. -i^|.ossd surface after test- klki spacimeus

I5 aM 3' from rigkt to left* the surface

of specis!j©n..3 spalled earlF" ij'i test.

fJae cracks in s;pael^a» 1 2 developed

during cooling and did not extend tiu^'ough

to tli« uaaxpoaed surface. •.,. .

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