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NATIONAL BUREAU OF STANDARDS REPORTNBS PROJECT NBS REPORT
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IMPORTANT NOTICE
NATIONAL BUREAU OF STAF
intended for use within the Gc
to additional evaluation and rev
listing of this Report, either in
the Office of the Director, Nati(
however, by the Government af
to reproduce additional copies
gress accounting documents
Approved for public release by the alb Published it is subjected
, XT • • r production, or open-iiterature
Director of the National Institute of n is obtained in writing from
Standards and Technology (NIST) ich permission is not needed,
on October 9, 2015.
U. S. DEPARTMENT OF COMMERCE
NATIONAL BUREAU OF STANDARDS
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bulkhead assemblies were gub4#etsd toa standard fire test# The two differed as tothickness of marine board itnd joint details*B.ach served as a barrier to flam© p-assage fortlw rt^ulr@4 SO min, but neither prevented ©ex-
cessive temperature rise on the unexposed sur-face wlthiii the initial min*
1* Introduction
At the request of the d* S. Coast Guard (letter of16 January I%2, 2C4t, JJ/l6^*00SAi), two bulkhead speeimoaswere subjected to fire test- la eomplisaco with Suhparti6^.00S-3(b; of Specifications for Bulkhead famia for^lerchant ¥©ssei$.
2. Test w^pcclmeast
The specimens were submitted by the Jaisa Asbestos andRubber Company*- The mat«sriais were delivered to the SatioaalBureau of Btaadards where they were assembled by representa-tives of the submitter* .Each speciaen, when assembled, con-sisted of tw© pieces of Inarcohoiprd 36 with'h vertical Jointbetween, a metal Joint meitaber system, mms a metal frame* Thevertical edges of the mriae boards were sanded to a slighttaper to prevent a binding fit in the metal components*details of the assemblies are shown in Figure 1*
.measurements made on each piece of the marine boardwhen received indicated the followings
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3 .^. 96-1/16 29-15/16 .740 3S.6
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5 96 29-31/32 .869 36.3
6 96-1/32 30-1/32 * 866 37.4
96-1/32 30-1/32 .869 36.2
a 95-31/32 29-31/32 .865 36.S
Leagtii aad .wldtM average of 5 a^easurfeaeats to nearest1/32 in., taiekn^es average of 15 aieroiaater readings.
Pieces i''‘enfil 5 were used in tha wldtli received | pieces3 and 7 were cut to 17-lA in. width. The mmTlm boards werewhite and moderately hard.
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The speciffteas were mounted «: in two opeaiiigs of a test fraiaearranged to perrslt the siaultaneous fir© exposure of threebulkheads in the test furnace, fh# third opeiiiEg wasfilled with an insulated me tai'- panel.
Care was taken that each specimen was restraiae4 againstvertical movement, so that the only relief from thermsl expan-sion would be that provided for in the design and fabricationof th© speclaeas. -
. Tii© peripheral joints between the franc ofeach specimen and the test frame opening were sealed with afillet of piasUx. This plaster fillet coYered ail metal onthe exposed surface except the vertical ioiat memhet betweenthe two pieces of tfnarceboard 36 .
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Eight thesrmocouples were placed on the imexposed surfaceof each specimen, distributed as shoim in Figure X, Eachthermocouple Junction and several inches of its lead Viires
were covered by a 6^* by 6- by 0.4**ln* felted asbestos pad.i'weive thermoGoupies, encased in porcelain insulators andIron, piiies, were distributed within the furnace chasiber.The furnac© fires were controlled to produce average furnacetemperatures as close as feasible to those of the standardtime-teiHperature carve of 4SfM E-Ilf, which includes 1000at 5 siin, 1300®F at 10 sd.n, at 30 min and 1700^F at1 hr.
h. Hesuits
The test was conducted on February 15, 196-2 and witnessedby tli© followings
Paul c1-ibson, USCuDavid J. Lime, 03CGW. K. Dempsey, MAA . M * i^Qompt@
L. hanbury, FFC
1. h. ffaender, TJnion Asbes.Co.W. f. Glnciair,A. ¥. 3u«ersa. WildeA. F. Buquor, Martin Parry Co.
Throughout the test, the flames In the furnace were luminous and well distributed. The first cracks, observed at28 min, were across tha botto® corners of the wide piece of7/8 in. -thick board. By 31 iiiin, there were iia,tehiiig crackson the unexposed and exposed surfaces, but the former werevery fine and remined so for the rest of the test. Therewere no further changes and, the test was stopped after the60-mlaute temperature readings.
Both specliaens continued as satisfactory barriers toflame passage throughout the 1-lir test, there having beeno.nly two hairline cracks in the 7/8-in. thick specimen andnone in the 3/k-in. thick speci,men. The liraitlag temperaturerise of 250®F, at ai3y thermocouple o,n tha unexposed surfaceof the mari.ne board, was reached at IQ. 2 mimtes for the3/4-in. board and at 13. v minutes for the //3^in. board. Thefire exposure severity was 100.2 percent. Additional tem-perature dat-a are represented in Figure 1.
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5- Summaiy
The results of the test indicateda^e^berrier
r-artlcular speciraens tested was a satisfaetor/ ilaSie Darner
lironftoul bit that the inciting
ranched at l^.2^ain for the 3A-in. board and at i, .3,/. _; ,4a
for tiie 7/8-in. board.^
NeithSr the contents of tMs report
the tests were aade at the flationai bureau of ot^andaros snail
be- used for advertising or promotioxiax purposes.
For the Director.o
by
A. F. Bober tson. ChiefFire Hesearch Section
TG 10230-21 5 FR3611i%rch 12 , 1962J, V. Ryan
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