NATIONAL BUREAU OF STANDARDS REPORT

mz PROJECT

1002- 30-4877 June 2, 1959

MBS REPORT

6425

FIRE ENDURANCE TEST

OF

THREE BULKHEAD ASSEMBLIES

By

J. V- Ryan

for

U. S. COAST GUARD

IMPGHTANT NOTICE

U. S. DEPARTMENT OF COMMERCE

huwewer, by the Governmeji

to feproduco additional cop

NATIONAL BUREAU OF STANDARDS
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Tmm bulkhead assemblies were subjected to standard

lire test to determine their suitability for approval by the

J. &• Coast Guard for us« on vessels. -fwo of the bulkheads

had marine boards of the same thickness, but differed as to

joint member

s

% the third bulkhead had a different marine

board# Sack assembly was designed to allow for thermal expension# fh® three specialists remaim 1 effective barriers

to the passage of flames for the full bC*minute test period,

but- only mm satisfied the requirement that the unexposed

surface temperature remain within specified limits for over

1> minutes.

1# Introduction

at the request of the U* a. Coast Guard, (letter of

31 March 1959), three bulkhead assembly specimens were subjected to fire test In compliance with depart lbk#0ud-3(b)

of pacification for Bulkhead isaaals for Merchant Vessels.

2* lest pseins&s

Ha* speclmeas were submitted by, and shipped from, the

Nippon asbestos Co#, ^td. , iokyo, Japan, the specimens and

shipping container were received in .good condition# the

specimens were labeled as fallows* (1) Marine Board lOo-i,

Joint iype i, (2) Marine Board 10G-< : , Joint Type 1, (3)

Marias Board ob-w. they were received assembled and ready

wo momt in the furnace test frame* -therefore, the details

given in the Cigars at the end of this report are based primarily on examination after test.

inch specimen consisted of two pieces of marine board

with a vertical joint member, all mounted in a frame# Xhe

frame m& joint members mm of steel, were pointed, and

were designed to allow for thermal expansion* Tm marine

boaras 'were hard, white, smootk-finished, and appeared to be

of cement-asbestos types. For further details see the figure*

ho extra samples of materials were received upon which auxiliary

tests could be made.
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ihc specimens mm mounted in the three openings of a

test Ixm® modified to permit the simultaneous fire exposure

of op to three specimens in the wail test twmmm* lack

opening is about § ft it in* high and 4 ft Z in* wide* Care

\tm taken that $mh tsgmimn frame wm restrained against

vertical expansion or movement , so that the only relief for

to thermal expansion would be that provided by the design

and fabrication of to specimen* Sight thermocouples were

placed on the mmzpomd surface of each speelauu distribute!

as 8^d«@ la the figure* ^b© Junction and several inches of

the vires of mmh thermoeoui&e wer^ covered by a o~ by 6- by

*4 in. felted asbestos pad* twa&y* toraooouples, encased

in pofoelain insulators and iron pipes* were distributed

within the furnace chamber* ibe furnace fires mm eontrolled

to produce average fwem&m temperatures as close as feasible

to those of to standard tto~ta®perature curve of XSB'. "119,

which Includes 1000*f at 5 ala* 1J403F at 10 »int lyfQaF at

30 sin* and X7DQ*$r' at 1 hr* Xhis curve is to "reference

Curve 0 in the figure#

0* Arndt*

to fire test# conducted on Pay 1% 19$9f was witnessed

by it Bui% -JOOG j Washington g| f o. C*, -sad personnel of to

t&tional bureau of -Standards) Fire Protection Section-* By

5 sin the exposed surface plates of to Joint members were

buckled^ the paint was burned off, and the- paint on the m~

exposed surface was darkened* By lb min similar buckles had

developed in the unexposed suorfame plates of the Joint members

at a few locations* By 40 min the unrxpose-i surfaces of the

maria® boards had changed from whit# to m4Xw& gray, the 100-#'

sasre so than the 60~B* ilso, the cores of the Joint members

war® bright red at five locations where the unexposef surface

plates mm buckled away from the core* Tii# test was stopped

at I hr* Ihore had Men no evidence of cracking of the marine

boards at any time during the test-*;

to maximum deflection of to iob-P spec ton with Joint

was *2p in# | of that with Joint B wm *h ia*$ oad of the 6Q~r

specimen was 1*3 in* Flames did not pass through any of the

specimens* to fire exposure severity was 19*4 percent*
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