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NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT

1002-30-10627 May 18 , 1962

NBS REPORT

7509

FIRE ENDURANCE TEST

of

TWO BULKHEAD ASSEMBLIES

by

J. V. Ryan and E. W. Bender

for

U. S. COAST GUARD

(MPORTANT NOTICE

NATIONAL BUREAU OF STAND

intended for use within the Govi

to additional evaluation and revie

listing of this Report, either in w

the Office of the Director, Nation however, by the Government age

to reproduce additional copies fo

•ess accounting documents Approved for public release by the ^ P ublished ]t ls subjected

. . oduction, or open-literature

Director of the National Institute of is obtained in writing from Standards and Technology (NIST) h permission is not needed, on October 9, 2015.

,ared if that a6Mt, wishes

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

Wim T£3I

Of

ms soito mmtkxm

w

3* v. dyaa eng &* W* Bender

ABoTHaC?

two buX&heed assemblies wore subjected

to s standard fire test. 2fe» two differed

only in the nraalaal density of the ash* sto#

snrlae boards as«4» hash served a® an effseiirs barrier to fi&as &as*sug* for the full

40 sianies af the wit. •. iccssslv* fesaterature

risi: os reached on the mis&pcuMHl surface of

x. .. ainei |2 ifc |tf c, ft feeaN * and on ta* nomine1 3> lb yer on ft board at

17*0 silo.

1* Introduction

it the r&^uest of ,e&d^ttart#fa t

tJ. » Coast Guard

(ietttf of n arch I#2f 1, Jf/il4.$0lA3, xj/l<fc.d&$A9;

t¥o bulkhead specimens were subjected to fire test in

co.’.v*. iXanct. with Jufepart 16^*w3~X(b’ of Spaalfioation for

Bulkhead Fanils for 3#refeaat fsstals*

2* dpeejUswu

•-ash aseolfseh vas an assembly of two r laces of f/B in*

dfefat&isl; thick -.iariatte asbestos &arta* board, a saap—

together tsetal Joint leather} *stai channels rm the two

rortioal edges, amt -net#! base tethers end trim pieces.

The details ars sho^a in figure X at the end of this report*

The ^atarlal# mire receive* tbs Johns- -anvil 1* Jaap&ay

hat marked to ladicat# that toe serine boards had been

aeaufastored at Seraistoa, *eotlaa& by larialte, . td* the

parts, all y-rseut to sl*«f were raeelieA u&*s*aafel«" ! ; But

those for aae* s^eciaea tf*re individually vrs; red.

Th# two sgaeisiaas differed only ms to the nottin&l 4entities of the asbestos marine boards. &aeugfti pieces for

tm s^celftsfia were received in good condition, fos sure seats

made on each pices prior to assembly indicated the fallowing
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density

ib/fti —sir*— la* in* in* lb/ftd

32 30 94-7/8 16-15/16 *9ca 35-5

55 94-5/s 29-3A .931 36.2

36 30.5 94-15/16 36-31/32 .906 36.1

55 34 -31/32 29-3/4 *920 36*6

.lean of i to 5 measurements of length and width, 10 to 20

measurements of thickness.

In view of the unexpectedly high density of the nominal

32 lb board, samples vere cat froa meh specimen after the

fire test and their densities determined* the results failed

to el early indicate that the nominal 32 lb board had been

received with an abnormally high moisture content*

Data submitted by Johns- amville Company, on measurements

made prior to cutting and shipping the pieces of board te the

bureau, indicated "normal n and dry densities of 3k .

5

and

33,2 ib/ftd for the nominal 32 lb board and i 3

’ *2

34.9 lb/ftj for the nominal 36 lb board, the equilibrium

relative humidity and temperature of ‘the* attsoaphasra corresponding to normal were not identified* It appears logical to

expect that materials shipped by conventional transport would

be received in conditions more representative of normal than

of oven dry,

3 . lest dot-hod

the specimens were mounted in two openings of m test

frame arranged to permit the simultaneous fire exposure of

three bulkhead specimens in the wall test furnace, the thirc

opening was closed with an Insulated aetal panel. The spacebetween each vertical edge of each specimen and thv furnace

fra.se was filled with mineral wool) the miner*! wool and

metal edge channel were covered with a fill* ; ef plaster on

both the exposed and unexposed surfaces*
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Light thermocouples were placed on the unexposed. surface

of &ach specimen, distributee as shown in Figure 1, t'ach

thermocouple junction aaa several inches of its leal wires

were covered by a 6- by 6- by 0.4-in. felted asbestos fad,

Twelve thermocouples, encased in porcelain insulators and

iron pipes, were distributed within the furnace chamber.

The furnace fuel was gas fro® the local municipal supply.

The fuel flow was adjusted as necessary to produce average

furnace temperatures aa close as feasible to those of the

standard time-1 empcra t tire curve of a IT; 1-1X9* which include - 1000®F at 5 min, IJOO^F at 10 .©in, i5J»*F at 30 min, and

1?00«F at 1 hr.

4, Hesuits

The test was conducted on larch 16, 1962 and vm witnessed

by the following

t

Paul 01bs©a# USOti

Roger Hale, OcCO

Oeorge Put chi son, ari.aite Ltd** London, upland

IU 1. iatith

A. J . 3tenor!

Burt Tower

J. F. Lynch

H. A* fireehbow

So cracks developed through either spedmen during the

test. The joint members bowed slightly toward the fire in

the first few minutes but, after about 12 min, the joint

members and maria® boards bowed, away from the fir®. The test

was stopped, at 1 hr.

Both, specimens remained effective barriers to flame

passage throughout the test , there? being no cracks in the

unexposed surface, The limiting 250®T temperature rise

at om thersBbcouple on the unerased surface of the asbestos

marine board was reached at 17.3 minates for the nominal

32 lb per ca ft board specimen and at- 17.0 minutes for the

nominal 36 lb f®p eu ft board specimen* The fire exposure

severity for the 1 hr test was 93*2 per cent. Additional

temperature data are given in Figure 1. examination after

test showed that the base stools had not- been deformed. The

only metal deformations were sagging of the ceiling trim

members and some warping of the exposed surface plates of

the joint members.
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5. SaaBsary

The result* of the test lasttcatgd that both specimen^

served ms effective barriers to flame., passage for i^hr, arid,

that the limiting temperature rise was reached at l/.o min

for the particular samples of nominal 32 lb per cm ft arinlte

board and at 17.0 min for the rarticular samples of nominal

36 lb per ea ft -.ariftite board used in the specimens.

neither the contents of this report nor the fact that

the test was made at the National harean. of Staimar^s snail

be used for advertising or promotional prpses,

TCl0230-22'i FH3612
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FIG. I

-TEMPERATURE

DATA

AND

CONSTRUCTION

DETAILS