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NATIONAL BUREAU OF STANDARDS REPORT ... v/\ U--.>,'Cr.q\ NATIONALBUREAUOFSTANDARDSREPORT NBSPROJECT 1002-30-10627 May18 1962 NBSREPORT 7509 FIREENDURANCETEST of TWOBULKHEADASSEMBLIES

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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

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    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 effse- iirs 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* nomine 1 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#2 f 1, Jf/il4.$0lA3, xj/l

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    doming 1 oensitv . ....Length

    m actual 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 elearly 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 corres- ponding 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,

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    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 space- between 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-1empcra ttire 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 Putchi 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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