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NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

7» 1955

A ¥MiLom

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l»eld^ i>* u* Ac^mi^-mh.

limiting «4 Air Cmdlthming

buildlni! UiviBian

to

Office 0jf Chief ef hfiglBeers

0f th# 4rs^^

WaaMUfioa, 0* C.

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

The publication, r

unless permission

25, D, C, Such pi

cally prepared If

A 1/^ 11’ 1 1 1 irin Udrii IS pronioiioQ Approved for public release by the . , ,

. ^ >tandards, Washington Director of the National Institute of .ep„„ has been spacifi- Standards and Technology (NIST) report for its own use, on October 9, 20 1 5.
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SUPFLMiKm’AJiY OM THE OF UKAtIfia AMD COGLIMO

A 01 LSimATE BSVBLOPE

by

w 3«ld«« D* C®1« a»d f«Rtl B. Aehenbaoh

1 . mBOBIKJTXOK

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In r«ftponae to th© requoat of tiue Offiee of Cidaf of

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.4 ^ Ei3 fin®«rs, D«part»s«nt of the tesy, m invoati^atloa ¥a* igade

Of the mineral ailaonit© ae an inauIatlOE mterfal for underground ateam pipe* operating at a pressure of 125 corresponding to a saturation temperature of 350F* fhe results

of that investigation were transmitted to the Office of the

'i . -a'-'

-' • • Chief of ^gineers ip a National Bureau of St&r'^darde Beport

Ko, 4231* %

IThis report suiM»arises additional infomatic^^ obtained

i. . .1.. V' after the first investigation, as a verification of tbe effect of eyclie heating and cooling on a CilstAlate envelope*

jIP'.U

ti Looie Type B Gllaulate from the same supply of material

w) 1: A

furniished for the earli-sr tests was po^ired around a one inch

black iron pipe centered lert^tliwise in a bos of

client-asbestos board. A copper-corns tentan themocoi^e of

no* 24 wire was p&med into tlis pipe about three Inches

from the outlet end of the box, ai'id a preSii'aa:e gage was

attached to ihe line downstream fro2^s the themocouple and

ahead of a cut-off valve* The oUier mid of the pip# was

connected to a source of steam*
urn mt lo

mQjsmm m^m^to a

s:d

£^^4a&d&A ,H Iml. hm stXoD *0. a

to ti^ldO Biif ‘io to osi4 o$ #S£ia;|4»^ £jI

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B%&mi at 3?T1% as ©easui’^NJ with, th« ioatallad thenaooouple^, was passed through the pipe embedded in the loose

Gilsul&te for l/2 hours to provide initial consolidation*

At the ©lid of the ij l/2 hours, an exaisiination of a sarisll

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, section of pipe and insulation at the outlet end showed a

very thin oonsolldated liquld-like layer adhering to the

pipe and about one inch thickness of material sintered

loosely together* fhe steais was turned off and the system

allowed to cool down nomally to room temperature* A

series of he&tlng and cooling cycles with stesis at a fcem-

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, viv .. .^.,. perature of 35^' followed the Initial heating at 3771'%

wltli an occasional inspection ©f the consolidated cor©

being ATiade near the outlet end of the pipe just foe,for®

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' . the end of the heating period*

^ mMxm FEiaoo wmadf-

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3 6,*0 18.0 m

k 127.0 bi*o X08

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6 5.0 19 Ho

7 7.0 / Ho

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30*0 18.0 - Ho

10 5-^ 4« Yes

The inspection following cycle 1 sliowed a softening of

• •r- • *' the sintered part of the core to a sponge-like consistency

with a tliln soft viscous consolidated layer near the pipe*
&& 00I &4^ nl P4^tq r^d-f 4,yi^c/idf MsA^tiq BJiw ,s^iqi.-oo

, r. m 0Mv^x*?q o# sm>'c^ %\S. ^

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Tto© inspection Owing oyela I4 w«« in tiio partsf ( 1 ) inspeotlon

after 60 tio^xps ©f heating, showed n harder sintered oore,

with leas iriaooua iwaterial at the pipe and more solid consolidation thar> before, and ( 2 ) at the end of 12? hows

inspection showed mme 'visoous material at the bottom of

the pipe with none on the top half and an increa.^e in the

average aim at the sintered core*

The inapeetlon after 10 is Illustrated with Fl$*

1 and Fif, 2* Fl^.* 1 a^owa the eliitered core after the

r-eiTiOval of the unconsolidated material and reveals a large

longitudinal creek on tiie top. Fig. 2 shows that the

sintered materiel omm off the top half in well-defined

piece# of eoke-like ariaterlal and m to the

pipe, Ihe lower half of the core oonsisted of a sintered

outside layer sind an Inner layer ©f a stiff gummy consolidated material adlierlng to the pipe* The adhealon e&n

he seen below the oenter line of the pipe in Fig, 2,

lu COIIOLMIOII

Repeated heating and eoolinig of the aiXsulat© conduit

for a cuMUlafcivo heating period of 203 hours showed dl,fferent

results at the top and hottmi of the pipe. Ihe top half

al'Aowed nuiserou# thin cracks that did not heal upon reheating.

The ioaid© surface %m» hard and free from the pipe, fh©

lower half of the core adhered to the pip© after 20j hours

of heating witii some of the consolidated. layer beinf^ softened
I

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to 9k vi&ooxLSi Gon*ln%mQ7 *t a pip« t«J^er-ature of

350^^'* cracking tl'ia .aovalop# «nd th« fractur« or

Keif ta® )3iat«ri&X iat© coka-lik# luMp« aijfillar "to tliatf' re-'^

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ported for th® earlier Inveatlgatiooe;'

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