NATIONAL BUREAU OF STANDARDS REPORT

CCLEKAK IH\TERTSD LAKTER-^S

by

Selden R. Cole

Heating and *iir Conditioning Section

Building Technology Division

for

Office of the Quartenuaster General

CopartiTient of the Anuy

NBS PROJECT NBS REPORT

1003«20-4?^3i? August 12, 1953

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

The publication, i

unless permission 25.D.C, Suchp

cally prepared If

Approved for public release by the

Director of the National Institute of

Standards and Technology (NIST)

on October 9, 2015.

jr In part, Is prohibited

Standards, Washington

report has been speclflreport for Its own use,

j . iBmmmnm

In with a, ^rlcina^iBg mt t

m% Ju}.y ®f T^pr^mntMtiym #i' tb# Offia# of -felso s?is#t#r f5#n#r%X, i.h« C.ospaifiyj ?ia4 tho Boroau

of a«l<litioual tmtu w#.r^ ism^# of ^ mw inmrtm4

Imtm^ efco t0ltirii:ii aii4 of OTi® of

f?rtvio«3 up#eimont aftor It t© tbo

oiia.ra«t#r!isties at mm^l mhi^nt .&iitl at m ^Mmfe

of i|f^ f# T^=« is

.Imtarna w^rm eai’idltlos# &ir

flowing thf^ufh tho fta«1 •maiarisf: orifiea®- fliis rop^rt sur^

th# froXip|r,js,r7 report tc; tht Oftlm of

tfct «ar?>#3«st#r 4at@ of 4uif Ik^ 1953-

H. Ts^vf * ^^11 Fa'^cfyimf

T®ig.p«grattjr^#, md Imim^itf wor«

with th# 0miipmmt ^^mmrtWA tn tho p'mliM.im^ry rtport^

«ae#pt that tha raatolipo tmsp^mtum in tho tmnk mu ss^ftssro^

with a tborm©eoi4wlo in m te#rsioB wall attaohtd to th#

l?a»©ltri« filler mp*

"t'm lantartii ^#rt In this ©f tost a • Aim

Imtmm nm ^ ntw tiy th® msufa®t»^.r#.r*s

reprat#atatl ¥0 i#il# tha -other va^ on#

Imt m’Brhml^-4 hy t.h# rtpr^s^wt-stive* thl^

latter the o#r^?s,ie mm%l^ htflMr

A new ‘sne hsYinf tlightly .larger .tn4 tralfomly )-iol®a,

the ganarator rtplaetd with a trsiriou-sly «a#i? mw wf ,ioh

had oist with ^o«|jr#-gat€ %l.r6 tj> oririoe-closiving

a«#<:U# from another ^trratnr ma substituted far tt*® orlgiuai

needle.

The Ifsnterns wer# tested ^tfe ^ full t^?^k of

the Initial starting for eath operation ar.d a pra^-aur^ of

30 poig m.B appiiad to the tank with th^j air pimp^ aftar

li^htlug#

m. ’""'f?

Tha n#iw lantern > when cparatoi in a roos,. whtr® f^-e «:’n,bieut

Inorr^sed grndiislly fras thh5 to 93*>'' F ovar a

four^hour rerlod, burned with a ta,nk Tsarfitig, o€t«#«a

14 p4iig[ r.-axi»uP and tit relfi '^it^.im.’m and with f«#l t«i?p«ratur«#

iti the 'tank varynaat between 1

55'' end 179'^ f followin.- the
fM^v *3® ^'>5''i-.' '-'

^«^.-";<‘.if!3j: i^'m ^ 'ir* r^ hi.-: Hii ,tnn(^bm^- ’S^a

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ftis i- f’\$ '

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X^jsi^W »4^ %^'i ^k^srJVJ'»i inam *-vf ir-..i*-?i?'til A<yt1

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’ ;i2^iw'b2li A- b£iB :r5A.r‘ M

X i ’»fVi to«« Ari -‘?t>-«‘' •:'f'"'tr! 5X ’*' ' »i-
ehanges In tank Th« lU}*f!n©w!ity fro® 100

to 155 whon orlfleo cl«.imod one# an ho'or,

v^Jw« of 155 candl«pow#r wa# r#eord#4 on» honr aft<^r

atartliif tb« ,lant#rn> aft®r which the lni?i5.i>oalty hooaaio fairly

steady at 100 to 115 eandlepower.

The same lantern, when placed on a tahl# in a roois therm-’

statically tontrcJJi.ed at a temperature h^xnmn %n4 13--'' I- and st4rt€!4 mdmr these conditions^ had a fnel temperator# in the tank, within o3se hour, of 197®' hfter the first

hour, the tank pressure varied between and 39 p^ig -and the

Imlnosity hot, ween 50 and candlepower. At on# time the tank

f

reseure' dropped to peig with & drop In tank temperature and

u^s-timsity hut imereaaed aftar cleaning the orifice

with the orifice-cli^aRinil needle*

The rebuilt Ximtem contal.ni.eg th«s prossore-regul.atln^*

v^slve ue^^d In the earlier te.sts um allowed to bum In an

arabient tempersttMre^'kpproxisij§!.tely 90^' F for tK«o hours, after

this time, it m^u piaceci in the hat rmm with tho new lantern

for the neict three tiours At XM" to mbimit tetsperatsire.

The tank pressure inoraased frojti l6 to 36 psig ai'*d th© candlepower *“ro4fi SO to 130 in th# next 25 minutes# huring tht suc«*

ceeding hour, the presour# bad again r#ach#d l6 ,paig w.lth a

correspoading drop^ in eitndlepower to 35, For th# rmmltiCer of

the teat, the pressure did txeeed l€ palp, and the c<an41«-

power did not emmd 40* Orifice cleaning failed to pemanently

incresat caitdlofot^er*

"^h# pmsiur^^-refuJatlnf wlv# wva .removed fron the new

l&ntem and placed in the old lantern, kt au ai^iant t##«pcratur# of 135^* F, th^ tank prmmre leveled off at 3X.5 p^ig and

the lufdnosity vsaa steady 90 candl.epo%mr» A uocond old

pr#:ssur#-r«fulatimg valve that tm4 nt% bean used in any

test run at tills Bureau was placed in tbo new lantern, '^-ith

this r#ful atIn- mlve, the pressure v#ri«^d between 26 and 35

pslc mt” an mbient ter^pereture of 135'' f* th® candlsp^^^mr

v*5rl#d frm>. 40 to 70, ?&ois#ntarily Incroasinr wiien th«5 orifice

was cleaned 'with th^ orifice clf'-aner. Them two lanterns were

then placed in closed not larger than the

lan.t#rns but with access for combustion air. In 15 s^inute;®.

the pr#9?sure in th® ^i'a-soline tauk c.f th*;? new lantern with the

old valve was 43 psig, whereas the pressure In the old lajitern

with thfi r.#w valve was pslg and still Incn^asing. At this

tlisie, both lanterns mrm remv%4 rro«* the teat ecvipart.&©ntft

and the rress^rr ^radu^^Ily stisrt^d t*-? down* Therrncaut'le

iseasorefsr.ent s inditatf-d that th# ter-rrjeratxir© in thj# compel-tment

a

was about 160" f at tt# #nd of tV# period.
v^i|fc#XSi }?j;w f '1:^; ©it

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i>4xy/. / .. r . ,/ ,-. 3 ^ tw '^Yav?

^mS
3'

; of th# thr®« pr©saur<a-^regula.tifi^

valw® to d^tersdne %hm of th# tu(3l^tm%&ring ^sriflee

tho of th«. Mil, that jsXld^s int© It nihm th<s

Mtik ffm nm vmlv© md the ¥aive not

previously um4. bad th«f nm% s^®a2iuras«&«ts of ^'5*D40«il^. ball

cSlafeetftr md 0*0415-4r* orlfic® dla,rft#t^r whi»^r«as vitlv«

ustd In prtvlous t#sto md a ball and ©rifle® m

Tjtarlf the mm^ tMtt thtj fQrmd a eloaur®

whm lb# %mik prmmrm Isertasad*

K^&sursmnta mm -^Im mad© of tho trawl of tht stau

of th® threo ^ross«rff-rojpilatlti^ valvoa differ«st pr*sa*-

m^rm' applied to th# Mllowa ^ImmXf in a i$i.m>-

latlrr?: task rr«?asure dx.tritr mr%ml tb# r^-sults

of theao tents are in tabi# 1*

fE$f^ Cf fESbdllEEI're-a^ttro

appHiSi! to

b®-,llo¥a

t Trawl of vaivii' tl-.o«isandtbii lat^h

# Old valw ite> 1 vaXv#

t pressure braJsssMT'S- ’ Mner&at-- Increas- ^‘laereasiii,#^ ^cres’dnr

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10 13 - 14 5 1/2 ^ 2 14

35 * 16 17 1? * 2 1/a 17

40 * IS 20 10 3 21

50 t m as

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’ 2? : 60 tr S9 ?

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ffca valva sto^aa In tbt nmi valve m€ the ^jld vaiva not

visusly f?b-, 2J tmly ®Xi:'hi fetav^js^ant u;-.tii u critical ascfiRdins? pressure of 3§ to 45 psjlj: reacted at ^d let

proosuro t'"c valve a tera aoved tOi^arl a eieaad posit3 vr with

a anap actfoil* Ca doaovndiR'. fr«;.««iu.re, thia an&r action took

rlaco bf-&r 30 jitirf or. tbo nvw Val.w» did valve bo* 1 under the

saw# to«5t condition's a steady Boveieant of t'ru? valve *5tot,

on both asee^nHit^ arui pressures frois. 0 to 60j»ir.*
'f»#v? -*5 ^ tf>^ o.t i,mim

^--'v? ^;i 44^i "»:; *t®'4‘^vfyft.it!' 0^-t t-..;£

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4 44;»: “V •.. j ;^‘' ?*?; -” * ,' ; iiif'Vt- -J^ .'<^h<;b.^ 4;? 0
vh# mmp isk q£ wm at?*rllmt«4 tc litiekins 30P«e part of .tho .oi«<jhar!l5sai h^tlx %hm Bpring

''mll&m in. thm^ v&lv«?s swis&lly |>r©4u<s© a

raov«£a«r?t of tfe<f ^‘iXm n%mm c%mgm in prmmwc^. ptiekin®»» in tim operation o.f |^r<ieasuf’#»r«fc,,t4latliiS iralv^a 'lO&uli

ca«.^e irarl«ti<»ni» in th« «p«rAtins of a un4er

otnor'wi^e dlMijur aonclitioiiji*

. ft, Th« Iow«r «i»d of b^iis ou Vm mid of tho

Tnlv® nttmn of the thr«« pro4#ot«d frosa 0*0.355

Q»0$i imh tiirouf$h. orifio#a* th0

sphm-'i^^l mid^ 'mm ft'boiit '?*040 inch in 4is®«t«r, a

tmml of 0*0 to 0»0X4 Incn wsmi4 restriction of tho fual-*EiOt;r^.rlng orlficd^

It 1?^ t^lloyed that th« ob-s#r*T®d variatisE# in the

traireX with pr#s#nrt an4 th# dll'I'ererioe^ in sX##aranc#

hotwcun %\m sphcsrls.il hiilli -a-Ei thm ^rlftmu mmnd th# miriM*-

tion^ in operating prmmm ^hsmmd wh-tn. th# threo ralrta

«.sed %n. th^ l.^nt#rns ihirin-f thast t#st3s* In particular

,

th« amll ciearaiiS# featwncp hall and orifice for ol4 riklm

1 md the t.mrlier eto$.tim th# fimi*-mt0ring orifim with

rim la pras^aur# probably ascoantad for %h% lower ©pcrating

proasare and low^r Itetraosity oba#rvcd this ml^e miS umd*

fo ta^to were isade at low aK?biopt tmmrsitum during this

series*

x¥, mmnmim

This series of teets of om siew and one old specisieR of

th# inrs^rt^d lantern indicatcfd the fal lowing sonclusienas

1. thm pressure^refulatlng dsvieoa liMitiid tht pres*^

sures satisfactorily it* ambient tessperati^aa froai ^0" to 135 1-

2, The lanteraa ahOMid not fee ns#4 where the heat tai^rot

readily be dissipated* In confined pp^ee®, the hat fro®

the lantern cm heat the tml taiik excessively anti produce

prer-3tir?^a tfest thm rtll^f deYite carr^ot compaTisate for. The

preasarea developed in th^ tarik when lanterns were operated

In e small co^nartisi^nt during this mrim of ttsta indicated

that excessive self-heat In,^ of the lantern# cauaed the high

observes??! durlnr the cjtrlier terl<?a of teat# th^

lantern# were operated in th# aame eompartiaenta*
!f:.r ;^:-v,-; "1-

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^ i'^‘S ,S’ iX-.-l:: -^T i si'.ic'':-;' !-.;''3,'J;'''i>5 ff"'; I'l.;* jtJSt.jwt
3. The preaaure regul^itlng V4lirf ia one of tl^0 i&or<?

important pomponents of th& laniom thi^t setert&ines whether

or not 5t» operatioR will be satisfactory* Therofora, ©very

effort shoutil to attain ^od quality eoiitrol or this

device with reapect to clearance h^tmon spherical portion

of valve stesf. and orifice, pressure of the valve,

freedom, of issotieia of bello^m and spring, and projeotlors of

valve eteu'i tJ-irongh the fu-eX~s5iCter;ir*g oHfiee* 4 difference

of 0*0015 inch between th® diaisietera of the spherical tip

and the f«el-^seterl.njr orifice appeared to provide good operation durinr the teats Kade here.

4 * Eesular and freq^^^nt use of the orlfica cleaner

wl-ll- he necesaary to maintain a good lamiBOsity with the inverted lantern.

I!' U ’

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