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Corrosion Investigation Domestic Hot Water Tanks
NATIONAL RESEARCH COUNCf L OF CANADA D I V I S I O N OF B U I L D I N G RESEARCH
CORROSION INVESTIGATION DOhESTIC HOT FdATER TANKS
(prepared goor
the Central Mortgage end Housing ~ o r p o r a t i o n )
O t t a w a
F o l l o w i ~ tha p m f i c a i ~ r y invecltigptiona which wepe ccn- ductad i n t o Lhe premature l o t l u m of dom@stio hot wotrr tanka and
~ p o ~ t a d t4 C.f..u.C.
in
D.8.R. ;cq?ortH11,
dated BayX9,
191~9~
o t e a t p r o s a m ram prepared t o tnr.ati(;atein
~ O F B d e t a i l the aau.*a or P a I l w .In
addition t oidr.
f . Ashrta~ldof
C.P.N.C., w e hav.b.en
a r l l a t e d byDr. M.
Cohen end hls ~ t a f f , igr. J . 2 . J . Thanvas, aowell
a r repressntat3vss o f tha H.P.P.C. o f C m t a ~ l n . Utterproi:loa and o w proireat h&r b a n ;,ltrrnjsd t o a u ; ~ ~ l a m n t that
of
Slnoe
w o t w %a tho 0h1aff a o t o r
involved i ntha
proasus of oorroslon and, beoauss i t v a r L a ~in
ctucaotsr fraea pisee to p l a c e , rxperirsientrl work muat bo c ~ a r ~ l e d o u tin
lo~crl2tie. rspruaenting' ~ e a u m
@ome
or L ~ Q I Cuc~t;ors inroloerdln
%ha ssr~oaPsrsof
hotooisplet8 bank insta11PtLon ~ h o u l d it. coneidomd a sttrnpb Por t e s t
auoh a s haotora, pi;?iry; and i n s u l n t l o n
in
e l % a m p o r o t l v s as,-.alef , C a % p v i r ! l t ? ~ @ r l t a 3f c8n'oaion of' ~ ~ i v l ~ n % a d d t frka
in
v,ariouo d i ~ t r l c t o of Cmocla
.
. Tha e f f e c t af tmpar.tturne upon &ha
a e r
o f c o m e i o n .3 .
The a f t e o toi"
tRe
vrrfsblao
involwed
i n fabric-ationW b f
a1 tanka,
irran$:;w#nt&
h e r o bi;mma.
k yufobe.40
epaaial ii;cdrau n i t a , J a a l g n ~ t e d
-
O>O-fb, falrioa%wlunder
s
apaeificatlon ~ n dir.amcted
bythe
!I .nrP.C. f ~ l t i ~ i ~ . 'Phoywill
ot, agu5pp.d withFor
the
first
y w r a t f.arat ttis
prpposd to csciflnraur
Irrvs:iti~rtirha t ofour
d i r t s l c t a i ai n t y r i o
~ n d t o i n c s t ~ r l l 10 ofi t ;
is
P ~ E G
L h e ?It %a fiat &dtpimbLe ba Lin5tifa$e % h i 8WOULJ nay F Q ~ i n a t
~ ' i $ t ? t ~ f I " ~ . ;o#f8+? ~ 3 3 " f i . $ : : : " ' i ? y f u b ~ P 1 ~ ; s ~ Q u E J . ' j f ~ !,a$@ ~fj:ecF; ~ ! ' B c ! t @ l . . ; ~ , a L & 3 f~'bjki','lrQ
b"r&"t!38 1 *:9t :.dtr:'? t f o ~ t%er'm -;t;..Rt :ir:Et$;; , :Q f:fx@d
fox* t . ~ r
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t k e &ssS, 130 ).:c sfrg3~li.f i,m %n!it~tw~CEctrf~:cl&
r a t * r :).eter i s ; l l . t i i f 3:; %!-:a 9::3',~?61 f,sr a:x~~erL:atstt~~taj pic,, &:;ti ' A
t;.a;.e .?.i! , a -13 2
i ? i ~ i o n : a l
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,.:3~:1. :taa,y SQ1 :uis r . ~ l o t.9 .:awe M s i ;>ri ~ r h t e - i i arid 7l;co~J.
:n
s l t h u : . l t inLorai:.r - -,t:?e tiln:in t t h a t it f s
i n
expariaeat n 1, or, it. f t:
s ildv',aable to ?ut a l l experinnr~: .,i w l ts sf o ~ i e loc;ll i t y i t . : .w:..ruicsr .ibout t h e&mfr t i ~ f ! (:33 l o r : ? thd.-r one ~33- & h i 0 *i2aq;tfrs a p a r t ) to elirol,4a&c
f ~ c t a r o f t h s s&~k%;0r:41 @ ~ L T ; . eg $L teh ewake:.
, f'tar t h e ctpcr.r*ben tr l w i t s arps inst,:$ lled, and ~ e f a r e
tl.:ey i ~ r e .;)lacad i n rsurwfce, it i i i l . ~ c ncc.-sa-ary far a r r ~ > ; u b r ! . t - 3 -
t i v ~ of the
.
."
.
to i u p e e t t h a !r,titJ*llztion and check the tm-pw.-i.ttJrr s e t t i r ! , :
or
tho t h e n a g s t i t . It 1s i , i ; ~ i l t ~ t i i j tkmt every 3P.r:nilr:t:~s i rr~3rAeier.tativtb !sf
$'.re
;.
4 ..
will wbksrouti!&e
i ~ s ; - t e t c t l ~ r iof
t h U Y ; ~ t ~ . 4.s 81$,.1L:1$.i<3;cp t h a t :ji.+aciui @x;mf : ; a t i . a i i -3lthe
$.~:'~9i.saay oe dons i n ~ o l v t n ; ~
x - r q
;4mt.;a;;r .q;tly. :iat+e of t h e s e u t ~ i t ~ guy be rroziovud before t ? : r y f d i i , I.@., hrt t h r @nd q f say 1Jr
.'
yea:-$*survi.ci?. ~ i l u r l i t s on it:svin,; f . r i l a d w 4 . i ~ recaveit ;lad t w i t to
..+. '
.
.
,
t t a w - l , i'3r cfstai 3 cd era-1. iatiol.,.TF,I 3 -:raa..P:*:i
of
r o s a-
ck i a L:;tartded t o ~ u r ; p l o . ~ e : l t irlvwsti-37:$t:3?. lin,,I@r '&? ZiQK s $ r d ::2t to su&t:fut& i c e . ark aLra;rrij' 2 % h l m t &
i ~ v o l ~ t i l t!ie oss:ul;;at&~~ by ... 4.
.
~ n L i I: i v i s i ~ : . : ~f :! apii:a,A :ip-+c+i :%trjl,,
r:f t ? + i n l . ~ i.;l-,lch hpwa f ;sii.od I!: ~ ~ . c r v i ~ @ at i:. ' .i; .C. r e : ~ t ~ i ,, rs5j::ct3.
't ccL3*"p ..i ra+.. I CO 0xL3tir: trrar:csroent, , ?
,...
"I ii:.:. retpfonal ~rf'icc..+:;Tho ? typos o f expiarimatlt:il i n s t a l l a t i o n s .zro reitrasanted
or8
schoni%ttc drai,;liii:s-
''tlLt
m d 3b, r.r 5yatsrr.aI
n;& 1, i,
s t a l l e d should have the f
ollowingv
1. r i ~ 4 heruaea flaviif;: .3pstm I i n a t i l l l a t f o c s kith therro- & t a t s s e t a t
135
P.3 .
Thraehouses
havhnp, i y a t r ~ a;I
irr3t,dlLatlor1$with
t h o m e stat3 s e t at165
P ,Thus i t i s plaa~red t a have a total o f 13 SzlstallaGioiis
useJ w l i l ou83pliad arr orrt1it:ed buforo. r'ar case 3 i t i n
sue-
,::nated %&\at c?~wwrcielly o v - 9 i l n b l e t a n k s de purcheloed i0c~h1i.y and
roprasent a : i t ~lldibrd
aysem
confomin!;
w i t hlocal practice,
nr;dhavin:;, i n s [ l i t i r m , :r -7;etcr and a a3xic!lwr. Ir~riicatins theraoadttjr