Interim Progress Report: Corrosion of Domestic Hot Water Tanks

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This report gives thm rtatur of progrerr on the investigation of oorrorion of doznsstio

water rtorage tanka, It Pegrsran6r a r w y

of the s a l i e n t features o f an extenmive l i t e r a -

t u ~ e aurvey ar well a r dimouarionr withg

Afmaara. B o C. ROBS, W, VoZhnan, R o

F.

Walker, of the Ontario Hydro E l e c t r i a Power Commir- .ion$ and Dr. R e R e R o g o ~ ~ and I&, J o

Fo

3, Thomas, of the Bureau of Minatrj to whom the

author i s indebted. A number of reoosmenclationr are given as a ~ e o u L t o f the inveetigation.

Gomraenta and ruggsrtionr on any pointr rairad are invited from a l l Intereats8 parties.

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m a fo1larin.g were the rim8 of t b grelimtrmq rumeyjrt- (1) To ertablish the chief b a ~ b o r r oontributing

t o the

p ~ a s e n t f a i l u r e s with the view of oontaolling these,

( 8 ) To arteblloh the baokgreund for a a e t a i l s d obudy o f the aaurer and preveiltfon of oorrorion In order t o Oevelop a sowid baeis for future %nrOaklat%onr, Faatorr Governina Corrorion

Factors poverning Corrosion of ho-t; water tanks can be rub- dlvided into two main olaoaert-

1, Internmlr-

( a ) Preparation of the brrs metal.

(b) C o ~ ~ p o ~ l t i o n of the sine rpelter.

( a ) Temprature of bath, t i m e , of dipping and

rate of' withdrawal, 8,

Externalt-

(a] Characterirtdaa o f the mter supply.

(b) Temperature of the watsr ~ u p p l y on8 rats of heating.

( c ) Preosure and flow variations, ( d ) Galvanic aoupler.

The internal factors deal with the g a l v a ~ l c i n e ; proesrr and a dirousslen o f the iaatorr 1irked 1 8 oovered in the l i t e r a t u r e

) ( ) ( 1 ] ( 1 4 1 5 )

It

i a pointed out l a the literature men- tioned that there factore a f f e o t the q u a l i t y o f the end product ~ o r ~ i d e r a b l y ,

Ths influonoe of t h e e r t a ~ n a l f a c t o r s 18 varied bsaauro t b oharacterirtics of the water. supply vary from p l a a e t o p l a w ,

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b r t a l l e d t o dearaara tho i a t a of

Slow

and g r e r s w e ahanger and afford, tha urb of a

amllar

h e a t a ~ . A

lor

rate of heating 3.8 derr$rable t o grersrve the protcbctir8

r e a l e on %ha metal,

4, The deporibion of haaoy aflrborartte meals encm.mt@rsd wieh ham3 water8 a m br eontrolled withln litnits by ~ l t r i n t a l n h g the %umga,ratrure ar low am porofbla, The

limit r a t above appsarr t o ba r ~ r r o n a b l a . 12halrs

r a r l i q

i a u r f o u m

on

banerrion heatsrm, O h ura of a t r a p o n

ewpXayrd t a

rmctriat

the a o t f va eacramion t a tha mag-

mmium,

rhioh $ 8 ammidwed +xp.nba ble, Howersr, sf

fec-

t i r e uaa of khir mmthdl appmarr limftmd ts

a+rtain

type8

of

w a t e r . T h s r e f o ~ , b . f o ~ thir nethod Ss urmd I t i r

naoeomrp t o chsak its e$?tectivsnemr wiOh the g a ~ t i a u l e ~ - rater in queotlon.

11, h l a t o r l s r of future tank failussa. %ampPao of t b a s tank8 rtll be Lnapeoted and the B ~ p o and 8 8 v @ ~ $ t g

OF

the f a i l u r e w i S 1 be s o r ~ 8 l a t e d w i t h th. eanditionr whlah aeursd tt.

Tfia .urveg of tank iai)iupsa and Wiair l i f e h l m t o r i e r rbould i u p p l j info~mution ragardirtp: ralcceiae rran$ition#

of

damrtie

b t

(9)

water tanks and

h.atarr

in B i f f m ~ n t parts of G~enda,

In

addf- tion, raw^ analyeem should be mmpiled so that the above in- fommtion oan be oorrelated l t h the a x d y r f r of the crit3c w r t a r 8 l A ~ p l i ~ 8 ,

The rbovs infomatian rhoulb a i d

Pn

d e f i n i n g l w a l l t i e r where aorroalon o f galvanlsed r a t a s syrtrrnb I r m8vot.e and l n wUah I t wotfld bs more sclonomieal to inatall tank8 b u i l t from aorroslon reaimtant mrterialr ruob ar monel metal glaar or ooppsr.

It rshould

elao ertablirh the optZQnua oparating oonditlons of

tamps,ature d

rate

of heating comprt;ible with dometla

re-

quirement a.

A survey of the roaling condftiorls will be rtarted through the medPunr o f tho quertionnabra and &auld bs extended to inoludo all P o ~ a l i t i e a whlch rare supplied by hard watar, k h l ~ info~?mit-

tion should be sup2lemnted by trial fnskallationr of the cliff-

erent type8 of keatirqg u n i t s moh as atpap-on, immersion and ride-arm ~ l r o u l e t l n g , t o evaluata the relative merits of t b r a different mothoda of heating dmerticr wrter nrpplisr,

I t im hapad tfirat thia work will a ~ a i r t i n aetablilrhing a practise for ths manufootwar, the glumbar and the home owner t o follow i n an effort t o r e d u e ths exoessive naetcb which now oQauFa,

(10)

IS*

tSSrl08e 3 %

: : ~ r ~ " ~ n l o n

UP

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etong.

carroaron,

st atn, 1Y47.

.Uagp*, 3. k, .*mglnmarlqig WPlrtPn, %mcdur "'nPwai*sity.

(11)

F I G . 1

CORROSION

.f

Z I N C

IN

A L R A T t D

DISTILLED

W A T L R ,

8

DATA F n O M , C O P O O S ~ O Y P L S I S T A X C I .f M E T A L S

#

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