. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. de formed re-hydrolizes, formingthe metallic hydroxide and setting the hydrochloride acid free again. Theprocess will then begin all over again and continue as an indefinite cyclicprocess, so long as there is enough free oxygen present to keep the elec-trolytic circuit depolarized. As new water is added additional hydro-chloric acid is set free and if allowed to concentrate, as in boilers, is oneof the most dangerous corrosive elements met with in practice. In the case of sea water which is sometimes he
. Transactions - American Society of Heating, Refrigerating and Air-Conditioning Engineers. de formed re-hydrolizes, formingthe metallic hydroxide and setting the hydrochloride acid free again. Theprocess will then begin all over again and continue as an indefinite cyclicprocess, so long as there is enough free oxygen present to keep the elec-trolytic circuit depolarized. As new water is added additional hydro-chloric acid is set free and if allowed to concentrate, as in boilers, is oneof the most dangerous corrosive elements met with in practice. In the case of sea water which is sometimes heated for bath purposes,this action is very marked and can only be retarded by neutralizing theacid the removal of the free oxygen from the water. 184 Transactions of Am. Soc. of Engineers The sulphates are not materially affected by the temperatures of or-dinary hot service water, and have no particular bearing upon incrusta-tion or corrosion in these systems. It should be noted, therefore, in thisconnection that the hardness due to sulphates in a water does not neces-. FIG. 3. CUT-AWAY VIEW OF DE-AERATING DEACTIVATOR,SHOWING CONSTRUCTION sarily indicate that such a water will precipitate any scale forming pro-tective coating in the pipes and boilers unless the carbonates be presentalso. It will be seen that soft waters and such hard waters as contain smallquantities of bicarbonates are not scale forming in ordinary hot watersystems and do not therefore tend to protect against corrosion in this way. The foregoing gives a fair idea of the relationship between the chemi-cal properties of the water and the subjects of incrustation and corrosion,
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