23
23
Corrosion and Scale Control
• To control corrosion and scale, maintain the water chemistry of the recirculating
water within the parameters listed in
Table 3
. The specific measures required vary
from system to system and are dependent on the chemistry of the make-up water, the
metallurgy of the piping and heat transfer devices exposed to the recirculating water,
and the temperatures at which the system will be operating.
• Bleed/blowdown, the continuous flow of a small portion of the recirculating water to
a drain, is used to control the concentration of dissolved solids. On rare occasions,
this may be adequate to control scale and corrosion. More often, chemical scale and
corrosion inhibitors are necessary, which can raise the allowable level of dissolved
solids without the risk of scale and corrosion.
• Keep the chemically treated water within the guidelines given in
Table 3
. In cases
where bleed/blowdown alone is being employed for corrosion and scale control without
chemical treatment your water treatment specialist may recommend more conservative
limits than those shown in
Table 3.
Table 3.
Recommended Levels for Various Materials of Construction
Corrosion Protection
Water Treatment
Corrosion and Scale Control
Chemical Treatment
Requirements
