GE P&W Boiler Water Treatment Chemicals - OptiSperse HP54674 User Manual
Internal treatment (high purity systems), Description and use, Typical applications
Fact Sheet
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AM-FSbOptiSperseHP54674_EN.doc Dec-07
OptiSperse* HP54674
Internal Treatment (High Purity Systems)
•
Outstanding protection against metal oxide
deposition and caustic corrosion
•
Designed and field proven for high pressure
boilers
•
Cost-effective program cuts downtime and
maintenance
•
Provides optimum pH/phosphate control
Description and Use
OptiSperse* HP54674 is an aqueous blend of phos-
phate and polymeric dispersants. The product con-
tains SCP, a synthetic carboxylated polymer, which
disperses iron and other metal oxides.
OptiSperse HP54674 may be used alone or in com-
bination with other OptiSperse HP products, de-
pending on the feedwater quality, to provide
optimum pH/phosphate control in high pressure
boilers.
Typical Applications
Hardness is a minor constituent in water of high
purity. The major contaminants are typically iron
and copper oxides. Iron deposits are very porous;
this porosity makes the road to caustic corrosion
possible.
As steam escapes through the chimney-shaped
deposits, dissolved solids concentrate under the
deposit. Hydroxide is the predominant anion. As
such, sodium hydroxide can concentrate under the
deposit to produce caustic levels of 10% or more.
This results in caustic gouging of boiler metal.
OptiSperse HP54674 fights the problem on two
fronts. First, its exclusive polymer controls metal
oxide deposits. Second, its built-in phosphate buffer
neutralizes any free caustic in the boiler water. GE
Water & Process Technologies formulates the so-
dium-to-phosphate ratio required to keep your sys-
tem within control limits. This combination of
chemical mechanisms provides the most effective
coordinated phosphate/pH control program avail-
able. This treatment buffers the boiler water, pre-
venting localized pH excursions that lead to
corrosion of boiler metal (Figure 1).
Figure 1: Control diagram for a coordinated phosphate/pH
program.
The other key to GE program effectiveness is our
metal oxide-specific polymeric dispersant technol-
ogy. Our tailored treatment approach uses SCP,
synthetic carboxylated polymer, to disperse iron
and other metal oxides, maintaining clean heat
transfer surfaces. Caustic corrosion is prevented by
maintaining a phosphate buffer with coordinated
control.