GE P&W GenGard Corrosion Treatment Programs - Manual

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FS1296EN.doc Jul-10
Fact Sheet
GenGard* Technology
For Open Recirculating Cooling Systems
• Maintains System Cleanliness
• Only Halogen Stable Technology in the World
• Uncompromised performance under stressed
conditions
Description and Use
GenGard* is the most advanced and effective water
treatment technology for open recirculating cooling
systems. GenGard treatment programs can be ap-
plied across the entire pH spectrum from neutral to
alkaline and ensure uncompromising results even
under the most stressful conditions. The programs
incorporate the most advanced deposit and corro-
sion additives available. The patented GenGard
technology includes a new Stress Tolerant Polymer
(STP), Alkaline Enhanced Chemistry (AEC) and halo-
gen resistant azole (HRA) in combination with phos-
phate-based steel corrosion inhibitors.
All GenGard treatment components are stable and
retain their effectiveness in the presence of chlorine
and other halogens. Halogen stability allows
Legionella compliance when chlorine or bromine
residuals are continuously applied at effective levels
(0.5-1.0 ppm free Cl
2
) for general microbiological
control and during periodic system disinfections
(> 5 ppm free Cl
2
). Unlike conventional treatments,
GenGard provides the freedom to effectively re-
spond to microbial upsets without a loss of deposi-
tion or corrosion control.
The stress tolerant polymer (STP) is the culmination
of more than 30 years of polymer research at GE.
STP is designed to maintain phosphate-based and
zinc-based corrosion inhibitors soluble. (Figure 1)
The STP performance far exceeds that of conven-
tional polymeric dispersants, providing exceptional
corrosion protection while preventing deposition
even in the most demanding applications. The STP
performance is not adversely affected by aluminum
carryover from influent clarifiers, high temperatures
encountered with low flow heat transfer equipment
or soluble iron generated from corrosion or entering
with the makeup water.
AEC is the only effective non-phosphorus calcium
carbonate scale inhibitor for open recirculating sys-
tem operation above 2.5 LSI (Langelier Saturation
Index). Breaking the calcium carbonate supersatu-
ration barrier of organic-phosphate scale inhibitors
(phosphonates), AEC provides excellent deposition
control under severe conditions where others fail.
AEC’s superior calcium tolerance and hydrolytic
stability permit high cycle operation even under the
most stressed conditions.
GenGard products include HRA, a modified azole
that provides unequaled copper alloy corrosion pro-
0
10
20
30
40
50
60
70
80
90
100
% P
O
4 Inhibition
5 ppm 10 ppm
Polymer Dosage (ppm)
Terpolymer C Terpolymer B Terpolymer A AA/AMPS SAA STP
Figure 1: Calcium phosphate inhibition at 400 ppm calcium
hardness, pH 8.2, 10 ppm PO
4
, 160ºF (70ºC)