GE P&W Hydrogen Sulfide Scavengers - Steamate PAS6069 - Manual

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AM-FSbSteamatePAS6069_EN.doc Dec-07
Fact Sheet
Steamate* PAS6069
Oxygen Scavenger/Condensate Treatment
• Reduces feedwater iron and copper, increasing
boiler efficiency and reliability
• Contributes to passivation in preboiler and con-
densate circuits
• Controls oxygen corrosion in preboiler and con-
densate circuits
• Volatile oxygen scavenger allows for conden-
sate oxygen control with the ease of feedwater
application
• Contains patented oxygen scavenger/metal
passivator, diethylhydroxylamine (DEHA)
• Will not contribute inorganic solids to the feed-
water ideal for attemperation water use
• Controls carbonic acid corrosion in condensate
systems
Description and Use
Steamate* PAS6069 is designed for the control of
corrosion due to dissolved oxygen in feedwater sys-
tems and protection of condensate systems from
corrosion. The resulting absence of oxygen and
ideal pH conditions contributes to iron passivation.
Steamate PAS6069 is an aqueous organic oxygen
scavenger which does not contribute to inorganic
boiler water solids. It is not acceptable for use in
systems with direct food contact with steam or for
systems with steam humidification.
Typical Applications
Even with good deaerating heater operation, suffi-
cient dissolved oxygen can remain in the feedwater
to damage the boiler system. Even low levels of
dissolved oxygen are critical to high pressure (high
temperature) systems. Oxygen in water produces
pitting which is particularly severe because of its
localized nature. Economizers and feedwater heat-
ers are especially susceptible to oxygen attack.
When feedwater containing an inorganic oxygen
scavenger is used for attemperation, harmful de-
posits on superheater tubes and/or turbines may
result. Because Steamate PAS6069 contributes no
inorganic dissolved solids it is preferable to other
inorganic scavengers when feedwater is used for
attemperation.
Condensate corrosion is primarily caused by the
presence of carbon dioxide and oxygen. Feedwater
alkalinity decomposes in the boiler to produce car-
bon dioxide which is evolved with the steam. This
gas dissolves in condensate to produce carbonic
acid. Oxygen is present due to improper deaeration
or air leakage into the system. Both gases can re-
sult in damaging metal loss. Boiler system reliability
is reduced since corrosion products enter the boiler
where they can deposit and impede heat transfer
causing tube metal overheating and failure.
Steamate PAS6069 is unique since it functions both
as an effective oxygen scavenger and metal pas-
sivator at temperatures typically encountered in
condensate systems.
Since Steamate PAS6069 rapidly reacts to control
pitting on the system metal, even at low tempera-
tures, it protects condensate systems from oxygen
corrosion both during operation and shutdowns.
Once a protective iron oxide is formed Steamate
PAS6069 helps maintain it, resulting in reduced cor-
rosion. Significant inhibition of both iron and cop-
per oxide corrosion has been shown.
Steamate PAS6069 is also suitable in petrochemical
plants since it will not affect sulfur sensitive cata-
lysts. The use of Steamate PAS6069 results in a
negligible impact on steam purity and cation con-
ductivity in condensate.