GE P&W Hydrogen Sulfide Scavengers - Steamate PAS4011 - Manual

Fact Sheet
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* Trademark of General Electric Company; may be registered in one or more countries. AM-FSbSteamatePAS4011_EN.doc Oct-07
Steamate* PAS4011
Condensate Corrosion Inhibitor
• Combines the corrosion protection of neutraliz-
ing amines with the metal conditioning of an
organic oxygen scavenger
• Includes the patented GE Diamine, to maximize
neutralization of acids in condensate systems
• Reduces condensate iron and copper levels,
increasing the quantity and quality of reusable
condensate and minimizing waste
Description and Use
Condensate corrosion products are one of the ma-
jor contributors to deposition in boiler feedwater
heaters, economizers, and on boiler internal sur-
faces. Condensate corrosion is primarily caused by
the presence of carbon dioxide and oxygen. Feed-
water alkalinity decomposes in the boiler to pro-
duce carbon dioxide, which evolves into the steam.
This gas dissolves into the condensate to produce
carbonic acid, lowering the condensate pH and
producing metal loss.
Oxygen is found in condensate systems primarily
because of air leakage into the system through
condensers and transfer pumps. Once in the con-
densate system, oxygen attacks metal through a
pitting corrosion mechanism. The metal oxides pro-
duced through condensate corrosion can return to
the boiler in the feedwater system, where they may
deposit on economizer and boiler internal surfaces.
Deposits of metal oxides impede heat transfer and
cause metal overheating and failures. If the corro-
sion problem in the selected condensate stream is
severe, the stream is frequently sent to waste in-
stead of being returned to the feedwater system.
This increases the demand and operating costs for
the influent treatment and waste treatment sys-
tems.
In order to protect against carbonic acid corrosion
throughout a condensate system, Steamate
PAS4011 uses a unique blend of neutralizing
amines, chosen for their ability to distribute
throughout complex steam and condensate sys-
tems, and for their superior abilities to neutralize
acids and elevate condensate pH. This blend in-
cludes the patented GE Diamine, one of the most
powerful neutralizers available for condensate cor-
rosion control.
In addition to the blend of neutralizing amines,
Steamate PAS4011 utilizes an organic oxygen scav-
enger and metal conditioner. The oxygen scavenger
reacts with oxygen to minimize pitting and corro-
sion and promotes the formation of protective iron
oxide in the condensate system. Once the protec-
tive metal oxide layer is formed, continued feed of
Steamate PAS4011 helps to maintain it. The results
are improved corrosion control and a reduced level
of corrosion products in the boiler feedwater.
Improved corrosion control reduces the potential
for boiler tube failures and the need to dump con-
densate to waste. It also minimizes energy and
maintenance costs associated with corrosion-
related failures of piping, exchangers, and steam
traps. Improved feed-water quality can also provide
increased cycles of concentration in boiler systems,
which means saving water, chemicals, and energy.
Treatment and Feeding Requirements
Steamate PAS4011 can be fed to the feedwater,
main steam heater, or condensate system for
system wide effectiveness.
Control is based upon a combination of boiler
feedwater alkalinity, system metallurgy, and
amount of returned condensate. Your GE
representative will assist you in determining an op-