GE P&W Hydrogen Sulfide Scavengers - CorTrol OS7785 - Manual (Page 2)

Page 2 Fact Sheet
Figure 2: CorTrol OS7785 promotes the reduction of iron
from the red, nonmagnetic state (Fe2O3) to the
black, magnetic state (Fe3O4). As a result, iron
removal with an electromagnetic filter can
increase from approximately 50 percent to over
95 percent.
The use of CorTrol OS7785 is beneficial where fe-
edwater is used for attemperation. When feedwater
containing an inorganic oxygen scavenger is used
for attemperation, harmful deposits on superheater
tubes and/or turbines may result. CorTrol OS7785 is
also beneficial in petrochemical plants as it does
not affect sulfur-sensitive catalysts.
CorTrol OS7785 can also be used for boiler layup.
Follow the recommended procedures for boiler and
superheater storage and feed at a minimum of
2000 ppm [mg/L] CorTrol OS7785 in the boiler water
(16.7 lb/1000 gal [2 kg/m
3 ] of boiler water). If the
boiler is fired during storage, supplemental pH ad-
justment may be required. Neutralizing amines or
ammonia should be used to keep the boiler water
pH above 10.0.
Treatment And Feeding Requirements
Feed Point - CorTrol OS7785 should be fed continu-
ously to the deaerator storage section or to the fe-
edwater line. For condensate protection it can be
fed diluted to the steam header or to condensate
lines.
Feedrate - Feed CorTrol OS7785 based on the boiler
feedwater dissolved oxygen level. Feed continu-
ously.
Dilution - Use good quality condensate, demineral-
ized water or deaerated feedwater to make a con-
venient feeding strength. The material may be
diluted in any proportion. Mild agitation should be
provided for initial mixing only. Product solution
should have minimum exposure to atmospheric
oxygen. If this material is fed from a day tank, it is
recommended that only a 24-hour supply be made
at a time.
Equipment - Feed CorTrol OS7785 using a mild
steel feed system. This product is suitable for use
with PaceSetter* automated chemical feed and
control equipment.
General Properties
Physical properties of CorTrol OS7785 are shown on
the Material Safety Data Sheet, a copy of which is
available on request.
Packaging Information
CorTrol OS7785 is a liquid blend, available in a wide
variety of customized containers and delivery
methods. Contact your GE Water & Process Tech-
nologies representative for details.
Safety Precautions
A Material Safety Data Sheet containing detailed
information about this product is available upon
request.
Without With
CorTrol OS7785
CorTrol OS7785