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PRODUCT INFORMATION

BC-S

INTROLDUCTION 5. Be particularly effective in protection

The more common causes of corrosion failures
peculiar to boilers and auxiliary steam generating APPLICATION
equipment. Scattered pitting in the presence of
oxygen is sometimes observed at the water line in BC-S dissolves easily in cold water and can be fed
the steam drum and in the downcomer tube of separately or together with other water conditioning
boilers. Economizers, on account of their high chemicals. A 10% feed solution is recommended.
temperature, are also particularly susceptible to Approximately eight ppm of sulfite is required for
corrosion by oxygen. Corrosion of iron and copper in every one ppm of oxygen consumed. For best result,
condensate systems leads to the formation of porous continuous feeding is recommended. Because of
deposits under which salts in boiler water rapid reaction with oxygen, a fresh feed solution
concentrate and damage the underlying steel. should be prepared every 8 hours. It is advisable to
Oxygen is introduced into boilers dissolved in the put a wooden or PVC floating lid in the feed tank to
feed water. When this water enters the steam drum prevent the reaction between sulfite and atmospheric
most of the oxygen flashes into the steam space, oxygen. Treatment is controlled by determining the
producing characteristic pitting at the water line and residual of 20 - 40 ppm. (BS 2486 : 1978) as sulfite in
in vicinity of discharge of the feed line. In addition, boiler.
BC-S severe local corrosion the concentration of
dissolved oxygen in feed water can be reduced. BC-
S is a powerful catalyzed sodium sulfite in dry free HANDLING
flowing powder from which effectively removes the
last trace of dissolved oxygen in the boiler feed Keep cool and dry to prevent caking.
water, regardless of temperature.

PACKAGING

BC-S is packing in bags containing 50 Kgs. net
THE OBJECT OF OXYGEN REMOVEVAL weight.

Dissolved oxygen has long been recognized as a
serious cause of corrosion problem in steam boilers.
Its removal from the feed water is essential to ensure
efficient and economical operation of the plant. BC-S
when added to boiler feed water in controlled
amount, will react rapidly with dissolved oxygen in
the boiler feed water. The concentration of dissolves
oxygen in feed water should be less than 0.003 ppm
and preferably less than 0.005 ppm in water for high-
pressure boilers. Cold water saturated with air
contains about 10 ppm of oxygen. This can be
reduced to 0.3 - 0.7 ppm in an open heater, and to
about 0.01 in a spray-type deaerating heater. Finally,
the concentration of oxygen is reduced to zero by
BC-S.

ADVANTAGES

1. Prevent oxygen corrosion in boilers.
2. Easy to dissolve
3. Easy to test and control by using standard method.
4. END product of the reaction is harmless to the
system.

TECHNICAL SERVICE
WELLMAN CO.,LTD HAS A STAFF OF TECHNICAL SERVICE
ENGINEERS WHO WILL ASSIST AND TRAIN YOUR MEN ON THE PROPER
EVALUATION AND APPLICATION OF OUR CHEMICALS AND GIVE
RECOMMENDATION TO ENSURE SMOOTH OPERATION
THIS SERVICE IS GIVE FREE OF CHARGE