Man L23/30DF, Project Manual

Page: 190 / 392

• Possible dispersing agent (in particular, if deposits
already exist in the boiler system).
MAN Diesel & Turbo recommends using combina-
tion products. This simplifies the treatment and
ensures that all vital points concerning water treat-
ment are taken into consideration.
During the warranty period and in the case of exist-
ing maintenance contracts, only the products men-
tioned in
Table 5, are to be used.
Producer Product
DREW Advantage 121 M
Nalco Nalco 72400
Unitor Liqu Condensate
Control
Table 5: Combination products for treatment of the feed water in
exhaust gas boilers without steam turbine
It is expressly pointed out that warranty for the
products used has to be taken over by the product
manufacturer.
The recommendations of the turbine manufacturer
are to be taken into consideration for the treatment
of water used in steam turbines. General recom-
mendations can, in this case, not be given.
Water maintenance
The following values of the feed water are to be
checked and documented regularly:
• pH Value, daily
• Conductivity, daily
• Hardness, daily
• Oxygen content, resp. surplus at oxygen binder,
daily
• Concentration of additives (according to manufac-
turer specifications)
• Iron content
• Acid capacity of up to pH 8.2 (pH value)
With regard to steam turbines, the following has, in
addition, to be checked weekly:
• Copper content, silicic acid
The following values of the
boiler water
are to be
checked and documented regularly:
• pH Value, daily
• Conductivity, daily
• Hardness, daily
• Iron content
• Acid capacity of up to pH 8.2 (pH value).
• Additive concentration (according to manufacturer
specifications)
The following values of the
condensate
are to be
checked and documented regularly:
• pH Value, daily
• Conductivity, daily
• Hardness
• Iron content
• Additive concentration (according to manufacturer
specifications).
Cleaning of the exhaust gas boiler
Cleaning at the exhaust gas side is carried out with
steam or water, by means of the corresponding
devices. In the case of water cleaning, special
requirements are not to be observed, with the
exception that sea or brackish water must not be
used.
Correct maintenance provided, water cleaning is
not necessary. Should cleaning prove to be neces-
sary, a suitable company has to be engaged, which
is able to carry out professional cleaning.
MAN Diesel & Turbo
B 13 00 0
Quality of water used in exhaust gas boiler plants
1699251-7.0
Page 2 (2)
L28/32S, L27/38S, L23/30S, L21/31S, L16/24S, V28/32S, L16/24, L21/31,
L23/30H, L27/38, L28/32H
2008.10.27