According to EN 12953-10:2003 (Shell boilers: Requirements for feed water and
boiler water quality.
a
If non-ferrous materials are present in the system, e.g
.
aluminum, they may
require lower pH value and direct conductivity, however, the protection of the
boiler has priority.
b
Organic substances are generally a mixture of several different compounds.
The composition of such mixtures and the behavior of their individual components
under the conditions of boiler operation are difficult to predict. Organic substances
may be decomposed to form carbonic acid or other acidic decomposition products
which increase the acid conductivity and cause corrosion or deposits. They also
may lead to foaming and/or priming which shall be kept as low as possible.
Note: During boiler economic life, the total make up water volume can not be
more then 3 times of the total system water.
Guarantee will not be valid, if the boiler is out of service because of corrosion,
sludge formation and deposits.
In order to prevent corrosion special care needed for oxygen infusion to the heating
system water side. Possible points for oxygen infusion are from open vented
cisterns, negative pressure points on the system and some gas permeable system
items like plastic pipes.
23
BOILER WATER and MAKE UP WATER FOR HOT WATER BOILERS
To Next Page
Loading...
