Filter
Top Products
BOILER FEED SYSTEM
DATE: 4/3/03
REP:2/1/99
11
FILTRATION
For some old systems, there is a reluctance to clean the piping because of the possibility of leaks
occurring in badly corroded lines. Should the customer refuse cleaning, it is necessary to install
filtration equipment. Install either a fibrous filter or a centrifugal filter in the boiler return piping. This
will collect and remove sediment from the system. A booster pump may have to be installed as
well to overcome the additional pressure drop introduced in the line by the filter. When filling the
system, provide chemical treatment as outlined in Section 3.5.
CAUTION
Failure to properly clean the system or to install mechanical sediment removal equipment can
result in pipe blockage and severe corrosion plus damage to pumps, controls, and air removal
devices.
3.5 BOILER WATER TREATMENT
PURPOSE OF WATER TREATMENT
Water treatment is required for satisfactory operation of the boiler system. It must be devised to
prevent depositing of scale and corrosion and other such harmful elements that may be in the
water supply.
A qualified water treatment chemist should be consulted and the water systematically treated.
OBJECTIVES
The basic objectives of water treatment are:
Prevent the accumulation of scale and deposits in the boiler system.
Protect the boiler against corrosion.
Maintain the highest possible boiler efficiency.
Decrease the amount of boiler system down time from cleaning.
CONTINUOUS MONITORING REQUIRED
Water treatment should be checked and maintained whenever the boiler is operating. The boiler
operator should be sure that the boiler is not operating for long periods without proper water
treatment.
Water treatment may vary from season to season or over a period of time. Therefore, the water
treatment procedure should be checked not less than four times a year, and possibly more
frequently as the local water conditions may indicate.
All water introduced into the boiler system should be softened and should include an oxygen
removal system. This is required to remove dissolved oxygen from the water. Dissolved oxygen
can cause severe corrosion in the heating system.
DRAINING AND REFILLING THE BOILER & SYSTEM
If the system is drained and then refilled, chemical treatment is essential to treat the make-up
water. Use only clean, softened water