The operation of a boiler depends on the feedwater. A feed pump delivers the feed water to the steam drum. The feed water is subsequently heated in the steam drum, where it is converted to steam.

The primary condenser receives the used steam after it has been used. It is then pumped to the deaerated feed tank from the condenser.

It then returns to the steam drum from this tank to complete its cycle. Never is the feed water exposed to the atmosphere.

One cannot undervalue the significance of filtering water before the boiler operation. To prevent scaling and fouling, which can harm and shorten the lifespan of the pricey boiler/turbine process, it is essential to remove organics, suspended particles, dissolved minerals, and dissolved gases.

Why treatment of boiler feed water is important?

For steam generating systems to function properly and to use less chemicals and fuel expenses due to less frequent blowdown requirements, high-quality feed water is necessary.

Scale accumulation and boiler corrosion are both prevented by using treated water with lower impurity levels. Untreated water can lead to deposits of silicate and colloids, which reduce boiler performance and may cause turbines to break early.


The process of boiler feed water treatment

An efficient boiler feed water treatment system functions by filtering out dangerous contaminants before they reach the boiler and by regulating the water’s conductivity and acidity. Despite the fact that treatment trains differ, a typical system will include primary treatment and, depending on the boiler pressure, the amount of steam used, and the chemistry of the boiler feed and makeup water, it may also include polishing.

Most often, a boiler feed water treatment system will perform any or all of the following procedures:

Intake makeup water

Boilers lose water while they are utilized due to leaks, condensate return loss, and steam consumption. Makeup water needs to be used in place of this water. Makeup water can be obtained from a raw water treatment plant or a treated city supply.


To remove silt, turbidity, and organic material from the stream, one or more filtration units are commonly used. Membrane filtering units can be a cost-effective way to stop fouling and excessive maintenance of downstream equipment when used as pretreatment in front of IX and other equipment.

Ion exchange softening

A softening resin can be used for prefiltration for boiler feed water if it contains high levels of hardness that are complexed with bicarbonates, sulfates, chlorides, or nitrates.

In this process, a resin is charged with a sodium ion, and as the hardness develops, it has a stronger affinity for calcium, magnesium, and iron, so it will capture that molecule and release the sodium molecule into the water. This is known as a strong acid cation exchange process.


Alkalinity can lead to corrosion in pipework, foaming, and carryover in boilers. Therefore, strong anion IX or weak acid IX followed by degasification are frequently used to treat boiler feed streams. These treatments serve to remove bicarbonate, sulfate, and nitrate ions, lowering pH.

Reverse osmosis (RO) and nanofiltration (NF)

Most of the dangerous elements that can foul and clog the RO/NF membranes have been eliminated thanks to the frequent usage of reverse osmosis (RO) and nanofiltration (NF) farther down the boiler feed water treatment system process.

Similar separation techniques use pressurized water to push through semipermeable membranes, trapping impurities including germs, salts, organics, silica, and hardness while letting concentrated, clean water pass.

These filtering devices, which are not always necessary in boiler feed water treatment, are typically utilized with high-pressure boilers where the concentration of suspended and dissolved solids must be very low.

Deaeration or degasification

The makeup water and condensate from the boiler system are mixed and degasified after all other treatment procedures have been completed.

Deaeration/degasification, which involves removing carbon dioxide and dissolved oxygen from the liquid stream, is crucial for avoiding corrosion.


The water is fed to the boiler where it is heated and utilized to produce steam after having been suitably cleansed in accordance with the boiler manufacturer’s recommendations and other industry-wide norms.

The plant uses pure steam, loses the steam and condensate, and then pumps the condensate back into the process to mix with the makeup water that has already undergone pretreatment.


To ensure the proper and safe use of your boiler, it is extremely important to filter the boiler feed water. This will help to some extent to ensure your productivity, minimize the cost of equipment maintenance, and shorten the duration of maintenance.

Brother Filtration has years of experience and manufactures all kinds of filter products to fulfill all filtration needs.

We produce various filter cartridges, filter bags, and filter housings, our depth pleated filter cartridges, high flow filter cartridges, and depth filter cartridges are suitable for boiler feed water application.


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