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Differences Between Demineralized Water And Boiler Feed Water


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#1 Vegeta

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Posted 09 August 2022 - 01:15 PM

Team,

Is there a difference between demineralized water and boiler feed water? If yes, what is the difference?

Thanks in advance...

#2 Pilesar

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Posted 09 August 2022 - 02:14 PM

You might not see any difference in a lab sample. Demin water can be used for many purposes. Boiler feed water is used to make steam. Specification for boiler feed water usually includes oxygen removal and perhaps pH which are not usually spec'd for demin water.



#3 latexman

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Posted 09 August 2022 - 03:34 PM

BFW usually starts with the water you have on hand, and then you use the cheapest way to make it acceptable for long boiler life.  Sometimes you just dearate it, sometimes you soften it, sometimes you demineralize it.  It really depends on the water quality you have available.



#4 breizh

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Posted 09 August 2022 - 08:10 PM

Hi,

Consider this link to support your query :

https://www.watertec...water-treatment

 

Note : Pure water is corrosive !

 

Good luck

Breizh 



#5 fallah

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Posted 09 August 2022 - 11:20 PM

Is there a difference between demineralized water and boiler feed water? If yes, what is the difference?
 

 

Hi,

 

In general, yes there is...demineralized water is almost (and close to) pure water while BFW can be included a little bit chemicals for PH adjustment, oxygen removal,...



#6 Vegeta

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Posted 14 August 2022 - 09:12 AM

Thanks all for your helpful feedbacks....

 

I have an additional question which is: what are the reasons for dictating a boiler feed water storage tank after the ion exchange package? 

 

I have seen some configurations where the outlet water from the ion exchange package is fed directly to the deaerator and some others where the water is fed to a tank and from there to the deaerator.  I can think of the tank as a buffer for abnormalities of boiler's operation but is that the only reason or there are other reasons e.g. related to the water chemistry. 

 

Your cooperation is highly appreciated....  

 

 

Regards, 



#7 Pilesar

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Posted 14 August 2022 - 12:56 PM

An intermediate tank gives time to recover from process upsets while keeping the operation of two areas somewhat disconnected.



#8 breizh

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Posted 14 August 2022 - 07:17 PM

Hi,

Agree with Pilesar , one example of discontinuity is the back wash of the resins , meaning no more supply of purified water , the reason why an intermediate tank is necessary.

Good luck

Breizh 






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