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Join Date: Jan 2010
Posts: 28

Cooling Tower Makeup Water Quality

01/14/2010 11:36 PM

which plant will be suitable for cooling tower performance

softening or RO Plant bcoz there are so many paramter which are to be taken in makeup water quality like hardness, TDS, Turbidity etc so hardness may be reduce by softening plant for preventing the scale formation during the cooling tower operation but TDS will be increased during evaporation losses so please give a best solution which is to be chosen from softening or RO

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Guru
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#1

Re: cooling tower make up water quality

01/15/2010 12:01 AM

No one-size-fits-all answer is likely to make sense. It depends on local water conditions. Usually a local water treatment supplier will be a good source of information. One rule of thumb is to bleed off about an equal amount of water as is evaporated, but this again varies by local conditions. Clean water, bleed and/or treat less; bad water, bleed and/or treat more.

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Associate

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#2
In reply to #1

Re: cooling tower make up water quality

01/15/2010 12:06 AM

Thanks sir

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Anonymous Poster
#3
In reply to #2

Re: cooling tower make up water quality

01/15/2010 12:56 AM

Contact a water rep, for example GE Betz (one of the most well known worldwide)

http://www.gewater.com/who_we_are/our_locations/index.jsp

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Anonymous Poster
#7
In reply to #3

Re: cooling tower make up water quality

01/16/2010 7:56 AM

I would offer up General Electric Water division also. They offer many other services to save your company money by using their products and set up too... Good Luck!

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Guru
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#4

Re: cooling tower make up water quality

01/15/2010 7:30 AM

It's an economic balance that involves the cost of mains water supply and waste water disposal, the cooling duty required, local atmospheric conditions, the cost of cooling tower treatment chemicals, the cost of tower feedwater treatment, tolerabale tower blowdown setpoints, etc., etc.

All of that is a function of the incoming water quality and the available treatment process on site. So, Guest is correct. It needs to be sorted out locally by bringing in a specialist.

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Participant

Join Date: Jan 2010
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#5
In reply to #4

Re: cooling tower make up water quality

01/15/2010 10:10 AM

No RO for Cooling Tower water. Need to analyze the make up water and recirculated water to develop program. there are Chemical and non chemical solutions but no "one size fits all"

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Guru

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#6

Re: Cooling Tower Makeup Water Quality

01/15/2010 11:35 PM

Usually softening plant is used along with cooling tower. R.O plants are used for water treatment especially for drinking water usage. Water contains different types of salts. Small portion of water that evaporates in the C.T leaves behind in the tanks its portion of dissolved salts. Evaporation loss of water is made up by make up water, but the salts left behind by the evaporating water mixes with tower water. This increases the concentration of salts in CT tank water. Generally to reduce the build up of hardness Bleed off is carried out and its rate should be equal to the evaporation rate. Besides draining and cleaning of the CT regularly may reduce the frequency of scale formation in the condenser.

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#8

Re: Cooling Tower Makeup Water Quality

01/16/2010 10:58 PM

As stated by others, contact a water treatment expert. The company I work for uses GE Betz.

In general though, softening is usually the best alternative for cooling towers. RO is used for boilers, etc.

Systems using softening:

  • usually less expensive
  • problems caused by impurities can be chemically controlled
  • fresh water usage (make-up) approximately equals evaporation plus blow-down in system using softened water
  • RO rejects 50-80% of fresh water used. The same amount of make-up water is still required as needed by the soft water system. The result is the RO system requires 2 to 3 times the amount of water.
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