▲Note

▲Note

Water Treatment

Blowdown

Blowdown, or bleed-off is the continuous removal of a portion of the water from the circulating system. It is used to prevent dissolved solids from concentrating to the point where they will form scale. The amount of blowdown required depends upon the cooling range (design hot water temperature minus design cold water temperature) and the composition of the make-up water (water added to the system to compensate for losses by blowdown, evaporation, and drift). The following table shows the amount of blowdown (percent of total water flow) required to maintain different concentrations with various cooling ranges:

Cooling Range

1.5X

2.0X

Number of Concentrations

5.0X

6.0X

2.5X

3.0X

4.0X

10°F (

5.56°C)

1.58

0.78

0.51

0.38

0.25

0.18

0.14

15°F (

8.33°C)

2.38

1.18

0.78

0.58

0.38

0.28

0.22

20°F (11.11°C)

3.18

1.58

1.05

0.78

0.51

0.38

0.30

25°F (13.89°C)

3.98

1.98

1.32

0.98

0.64

0.48

0.38

30°F (16.67°C)

4.78

2.38

1.58

1.18

0.78

0.58

0.46

Multipliers are based on drift of 0.02% of the circulating water rate.

Example: 150,000 gpm (9465 L/s) circulating rate, 28°F (15.56°C) cooling range. To maintain 3 concentrations, the required blowdown is 1.1% or

.011 times 150,000 gpm (9465 L/s) which is 1650 gpm (104.1L/s).

If tower is operated at 3 concentrations, circulating water will contain three times as much dissolved solid as the make-up water, assuming none of the solids form scale or are otherwise removed from the system.

The use of corrosion and scale inhibitors is strongly recommended.

Chemical Treatment

In some cases chemical treatment of the circulating water is not required if adequate blowdown is maintained. In most cases, however, chemical treatment is required to prevent scale formation and corrosion. Sulfuric acid or one of the polyphosphates is most generally used to control calcium carbonate scale. Various proprietary materials containing phosphates or other compounds are available for corrosion control. When water treatment chemicals are required, the services of reliable water treating companies should be obtained.

The circulating water pH should be maintained between 7.0 and 8.5.

The Langelier index (calcium carbonate saturation index) has proven to be an effective tool in predicting the aggressiveness of cooling tower water toward concrete. The Langelier index relates the methyl orange alkalinity, the calcium hardness, the total solids, the pH value, and the temperature of the water. From these values it is possible to calculate the index and

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SPX Cooling Technologies 800 user manual Water Treatment, Blowdown, Chemical Treatment
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800 specifications

SPX Cooling Technologies 800 is a highly advanced cooling tower designed for commercial and industrial applications. This state-of-the-art equipment is recognized for its efficiency, reliability, and robust construction. The 800 model is engineered to meet the demanding needs of modern cooling processes, ensuring optimal performance in various settings.

One of the main features of the SPX Cooling Technologies 800 is its innovative design which contributes to superior heat transfer capabilities. The large surface area of the cooling fill maximizes the interaction between air and water, enhancing cooling efficiency while reducing operational costs. This design also supports effective thermal performance with lower water consumption, making it an environmentally friendly option for businesses.

The unit's fan technology is another standout characteristic. The SPX Cooling Technologies 800 employs low-noise, high-efficiency axial fans that optimize airflow while minimizing sound levels. This consideration for noise reduction makes it ideal for installation in noise-sensitive environments without compromising on performance.

Moreover, the 800 model incorporates a corrosion-resistant casing, fabricated from high-quality materials like fiberglass-reinforced plastic. This durability ensures a long service life and reduces the need for frequent maintenance, which in turn lowers operating costs. The design also allows for easy access to internal components, streamlining servicing and inspection processes.

SPX Cooling Technologies has also integrated advanced automation features into the 800 unit. With intelligent control systems, operators can easily monitor and adjust performance parameters remotely. This capability enhances operational efficiency and allows for predictive maintenance, ultimately extending the equipment's lifespan.

This model is suitable for a variety of applications, including industrial manufacturing, commercial HVAC systems, and process cooling. The flexible design options and customizable configurations allow it to meet specific site requirements, ensuring compatibility with existing infrastructure.

In summary, the SPX Cooling Technologies 800 stands out in the market for its combination of high performance, durability, and efficiency. With features such as advanced fan technology, corrosion-resistant materials, and intelligent automation, it offers a comprehensive solution for modern cooling needs, catering to a diverse range of industries while promoting sustainability and cost-effectiveness.
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