Chemicals – For closed and open cooling systems
By adding chemicals inhibitors, biocides, dispersants etc. to the cooling water, it is possible to avoid or minimize the four main issues in cooling systems, namely corrosion, lime, fouling and bacteria growth. Furthermore, it is sometimes necessary to prevent freezing of the cooling water by adding anti-freeze/glycol.
To ensure such cooling systems are correctly maintained and operate at optimum efficiency it is essential that the correct cooling water conditions are established and then maintained at all times. This can be achieved using carefully selected cooling water treatment chemicals preferably based on a water and plant analysis.
Guldager is able to supply all cooling water systems related chemicals.
Find out more:
What are chemical inhibitors?
In order to maintain the cooling capabilities of the system and thereby maximizing the value of the cooling system as well as improving the environmental profile, it is vital to perform proper water treatment and preventive maintenance.
By adding chemical inhibitors to the cooling water, it is possible to avoid or minimize the four main issues in cooling systems, namely corrosion, scale, fouling and bacteria growth.
How do chemical scale inhibitors work?
Since most minerals are more soluble at a lower pH, adding acid to the cooling system can keep the common scale forming minerals dissolved and prevent the start of the crystallization process. This is also called threshold inhibition.
Kinetic inhibitors modify the crystal structure of the scale greatly reducing the growth speed of deposits.
How do chemical fouling inhibitors work?
The purpose of the chemical fouling inhibitors is to keep the foulants suspended in the water flow thereby preventing them from settling on the metal surfaces. This can be accomplished in two ways. Firstly by a chemical process known as charge reinforcement, where the electrical charge of the foulants are increased thereby causing them to repel one another. Secondly wetting agents can be used to reduce the surface tension of the water, in a sense making the water wetter.
Keeping the suspended materials in the water flow mean that they can more easily be removed from the system either through blowdown or filtration.
What are chemical bacterial inhibitors?
Bacteria and biological growth in a cooling tower/evaporation capacitor can negativly affect the efficiency due to coatings. In addition, cooling towers/evaporation capacitors have good growth conditions for legionella due to temperature and nutrients.
By treating the cooling water with biocides, the undesirable effects of biological fouling and legionella can be avoided. There is a basis for a more efficient and safe operation without the risk of infecting the environment. Our practice is to use two biocides with different effects in order to avoid resistance and improve the effect.
Global service and after market support
To make sure that the water treatment is always in good condition it is strongly advisable to perform periodic testing, control or sampling of the water.
In Guldager’s laboratory facility we can perform these tests and our service technicians can perform the onsite sampling and reporting.
To cope with these issues Guldager offers a service/maintenance contract tailored to individual needs.