How to get rid of water inclusion?

The presence of dissolved salts and suspended inclusions in water often brings about many negative effects on heating and cooling systems. Therefore, we must pay special attention to water quality, related water treatment requirements and stainless steel pipe fittings to ensure the normal operation of the system, achieve efficient operation, low operating and maintenance costs, and in addition, the warranty conditions of various components such as boilers, heat pumps and refrigeration components need to be observed.

Inclusion in water

Inclusions contained in the system hydrating may be organic particles, such as bacteria and fungi, or may be inorganic, such as sediment, or soluble ions and salts which are affected by the quality of the water source (well, tap water). Residues during system installation or maintenance operations are also one of the reasons for system inclusion. The particles generated during the installation operation include residues of machined parts such as metal burrs, casting gravel, agglomerates and patent skins, sealing material residues (linen and Teflon tape) or lubricants (oil and dry oil). Inclusions in the system are caused by oxidation, corrosion or bacterial growth during operation. The existence of these inclusions will not only bring about physical problems (clogging, wear, stuck), but also chemical and electrochemical problems. For example, all sediments may give rise to lower sediments to corrode again, resulting in a geometric progression of corrosion. For example, all sediments may give rise to lower sediments to corrode again, resulting in a geometric progression of corrosion.

Inclusion Classification

Dissolving Inclusion

Dissolution inclusion means that the inclusion in the solution and the water form a tangible combination, which will not be separated by the agitation of the water. In general, the solution containing inclusions keeps still clear and transparent. Some compounds in the solution become suspended due to the effect of temperature, such as calcareous scaling. Substances that easily enter the solution include ions, salts, gases, and some bacteria, which aggregates to form gums.

Colloidal Inclusion

A colloidal substance (or colloid) is exceedingly fine particles, which are dispersed in water and do not form a solution because it does not form a true bond with water. The water containing colloid will show a unique color according to the type of colloid, and consequently, it becomes opaque. At the same time, the gum will separate from the water due to temperature and agitation. Therefore, the colloid will not be deposited due to precipitation unless additional substances are added to the water to make it deposit. However, it may deposit and form scales in some critical parts of the system (such as exchangers) where the temperature is particularly high. In addition, it will cause wear on the flowing material. The most typical colloid found in water in heating systems is magnetic particles, an iron oxide.

Iron Oxide

In heating systems, oxides are the residue of micro-electrolytic corrosion or corrosion reactions. Iron oxides are first deposited like sludge in places where corrosion occurs, and when they reach the heat exchanger, they harden due to temperature increase and form scale. Because iron oxide is magnetic, it is possible to use a magnet to separate the iron oxide from the system water. Otherwise, it is difficult to completely intercept it through ordinary filtering and decontamination elements.

Suspended Inclusion

Suspended inclusions are those particles whose specific gravity reaches a certain weight, which will not form a real bond but will only form scale with the circulation or deposition of water. Common particles suspended in water are sand, sludge, and processing residues, whose mixture makes the water dull and cloudy.

Harm Caused by Inclusions

Abnormal Valve Operation

Inclusions are firmly attached to the valve seat, causing the valve to close tightly and fail to adjust. Usually, the water flow channel of the regulating valve is very narrow, and as a consequence, even small particles may cause blockage.

Pump Clogged and Stuck

Due to the particularity of the internal circulation structure of the water pump and the magnetic field generated during operation, inclusions in the water flow tend to accumulate inside the water pump, causing the water pump to block or completely jam.

Reduced Thermal Efficiency of the Heat Exchanger

Suspended particles and corrosion residues in the heat exchanger will have two negative effects. on the one hand, it will block the flow of water and greatly reduce the flow of water. On the other hand, it will reduce the heat exchange area and reduce the heat exchange efficiency. In addition, the formation of these scales and deposits is unevenly distributed, resulting in significant temperature differences in various areas and local overheating of the heat exchanger metal. Local overheating will bring about vaporization of the water inside, accompanied by a significant increase in noise, and moreover, in extreme cases, the heat exchanger will break due to strong expansion of concentration.

Decontamination filters are increasingly used on the market, which have the capability to remove all particles that may cause serious problems to system components from the first cycle. Likewise, they minimize the risk of clogging and avoid frequent maintenance to greatly increase the service life of pipes and fittings. In addition, the choice of pipe fittings also plays an important role. We can use stainless steel valve and carbon steel valve for water treatment valve, and stainless steel pipe fitting can be used for pipe fittings.