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How to prevent corrosion problems in centrifugal pumps?
发布日期:2019-07-27 23:55:00 点击数:3340新闻来源:
Corrosion in the centrifugal pump can affect the wet surface or a small portion of its internal components, which are general or highly localized. Typically, pump failures are caused by highly localized and affected components. Therefore, it is very important to find a solution that reduces the effects of corrosion.
Let's take a look at the different ways to reduce corrosion! Not only will this save you millions of dollars, but it will also extend the life of your pump.
1, material selection
When solving corrosion problems, material selection should be considered first. This not only handles corrosion problems, but also selects the best material to reduce the rate of degradation based on the operating conditions of the centrifugal pump.
Cast iron has a relatively low corrosion resistance and can quickly reduce pump performance. Therefore, pump manufacturers use stainless steel to avoid corrosion.
Please note that the correct material selection is ultimately the responsibility of the user. Only the user can control the liquid being pumped relative to the concentration, temperature, and the like. It is the responsibility of the pump manufacturer to provide the materials of choice under physically good conditions and to provide the correct chemical composition while meeting specified hydraulic requirements. In practice, a trusted pump supplier will provide guidance based on his experience with previous applications involving similar services.
We recommend that you carefully consider the choice of materials, which is one of the most effective ways to improve the corrosion resistance of your pump.
Sources of information that can be referenced for material selection include:
(1) First-hand in-plant experience;
(2) Similar applications in other locations;
(3) Corrosion diagram of hydraulic research institute;
(4) Recommended drawings of mechanical seals;
(5) The experience of the pump manufacturer;
(6) Appropriate literature, texts and similar references.
Normally, no data available will specifically satisfy the conditions, especially if a solution containing several concentrations of several chemicals is pumped. When the temperature is increased by 10 ° C, the corrosion rate can be doubled.
The presence of dissolved air or other oxidant in the liquid may cause the corrosion rate to accelerate separately, otherwise it is considered acceptable. Under certain conditions, trace amounts of only a few million parts of the element may be sufficient to cause severe corrosion attack, and the basic composition of the solution generally does not cause a severe corrosion reaction.
Likewise, pitting that occurs during an extended down cycle can be suppressed as much as possible by evacuating and flushing the pump as it enters the "down" cycle.
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