For preventing the corrosion of the metal parts submersible seawater pumps are making use of titanium in all the metal arts which include bolts and nuts, plugs that are coming in contact with the liquids. Titanium is most suitable for handling the seawater but it is super expensive and this is it’s disadvantageous which are been shown in the costs of material. For countering this problem, there are TM-series pumps that are making use of titanium in combination with the same high functional resin which is been adapted in the VANCS series. So the problem of cost and seawater both are been solved in these resin pumps.
It is very difficult to handle the seawater with general pumps when the pumps are not providing any countermeasures as seawater will cause corrosion and as a result, the performance of the pump will deteriorate and in the worst case, the pump would fail. In conventional applications, the seawater is been handled with a submersible pump Singapore which is coated with castings and stainless steel pumps. Stainless steel pumps are suffering from corrosion in the form of pitting and crevice corrosion but the cast pumps only corrode when the coating will peel off. So we can say that due to the corrosion the service-life of these pumps is very short.
Stainless Steel Corrosion
Mostly in seawater applications, stainless steel pumps are used. Stainless steel parts will suffer from localized corrosion and this will cause failures of insulation due to intrusion in water in the motor. This will result in an unexpected increase in cost. Stainless steel will also provide resistance to the high corrosion when the chromium oxide protective film is formed on the surface. When this protective film is not been maintained then due to the shortage of oxygen the corrosion resistance will be reduced significantly. For example when the marine organisms or packing will adhere to the film of chromium oxide then the shortage of oxygen would occur under the adhering substance and the film of chromium oxide will not be integral. When the pump will keep on running in this condition then localized corrosion would occur in the form of pitting and crevice corrosion. Therefore in the stainless steel pumps also caution is required. This also means that stainless steel pumps are not resistant to seawater. As a result in the field test when seawater is used, crevice corrosion will occur in the stainless steel nuts, bolts, frame, and washers after operating just for 6 months. Particularly the motor shaft would be heavily damaged with heavy corrosion.
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