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Sea water pump material technology introduction
Seawater Pump Material Technology Introduction Corrosion is the largest problem encountered in stainless steel construction and is widely used in sea water pumps - and even specialized brine pumps, such as those used in desalination, oil and gas, chemical, thermal and nuclear power plants. Here, Miyasaka and Hashida's Hideo, discuss solutions that are currently on sale to overcome crevice corrosion and take a look at the latest advances in this area of ​​work. Dissolution of chloride and other salts contained in large amounts of seawater causes localized corrosion of stainless steel and other metals passive. Corrosion can take the form of pitting, crevice and intergranular corrosion, and in high temperature seawater, SCC (SCC). Chemicals can also promote corrosion of steel and copper alloys, especially for high flow rates. Highly conductive seawater promotes macro cell corrosion such as galvanic corrosion and differential aeration of cells, including differential-flow cell erosion. If you can not protect your sea water, pump corrosion, they will corrode and become damaged in a very short period of time, resulting in a shutdown or critical safety issue. Ebara's experience in addressing these different erosion issues includes corrosion testing in the world of Japan's high seas around the gulf, the Arabian Gulf, the Red Sea and other marine environments. This is based on experimental and theoretical research in addition to materials science and electrochemistry in our laboratory to clarify the mechanisms used for corrosion mechanisms and marine development of highly corrosion resistant materials and advanced corrosion protection technologies. One accomplishment is the world's first clarified mechanism of squamous cell carcinoma, opposed to the development of Ni-resistant (austenitic nickel) cast iron and development of effective countermeasures, which was achieved in the mid-1980s. Stainless steel, which is the most widely used seawater pump material, is sensitive to crevice corrosion and requires effective countermeasures. Countermeasures available divided into two methods. One such method is the use of relatively economical materials such as Type 316 SS; the other is the use of highly corrosion-resistant materials such as Super Duplex, SZSE and Super Austenite Benefits. The former includes the use of fillers in the gap, crevice corrosion resistant alloy on the gap, the surface and the cathodic protection applications. Select the materials used should be with cost, maintainability, effective life taking into account. Coating technology Ebara has developed and commercialized a superposed crevice corrosion resistant alloy, 'crevelloy' (Ebara brand name). This material uses a highly corrosion resistant alloy of ferronickel - 30cr - 10mo a series of SS based on which the metal is based on the relatively inexpensive 316, which helps to prevent crevice corrosion. This product has been provided in the sea water pump shell, shaft, sleeve, tube more than 20 years. In particular, there is no other way in which a sliding gap can be created for the position of the vane and center of the variable-vane pump in the sealing portion. All pumps of this type use this technique. Crevelloy approves the standard at AWS (American Welding Association) as a standard for sfa5.14 ernicrmo-16 and EN (europeen de normalization), no. 6057, a chemical nicr30mo11. Boundary element analysis of system crevice corrosion can also prevent cathodic protection, at which effective protection is obtained by attaching anodes to the sacrificial anode in a correct position and predicting the rate of consumption and will presently appear. This prediction is usually based on the rule of thumb.è Original use of an established know-how for quantitative numerical analysis of cathodic protection design.è original collaboration with the Tokyo Institute of Technology (TITANIA) Applied Boundary Element Method (BEM) corrosion protection analysis for the first time. The Harahara Iron Group continues to have the most advanced technology in the world for anti-corrosion analysis. High-grade steel If living or repairing long-term - free water pumps are desirable, or pumps are intended for use in highly corrosive sea areas such as Rudong, high grade stainless steel is required. Stainless Steel and Pitting Resistance Equivalent (Front) Corrosion resistance at age 40 or above, known as super SS9 type and high nip. Ebara recommends Super Duplex SS9, which incorporates a number of high corrosion resistance and superior strength characteristics. The Arabian Gulf water contains a high level of total dissolved salts (TDS) and the temperature of the water is relatively high. The Red Sea has average salt consistency, but high and average annual temperatures are known. It is to be expected that seawater in the Middle East is more corrosive than any other parts of the world, but the corrosion resistance of different materials in seawater is not quantitatively compared in the Middle East. In cooperation with the Saudi Arabian Kitaro Salt Water Company (SwCC), Ebara conducted a soaking experiment with stainless steel in the sea east (Arabian Gulf and Red Sea). The results show that super-duplex wetlands provide good corrosion resistance in these areas. The test results will be in 2007 Kehui, scheduled for November 2007 in Bahrain. In the manufacture of super-biphasic SS pumps, it is crucial to use sufficient technology to achieve and maintain the corrosion-resistant heat-affected zone (HAZ) and the intense cold-war workspace. Ebara is having a lot of experience working in super-bi-phase wetlands and welding technology and has been offered to Middle East customers for many full-duplex and super-duplex SS large seawater pumps making use of this technology depending on the type of manufacturing process Used materials and costs, and intended to use the product.