Reasons to Choose Titanium Pumps for Highly Corrosive Chemicals ...

The thick viscosity and uneven texture of slurries make them difficult enough to pump on their own. Add in extra causes of damage such as corrosive fluids and abrasive materials and it becomes very difficult to maintain a slurry pump for any amount of time. Impellers and other parts quickly wear down or dissolve, resulting in costly pump repairs and replacements every few months to years. Titanium has long offered the potential for better resisting corrosion damage in particular, but machining limitations have prevented the metal from being used in pumps designed for slurries. EDDY Pump is currently developing a titanium-based slurry pump that offers many benefits to companies dealing with highly acidic and abrasive slurries.

For more information, please visit Huakai Anti-Corrosion Equipment.

Stainless steel is the most commonly used metal found inside slurry pumps. From the heavy duty impellers to outer casings, this material offers decent corrosion resistance when compared to aluminum or iron. However, stainless steel is not a perfect material, especially for slurry pumps that deal with a lot of daily wear and tear. The steel is relatively brittle at the higher hardness levels, which can cause it to crack in reaction to forces such as cavitation. Despite the addition of chromium and other metals like nickel and magnesium, stainless steel only resists a certain amount of corrosion depending on the exact alloy. All stainless steel alloys are prone to corrode when exposed to the harshest industrial chemicals, and the abrasive nature of slurries increases the chances of corrosion after pitting develops along interior surfaces.

EDDY Pump’s newest titanium slurry pump won’t just offer more to the industry thanks to the use of corrosion-resistant titanium materials. Like all of the other designs from EDDY Pump, the new titanium model will be based around the power of the EDDY current. Similar to the cyclonic forces generated by a tornado, the EDDY current is generated by an open rotor rather than an impeller. This allows even the largest pieces of debris to pass through without clogging up the pump or producing impeller wear. Rotor-powered slurry pumps create a higher amount of suction without the critical tolerance restrictions impeding other pump designs. Combine this EDDY current technology with the durability of titanium and enjoy a slurry pump that requires far less maintenance and repairs despite difficult conditions.

Titanium offers higher corrosion resistance to acidic chemicals on both extreme ends of the pH scale and chemical mixtures high in chloride. Stainless steel is only corrosion resistant on the surface of the metal due to a layer of oxidation that forms across the metal upon exposure to oxygen. When that protective layer is scratched or marred, a common form of wear in highly abrasive slurry processing systems, rust can quickly develop. Titanium and its alloys maintain corrosion resistance throughout the material and not just at the surface, preventing corroding from the beginning, even when there are wear and damage through mechanical means.

For more information, please visit Stainless Steel Corrosion Resistant Self-Priming Pump.

Aside from greater corrosion resistance than stainless steel, titanium offers other benefits that are particularly useful in slurry pumping applications. This metal has a higher level of elasticity than stainless steel or iron, increasing its ability to withstand shocks and the pressure of fluid cavitation during pump operation. Fewer cracks are likely to form in a pump casing made with titanium or an alloy containing it than one made from steel. Finally, titanium alloys are relatively strong when compared with steel. Pure titanium is slightly less resistant to abrasion than most forms of steel alloy, but this is easily improved with the addition of secondary metals. There are plenty of titanium alloys available for use in slurry pumps that have as much abrasion resistance, if not more, than the typical stainless steel material.

In general, slurries are difficult to move through a pump and pipe system thanks to high viscosity and the potential for large pieces of debris or suspended solids. When the slurry mixture is also corrosive, due to an extremely high or low pH or the inclusion of highly reactive and oxidizing chemicals, keeping the pumps running and pipes intact increases in difficulty exponentially. Some of the most corrosive and difficult to manage slurries across industrial and manufacturing industries include:

• ASTM A351 CF3M stainless steel casing (equivalent from casting to AISI 316L) + zinc anodes
• ASTM A351 CF3M stainless steel impeller (equivalent from casting to AISI 316L)
• AISI 316L stainless steel wear plate(s)
• Stainless steel shaft SAF
• Silicon Carbide / Silicon Carbide mechanical seal
• FKM Elastomers

The use of zinc anodes on the covers of the pump casing reduces galvanic corrosion of the casing when handling salty and brackish water.

Regardless of metallurgy, on request, the entire J range can include PTFE elastomers, a fluorinated material highly resistant to any type of chemically aggressive agent, except for molten alkaline metals and fluorine at high temperatures and pressures.

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