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Home / Articles and Press Releases / Press Release / Aggressive Dirty Water

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Press Release

Aggressive Dirty Water

By Tsurumi Pumps

| Read Bio

Published: October 21st, 2019

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If pumps break down prematurely, it is not always related to the granular sediment in the dirty water. This will literally reduce exposed parts such as the impeller. But often the pH value of the water is the real problem.

Clear, dirty and waste water pumps are designed for pumping water with a pH value within a defined range. In clean water, the value scatters around seven on the pH scale, which ranges itself from 0 to 14. The pH value indicates whether a solution is acidic or alkaline. The following applies: the more acidic the water, the more aggressive it is to other materials. Even above the average value, oxidation prevails: free hydrogen ions attack metals, resulting in corrosion.

Rust protection misperception

Even stainless steel, usually the pump material of choice, is only conditionally immune: If the protective oxide layer is damaged, for example by notches, the rust will soon bloom. In the case of aluminium, protection only exists in the core range of 4.5 to 8.5 on the pH scale. The fact that aluminium does not rust is a frequent misapprehension. Cast iron has many advantages but offers only limited protection.

More often than assumed, the pH value of water is in the problematic range. Rough rule of thumb for deep excavation, special deep excavation and raw material mining: the deeper it goes, the more problematic. PH values down to -3.6 have already been measured for mine water. In most cases, mixed water is the cause, and this is often the case elsewhere in construction.

The pump manufacturer Tsurumi has developed its new TM series especially for these scenarios while focusing on mobility (frequent relocation). These are lightweight submersible motor pumps where all parts that come into contact with liquid are made of titanium. They effectively protect against the chemical attack of pumped media containing salt and chloride.

“in clean water, the value scatters around seven on the pH scale, which ranges itself from 0 to 14”

Titanium defies salt water

Titanium is 45 percent lighter than steel and twice as strong as aluminium. The material forms an extremely resistant oxidic protective layer, which can be less sensitive to dents, scratches and notches. Titanium is the material of choice in many applications.

The TM series currently comprises three pump types providing up to 350 litres per minute on the one hand and 15 metres head on the other. Due to the weight advantage of the titanium alloy used by Tsurumi, the pumps weigh only 7,8 kilograms dry. In addition to titanium, Tsurumi also uses GRP for secondary housing parts and ultra-hard silicon carbide for shaft seals. Like almost all pumps in the range, the TM also comes with encapsulated electrical conductors, a double inside mechanical seal and built-in motor protection.

By the way, a trick can reduce the vulnerability of many pumps: Externally mounted anode blocks made of aluminium or zinc divert the galvanic currents and thus largely discharge the corrosive attack.

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ABOUT THE AUTHOR

Tsurumi Pumps

Being water- and people-friendly

Water is essential to human life. Understanding the importance of water, Tsurumi is comitted to providing technologies for controlling an protecting it.

Mission

As the leading manufacturer of submersible pumps Tsurumi is present all over Europe. We design and manufacture high quality products for tough conditions in various dewatering applications including mining, tunnelling, construction and industrial. We provide the best service in class for our customers with maintenance friendly products that reduce costs for the users.

Vision

At Tsurumi Europe our vision is to excite all pump professionals and affiliates through our reliability in all tough conditions. As a trustworthy partner we will never stop to provide innovative solutions for our customers’ needs while exploring new applications and markets.

The Kyoto plant

Designed for increased productivity through fully integrated streamlined production systems, Tsurumi’s factory in Kyoto (Japan) features a production capacity of a full 1 million pumps per year.

Large-scale modern R&D facilties offer optimum conditions for experimenting and testing of even super-large pumps and for developing new products to expand the possibilities and applications of pumps.

To provide optimum conditions to our main asset, our workers, as well as for environment, special emphasis is placed on optimized working conditions with airconditioning, minimized dust and exhaust gas emission, comprehensive recycling and waste recovery.

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