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New line of explosion-proof pumps from Tsurumi

September 29, 2020  By Tsurumi

Tsurumi America launched the Avant Series, a new line of submersible, explosion-proof pumps for a wide range of wastewater applications. Released earlier this year in Asia, the series now makes its debut in North America, expanding Tsurumi’s product offering in the region.

The new Avant Series was certified in accordance with FM Global explosion-proof specifications to ensure products conform to the highest standards of safety. These pumps feature a modern design and IE3 premium efficiency motors that deliver high performances and withstand continuous duty cycles. They have an exclusive closed-circuit cooling system, utilizing a water-glycol mixture, which prevents contamination of the system while cooling the motor. Customers will be able to order tailor-made Avant pumps from the factory, with specific configurations that match the demands of their jobs while boosting results.

“We are very proud to bring the new Avant Series to North America, as these modern, explosion-proof pumps will deliver efficiency and ensure energy savings on a number of projects in the wastewater industry, such as sewage collection from commercial buildings and municipal systems,” said Glenn Wieczorek, managing director at Tsurumi. “It’s also exciting to give our customers the opportunity to build the exact pump they need: with a specific paint thickness or control panel type, for example, or a trimmed impeller to fit an exact duty point.”

Named MQ, the new line of Avant pumps has five different types of impellers — Open Channel (MQB), Chopper (MQC), Vortex (MQU), Grinder (MQG) and High Head (MQS). It also offers wide ranges of specifications featuring 2 to 16-inch discharge bore diameters and 4 to 215 HP motor output specifications.


One of the options for this new product line is a new coating material called Molib-tech, which is an alternative to the conventional ceramic coating process and particularly suitable for preventing serious wear due to abrasion or cavitation on impellers, suction flanges and volutes. It applies a layer of high-strength material to the iron, to improve the pump’s durability.

Cooling system

The new Avant pump series is offered in wet (submersible) and dry pit versions. In the dry pit versions, the motor is cooled by a system exclusive to Tsurumi that uses a water-glycol mix circulating in a special closed loop circuit. An important advantage of the closed system is that it keeps the cooling mix separate from the wastewater in which the pump is immersed. On the Avant pumps, the mechanical seals are installed in an oil chamber separated from the cooling system and can be changed without draining the system.

“If the primary seal on a conventional pump cooling system fails, it can get completely contaminated, which will damage the pump,” Wieczorek explained. “The new cooling system on the Avant Series offers an extra layer of protection to the pump, as the glycol mix runs in a different path. That makes the cooling system more reliable and efficient.”

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