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Dosing Pump

Dosing Done Differently: Pump Efficiency is Energy Efficiency

| Author / Editor: Paul Davis* / Dominik Stephan

Favourable Feedback

Positives included ‘high pressure capability, tunable low-flow rate, solvent resistance, and low pulsation, with no requirement for a dampener.’ Also noted with approval is that the design is ‘open’, meaning that when the MT8 is shut down, both ports stay open for functions such as internal cleaning. The MT8 is already in service in the USA, Europe and the Far East on various applications. They include catalyst injection, replacing plunger pumps in a poly­urethane process and the application of additives to natural fibres in the creation of roofing materials.

At Kansas City Power & Light in the USA, a formal field test transposed into a permanent installation. The MT8, on boiler feed service, runs at 186 bar with flow rates between 13.2 and 22.7 l/h. When the initial six month trial was completed, the power station was reluctant to return the pump, even though at three months it had become noisy and flow rate was down. The plant simply increased speed to compensate. Investigation later explained the pump’s behaviour: a partially blocked filter ahead of the suction inlet had caused cavitation. However, the pump was protected by its many design features.

A plant engineer at KCP&L reported: “We used the MT8 to add phosphate solution to our boiler drum. It works great. We don’t have any issues with it. Other pumps were having issues overcoming drum pressure, but the Hydra-Cell pump has no problem. The line restriction did not affect the ability of the MT8 to produce the amount of pressure needed to pump into the drum.” KCP&L later confirmed their satisfaction, buying several more MT8 pumps and control units.

Dosing Pumps Can Do More than Just Metering

Metering is not the only active element in Wanner’s pump development programme. In recent years the company has continued major expansion of its high-horsepower process pump ranges. In 2014 a new T100 Series model was introduced (flows to 366 l/min, pressures up to 345 bar). In 2016 the new 2-model Q Series of quintuplex pumps was launched. These pumps feature five diaphragms in a single head giving exceptionally smooth flow at rates up to 595 l/min and 103 bar and 246 l/min and 241 bar. The latest high-horsepower pump from this manufacturer is the T200 — two models, rated respectively for operating at pressures up to 207 and 241 bar, and max flows of 420 and 322 l/min.

In terms of flow and pressure they are the highest performing pumps in the Hydra-Cell range, and they share its distinctive features including low energy consumption in relation to performance. For every increase in flow and pressure capacity coupled with the challenges of constantly looking to reduce operational costs, energy requirement becomes even more critical to consider! Field testing of the T200, initially on oil industry applications, is near completion. In fact, the company states to have the pump already on display at Achema 2018.

* * The author is Managing Director at Wanner International, Church Crookham/England.

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