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Wednesday, August 27, 2014

Ultra-Compact Diaphragm Pump Yields Efficiency Benefits in Metering

Diagram of ProMinent's Zentriplex diaphragm pump shows space savings versus a standard triplex pump.

Compared with a standard triplex pump…

The global process industry is constantly on the lookout for equipment solutions that reduce footprint but offer equivalent or better performance. This comes particularly handy when plant operators may want to retrofit their pump equipment within the confines of existing mechanical infrastructure.

The Zentriplex oscillating multicylinder process diaphragm pump from ProMinent Dosiertechnik GmbH, based in Heidelberg, Germany, is one such solution making waves on both sides of the Atlantic. In the U.S., ProMinent Fluid Controls Inc. is based in Pittsburgh.

The Zentriplex pump reportedly incorporates a number of features, including the key benefits and advantages of ultra-compact dimensions, low weight, and energy efficiency. In a nutshell, the Zentriplex is a process pump that produces high outputs and efficiency rates with minimal floor space requirements and is suitable as a drop-in for standard process pumps within the performance level (delivery rate and delivery pressure) attainable, says ProMinent spokesperson Martin Birmelin.

Diagram of ProMinent's Zentriplex diaphragm pump shows space savings versus a standard triplex pump.

…ProMinent’s Zentriplex pump shows space savings.

“We are breaking new ground by deviating from the conventional construction of pumps and designing the drive in a completely new way,” says Birmelin. “The diaphragm dosing heads and hydraulic ends are arranged in a star shape around a drive mechanism, thereby minimizing stresses and loads.” The three liquid ends operate with a 120-deg phase offset.

The pump is capable of achieving higher pressures and capacities with significantly less material and lower drive outputs due to its compact size.

Further, multilayer safety diaphragms ensure leakage-free metering. The Zentriplex is also versatile on account of its modular construction with the gear motor, hydraulics/drive mechanicals, and liquid end. The liquid end and drive unit are assembled on top of each other to save space and ensure that the Zentriplex can be used in confined spaces.

A further key benefit over traditional pump designs only becomes apparent upon diaphragm replacement time, according to Birmelin. Enabling ultra-short down times, the pump “rates highly” in this area. The diaphragms can be replaced without the need to dismantle the suction and discharge lines and all other components, such as the bleed valve, filling valve, and pressure control valve, all of which are “very easy to access,” he says.

ProMinent Zentriplex, whose pump heads are arranged in star configuration.

ProMinent Zentriplex, whose pump heads are arranged in star configuration.

Moreover, the drive mechanism requires considerably less oil due to its construction, and its resistance to aggressive, corrosive, and flammable media ensures process safety.

The Zentriplex complies with the American Petroleum Institute standard API 674 for oil and gas reciprocating pumps and is equipped with polytetrafluoroethylene (Teflon) multilayer diaphragms and integrated relief valves. Further, only two connections need to be made by the user for the suction and pressure sides, respectively, versus a total of six connections for a standard triplex pump. The collecting line is integrated in the pump.

There is virtually no limitation on the size of the pump heads, according to ProMinent, and additional advantages compared with standard triplex diaphragm pumps are minimal heating of the drive unit (standard mineral oil is sufficient for cooling) and low delivery-flow pulsation.

The pump is also suited to low-speed operation, with a frequency converter allowing for a wide control range. The applicable pumping range is 780 to 6,000 L/hr at back pressure levels of 367 to 47 bar.

The Zentriplex can be used in the petrochemical industry or as a specialized metering pump in other process industries. In the oil and gas industry, it is ideal for metering a range of chemicals at the drilling hole, as well as on oil platforms for the metering of inhibitors, methanol, or additives. In refineries, it is used to meter inhibitors, drag reducers, additives, catalysts, and dyes.


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