EngNet » Product & Service News » HDM - Heavy Duty Mining

HDM - Heavy Duty Mining

Product News Monday, September 14, 2009: RITZ Pumps South Africa (Pty) Ltd

With HDM, two contra-rotating submersible motor pumps are arranged on top of each other and driven by a continuous pump shaft. The suction branches of the two pumps are located at the ends of the HDM module.

Each of the two pumps transports half the capacity to the middle of the pump at full pressure. There, a deviating stage directs the flow to the pressure line via the external casing channels.

The double-suction design completely compensates the axial thrust. Loads on the unit are kept to a minimum and the thrust bearing is no longer subjected to tonnes of thrust.

This significantly reduces wear and tear, increasing service life to up to 20 years or more.

The division of work between the two pumps not only achieves complete compensation of axial thrust, it also halves the suction velocity outside the pump. This protects the well walls around the intake openings and minimises the intake of abrasive solids and silt.

There is an even more compelling benefit: With half the delivery flow going to each pump, smaller impeller intake crosssections are possible and therefore lower circumferential velocity in the seal gaps.

Every pump featuring HDM is a one-off. They are tailor-made from standard modules for your specific application.

Hydraulics module. The optimum combination of impeller, diffuser and casing leads to best adaptation to the desired operating point at extremely high efficiency.

Material module. A choice of materials enables flexible adaptation to suit your operating conditions.

Motor module. Each HDM features a heavy duty motor specially adapted to power usage of up to 14,000 volts. This minimises both the cross-sections for energy transmission and transmission losses.

Cooling module. Here the MC-T – Modular Cooling Technology – is deployed. It can be configured to suit any requirement. Complete information is available in our brochure “MC-T – Modular Cooling Technology”, which we would be happy to send you on request.

Key benefits – an overview:

• Maximum operational reliability. The lower the load on the unit from axial thrust and drawn-in solids and silt, the higher the operational reliability.
   
• Long service life. The higher the operational reliability, the longer the service life. For submersible motor pumps featuring HDM that can be 20 years or more.
   
• High cost-effectiveness. The longer the service life and the higher the efficiency (up to 90 %-plus), the lower the operating costs.