Safe Delivery of Ammonium Nitrate Emulsion:

NEMO® SY Progressing Cavity Pump Accelerates Delivery to Mining Customers

Due to their significantly longer service life, NEMO® progressing cavity pumps accelerate the supply of a ready-to-use ammonium nitrate emulsion to mining operations and increase the service life of the unit as well as the throughput capacity of the entire system. 

High safety during the transport of “volatile” explosives is one of the challenges in mining.

Look behind the scenes

Safety in mining and at construction sites where explosives are used was a problem for a long time, because the storage and transport of “volatile” explosives always constitute an enormous risk. In order to reduce the danger and achieve a better explosive performance, there has for some time been greater use of pumpable emulsion explosives.  

Challenge accepted 

A global explosives manufacturer had used a progressing cavity pump to fill the storage silos with the ready-to-use ammonium nitrate emulsion. However, the pump did not provide the required level of performance and delayed the supplying of the mines and customers due to regular breakdowns. The pin joint could not withstand the torque nor the deflection on the coupling rod and therefore often failed. The shortness of the coupling rod increased the angle which the joint had to compensate. That not only increased the stress on the joint itself, but also the dynamic load on its seal system. The lubricating effect of the lubricant used for the pin joint was not sufficient either. As a result, the pump was constantly breaking down. Since the pump had a crucial role to play in the process chain, every breakdown led to costly delivery delays.  

Excellently solved

In order to increase the service life for the application and the throughput rate of the whole system, the emulsion manufacturer searched for a more reliable pump with a larger capacity and found NETZSCH. Mining specialist Tyron Adam proposed a NEMO® progressing cavity pump for the job. It is ideally suited for ammonium nitrate emulsion, because consistency and viscosity of the medium are insignificant in terms of the product flow. At this application the NEMO® progressing cavity pump was also fitted with the NEMO® V-pin joint, that is filled with oil in order to achieve a long service life. To increase the lifetime of the pin joint even in the toughest operating conditions, it also has hardened bushes. These are pressed into the boreholes of the coupling rod and the rotor head or drive shaft head and can be particularly easily replaced during maintenance work.

For reasons of safety, the pump was not fitted with a single mechanical seal with pressure-free quenching: To further increase process reliability and minimise risk of product crystalizing between seal faces, a double-acting ASSEAL mechanical seal with thermosiphon vessels was used. In addition, the installation of a variable speed control enables the manufacturer to implement a control concept which provides for adjusting the conveying speed of the pump to the specific quantity of emulsion which is available for filling the storage tanks. This process optimization allows a considerable reduction of the number of pump starts during a shift, which significantly increases the service life of the pump. Since March 2013 the NEMO® pump has been running trouble-free.

NEMO® SY progressing cavity pump

  • Medium: Ammonium nitrate emulsion
  • Temperature: 50 °C
  • Viscosity: 18.000 to 22.000 mPas
  • Rotations speed: 189 rpm
  • Throughput volume: 48 m³/h
  • Pressure: 9 bar

You may also be interested in:

NEMO® SY modelo industrial con estructura de caja de rodamientos y extremo de eje libre

La bomba de tornillo excéntrico NEMO® SY se utiliza en todo el mundo para aplicaciones exigentes en todos los sectores de la industria. Con estructura de caja de rodamientos y extremo de eje libre, la bomba puede accionarse con todo tipo de accionamientos, como por ejemplo, servomotores, motores diésel o accionamientos hidráulicos.

Bomba NEMO® BY

La bomba de tornillo excéntrico NEMO® BY puede utilizarse en todos los sectores de la industria, allí donde deben bombearse fluidos muy diversos o deben dosificarse con mucha precisión.

Bomba NEMO® C.Pro

La bomba dosificadora NEMO® C.Pro es una bomba totalmente sintética para la dosificación precisa de los más diversos productos químicos en las áreas de la tecnología ambiental y la industria química.

Bombas de lobulares TORNADO® T2

La bomba lobular TORNADO® es una bomba rotativa de desplazamiento positivo. El caudal es generado por elementos de transporte que giran en sentido opuesto entre sí dentro de una cámara (cuerpo de la bomba). El líquido bombeado es desplazado dentro del cuerpo de la bomba por los elementos de bombeo desde el lado de aspiración hacia el lado de impulsión.