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SPECIALIST EQUIPMENT


ROBUST JOINTS LONGER SERVICE LIFE


mean


Tyron Adam reveals how progressing cavity pumps speed up the delivery of ammonium nitrate emulsion in mining applications


S


afety 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. To reduce the danger and achieve a better explosive performance, there has for some time been greater use of pumpable emulsion explosives. Since the year 2000, a global explosives manufacturer had been using a progressing cavity pump to fi ll storage silos with the ready-to-use NH4NO3 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. T e pin joint could not withstand the torque nor the defl ection on the coupling rod and therefore often failed. T e shortness of the coupling rod also increased the angle for which the joint had to compensate. T at not only increased the stress on the joint itself, but also the dynamic load on its seal system. T e lubricating eff ect of the lubricant used for the pin joint was not suffi cient either. Since the pump had a crucial role to play in the process chain and every breakdown


led to increased cost and delivery delays, the emulsion manufacturer searched for a more reliable pump with a larger capacity and found Netzsch. T e company’s mining specialists proposed a Nemo progressing cavity pump for the job. Due to the special displacement principle allowing smooth conveyance with little shearing eff ect and pulsation, this type of pump is particularly well suited to this application. T e consistency and


viscosity of the medium are insignifi cant here


in terms of the product fl ow. It is


therefore ideally suited for ammonium nitrate emulsion, which has a temperature of 50°C and a viscosity of 18,000-22,000 mPa-s.


More reliability through V-joint Instead of being fi tted with the standard version – the B-Universal model – the progressing cavity pump was also fi tted with the Nemo V-pin joint. To achieve a long service life, it is fi lled with oil and also encapsulated using the Nemo SM sealing collar. To increase the service life of the pin joint even in the toughest operating conditions, it also has hardened bushes, in contrast to the B-model. T ese are pressed into the boreholes of the coupling rod and the rotor head or drive shaft head and can be easily replaced during maintenance work. Because the NH4NO3 manufacturer had problems with the previous pump involving the coupling rod joints, it wanted to have the option of also being able to replace the wear bushings when there is major stress or high maintenance intensity. However, this turned out not to be necessary. T e pump proved to be extremely reliable. ●


A Nemo BY progressing cavity pump is used to fi ll the tanks with ammonium nitrate emulsion


44 www.engineerlive.com Tyron Adam is with Netzsch. www.netzsch.com


The pump was fi tted with a strong Nemo V-pin joint with hardened bushes, which also simplifi es maintenance


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