Netzsch: Maintenance of progressing cavity pumps with minimum effort

Explosionsbild FSIPNetzsch has developed the “Full Service in Place” (FSIP) concept for pump systems – constituting an inconspicuous but essential process element in many applications. This makes interventions in the pump equipment possible without dismantling from the piping. This approach has proven itself in practice already for several years with the Tornado T2 rotary lobe pumps, and a FSIP version of the progressing cavity pump will now be introduced as well. The new design saves time on inspection, repair and cleaning work while even reducing the required installation space.

To enable implementation of the FSIP principle for a progressing cavity pump, a special inspection cover was engineered instead and integrated in the design. The cover is held by five screws that can be removed completely without special tools and in a short amount of time. Attention was given to ensuring that the cover still closes reliably, both under high pressures and vertical installation of the pump.

The maintenance opening is located where the stator connects with the pump housing. Removing the cover provides access to a two-piece clamping coupling connecting the joint on the rotor with the coupling rod. Only one screw needs to be removed here to separate the rotor-stator element from the coupling rod. The rotating unit can subsequently be simply lifted out, and the inside of the pump is freely accessible from flange to flange. As all parts are removed toward the side instead from the end of the pump, hardly any space is needed for dismantling. The previously required dismantling length is no longer an issue; the necessary installation space is therefore shortened considerably – an important factor for the usually quite long progressing cavity pumps.

Replacing parts in half the time

In addition to convenient dismantling, attention was given during the revised design so that handling of new components during their installation or re-installation of inspected parts would be as easy as possible. This normally requires some skill, strength and time. Implements such as vices or supports are even needed sometimes.

The FSIP pump, by contrast, is designed for the pump housing to act as a support and orientation scale at the same time. The special layout thus ensures that each part finds its intended location. Positioning is practically an automatic process, and the installer or operator does not need to re-adjust anything. All in all, any wearing part can be replaced in less than half the previous time. The actual delivery geometry is not changed for the “Full Service in Place” progressing cavity pump. The customary performance is thus preserved in spite of simplified maintenance; as an added benefit, conventional Nemo pumps can simply be converted to the state-of-the-art version of the FSIP pump.

The FSIP progressing cavity pumps are offered in parallel to the customary Nemo pumps from Netzsch effective immediately. In addition, already installed pumps from size NM045 can be retrofitted without a problem. Only the drive train assembly and the pertaining housing need to be replaced.

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