Germany-based NETZSCH manufactures cavity oil pumps to efficiently convey highly viscous oils at above 50,000 mPas
NETZSCH pumps convey oil while maintaining stable pressure levels, with no pulsation or shear forces, the company said.
As the body of the progressing cavity pump is comparatively slim, it is perfectly suited to the interior of bore holes, with a variety of drive heads available for different performance and speed requirements to generate the torque above ground, the company claimed.
The vertical GH drive comes with 20 to 100 horsepower (HP) and 3,400 Newton metres (Nm) torque and is specially designed for large loads and rotation reduction of 1:4, NETZSCH said.
The right-angled RH version, on the other hand, is used for low pump speeds and can be connected to a combustion or hydraulic motor thanks to its particular geometry, it said.
The highly economical DH direct drive is the option for higher rotation speeds up to 500 rpm, NETZSCH added.
The standard NTZ model meanwhile has low-life cycle costs thanks to its small number of wearing parts and is suitable for oil mixtures with up to 40 per cent gas or sand content at up to 160°C. The NTZ model can achieve conveyance rates of between 0.5 and 300 cubic metres (cu m) per day at a maximum pressure rating of 300 bar, the company said.
According to NETZSCH, the NTU pump series is designed to focus on low start and operating torques and low interference from temperature or chemicals, NETZSCH explained. The steel housing of the spiral form of the inner elastomer stator has been adapted for this purpose, so that the rubber walling is of equal strength throughout and also swells and shrinks evenly, it said.
Finally, the NSPCP for directional and horizontal bores - a deep well submersible pump that does not require an above-ground drive, but operates instead with an attached upstream submersible motor, which draws energy from a power cable. Long transmission rods are therefore not needed, NETZSCH said
The metal and elastomer materials used within the range are selected to match the anticipated conditions for all types of pump to keep wear from the medium to a minimum while simultaneously creating optimal conditions for conveying, according to the company.
Temperature and density are taken into account, as well as the relative content of water, natural gas and hydrogen sulphide; this approach not only increases the performance of the systems, but also ensures a long service life and long maintenance intervals, NETZSCH concluded.
