Production • Processing • Handling
Fig. 2. The NETZSCH multiphase pump conveys up to 160 m³ crude oil, water, solids and gas per hour. The different components do not have to be separated in advance.
operating company therefore decided to switch to a special multiphase pump to transport their crude oil.
Precise dosing Most pumps are either suitable for solids or for gases, depending on their design. Progressing cavity pumps, on the other hand, can handle all combinations.
conveyed in precisely dosed portions with low pulsation and irrespective of its consistency. Te specific design of the pump is adapted to the specific application. Tat means that the materials for the housing, gaskets, stator and rotor are selected for the anticipated conditions, and the precise configurations of the parts are adjusted to match. Te multiphase pumps can be operated reliably and at stable pressure even with a high-water content and a gas content of up to 90 per cent under this specification.
Te technology is based on the principle of displacement. Te medium moves from the suction housing to the conveying elements - the stator and the rotor.
Te helical rotor rotates regularly inside the fixed
stator creating closed conveying chambers between the two matched segments. Te medium in these chambers is moved continuously from the suction side to the pressure side by the movement of the rotor. Te mixture to be transported is therefore
Fig. 4. A system with quench supply was installed to prevent damage to the gaskets from dry running during phases when gas is conveyed.
As a lot of gas was frequently present in the oil mixture in Central Asia, there was a danger that the sealing surfaces of the mechanical seal could occasionally run dry and break. To prevent that, the engineers installed a system with a quench supply. A 5-litre tank with rinsing fluid ensures that the sealing material is always lubricated, and prevents increased wear and tear. As any sealing lip attached externally would have been exposed to low minus temperatures without protection, a double-acting mechanical seal was used instead. Tis robust design increases the working life and reduces the need for maintenance - an important consideration in terms of operational reliability at the isolated location.
Fig. 3. As temperatures can fall as low as -40°C in winter, the materials and components of the pump had to be selected specifically for this extreme climate.
Resistant materials Te temperature gradient in the middle of the Eurasian continental plate is particularly dramatic as a result of the inner-continental climate. In summer,
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