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Bomda de Tornillo is a type of positive displacement pump which is used for feeding decanter centrifuge. Sometimes when centrifuge is installed on a high stand, Bomba de tornillo is installed under the stand. When centrifuge is installed on a mud tank, it is installed on the skid of the mud tank. See the photo below. 
Nemo pump is the most world famous pump for centrifuge, and you do not have to import spare parts if there is a distributor of Nemo pump in your country. You can buy it locally when rotor or stator is broken.