WITSML - Rig Centrifuge Component Schema Manufacturer / supplier of the item. Manufacturers designated model. Date and time of installation. Removal date and time. Description for the type of object. Maximum pump rate at which the unit will efficiently operate. Contractor/owner. An identification tag for the centrifuge. A serial number is a type of identification tag however some tags contain many pieces of information. This structure just identifies the tag and does not describe the contents. Unique identifier for the centrifuge.