Rig floor equipment: Electric motors drive 2,000 hp mud pumps ///

When the world’s two largest semisubmersible rigs, Aker H6 design, come in to operation in 2008, they will be equipped with the biggest mud pumps ever installed on one rig. The pumps are of triplex-design, and each has a 2,000 hp rating. Four pumps will be installed on each rig, giving a full pumping capacity of 8,000 hp. The pump package has a total weight of 200 t per rig and the height is four meters. They will be speed-controlled by frequency converters via specially-designed electric motors from Schorch in Germany. These EExe motors are watercooled, double shafted and have a special arrangement for insulating the motor bearings to avoid current damage from the PWM-type inverters. According to Hallvard Slettevoll, director of Schorch Norge, Schorch now makes electric motors as large as 25 MW and up to 15 kV in voltage, and in the EExd motor up to more than 10 MW.

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