Toro Andersen at 12:20, 22 March 2026

2026-03-22T12:20:01Z

← Older revision		Revision as of 12:20, 22 March 2026
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	Due to the air output of the blower when reversing, it was possible to drive with about 80% of the torque, at least at high speeds. This should have been sufficient in all cases. The seawater and freshwater pumps built by the Kleinschanzlin-Bestenbostel company in Bremen'''''<sup>22</sup>''''' are also notable for having to be specially designed for reversing. Here, by positioning the impeller blades accordingly and by using two guide wheels and two spiral casings, it was possible to keep the pump characteristics the same for forward and backward. As it became apparent that the use of centrifugal pumps for oil extraction in ship systems had certain disadvantages, it became necessary to arrange a special feed pump for each oil pump, which fed the oil to the actual feed pump at an excess pressure. As this feed pump would also have had to be driven, either electrically or hydraulically, this resulted in considerable complications. To avoid this complication, displacement pumps were chosen for oil pumping in the new systems, including the very large engines (MZ 65/95) that will be mentioned later. The most suitable type of pump was the screw pump from Leistritz in Nuremberg. The pumps were completely silent and were also insensitive to oil containing air. They were also able to overcome a relatively high suction head safely, even with oil containing air. The pump was made reversible by installing valve flaps.		Due to the air output of the blower when reversing, it was possible to drive with about 80% of the torque, at least at high speeds. This should have been sufficient in all cases. The seawater and freshwater pumps built by the Kleinschanzlin-Bestenbostel company in Bremen'''''<sup>22</sup>''''' are also notable for having to be specially designed for reversing. Here, by positioning the impeller blades accordingly and by using two guide wheels and two spiral casings, it was possible to keep the pump characteristics the same for forward and backward. As it became apparent that the use of centrifugal pumps for oil extraction in ship systems had certain disadvantages, it became necessary to arrange a special feed pump for each oil pump, which fed the oil to the actual feed pump at an excess pressure. As this feed pump would also have had to be driven, either electrically or hydraulically, this resulted in considerable complications. To avoid this complication, displacement pumps were chosen for oil pumping in the new systems, including the very large engines (MZ 65/95) that will be mentioned later. The most suitable type of pump was the screw pump from Leistritz in Nuremberg. The pumps were completely silent and were also insensitive to oil containing air. They were also able to overcome a relatively high suction head safely, even with oil containing air. The pump was made reversible by installing valve flaps.
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Toro Andersen: Created page with " By Ferdinand Brandes Machine translated by Google Experiences of the former German Navy in the development of high-speed speedboat engines and the double-acting two-stroke engines of MAN == Preliminary remark == Ferdinand Brandes worked until 1944 as a ministerial director in the design office of the German Navy, in a position comparable to that of chief mechanical engineer in the design office of the Imperial Navy. In this position he had a significant influence on..."

2025-02-01T20:38:56Z

Created page with " By Ferdinand Brandes Machine translated by Google Experiences of the former German Navy in the development of high-speed speedboat engines and the double-acting two-stroke engines of MAN == Preliminary remark == Ferdinand Brandes worked until 1944 as a ministerial director in the design office of the German Navy, in a position comparable to that of chief mechanical engineer in the design office of the Imperial Navy. In this position he had a significant influence on..."

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Two stoke engines of MAN - Revision history

Toro Andersen at 12:20, 22 March 2026