Pressurizing standard piping for the BPM5 rocket engine.
Published on Jan 23, 2016
Copenhagen Suborbitals have begun pressure forming of standard sized tubes in 6 m lenght to use with the BPM-5 rocket engine. The BPM-5 was not designed to use standard sized piping. In hindsight this was a mistake, since welding these specialized tubes for the BPM-5 by our supplier is quite cumbersome and time consuming. We therefore decided to try hydro forming standard sized piping instead so it can be used for the BPM-5. We are using about 85 bars of water pressure to go from the standard size of 108 mm (outer tube) to 112,3 mm and 101,6 to a 104,5 mm (inner tube). So far it has been a great success. The hydro forming extended the size and the deformation hardened the tubing. The average size increased within 0,5 mm over 6 mm lenght.
Now the tubes have been cut to length and are ready to go to metal forming.
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