These products are more than 2 meters in diameter with wall thickness of 75 mm are used for the manufacture of ball valves for gas mains.
After fabrication of the hemisphere are sent to the Tula region, on Alexinsky plant JSC "Tyazhpromarmatura" where they are welded to the scope and perform further machining.
Work on this type of product on the (Included in the Engineering Division of Rosatom — AtomEnergoMash) began in 2010. Since 2012 uses a new manufacturing technology: now experienced the blank is not made from two sheets by welding, and from a single sheet of metal.
To date, the production of the hemispheres to "Petrozavodskmash" mastered and put on stream. From January to October 2012 at the factory stamped over 300 hemispheres, to the end of the year the number could reach 450 units. Preliminary application for next year — at least 500 pieces.