Single chamber high pressure gas quenching vacuum furnace,double chamber and multichamber vacuum furnaces implementing the acetylene low pressure carburizing were briefly introduced.
The paper introduces single "U" groove welding procedure for stainless steel inner cylinder of multilayer high pressure vessel,opening up a new method for welding clading stainless steel vessel.
The HP-bypass system between the boiler outlet and cold reheat consists of an HP-bypass control valve, a feedwater stop valve and a water injection valve, for steam attemperation .