METHOD FOR PROVIDING A THREADED FITTING IN A WATER TANK HEADER, HEADER PRODUCED BY THE METHOD AND WATER TANK INCLUDING THE HEADER

摘要

The method is for producing a header from a steel blank, the header having a boss and being of the type that is welded in use to a cylindrical wall to produce a hot water tank subassembly, the boss being interiorly threaded to define a threaded pressure vessel connection. The method comprises the steps of extruding the boss in the steel blank and tapping the thread.