ANSI B16.9 covers overall dimensions, tolerances, ratings, testing, and markings for wrought factory-made butt-welding fittings in sizes NPS 1/2 through 48 (DN 15 through 1200). We manufacture a wide range of vessel heads to works standards, both for construction purposes and as dished vessel heads in the form of torispherical heads, elliptical heads and caps for pressure applications. DISDHED PLATES HEADS TORISPHERICAL HEADS VESSEL HEADS d And if a central hole is needed for connections, this can also be provided. lifting and handling of a Pressure vessel Vessels used to store liquids at low pressure are normally fitted with flat end sections. This is the cheapest way of enclosing the end of a vessel. For storage of fluids at higher pressures, the ends are normally domed to reduce mechanical stresses. A number of different domed head designs are used. DISDHED PLATES Item Descrip