CHARLES ROSS & SON CO.: Custom-fabricated 185-gallon melt kettles are rated for full vacuum and 250 ºF. Each hemispherical vessel is jacketed for 15 psi steam. A submerged steam calandria is also supplied for additional heating. Both the vessel and jacket are constructed in accordance with ASME Section VIII Division I. The kettles are agitated by a two-wing anchor driven by an explosion-proof motor. Special mechanical seals, level sensors, actuated diaphragm discharge valves, electrical controls and alarm panels are also provided.