Process Equipment and Parts Thereof, Marketed Mainly to the Chemical, Pharmaceutical, and Oil Refining Industries, and Comprised of Burst Discs which Are Used as a Safety Release Device on Process Pressure Vessels; Centrifugal Pumps, for the Pumping of Mainly Corrosive Fluids; Heat Exchangers for the Handling of Corrosive Fluids for the Interchange of Heat, Such as, Cooling, Heating, Evaporation or Condensation