Nozzle flanges shall be in accordance with ANSI B16.5. All butt weld end connections shall project a minimum of 150 mm from the outside of the tank.
Threaded-type flanges shall not be used. Threaded connections shall be ANSI Class 3000 forged couplings.
Socket-welding connections shall be in accordance with ANSI B16.11.
Internal piping shall be located and supported to provide for necessary expansion and construction. Internal piping shall be bolted to supports to permit easy replacement. Removable internal parts shall be designed so that they can be withdrawn from the tank through the nearest manhole or opening.
Over flow pipe shall be provided and constructed from steel pipe. The discharge end of the pipe shall be provided with an elbow and flap valve. Overflow piping shall be rigidly supported and braced from the tank wall at intervals not exceeding 2 meters. Piping shall be adequately supported and braced for weight, expansion or construction, and hydraulic forces