Nozzle projection height should be as short as possible.  Ideally, the mounting flange should be positioned below the external thermal management system (weather shield), keeping the temperature of the nozzle closer to that of the vessel shell design temperature. It is recommended that the weather shield be fabricated in a manner to cover or surround the nozzle and flange with removable panels to gain access to the mounting flange whenever necessary. A 6.0" (152 mm) nozzle projection is ideal.