Upper and lower section
The upper section consists of a traditional high pressure housing geometry, managing all triaxial stresses from vertical weights, bending loads and internal differential pressure. The upper section therefore can accept a high yield grade, is machined only and require no welding.
The lower section replaces the traditional low pressure housing and is designed to manage axial and loads, with relative low exposure to differential pressure.
Material with higher carbon level is selected to better optimize for welding and load transfer to the CAN.
The upper and lower structural sections of IDS is connected by a compact flange.