A split pressure vessel for processing of two flows encountered with energy exchange devices, consisting of two opposite facing end caps 1, 2 having each a side port for low pressure 3, 5 and one axial port 4, 6 preferably in the same plane as the side ports. Each end cap has internal structurally integrated manifolds for high pressure 17, 22 and low pressure manifold 19, 24 connect-circulation pump or booster 26 having a submersible or external motor.
