Specific sizing calculations and details like nozzle design, configuration etc. are critical and normally not shared by the Equipment Manufactrers. Process Engineers engaged in any operating plant or even involved in basic design, prepare purchase specification for vendor's supplied equipment which requires fundamental inputs like Process Flow Diagram, P&ID, Flow Rates and other operating conditions, preferred plot plan, based on space availability. This set of infomation is usually sufficient for any vendor to provide budgetary quotes for us to proceed with project cost estimation. I am not sure such curitical design information enabling you to design any equipment in-house is available in any textbook.
To answer your questions related to sizing,
1. Sizing of the Storage Tank though depends on a number of factors, many design practices at owner's facility or process design center suggest not less than 20 minutes of hold up between maximum overflow and minimum level alarm point after which the feedwater pump trips.
2. Steam flow requirements can be calculated as follows
Steam Flow Kg/h = Water Flow x (Enthalpy of Water at outlet - Enthalpy of Water at Deaerator Inlet)/(Enthalpy of Steam - Enthalpy of Water at Outlet)
Water Flow is the sum of maximum boiler output and blow down
Water temperature at the outlet depends on the deaerator pressure where water remains on saturation
3. Feed Water Flow Rate. Boiler maximum steam output plus a suitable design margin
Hope the above would be helpful
