Design criteria ve operating condition
Mechanical engineering process veya utility duty, capacity, pressure/temperature condition, fluid property, material, redundancy ve maintainability requirement ile başlar. Bunlar equipment selection, piping class, HVAC criteria ve utility distribution philosophy'yi belirler.
Existing-system tie-in ve operational constraint'ler erken belirlenir; shutdown window ve live-plant interface construction stratejisini belirleyebilir.
