Introduction: 15MBD marine vacuum systems reduce water consumption by 85% and maintain 6-8 m/s velocities for reliable wastewater transport.   1.The Shift from Gravity Networks to Vacuum Sewage Engineering The marine industry faces escalating pressures to optimize vessel weight, reduce water consumption, and maintain strict hygienic standards. For decades, naval architects relied on traditional gravity-based toilet networks. These legacy infrastructures currently exhibit severe operational bottlenecks, including excessive water consumption, recurrent blockage incidents, and accelerated pipe corrosion. Modern vessel design dictates a paradigm shift toward active pneumatic transport mechanisms. 1.1 The Operational Cost of Legacy Gravity Systems Gravity-reliant networks demand large-diameter piping installed with continuous downward slopes. This rigid architectural requirement consumes critical deck space and severely limits cabin layout flexibility. Furthermore, gravity ...