Correctly sizing a fire protection tank is critical to meeting NFPA 22 standards and ensuring adequate water availability during an emergency. Tank size is typically determined by required fire flow, system demand duration, and refill capabilities. Engineers must consider factors like the occupancy hazard classification, distance from municipal water sources, and pump capacity. Always consult local fire codes and AHJs (Authorities Having Jurisdiction) when finalizing specs.
For years I've had to listen to my pump system manufacturer tell me that their systems work great without pressure tanks. All the while, having to supply pressure tanks on almost every system, in order to make the work correctly. Now I can finally tell you the truth: you need a pressure tank with a booster system! Your alternative is high pressure swings or wasted energy.