HVAC & Ventilation

Pressurization Systems

Sizes the system that holds a closed heating, chilled or condenser water circuit at the right pressure and tops it up when it loses water: the expansion vessel or pump / compressor pressurization unit, the full pressure ladder, the make-up set and the safety valve. BS EN 12828 Annex D is the default method, with BS 7074 and the ASHRAE handbook alongside as cross-checks. The nearest real vessel or unit is suggested from built-in Reflex and EMO BOSS catalogues, and every run exports a branded Word report and an Excel equipment schedule. Closed circuits up to 120 °C; high-temperature gas-cushion systems are out of scope.

BS EN 12828 · BS 7074 · ASHRAE HVAC Systems & Equipment

• System Designer — the whole scheme in one run: vessel or pressurization unit, pressure ladder, make-up and safety valve.
• Quick Vessel — the vessel alone, by BS EN 12828, BS 7074 or ASHRAE.
• Volume Estimator — the system water content from plant, terminals and pipework when it is not known.
• Booster Expansion Tank — the expansion tank on a pressure-boosting set, per the Reflex planning guide #6.8, within the BS EN 806-2 #15.3 frame.

Sample report

1,500 L vessel (1,394.4 L minimum)Pressurization and Expansion Vessel, EV01View the issued report

Walkthrough

1:39Pressurization Systems

Full walkthrough