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Precision Boilers – Model SP-DA Spray Deaerator

Capacities: 140 to 6,000 Gallons
Pressures: 50 PSI
Steam Lb/Hour: 5,000 to 300,000 PPH



Deaerators (DAs) are recommended when the steam system requires significant volumes of make-up water that must be treated to remove free oxygen and carbon dioxide from boiler feedwater. Precision Boilers’ spray deaerator relies on internal spray valves, a vent condenser, and fresh steam to allow the make-up water to release the O2 and CO2 naturally. This eliminates the need to rely on costly oxygen-scavenging chemicals to prevent corrosion leading and premature steam system failure.

How It Works:

The feedwater storage tank is equipped with internal stainless steel vent condenser and spray valves that release free O2 and CO2 from the make-up water supply as it enters the tank. A pan collects the treated make-up and any condensate returns, which are then drained via an internal downcomer. An internally mounted the scrubber pot receives boiler supplied steam and uses its latent heat to scrub O2 and CO2 from the make-up and condensate. In the end, all O2 in excess of 0.005 cc/liter is removed, and titratable free CO2 levels are reduced to zero.


Spray deaerators be configured for either intermittent duty (on-off) or continuous-run with recirculation loop. For more precise modulation, a Variable Frequency Drive control can be used for ease, efficiency and energy savings. We also offer solenoid or air actuated valves with proportional control features for more precise level control

Features & Benefits:

  • Deaerator and storage vessels are 50 psi design and fabricated to include 1/16-in corrosion allowance
  • Mounted on a structural steel stand with pumps mounted on the base
  • Pre-piped and pre-wired prior to shipment (pump NPSH requirement determines stand height)
  • Float activated make-up water valve adds fresh water to replace condensate lost through the steam loop
  • The DA float assembly is externally mounted, typically sharing the sight-glass water column
  • Control panel mounted on the stand contains fused magnetic starters, switches, lights, alarms, and controls


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