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Boiler Deaerator Mass & Heat Balance Calculator engineering
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Boiler Deaerator Mass & Heat Balance Calculator

Model deaerator pegging steam demand, mixed feedwater temperature, incoming makeup flow, and ASME storage tank retention volume.

Boiler Feedwater Demands

Pegging Steam Supply & Storage Retention

Deaerator Heat & Mass Balance

Pegging Steam Required
-- lbs/hr
-- % of boiler output
DA Saturation Temp
-- °F
at vessel operating pressure
Mixed Inlet Water Temp
-- °F
before deaerator spray/tray
Fresh Makeup Demand
-- lbs/hr
-- GPM

Feedwater Storage Tank Sizing

Net Usable Water Capacity: -- Gallons
Recommended Gross Tank Volume: -- Gallons
Vessel Gross Volume (cu ft): -- cu ft
Dissolved O2 Guarantee: ≤ 7 ppb (0.005 cc/L)

Engineering Operating Notes

Operating a pressurized deaerator at 5.0 psig (227°F) reduces oxygen solubility to zero, eliminating pitting corrosion in economizers and boiler drums. Ensure non-condensable vent plume is visible (approx. 12-18 inches) to guarantee continuous stripping of liberated O2 and CO2.

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Frequently Asked Questions

What is the primary function of an industrial boiler deaerator?

A deaerator removes non-condensable corrosive gases—primarily dissolved oxygen (O2) and carbon dioxide (CO2)—from boiler feedwater. Unmitigated oxygen in hot feedwater causes rapid pitting corrosion that can perforate boiler tubes and economizers in a matter of months.

Why are deaerators typically operated at 5 psig pressure?

At 5 psig, the saturation temperature of water is 227.1°F. Operating above atmospheric pressure prevents air infiltration into the vessel and ensures that Henry's Law drives the solubility of dissolved oxygen down to zero (achieving the ASME standard guarantee of 7 parts per billion or 0.005 cc/liter).

What is pegging steam in deaerator operation?

Pegging steam is live steam injected directly into the deaerator heating section (either via sparge pipes or internal trays) to maintain operating saturation pressure and rapidly heat cold incoming makeup water.

Why is storage retention time of 10 to 15 minutes required in the tank?

The storage section provides an operational safety buffer. In the event of a sudden water treatment feed disruption or condensate return pump trip, 10 to 15 minutes of water supply gives plant operators sufficient time to switch pumps or safely ramp down boilers without catastrophic low-water trips.