Marine Boiler Feedwater Pump, Hotwell & Deaerator Capacity Tool
Boiler Feed Demand • Pump Head & Power • Hotwell Reserve • Deaerator Throughput • NPSH • N+1 Capacity • Condensate Recovery • Makeup Water
Marine Boiler Feedwater Pump, Hotwell & Deaerator Capacity Tool
Size and stress-test the boiler feedwater support chain from condensate return and hotwell inventory through deaeration and high-pressure feed pumping. Simple mode gives a fast duty screen. Advanced adds multiple boilers and pumps, deaerator heat balance, NPSH, N+1 capacity, reserve-water endurance and operating scenarios.
↑
Fast feedwater-system screen with only 9 inputs.The tool calculates required feed flow, makeup demand, pump discharge head, indicative pump power and the storage time represented by the entered hotwell and deaerator volumes. Pump efficiency is assumed at 70% in Simple mode.PumpFlow, head & power
Water balanceReturn vs makeup
StorageHotwell & DA minutes
Boiler & Feedwater Duty
kg/h actual steam production.
% of steam production, planning basis.
% of steam production returned as condensate.
°C at feed pump suction.
bar(g).
bar through control valves, economizer and piping.
m from pump suction reference to boiler feed entry.
m³ available for feedwater service.
m³ water storage volume, if fitted.
Boiler Register
Feed requirement is calculated from all active boilers. Blowdown is entered as a percentage of steam production.
| Use | Boiler | Steam kg/h | Blowdown % | Pressure bar(g) |
|---|
Feedwater Pump Register
N+1 capacity removes the largest available pump. Head and NPSH are checked independently from flow capacity.
| Use | Available? | Pump | Capacity m³/h | Head m | Efficiency % | Motor kW | NPSHr m |
|---|
Hotwell, Deaerator & Hydraulic Basis
% of steam production at baseline.
bar.
m.
m³.
%.
%.
minutes at baseline feed demand.
m³.
%.
%.
minutes at baseline feed demand.
kg/h.
bar(g).
°C.
bar(g), saturated-steam approximation.
kg/h available to deaerator.
kg steam/air mixture per tonne of feed, planning value.
m static suction head.
m water.
m above entered pump NPSHr.
% of baseline required feed flow.
Operating Scenario Register
Use this to test low condensate return, restricted makeup-water supply and higher/lower steam demand. Makeup availability is compared with the water deficit after condensate return.
| Use | Scenario | Duration h | Steam demand % | Condensate return % | Makeup available m³/h |
|---|
Feedwater Readiness Checks
Engineering boundary: this is a planning and diagnostic tool. Actual feed-pump sizing, deaerator storage, NPSH margin, water chemistry, redundancy and class acceptance must follow the vessel’s approved design, boiler/pump OEM data, flag requirements and applicable class rules.