Atlantic Feedwater Systems INC Text Only Page

Atlantic Feedwater Systems, Inc.

Low Cost
Easy to Install

We are sure to satisfy all of your boiler feedwater needs

We provide the following guidelines to help you (our customers) decide which type of system is best for your application. To help you select the best boiler feed system for the job, a boiler feed system is sized with five parameters in mind:
1. How much feedwater?
2. Boiler operating pressure?
3. Tank storage capacity? New or replacement tank?
4. Is feedwater heat required?
5. Is corrosion protection required?

If you have questions, or require more information, please call us at 712/243.5871.
Our job is to offer the best feedwater system for the application, considering:
• First Cost
• Energy Cost
• Water Cost
• Unit Life
• Space
• Date Needed

If time is short, we have stock units available for quick shipments. Standard horizontal feed systems are available in 3 to 4 weeks. In cases of emergency, expedited service will be provided for a nominal charge. Compact vertical feed systems are available
in 1 to 2 weeks. Several sizes are in stock and can be shipped the next business day.

Our affiliate Companies
Industrial Steam

Industrial Fuel Systems, LLC

L.E.S. Boilers

WILSON Engineering

Boiler Feedwater Systems


1. Receiver factory mounted on stand.
2. Bronze float type make-up valve.
3. Stainless steel temperature gauge.
4. Bronze water gauge cocks with 5/8″ red line gauge glass.
5. Centrifugal boiler feed pumps.
6. Suction piping including shut-off valve.
7. Magnetic starters for each pump with enclosure.
8. Hand-Off-Auto switch in each starter enclosure.

Horizontal Boiler Feedwater Systems

The AFS line of feedwater systems is available in seven sizes to fit most firetube and commercial watertube boiler applications:
Sizes are 50, 100, 200, 300, 500, 750 and 1,000 gallons of storage capacity.

• The standard packaged design is shipped complete with the pumps and pump suction piping factory installed. Most components are factory
installed to make it easier to get the boiler feedwater system installed with minimum cost and effort.

Centrifugal Boiler Feed Pumps

1. Pump size matched to tank size for easy selection.
2. Centrifugal pumps provided with all models.

Centrifugal pumps are used on all low pressure and high pressure steam units. Centrifugal pumps are more efficient than turbine type pumps, which reduces electrical use, saving money on utility bills. The centrifugal pumps also require less maintenance. Turbine pumps are available upon request.

Single stage centrifugals are used on the low pressure steam systems. (Vertical is optional.) Multistage vertical centrifugal pumps are used on the high pressure steam systems.


Many feedwater systems fail prematurely due to the corrosive effects of condensate and oxygenated make-up water. If the feedwater system experiences significant levels of make-up and steam is used for feedwater preheat in the feedwater system, a standard “carbon steel” vessel may fail prematurely.

The corrosion resistant options available are:
• 304 Stainless Steel vessel
• Duratherm lining (100 to 1,000 gallon)
• Hot Dipped Galvanized vessel

The higher the level of make-up, the greater the need for a corrosion
resistant lining.


A steam preheat assembly is recommended if the blended makeup/condensate return temperature is lower than 140F. This component includes a self contained temperature control valve, check valve, and copper sparge tube to evenly distribute the steam under the water line of the feedwater system.


Our standard feedwater systems include a starter for each pump enclosed in a common Nema 1 panel and wired to the motors. Additional options include door disconnect, control circuit transformer, alarm switches, fuse protection, alternator (for on/off operation only), UL label, and Nema 1 2/4/4x panels.


The standard feedwater systems are available in 3 to 4 weeks. If you need a system now to replace a unit which has failed or for a quick turn project, we offer expedited shipment at a nominal charge. Several sizes are in stock for quick shipment.


• Solenoid Makeup Valve
• Alarm Switches (level)
• Discharge Piping
• Chemical Quill
• 3-valve Bypass
• Bolted Stand
• Lowboy Arrangement

P5 .005 cc/liter Horizontal & Vertical Pressurized Deaerators


  • Unique spray scrubber design guarantees removal of all dissolved oxygen in excess of .005 cc/liter (7 ppb)
  • Electronic instrumentation for modulating level control includes a HART compatible differential pressure transmitter,
    PID controller, and motorized control valve.
  • Vertical or horizontal vessels provide maximum flexibility using minimum footprint
  • Complete range of sizes Only stainless steel components come in contact with undeaerated water. Spray nozzle, scrubbing section and internal vent condenser are all stainless steel
  • A.S.M.E. Code and National Board stamped receivers – 50 psi standard vessel options include stress relieving, non-destructive testing and full vacuum
  • Custom engineered packaged system includes boiler feed water pumps and quality components to insure reliable service

Standard Features Include:

ASME code vessel

  • 4’ Stand
  • Factory piped and mounted electric modulating make up/level control
  • Factory piped and mounted 3-valve by-pass and strainer
  • Steam pressure control valve & strainer
  • Safety valves
  • High efficiency boiler feed pumps
  • Factory mounted pump suction piping with flexible connector & shut off valve
  • High & low level switches


The P5 deaerator provides excellent performance utilizing the high velocity incoming steam to atomize makeup water and pumped returns. Stainless steel internal components provide reliable performance for many years. This superior spray-type design directs the cleanest incoming steam to scrub out the last traces of oxygen from the partially deaeratored water. Guaranteed performance .005 cc/liter per ABMA testing procedures.

P5 .005 cc/liter Horizontal Pressurized Deaerator

NEMA 1 control panel with:
Control circuit transformer

  • Fused disconnect
  • Integral starters
  • Pump run lights
  • HOA switches for each pump
  • Alarm and silence

P5 .005 cc/liter Vertical Pressurized Deaerator

NEMA 1 control panel with:

  • Control circuit transformer
  • Fused disconnect
  • Integral starters
  • Pump run lights
  • HOA switches for each pump
  • Alarm and silence

Condensate Return Units

High Quality Stainless Steel Exceptional Value, Extraordinary Quality

Aero Stainless Steel Condensate Return Units from Industrial Steam offer the best materials available for long life. Tanks have a 20 year warranty against corrosion and are made from 12 gauge 304 SS with internal ribbing where needed for excellent strength. Available in five standard sizes; 12, 25, 45, 70 and 100 gallon capacities (custom sizes and configurations as required); tanks only, and in simplex or duplex pump configuration (triplex and quadplex available on request). Compact dimensions and light weight make it a simple task to replace your old cast iron unit. System accessories are of the highest quality. These tanks are made to fit many other brands of vertical flange mount pumps. Be sure to see our pumps for a complete system.

Pumps are made of investment cast stainless steel. The single stage impeller is of semi-open design allowing for occasional pumping of small solids without clogging. Pump is externally adjustable to like new performance should wear ever occur.

Pumps are permanently aligned to the electric motor, never requiring alignment at the job sight. Pumps are furnished with 250*F mechanical seals, and are equipped with a seal cavity bleed line to keep the seal lubricated and minimize the probability of premature seal failure. Pump discharge openings are NPT.

Electric Motors are drip proof ball bearing as standard. Standard motors are: three phase- 208/230/460 V TEFC, Single phase -11 5/208/230 V ODP. Various other voltages are available on request. Other motors available are explosion proof, wash down duty, premium efficiency, and any other motor available with a 56C frame.

Motor/pump controls available for simplex, duplex, triplex, and quadplex, in single phase, or three phase with a limitless list of available options for any requirement. Nema 1 is standard enclosure. All other enclosures available.

Simplex & Duplex Tank/Pump Selection Guide

Standard unit includes: SS tank complete with flange mounted SS pump close coupled to motor of HP shown 115/208-230V/1/60 or 208-230/460v/3/60 3450 RPM ODP. Simplex unit has NEMA 1 float switch and duplex has NEMA 1 alternating float switch. Sight Glass is standard. Available motor options: TEFC, washdown duty, & explosion proof motors. Additional Accessories: Thermometer, Nema 4 electrics, Isolation valves.

A3 Deaerator Feedwater Heater

Direct replacements for all Schaub Engineering designs


  • 99% OXYGEN REMOVAL prevents boiler system corrosion and costly retubing
  • UNRESTRICTED VENTING assures quick release of liberated gasses and NO BACK PRESSURE for gravity returns
  • ATMOSPHERIC DESIGN requires no safety valves or annual inspection
  • ELECTRONIC INSTRUMENTATION for modulating level control includes a HART compatible differential pressure transmitter, PID controller, and motorized control valve
  • ULTRA SENSITIVE steam regulator provides uniform reliable heating at all loads
  • NO PRESSURE DECAY reduces the chance for pump cavitation
  • STAINLESS STEEL construction of all internal heating surfaces
  • DURATHERM LINING is field renewable and increases the overall system lifespan
  • CUSTOM ENGINEERED PACKAGED SYSTEM with low net positive suction head (NPSH) pumps and high quality components insures reliable service and single source responsibility
  • HIGH TEMPERATURE returns are used for heating
  • LOW PRESSURE returns can flow by gravity back to the deaerator  or can be pumped through the makeup nozzle

Additional Options

  • Pump discharge piping
  • Pump staging
  • Combination motor starters



We are sure to satisfy all of your boiler feedwater needs

We provide the following guidelines to help you (our customers) decide which type of system is best for your application. To help you select the best boiler feed system for the job, a boiler feed system is sized with five parameters in mind:
1. How much feedwater?
2. Boiler operating pressure?
3. Tank storage capacity? New or replacement tank?
4. Is feedwater heat required?
5. Is corrosion protection required?


Full Range of Sizes

Atlantic Feedwater Systemsoffers a full range of sizes, with units ranging from 50 to 1,000 gallons. Oversized vessels are available.

Horizontal Boiler Feed Systems:

• Size designed for firetube and commercial watertube boiler applications.
• Standard horizontal unit sizes.
• Packaged unit, shipped complete with the pumps and pump suction piping factory
installed. Most components are factory installed.

Compact Vertical Units:

• Size designed for Apartments and Office Buildings, and replacements.

• Maximum size diameter of 34″ fits through 36″ doorways.

• Simple/Low cost design.

• 50, 100, 150 and 190 gallon unit sizes.

• Many in stock for next day shipments

Oversized Vessels Available:

• Standard options are available to increase the tank to the next larger size.

• Handles condensate surges.

• Provides extra capacity.

The appropriate size of the tank is dependent upon several factors, including the amount of feedwaterpump operating pressure, and amount of condensate.


How Much Feedwater?

The pumps for the Atlantic Feedwater Systems are
pre-selected to make it easy for you to select a system. 

For example, a model 100 FS is sized to supply one 100 HP boiler if it is chosen with one or two feed pumps. If the three pump unit is chosen, it includes two pumps sized for 50 HP each, with one 50 HP pump for standby. All catalog pump selections are based on “On-Off” pump control. Consult the factory if modulating feedwater control is used.

If you would like to size the pump yourself, here is how:

1. Convert the Boiler Horsepower

Convert the boiler horsepower to the amount of water the boiler needs to make the full capacity steam rating. For most firetube and commercial water tube boilers convert the horsepower to pounds (#) of steam per hour. Then divide the # per hour of steam by 500 to get the evaporation rate.

2. Calculate the Pump Flow Rate

The flow rate is determined by the amount of water the boiler needs to make steam at full capacity.

On-Off Pump Control: If the boiler level is controlled by turning the feed pump on and off, the pump is usually sized to pump twice the rate the boiler requires at full load. This provides enough capacity for the pump to catch up with the boiler when it is turned on.

Modulating Feedwater Control: If a modulating valve controls the boiler water level, the feed pump is sized to provide 25% more water than the full load evaporation rate. A second adjustment is required to provide for recirculation flow required to protect the pump.


Pump Operating Pressure

Atlantic Feedwater Systems specializes in economical boiler feedwater systems that use Simplex, Duplex, and Triplex centrifugal pumps

Simplex systems use one pump, Duplex use two pumps for one boiler feedwater system, and Triplex systems have two boilers with three pumps (one pump is standby). Centrifugal pumps make customary boiler feed pump oversizing unnecessary due to their extremely low wear characteristics.

Standard Centrifugal Pumps:

• Higher efficiency than turbine type pumps.
• Less maintenance.
• Less wear and tear on the centrifugal pumps than on turbine type pumps.
• Single stage for low-pressure steam systems.
• Multistage for high-pressure steam systems.

The Boiler Feed Pumps are available in standard sizes for easy selection. The feed pumps are cataloged for specific discharge pressures. The discharge pressure listed in the literature is the operating pressure of the boiler. The pump chosen includes additional head to overcome the pipe losses between the feed pump and the boiler. All sizing assumes “On-Off” feedwater control.

If you would like to size the pump, or the discharge pressure is different than the catalog sizing, calculate the discharge pressure this way:

1. Add for pressure drop in the piping

If On-Off pump control is used, add for the pipe loss between the boiler and pump, as well as for the drop across the feedwater stop and check valves. Common practice allows about 20 psig for these pressure drops.

If Modulating Feedwater Control is used, an additional pressure drop is required by the feedwater valve. Most feedwater valves are sized in the range to produce between 10 psig and 30 psig pressure drop at full flow. Most people use 25 or 30 psig pressure across the valve for sizing purposes. This is in addtion to the piping valve losses.

2. Convert the discharge pressure to Total Dynamic Head in feet (TDH)

Pump discharge pressure is rated in feet of head. To convert from psig to feet of head, multiply the calculated pressure by 2.31 to get Total Dynamic Head in feet (TDH).

If the water is near the boilng point, you may wish to correct for the specific gravity of the water. At 212º F water divide the TDH by 0.96 to get the head to use to find the pump discharge pressure.

Tank Capacity

Tank Storage Capacity

Atlantic Feedwater Systems specializes in economical boiler feedwater systems. The tank storage capacity is an important parameter to consider when selecting your feedwater system.

How Big is the Tank?

If the system has a large amount of condensate returning, you may wish to use a tank which provides more than the typical 1 gallon per boiler horsepower of capacity. The larger tank capacity allows the vessel to receive large condensate surges with less chance of the condensate overflowing to drain. It is best to eliminate condensate over-flow. Losing condensate to the drain wastes valuable water and energy. If the feed system has a large enough tank, this will not happen.

If the condensate returns exceed 50% of the total unit flow, you may wish to increase the tank size to the next larger size. This will increase the capacity to 1.5 gallons or 2 gallons per boiler horsepower. We have seen some people use storage capacities of as much as 3 gallons per boiler horsepower on large campus type systems. The larger tank is a small investment to make in order eliminate condensate loss during surges. For example, the cost to increase a 100 gallon horizontal tank to 220 gallons is only $330.

Do You Need a Replacement Tank?

Over time, boiler feed systems fail during operation. The primary cause of failure is vessel corrosion due to high levels of make up in a vessel using a steam sparge tube to heat the feedwater in the vessel. If oxygen corrosion caused the vessel to fail in 3 or 4 years, you should consider replacing the vessel with a corrosion resistant vessel. The initial higher cost of a stainless steel replacement vessel will be offset by its extended life. We can provide replacement vessels for any system in the field.

When choosing a replacement vessel
try to answer these two questions:

 • Why did the vessel fail?

 • How old was the vessel?

If needed, we offer quick delivery service. Call for details.

Steam Pre-Heat

Feedwater Systems Steam Pre-Heat

Atlantic Feedwater Systemsspecializes in
economical boiler feedwater systems.

If a system has 80% of the condensate returning at 200º F with 20% make up at 60º F, the blended feedwater temperature would normally be about 170º F. This should be adequate temperature for most firetube or commercial watertube boilers.

If, for example, the system has 50% make-up at 60º F and 50% returns at 200º F, the blended feedwater temperature would be about 130º F at normal operating conditions. This system would normally require feedwater heat to protect the boiler.

A sparge tube with a temperature switch and steam supply valve is available. This is an inexpensive way to heat the feedwater to acceptable levels.

The heater assembly has a solenoid or self-contained type control valve with a 250 lb. screwed body up through 2″ (the 2-1/2″ has a 125 lb. flanged body), heater tube, y-strainer, and required piping. The selection is determined by percentage make-up, type of heater valve (solenoid or modulating), and pressure level of steam (low pressure of 15 lb. versus high pressure of 100 lb.). Heater assembly options are listed as part of the select and customization process.

Corrosion Protection

Corrosion Protection

Atlantic Feedwater Systemsspecializes in economical boiler feedwater systems. Optional corrosion resistant construction is available to extend the life of the unit.

Boiler make-up water and condensate can be very corrosive. Make-Up has oxygen. Higher level of make-up in a system introduce more oxygen. Higher levels of make-up require more steam for feedwater heat. If the water is heated in the tank by injecting steam through a sparge tube, there can be oxygen corrosion in the vessel. More steam and more oxygen result in faster corrosion in the vessel. If the condensate is acidic, which is normal, the condensate can increase the rate of corrosion further.

It is common for system with 70% or 80% make-up to wear out in 4 or 5 years due to oxygen corrosion. How can you guard against premature failure of the vessel? Use a corrosion resistant material or coating to protect against oxygen corrosion. Using a coating or stainless steel will extend the vessels life. The higher the level of make-up, the greater the need for a corrosion resistant lining. The severity of the expected corrosion may suggest on option over the other.

Corrosion Resistant Options:

• Hot Dipped Galvanized Vessel Construction
• Baked Epoxy lining (330 to 1,000 gallon vessels)
• 304 Stainless Steel

Boiler Feed System Standard Equipment

Boiler Feed System Standard Equipment

Atlantic Feedwater Systems
Specializes in economical boiler feedwater systems.

The Standard Equipment for each packaged Horizontal Boiler Feed System includes:

1. Receiver factory mounted on stand

2. Bronze Float type make-up valve

3. Stainless Steel temperature gage

4. Bronze water gauge cocks with 5/8″ red line gauge glass

5. Centrifugal Boiler feed pumps

6. Suction piping including shut off valve

7. Magnetic starters for each pump with enclosure

8. Hand-Off-Auto switch in each starter enclosure

You may obtain a copy of the standard Horizontal Boiler Feedwater Systems specifications in pdf format by clicking here.

Pump Data for Single Pump & Two Pump Boiler Feed Systems

Pump Data for Three Pump Boiler Feed Systems

Atlantic Feedwater Systems takes a total system approach to your application requirements.

We provide the following:

Conceptual System Design
Because Atlantic Feedwater Systems is involved in all types of systems. we can bring the “best in class” from many different applications. We can consult with you from the ground up on matching your needs with the proper system to handle your feedwater needs that will provide a reliable cost effective solution.

Detailed System Design and Sizing
Atlantic Feedwater Systems can work with you to size the pumps to match your requirements, to size the piping to give you a cost effective installation and will perform to make sure the system provides reliable service. As controls systems become more involved with these systems we will also help layout a system that will provide safe and reliable service and provide the informational needs of the facility.

Overall Project Management
Once a project is started we can help with management of that project throughout its lifetime.Atlantic Feedwater Systems can help maintain the time schedule with is typically so important on these project. Steps that are critical are the submittal process, parts purchasing, assembly and testing, timely shipment, installation help for the contractors, startup, and training.

Once installed factory trained representatives will help with startup of the equipment. Typically they are also available for installation help where they will meet with the installers to makes sure the equipment is installed properly the first time eliminating costly and “time delay” rework at the job site.

All system are fully documented with equipment drawings and electrical schematics. Sequence of Operation documents are also included for all the control equipment.

After the system is installed, started up and commissioned our factory trained representatives are available for training.

Life Cycle Support
For the life of the product we are available for support. Typically these systems once installed and commissioned will require very little support, but if it comes up we are available to help with parts, field service, and design upgrade services.


Download The Boiler Feedwater System Brochure Here Download The P5 .005 cc/liter Pressurized Deaerators Brochure Here Download The A3 Deaerator Feedwater Heater Brochure Here


Email inquiries to:

or call: Phone: 712-243-5871



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