Cannon Boiler Works Products

 green arrow Ultramizer

green arrow Feed Water Heaters

green arrow Condensing Economizers

green arrow On Demand Economizers

green arrow 90% Efficiency

green arrow Heavy Duty Economizers

green arrow Vent Condenser

green arrow Steam Accumulator

green arrow Custom Heat Exchanger

green arrow FAQ

Frequently Asked Questions

Q: CAN YOUR ECONOMIZER BE MADE SHORTER?
A: In all cases, the answer is YES, but there are compromises to doing so. We will work with you to minimize any performance compromises and make your installation as easy as possible.

Our Feedwater Heater line of economizers has inlet and outlet transitions included in the base price. The lower transition has a baffle and drain system, that helps keep condensate from entering the boiler, at no extra cost. Making a unit shorter could compromise not only the baffle system but more importantly the backpressure put on the boiler/burner system, and this could negatively impact performance.

On our traditional welded economizers again the answer is YES, as these units are infinitely variable to fit the available space and performance characteristics of the boiler/burner system.
Other Products

Waste Heat Boilers

Finned Tubing

Pressure Vessels

Boilers

Intercoolers

Aftercoolers

Lube Oil Coolers

Air Coolers

Specialty Products		 Q: CAN YOU PROVIDE PIPING AND INSTALLATION ASSISTANCE?
A: YES, we have some standard piping diagrams available for email to our customers. These are only suggestions, as every installation is slightly different in the existing equipment and available space. Also, our knowledgeable representatives, located nationwide, are experienced in making
installation issues disappear.

In all cases, we wish to have water flowing through our economizer whenever the burner is on; therefore provisions have to be made for circulation through our heat exchanger and back to an existing tank when the boiler is not calling for water.

We can guide you through the three methods that this can be done;
1) Manual valve or set orifice plate
2) Spring loaded pressure regulator
3) Solenoid valve as slave from boiler feed valve.

Q: WHAT PRESSURE SHOULD THE SAFETY VALVE BE SET AT?
A: Our units are designed and Code stamped between 400 and 450psig. We supply the valve matching the unit design pressure as a default. At a customers request, we can set the valve lower (matching existing boiler) or higher (requires Code calculations at extra cost).

Q: WHAT ARE YOUR STANDARD MATERIALS OF CONSTRUCTION?
A: Tubes – our units come standard with SA178 Gr. A boiler tubes. Several grades of stainless steel are available as upgrades, depending on potential corrosion problems and operating temperatures, such as 304SS, 316SS, Duplex SS, AL6XN

Fins – our units come standard with low carbon steel fins, with nickel brazed fin attachment to the tube. Also available are 409SS, 304SS and 316SS depending on potential corrosion problems and operating temperatures

Frame – our standard frames are made of carbon steel angle iron, and are available in 304SS depending on potential corrosion problems and operating temperatures

Removable side panels – Our standard units include 16 ga. 304 stainless steel lining, two inches of insulation, and 16ga. carbon steel painted exterior.

Transitions - Our standard units include 10 ga. carbon steel painted exterior. Thicker carbon steel is available to support extra weight, and 304 stainless steel is available for potential corrosion problems.

Q: DO WE HAVE TO INSULATE YOUR UNIT IN THE FIELD?
A: The removable side panels are insulated. The piping and transitions should be insulated by the installer. We do not offer additional insulation for the transitions because it may not survive during shipment.

Q: WHAT ARE THE POTENTIAL PROBLEMS WITH AUSTENITIC STAINLESS STEEL TUBES, TYPE 304 AND 316?
A: Stress corrosion cracking of austenitic stainless steel eliminates it from use in ASME Section I pressure vessels. Chloride levels in the water, or halogen compounds in the flue gas, can cause leaks in these tubes in a very short amount of time. Many studies can be found on the internet on this subject, (search: stainless steel SCC). We offer duplex stainless steel tubes to combat this problem.

Q: WHAT IS DUPLEX STAINLESS STEEL USED IN YOUR TUBES?
A: ASME SA789 type 2205 duplex stainless steel is a homogeneous mixture of austenitic and ferritic stainless steel. It is acceptable for ASME Section VIII units and has better corrosion resistance than 300 series stainless steels in most boiler room applications. We have great success with this grade of tubes in our units, as they normally last the life of the boiler system. Many studies can be found on the internet on this subject, (search: duplex stainless corrosion)

Q: DOES YOUR UNIT COME WITH A BYPASS DAMPER?
A: Our standard offer does not include a bypass damper, as we want to recover heat 100% of the time the boiler is operating. An integral bypass is available in cases where it is needed. Or our On-Demand unit has a bypass damper system included.

Q: WHAT IS THE DIFFERENCE BETWEEN A REGULAR ECONOMIZER AND CONDENSING ECONOMIZER?
A: The difference is the temperature range in which the economizer is operated. Our units may look identical in outward appearance, but can be used in a condensing application if originally design to do so. A traditional economizer is operated in a hot environment, the tubes and the flue gases are over 200F. A condensing economizer operates in a cool environment, where the tubes and flue gasses may be well under 200F. A large savings increase occurs when the flue gas temperature is decreased to under 135F, but this is only effective when burning natural gas.
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Cannon Boiler Works, Inc.
510 Constitution Blvd., New Kensington, PA 15068
P: 724.335.8541 F: 724.335.6511
sales@cannonboilerworks.com