Page 1
Form No. 5900-1
Bryan “Flexible Water Tube”
Boiler Comparison Guide
Flexible Tube Steel Boilers
Firetube Steel Boilers
Cast Iron Boilers
(Rev. 7/08)
BRYAN® BOILERS
Originators of the “Flexible Water Tube” design
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Boiler Comparison Guide
Firetube
steel boilers
Bryan fl exible water
tube steel boilers
Installation
Minimal assembly required for new building installations x x x x
Will pass through standard doorway in existing buildings x x
Right hand or left hand construction x
35
Estimated years of service life to 25 35 ?
40
Full 5 sq ft heating surface per boiler HP or more x ? ? ?
Cast iron boilers
Competitive water
tube boilers
Space Requirements
Minimal fl oor space needed to set and service x ? x ?
Maintenance
No major disassembly required for cleaning x
No welding or rolling required to remove and replace tubes x x
No repairs to damage caused by thermal shock x
25 year non-prorated warranty x
Effi ciency
Highest operating effi ciency based on combustion effi ciency x ? ? ?
and burner motor horsepower
Close match to specifi c load based on numerous sizes available x ? ? ?
Size range from 6 HP through 500 HP x x ? ?
Fuels
Oil, gas or gas/oil x x x x
Atmospheric gas x x
Each of above available with electric if desired x
Specialty applications
Large buildings x x x x
High-rise buildings regardless of boiler location x x x
Process steam, high pressure x x x
Process steam, low pressure x x x x
Low temperature return water application not requiring external pump x
*
Replacement of sections requires extensive labor and downtime.
*
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Boiler Comparison Guide
Selecting the Proper Boiler
If you’re an engineer, an architect, a mechanical
contractor or a building owner, selecting or specifying
the right boiler is probably one of your many concerns.
Steel? Cast iron? Watertube? Firetube? With all the
confl icting opinions, reports and literature in circulation,
it’s no easy task.
Economy
Installation costs. Because cast iron boilers come as
sectional units, substantial time-consuming assembly is
required. Steel boilers are shipped completely fi nished
and may require that walls be opened in existing buildings
or new buildings which have already been enclosed.
Bryan fl exible water tube steel boilers, however, are
prepackaged units that may be easily disassembled
(“Knockdown™”) to precisely the degree necessary.
Service life. The best estimates we have on boiler
life expectancy are thirty-fi ve years for cast iron units
and twenty-fi ve years for fi retube steel models. With
many boilers still on the job after forty to fi fty years of
service, Bryan’s fl exible water tube steel design has
demonstrated longevity equal to or better than that of
either alternative.
At Bryan, we understand the problem. That’s why we’ve
put together this guide. It’s a summary of how our fl exible
water tube boilers compare to fi retube, cast iron and
other water tube boilers in several important areas. We
think you’ll fi nd it helpful.
40 years
Bryan
fl exible
water
tube
boilers
35 years
cast
iron
boilers
25 years
Firetube
steel
boilers
Boiler Longevity*
*Competitive fl exible tube boilers not shown
due to inadequate experience.
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Boiler Comparison Guide
36"
72"
How to put a new boiler through a 26 x 56 inch opening.
Convenience
New building installation and assembly. While
sectional cast iron boilers often cause storage problems
and the loss of parts by arriving at the job site in several
pieces at different times, Bryan fl exible water tube steel
boilers are shipped as complete, prepackaged units. That
means the boiler arrives at the job site assembled and
ready for installation. In addition, Bryan boilers may be
shipped with or without tubes installed and, unlike cast
iron units, do not require any complicated assembly.
Bryan Knockdown™ construction allows entry into existing
buildings. You simply choose the degree of knock down
needed.
Replacement installations in existing buildings.
The opening of a wall required to replace an ineffi cient
or worn-out boiler with an assembled steel boiler is a
troublesome, costly and time-consuming operation. Most
Bryan fl exible water tube steel boilers, however, feature
Knockdown™ design which allows the unit to be easily
disassembled in stages. If necessary, the boiler may be
knocked down so it can be carried through entryways
smaller than a standard door.
Space saving standard and
reverse construction
allows Bryan boilers to
share common service
space as in this renovated
boiler installation in a
middle school.
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Boiler Comparison Guide
Space Requirements – 3,000 MBH Boiler
BRYAN
Competitive water tube boilers can require twice as much
space for service for half as much capacity. Bryans' standard
and reverse combination make it the best investment.
Space requirements. Bryan fl exible water tube steel
boilers generally require less fl oor space than comparable
cast iron units. The bent tube, removable from only one
side, requires approximately 24 to 32 inches of service
area, the same as most cast iron boilers.
With a fi retube steel boiler, the fl oor space used by
the unit itself must be doubled in order to accommodate
tube replacement.
An additional space-saving benefi t of Bryan fl exible
water tube steel boilers is reverse construction. This
optional design allows two boilers to face each other,
thus sharing the same service area and saving space in
the mechanical room.
Cleaning. Generally speaking, easy access makes Bryan
fl exible water tube steel boilers more convenient to clean
than either cast iron or fi retube units.
Removing a Bryan boiler’s jacket access door and tube
panel exposes the entire bank of fl exible water tubes.
An ordinary fl ue brush and vacuum cleaner are all that
is needed for complete cleaning.
Maintenance. With cast iron or fi retube boilers, replacing
the unit or tubes often means complete disassembly,
welding, rolling and an outside contractor. The water
tubes in a Bryan fl exible water tube steel boiler, on the
Cast IronOther Water Tubes
Cast iron boilers require a
section width area for service,
equals wider foot print.
Firetube boilers require
fl oor space equal to boiler
size for tube removal.
Firetube
other hand, can be replaced by a general maintenance
worker in about thirty minutes.
Replacement tubes are available from Bryan
representatives within twenty-four hours. And, most
temporary tube repairs may be made in minutes allowing
operations to continue until replacement tubes arrive.
Bryan design provides easy access
for the service and maintenance of
tubes and burner.
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Boiler Comparison Guide
Our Effi ciency is Guaranteed
Favorable or superior operating effi ciencies are frequently
reported for all types of boiler, particularly in advertising
and promotional materials. Most often, these claims are
based on factory laboratory tests.
Bryan fl exible water tube steel boilers achieve 86%
effi ciency in operation on actual job sites with normal
140° - 160°F return water temperature.
It should be noted that differences in effi ciency will
always occur between water boilers and steam boilers
or gas-fi red boilers and oil-fi red boilers.
Versatility
Multi-boiler installations and expansion. Because
Bryan fl exible water tube boilers are available in capacities
from 6 to 500 hp, they are well-suited for multi-unit
installations.
When more than one boiler is used — whether due to
expansion or in an original installation — Bryan can supply
a lead/lag demand analyzer system that
protects effi ciency by enabling the owner
to sequence only those boilers required to
meet the current load demand.
For instance, a Bryan oil-fi red hot water boiler can
be expected to operate in the 85% to 86% range, and
a forced draft gas hot water model in the 85% range.
Again, these are on-the-job effi ciencies rather than factory
laboratory results.
The Bryan fl exible water tube steel boiler is offered in
ratings from 6 to 500 hp. This wide selection also helps
promote higher effi ciency by allowing you to select a
boiler to match your requirements more closely.
In addition, the optional Bryan Energy Selector
provides oil and/or gas fi ring or alternate electric
power at the fl ip of a switch. This versatile feature is
not available in cast iron or fi retube boilers.
Fuel and fi ring options. Bryan fl exible
water tube boilers are offered with either
forced draft or atmospheric gas fi ring.
Either mode is available for use on multiple
fuels; natural/methane/propane gas and oil
or combination gas/oil.
Bryan lead/lag
demand analyzer.
Bryan’s Energy
Selector lets user
choose gas, oil or
electric fi ring with
the fl ip of a switch.
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Boiler Comparison Guide
Specialty Applications
High-rise buildings. Cast iron boilers are generally
limited to operating pressure around 80 pounds. Bryan
fl exible water tube boilers, however, can be provided for
working pressures up to or exceeding 150 psi, making
them ideal for high-rise buildings.
Steam process applications. Unlike low pressure cast
iron boilers, Bryan boilers are also available for nearly any
steam process application from 15 to 300 psi.
Steel boiler water heaters. All Bryan fl exible tube
steel water boilers can be ordered with single or
Bryan Benefi ts
Selection. In the full range of sizes to 500 hp, nobody
sells more water tube steel boilers than Bryan Steam.
American-made reliability. Bryan Steam’s Peru,
Indiana, manufacturing facility is one of the most
advanced boiler plants in the nation. All boiler parts are
made at this facility enabling Bryan to apply exacting
quality assurance standards in every stage of the
manufacturing process.
To assure fast service, Bryan keeps many packaged
boiler units in stock at the factory. All are available with
your choice of options, ready for immediate shipment.
multiple indirect
copper heat
exchangers for
a variety of water
temperatures.
This option gives
you the fl exibility
to include your service or process water needs in a single
unit, in most cases, regardless of the application. Such
an arrangement reduces costs and saves mechanical
room space.
A reputation for quality. Industry surveys repeatedly
show Bryan Steam fl exible steel water tube boilers
as the predominant choice of leading engineers and
architects.
After more than 90+ years of providing the HVAC
industry with the fi nest boilers available, Bryan Steam
has a quality assurance and fi eld service program
second to none. When you own Bryan boilers, more
than 120 experienced factory-trained sales and service
representative organizations located throughout
the world are always available for consultation and
assistance.
Companion Products & Accessories
Companion products and accessories. Bryan’s
complete line includes these dependable, performance
matched accessories. Design your complete system using
Bryan components for maximum reliability and value.
Condensate return and boiler feed pump systems.
These are available for use with any steam boiler, both
low and high pressure. Standard in simplex, duplex or
special arrangements for multiple boiler installations are
available. Tanks constructed of heavy-duty steel.
Bryan deaerators. Remove dissolved gasses from
incoming make-up water with minimal steam loss.
Deaerate to a maximum .005 cc/liter O2 and
0% CO
through 60,000lb/hr. Tray type deaerators
have stainless steel trays, are available in
standard capacities from 5,000 to 300,000
lb/hr.
Hot water storage tanks. Bryan offers
standard tanks in capacities up to 5,000
.
Spray type deaerators available
2
gallons, diameters to 84ⴖ, operating pressures from 30 to
250 psi. Protective linings, both phenolic and cement are
available. Insulated metal jacket optional.
Bryan exhaust heads. For oil-free
and water-free exhaust of steam. After
100 years, still the most reliable design
available. Flanged or threaded models
from 1ⴖ to 5ⴖ, as well as fl anged sizes
to 24ⴖ.
Blowdown separators and tanks. Used during
blowdown of system to separate steam from water, allows
dry steam to be vented to the atmosphere. Water may be
cooled if necessary to prevent thermal pollution.
Bryan overfl ow traps. Mechanical fl oat controlled
traps with cast iron bodies, double sealed brass valves,
stainless steel ball fl oats. Sizes from 2ⴖ to 6ⴖ for use on
pressurized deaerators.
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Bryan Steam
Since 1916— pioneer and leader in fl exible water tube boilers
In 1916 a locomotive engineer and steam power enthusiast named
George Bryan founded the Bryan Harvester Company, a small
manufacturing fi rm which produced steam powered tractors. The
rising popularity of the gasoline engine forced Bryan to abandon the
steam tractor in 1922, but it was not forgotten. The bent water tube
boiler which powered the tractor was extremely rugged, impervious
to thermal shock, compact, and easy to service, making it ideal
for other applications. Bryan Harvester became the Bryan Steam
Corporation and began refi ning and marketing that original boiler for
an array of uses. Today, Bryan Steam LLC continues to incorporate
many of the features found in the original Bryan Boilers. Applying the
advantages of past experience to projects for the future has made
Bryan the leader in the production of fl exible water tube boilers for
more than three quarters of a century.
Bryan Steam LLC — Leaders Since 1916
783 N. Chili Ave., Peru, Indiana 46970 U.S.A.
Phone: 765-473-6651 • Internet:www.bryanboilers.com
Fax: 765-473-3074 • E-mail: inquiry@bryansteam.com
Form No. 5900-1 © 2008 Bryan Steam LLC Printed in USA
78-8753
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