Our products include fuel oil handling systems and components, boiler instrumentation and controllers, high quality burners and nuclear power plant outage reduction tools and component parts. Continuous research and development is applied to our existing products and is helping us to lead the industry with new and innovative power plant solutions.
Take a trip through our headquarters/ manufacturing facility and catch a glimpse of our engineering and production team at work!
The end of summer is marked by the departure of our fine group of interns who join our team May through August. Before they go, interns and managers get together so each intern can present their major completed projects to peers and Preferred team members.
Thank you for your great work at Preferred and best wishes for a successful semester:
Jeff Hamilton, Nina Constable, Jake Powell, Nick Bishop, Scott Borgstedt, Christopher Bohn, Richard Bohn, Tim Vanderhave, and Michael Little.
Team members from our Danbury, New York, and Boston offices along with associates of Preferred Utilities got together on August 9th for the 7th Robert G. Bohn Memorial Invitational golf tournament. This tournament is hosted by David Bohn and Preferred annually to celebrate the life and successes of Mr. Bohn’s father, the late Robert G. Bohn.
A U.S. Naval Air Corps pilot, Robert G. Bohn graduated from Greenbriar Military Academy and Dartmouth College and joined the family business after WWII in 1947. President and CEO of Preferred from 1963 to 1995; he continued as CEO and Chairman of the Board until 2011.
Robert Bohn’s accomplishments at Preferred include acquiring three companies: the instruments division of General Controls, W.N. Best, and Rimcor. These companies provided Preferred’s instruments, controls, and combustion lines of equipment. He was also the creator of Preferred Engineering with a group of local engineers.
One of our favorite traditions here at Preferred is remembering Robert G. Bohn with a sport he loved, and honoring his memory as a gentleman, leader, colleague, and friend.
The Coen “AC” valve has been nearly irreplaceable because of it complicated, characterized design and expense – until now!
As just one of its capabilities, the Preferred Voluvalve directly replaced and exceeded the performance of the Coen “AC” valve at this recent project site.
The Voluvalve can be made to drop in as a direct replacement for a COEN “AC” valve or be used in a parallel positioning type control strategy as was utilized at this jobsite with our BurnerMate Universal Combustion Controller and Flame Safeguard System.
Using a custom and proprietary drilled hole pattern inside the valve, it allows the valve to repeatedly, and accurately match the optimal efficiency flow rate, and fuel air ratio characteristics for any burner.
Designed and Manufactured in Danbury, CT USA and started up in the field, if requested, by our application engineers. Contact us for more information.
Pictured: one of two Preferred Special Combustion burners and control cabinets to be installed at an American steel manufacturer in Ohio, and utilized on twin super heaters used in the steel manufacturing process.
The burners, atmospheric element style heaters, use stoichiometric combustion to produce heat input for the super heater. The Preferred UV Self-Checking Quanta-Flame Scanner monitors the flame.
The control cabinets are PCC-IV based, multi-loop controllers combined with the Preferred M-85 Flame Safeguard Controller and Preferred Quanta-Max, a state-of-the-art microcomputer-based burner management system (BMS).
These components work in tandem with the scanner and other safety products on the burner and fuel train to produce safe, stable, and efficient combustion process.
A high efficiency and very “green” 50 KPPH Packaged Burner System about to ship out to one of the world’s largest privately held companies.
Preferred Special Combustion Engineering (PSCE) provides a complete package combustion system for new or OEM watertube boiler projects. A complete packaged burner system (including controls) all from one source will optimizes burner to boiler special interface, allows for maximum pre-wiring of the system devices, provides a more complete checkout process, and minimizes field errors and commission time.
These often overlooked factors add up to real dollars saved.
For more information or to discuss your application, contact Brian Sy at (203) 297-4800 or by email at email@example.com
Advances in bio fuel and combustion control technology can help New England colleges and universities meet the 2020 emissions reduction goals of the President’s Climate Leadership Commitments, signed in 2007.
Preferred Utilities is advancing environmental combustion technology on several fronts with burner and control equipment that use renewable fuels, and ultra-High efficency technology which reduce greenhouse gas emissions significantly.
Preferred’s products and online tools can help Florida nursing homes and assisted-living facilities (ALF) meet state proposed fuel storage legislation.
After emergencies during and following Hurricane Irma, B 7028 and HB 7099 make permanent rules that require every nursing home and ALF in Florida to have emergency generators, keeping residents safe and their facilities functional at least until help can be sent to them after disasters. (Florida Governor’s statement)
The online tools provide a head start on emergency generator system design and planning. Our fuel load web tool calculates main tank storage size based on generator kW.
Preferred’s ATPSF duplex pump sets include integrated pump controls and optional tank gauge and leak detection systems. We also offer day tanks, return pumps, fill boxes, and all the accessories to make a complete fuel oil handling system.
Although our engineers can custom design a system for any number of generators, our standard pump control program can handle up to two-day tanks and up to two main storage tanks right out of the box. With no programming and minimal engineering required, these systems are available with very short lead times.
Contact us to speak with an experienced Preferred engineer.
Most of us benefit from some sort of combustion every day. Whether for the release of heat or the expansion of gas to perform work, this special category of oxidation is probably the most widely-used chemical reaction in our daily lives. Like most chemical reactions, there are parameters that need to be present not only for the reaction to take place, but to be the most efficient.
For combustion, we follow the Three T’s…time, temperature, and turbulence.
The time of combustion refers to the rate of the reaction. The fuel (natural gas for example), is introduced to the furnace through injectors or pokers. These are usually pipes with a plate at the end with several holes (some call this a poker “shoe”). The volumetric rate, the size and the quantity of holes will result in a design gas velocity at each hole in the poker shoe. Remember also, most burners modulate, so as the firing rate changes so will the gas velocity. This range of gas velocities need to coincide with the rate of the combustion. Gas velocities too high result in the flame “leaving the zone” of combustion which can cause unburned fuel or flame outs. Gas velocities too low can result in “puffs” or a “punky” flame similar to when you shut the gas off to your grill (okay for barbecues, but not for your boiler).
The temperature of combustion is more intuitive. We all know we need to “ignite” the flame to start the reaction, but what does that mean? Simply, we are introducing heat with a spark or pilot flame at the point where air and fuel are mixed to start the reaction. Once the reaction is started, it provides the heat to maintain the temperature to keep the reaction going. Those familiar with gas pilots know adjusting the pilot gas pressure is key to making the pilot flame reliable. Make sure there is a separate pilot gas regulator to accomplish this.
The turbulence of combustion is the “mixing” of the ingredients…fuel and air. Those who have seen the heads of burners know the multitudes of designs to create turbulence at the combustion zone. This creates good mixing and efficient combustion. Poor mixing can allow unburned fuel to create unwanted compounds in the flue gas like carbon monoxide. Burner designers also consider the size and shape of the furnace. A turbulence pattern that makes the flame too wide or too long can result in flame impingement.
Burner technicians use a stack gas analyzer and a sight glass at the back of the boiler to make their final adjustments for the most efficient combustion. They also do this when the furnace is at normal operating temperature as a “hot” furnace has different combustion characteristics than a “cold” furnace.
So next time you’re in the boiler room, take a peek at the flame and look for the Three T’s.
FlexFit and flame safeguard installed in existing panel using existing wiring
Preferred is bringing something BIG to the industry!
Tired of fuel and electric waste? Want a more reliable system that also meets strict emissions standards? You know you need to upgrade, but the installation time and expense of a modern linkageless control system often just isn’t plausible…Until now.
Preferred’s new flexible solution dramatically cuts the cost and time for a linkage to linkageless control system retrofit. Now, you don’t have to upgrade your whole boiler room in order to have modern linkageless control.
So, what do you get? A deal on a modern efficient system, significant fuel and electric savings and rebates, and an intuitive system that will keep you ahead of any emergencies.
It’s the flexible retrofit solution…It’s the FlexFit.