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For reliability, longevity and unmatched service, choose Preferred!

This Preferred JC-CDDF2 chief dispatcher model has been in service since the 1970’s in a Newport, RI facility. When one of the relay sockets finally broke, they called Preferred.

Although this unit has been out of production for nearly 20 years, we still had replacement parts in stock and original wiring diagrams for the installation of the new parts.

Built in the USA and built to last!

 

-Today’s Boilers


This is a Letter to the Editor written by David Eoff of Preferred Utilities to Today’s Boiler regarding an article in the Spring 2018 edition called: Warning–A Boiler Breakdown may be in your Future story.

As Geoff Halley, the author of this article stated, the low water cutout switches that prevent a boiler from dry firing are prone to failure, and require periodic maintenance and testing. Low water cutout float switches can become stuck due to accumulation of sediment on the float mechanism, or due to the float getting deformed and sticking against the side of the switch housing. Probe type low water cutouts can fail due to accumulation of sediment on the probes, broken wires, and malfunctioning relays. Both types of low water cutout devices can be wired wrong, or intentionally jumpered by boiler operators.

As a back-up to traditional, code required low water cutoff switches, Preferred Utilities recommends a high stack temperature cutoff be installed in all boilers. A high stack temperature cutoff set at 200-300 degrees F. over normal stack temperature will quickly shut the boiler down if it is dry fired, and is not likely to cause nuisance trips. The high stack temperature cutout usually consists of a thermocouple installed in the stack that reports back to the boiler flame safeguard controller. Preferred Utilities’ BurnerMate Universal and BurnerMate TS controllers have included this feature for decades. Preferred’s JC-15D stack temperature monitor will open a dry contact if the stack temperature goes above a pre-determined setpoint and can be added to virtually any flame safeguard system.

Several Preferred Utilities representatives and technicians have reported these high stack temperature cutoff devices have saved boilers from dry firing when the traditional low water cutoff switches failed. People who have experienced a close call like this insist on installing a high stack temperature cutoff on every future boiler.

A stack temperature thermocouple is inexpensive, reliable, reads constantly so you know the device is working, and requires no maintenance. It’s cheap, reliable insurance against a catastrophic dry firing event.”

–David Eoff

 

The EPA made changes to the 1988 Underground Storage Tank (UST) regulations back in 2015, but the changes have not gone into effect until a date soon approaching, October 13, 2018. According to the EPA, the changes to the UST regulations are because of new technology proven to be reliable and accurate and the wide variety of new fuels on the market.

There are four main reasons for the EPA’s changes to the UST regulations: 

·       Operating and maintaining UST equipment properly

·       Prevent and detect UST spills and Releases

·       Protect against groundwater pollution

·       Even standard for all UST


Below are some of the following new changes to the EPA regulations that must be completed by October 13, 2018.

1.       Secondary Containment, Interstitial Leak Detection, Dispenser Containment1

When installing or replacing UST and piping owners must install secondary containment. Along with secondary containment, the owner must place interstitial monitoring as spill monitoring in these new tanks and pipes. Every new UST must have an Under-Dispenser Containment (UDC) installed.

2.       New Minimum Training Requirements2

Each operator working with a UST must be trained on the equipment by the manufacturer. Class A and B operators must receive training before October 13, 2018, or within 30 days of returning to work responsibilities. Class C workers must be trained before October 13, 2018.

3.       Walk Through Checks and Tests of Equipment3

Every 30 days the following equipment must be checked and tested: spill prevention equipment, release detection equipment, containment sump testing, and release detection system.

4.       Updated Criteria for Storing New Fuels4

New regulations for UST storing new emerging fuels.

5.       Past Deferrals for equipment were Removed5 6

The old deferral system for emergency generator tanks, field constructed tanks (FCT), airport hydrant systems (AHS) and wastewater treatment tank systems has changed due to new technology giving operators the ability to correctly and securely monitor these tanks.

6.       Updated Codes of Practice7 

New and updated codes of practice.

7.       State Program Approval (SPA)8

The EPA now requires that your state follow the new updated changes made to the UST regulations, even if you are in Indian country.

For a comprehensive list of changes made by the EPA go to: https://www.epa.gov/ust/revising-underground-storage-tank-regulations-revisions-existing-requirements-and-new#compliance

For a more detailed breakdown of each change go to: https://www.epa.gov/sites/production/files/2015-07/documents/regs2015-crosswalk.pdf

These kind of changes blindside many facilities. Preferred Utilities can help. We provide expertise along with a wide variety of valves, leak detection probes, and tank monitoring systems that help facilities keep up to date with the new regulation compliance. Preferred Utilities’ full staff of knowledgeable engineers work to keep the best products available, so your facility stays safe, secure and compliant. 

For the full line of services and products Preferred Utilities Manufacturing Corporation offers please click on the link below or call 203-743-6741.

Preferred Utilities Manufacturing Corporation

 

 

References and Links

1. https://www.epa.gov/ust/secondary-containment-and-under-dispenser-containment-2015-requirements

2. https://www.epa.gov/ust/operator-training-minimum-training-requirements-and-training-options

3. https://www.epa.gov/ust/operating-and-maintaining-ust-systems-2015-requirements

4. https://www.epa.gov/ust/emerging-fuels-and-underground-storage-tanks-usts

5. https://www.epa.gov/ust/emergency-power-generator-ust-systems-2015-requirement-release-detection

6. https://www.epa.gov/ust/field-constructed-tanks-and-airport-hydrant-systems-2015-requirements

7. https://www.epa.gov/ust/underground-storage-tanks-usts-laws-and-regulations#code

8. https://www.epa.gov/ust/state-underground-storage-tank-ust-programs#which

 

 

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.

Learn more about Preferred Special Combustion Equipment (PSCE)

 

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 bsy@preferred-mfg.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.

See the article here: http://www.nebhe.org/thejournal/down-in-the-boiler-room/

 

 

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.

We offer a web tool to check suction conditions and size fuel oil pumps and piping systems here:

And finally, you can generate a complete Facility Fuel Oil specification section based on Preferred products.

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.

 

– Robert Frohock, PE