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Author Archives: Ruth O'Donnell

 

Pressure atomization depends on the oil pressure inside the nozzle tip to spray a fine mist of oil, very similar to a Windex spray bottle. The micronized oil droplets are flung into the burner head, where they are thoroughly mixed with the combustion air and ignited. As mentioned above, the pressure at the oil nozzle is the key factor in the atomization process; therefore, your oil pump and pressure regulator are the key components in this system. The pump needs to be able to meet the gallons per hour (gph) requirement for the burner/boiler to meet their load capacity. The pressure regulator is set in accordance to the firing rate which is normally between 100-300 (psi). The turndown ratio for a pressure atomizing burner is normally only 3:1 or 4:1.

However, Preferred has just designed and shipped our first high turndown, 6:1 guaranteed, pressure atomized API-AF burners.

These API-AF burners are UL listed for No. 2 oil firing, utilizing pressure atomization. We demonstrated a turndown of 8:1 on pressure atomized oil firing to the UL inspector, extending the normal turndown ratio which is usually only 3:1 or 4:1

 

NEW PRODUCT ALERT!

Background: In the past, using anti siphon valves between the day tank and a generator has been discouraged due to the low vacuum capability of generator pumps. A generator fuel oil pump may only be able to pull 5 in. Hg. In addition, there is a filter installed between the day tank and the generator pump that takes a 2-3” Hg pressure drop. This means that only 2” Hg could be available to open an anti-siphon valve, which poses a problem for most designs. Engineers have addressed the need to prevent siphoning from a day tank by installing a solenoid valve that opens when the generator pump turns on. However, this solenoid needs to be wired and is dependent on the controls functioning properly.

Solution: Now, Preferred has a better solution! We now have an anti-siphon valve that will open with only 2” Hg of suction available, and it is designed for application between the day tank and the generator pump. In addition, this Low Vacuum Anti Siphon Valve is UL Listed. For diesel handling components, it is important to ensure the valves one is purchasing are listed by a an agency such as UL as it ensures compliance to a standard and that the product has been independently evaluated. This Low Vacuum Anti Siphon Valve is available in ½” up to 2” NPT.

 

Experts from Preferred Utilities help them identify their problem, and then get it solved.

The Block Island School in Rhode Island has been considering some major upgrades in 2019, and although they’ve hit a couple of snags along the way, Preferred Utilities Manufacturing was able to help them solve a heating oil problem that threatened to stymie their whole project.

Back in March, school staff discovered a troubling heating oil spill that needed addressing. The heating fuel spilled out of a vent pipe to the school’s roof and then onto the ground below, near the playground behind the school’s south wing.

In a recent article in the Block Island Times, Sam Bird (the town’s facilities manager) said that it was not an easy diagnosis. The culprit, he and the representatives from Preferred realized, was a check valve in the fuel supply piping that did not open to send the oil back to the main tank after an electronic control unit failed. 

“The valve had not opened, or had not had a reason to open, for years,” Bird said. With the valve stuck shut, the pump still going, and the return line closed off, the oil had nowhere else to go except out the roof vent. After a few minutes, the valve opened and the fuel flowed back to its tank, and no more oil spilled from the vent. To fix it, Preferred recommended that the school replace the electronic controls on the pumps and valves that supply fuel oil to the heating system. The new system will bypass the day tanks with new piping to create a closed system, preventing the same kind of spill from recurring

After the installation, Preferred will return to start the new fuel supply system and train town or school personnel to operate it.

In addition to addressing this fuel oil problem, the school’s operations staff also had the site tested for asbestos, and the results were negative. So they are good to go with their eagerly awaited renovation project!

Preferred is happy to have the opportunity to work with schools like the Block Island School to help them solve pressing issues in their physical plants. With winter weather looming, is your school or college looking at spending too much on heating?

Call us, and we’ll look for ways to increase your efficiency and save you money!

 

October is National Cyber Security Awareness Month. According to a study by the University of Maryland, there is a hacking attempt every 39 seconds. And, the average cost of a data breach in 2020 will exceed $150 million.

We live in a connected world. These connections allow for a pace of commerce and communication previously unimaginable.

As everything becomes more connected, threats to the cyber security of commercial facilities and industrial equipment grow every day.

Traditionally, when working with operationally sensitive equipment such as HMI/SCADA Systems, the established practice has been to “Air-Gap” your equipment and prevent any access from the outside world. Globalization, regulations, & advanced data analysis techniques have made this practice obsolete and costly to your bottom line. Plants that choose to be “Air-Gapped” lose out on new innovations that allow for increased oversight and efficiency optimization to plant systems.

Now, you can connect to your facility and equipment from anywhere without compromising the security of your operations.

The Preferred Cloud Remote Monitoring Platform offers three levels of encrypted, secure, and continuous analytics on your equipment, while recommending cost saving and preventative maintenance options to reduce downtime and emergency service.

 

Wondering how to reduce GHG emissions by 30% by 2025 or 80% by 2050?

If you’re thinking you need to completely retrofit your entire boiler room, you’re wrong. There’s more than one way to meet your goals AND stay within your budget.

Preferred’s FlexFit Controller Retrofit Package, is the easiest, least expensive, most efficient way to go linkageless. This controller adds O2 trim, draft control, VFD and valve-proving capabilities as a standard and helps you meet your emission reduction goals too!

See the NYSERDA funded study by Steven Winters Associates that recommends linkageless retrofits!

Bring some Combustion Joy home for your operators, custodians, and superintendents this Fall.

 

Join us for a presentation on engineering & designing fuel oil systems!

Thursday, September 26th, 3 PM EST.

Experts John Haber and Ed Twiss, PE, have over 30 years experience designing fuel oil systems in the greater New York City area, as well as complete knowledge of all NYC codes.

Register HERE!

 

by Joe Wallace

Oxygen trim (O2 Trim) is a system that constantly monitors your boiler’s combustion. Unlike your car, your boiler has the ability to run properly without it, so what are the upsides to it? This system can adjust your air fuel ratio based on what it’s supposed to be and triggers alarms or lockouts should the combustion deviate from proper levels. It also helps end users save on operational and maintenance costs.

Safety:

We have all seen slipping couplings, broken shafts, blocked intakes or other things that have created improper combustion and unsafe conditions. Oxygen trim can prevent those situations from turning into something far worse. When a burner is tuned with O2 Trim, an oxygen level is assigned to each curve point and is stored with that point as a safe oxygen level. While the oxygen sensor continually monitors your burner’s combustion, it can detect any “off-curve” oxygen readings during combustion and adjust for them within reason. Should the oxygen level have a large deviation from setpoint, the control system will alarm and/or shut down the burner before something bad happens. Another safety function of O2 trim is if a very high CO condition is present, the CO will also make the O2 cell read a lower oxygen level and alarm/lockout the boiler.

Maintenance Savings:

Preventative maintenance should always be done in your boiler room including boiler tuning, but O2 trim may help save you some money on these visits. Since O2 trim constantly monitors your burner’s emissions and makes small adjustments to ensure proper and safe combustion, some areas have only required tuning bi-annually or less. Your system still needs to be set up by a professional and is certainly not a replacement for your service company, but is a great way to ensure your boiler is running properly between their visits. Due to this continually monitoring, the burner is much less likely to be damaged during operation. Improper combustion can lead to very expensive repairs to your system such as burner component replacement due to being burned up, refractory repairs do to instability and impingement, or a catastrophic boiler explosion. Having oxygen trim drastically decreases the risk of these events for a small fraction of the cost.

Operational Savings:

While one can tune a boiler for the conditions that exist while they are on site, what happens when the conditions change? The temperature in your boiler room, the fuel quality, hysteresis of control valves or dampers, etc. can cause a variation in your combustion. Often a boiler is tuned with a safety factor to accommodate for these variations which leaves some efficiency on the table. With O2 trim, you don’t have to accommodate for these future variations, therefore allowing you to run your boiler more efficiently. Your return on investment is contingent on your fuel usage and there are several utilities incentivizing the installation of this equipment with rebates as it has been proven to reduce fuel usage.

Oxygen trim is best coupled with a linkageless control strategy. If you have a Preferred Utilities FlexFit or BurnerMate Universal system already installed, oxygen trim is easily added. The return on investment is dependent on your usage and incentive programs in your area and can often pay for itself within a single heating season.

Ask us how you can improve your boiler efficiency and start saving today.

 

To meet New York City emissions regulations and secure a sustainable future for their plant, the 4th largest high pressure steam plant in NYC chose Preferred for its #6 oil to gas and #2 oil conversion.

This plant has a rich history, with four (4) watertube boilers stamped 1939, traditionally burning #6 oil except during World War II when they burned coal because oil was going to the war effort.

Pictured Below: Old panel on the left, new panel on the right- This is one of five new panels. We accommodated the customer with the same look of the old panel, but with state-of-the-art technology.

With (4) watertube boilers and (4) 60,000 gallon, single wall tanks buried 15 feet underground, they had some work to do in order to convert from #6 oil to gas and #2 oil by 1/1/2020, when NYC enacts fines for facilities not in compliance with emissions regulations.

Preferred met the challenge with new oil guns/tips, a complete and new fuel oil system, Allen Bradley PLC combustion controls to replace their old Bailey single-loop controllers, and EPA, DEC, DEP compliant tank gauging system for the single wall, buried tanks.

Spreading Combustion Joy through compliance and innovation!

 

Preferred’s R&D department made such significant improvements to the JC-30D opacity monitor, we re-branded it the JC-30D-EZ. The new opacity monitor is EZ to install, EZ to setup, and EZ to calibrate.

What’s New?

  • With the new LED light source, there is nothing to adjust on the light source side of the opacity monitor. So the adjustable mount has been replaced with a rigid pipe mount.
  • Because the new detector lens is directional, the new receptor can’t see ambient light coming in from severe angles, so the light shields are not required anymore.
  • The electronics in the light source have been improved to allow calibration from the display. The DIP switches, pushbutton, and potentiometer are gone, so calibration can be initiated from the display on the ground and there is no need to go up on the stack anymore.

The JC-30D-EZ can be set up to auto-calibrate every time the burner shuts down to compensate for increasing soot on the source and detector lenses. This means lenses can go up to nine times longer between cleanings!

Dirty lenses can cause high stack opacity shutdowns on previous, and competing opacity monitors. The JC-30D-EZ’s ability to auto-calibrate itself to adjust for dirty lenses makes a high opacity shutdown much less likely.

Congratulations to the R&D department for making the JC-30D-EZ best opacity monitor on the market. We especially want to share the good news with New York City, Boston, and elsewhere where opacity monitors are required by code. The new JC-30D-EZ can be retrofitted to older JC-30 opacity monitors, and it can replace existing Smoke Watchman units.

 

Read the original article here.

By Rich Kirby, Patch Staff Aug 12, 2019 1:30 pm ET

Preferred Utilities is headquartered in Danbury with facilities around the United States employing 90 people. Preferred Utilities is headquartered in Danbury with facilities around the United States employing 90 people. U.S. Senator Chris Murphy (D) announced Preferred Utilities Manufacturing in Danbury is this week’s “Murphy’s Monday Manufacturer.”

Founded in 1920, Preferred Utilities specializes in the manufacturing of burners, instruments and controls, and fuel oil handling equipment for industrial, commercial, and missions critical applications. The company does work for government and municipal buildings, hospitals, colleges and universities, data centers, pharmaceutical companies, waste management plants, and nuclear facilities.

“Preferred Utilities is leading the way in combating climate change by using alternative and renewable fuels to run their business and companies around the world are noticing. They are committed to the Danbury community through partnerships with local schools and charitable organizations. I’m happy to highlight them,” said Murphy in a release.

Preferred Utilities became the first company in the Northeast to convert its boilers to Bio-Residual Oil, which is produced from vegetable grease and animal fat, to power its 50,000 square foot facility in Danbury. They are also one of the first companies in Connecticut to convert its boilers to renewable fuel.

“Although founded in 1920, we moved to Danbury in 1946 and made it our home. Preferred is very attached and dedicated to the greater Danbury community and we employ some of the top people in our industry, born and raised in Connecticut. Because we are a family company, Preferred employs several generations of the same family, all Connecticut residents and members of the community,” said David Bohn, President and CEO of Preferred Utilities Manufacturing Company.

Preferred Utilities is active in the Danbury community, routinely offering internships to high school and college students in the area, and working with organizations like Danbury Hospital, St. Jude Children’s Cancer Hospital, New Pond Farm, and Danbury Music Center, according to the release.