David Bohn, of Redding, CT, serves as president and CEO of Preferred Utilities Manufacturing Corporation in Danbury, CT. His previous experience with the commercial and industrial equipment manufacturing company includes work as a district sales manager and marketing coordinator. In 2016, David Bohn led his team in joining one of their industry’s premier professional organizations, the Council of Industrial Boiler Owners (CIBO).
CIBO works to represent the interests of makers of non-utility energy systems while promoting long-term best practices in supplying safe, cost-effective, and sustainable energy in today’s global markets.
Recently, the organization has dedicated particular efforts to fostering industry practices in keeping with environmental good stewardship. Among its upcoming events is a conference scheduled to take place in Arlington, Virginia, on September 11-12, 2018, one month before the CIBO annual meeting.
The September event focuses on the management of environmental and energy issues to increase sustainability. Organizers point out that the event aims to be the first of its kind to take a comprehensive look at practical, nuts-and-bolts energy and environmental procedures as they affect institutional strategic planning around sustainability.
Attendees can expect to learn more about emerging and alternative energy-related technologies, and about specific issues that include micro-grids, distributed energy, environmental ISO standards, and more.
As the president of Preferred Utilities Manufacturing Corporation, Redding, CT-based industrial equipment professional David Bohn led the fuel oil and boiler equipment manufacturer to a 380 percent increase in annual corporate revenue. In addition to his administrative accomplishments, David Bohn has expertise in multiple technical areas including the prevention of dry firing in boilers.
A big problem in the boiler industry, dry firing occurs when something interferes with the regular supply of boiler feedwater. If the boiler runs out of water, and safety features fail to engage, steam pressure will soon drop to zero. Although the true cause of this drop is a complete lack of boiling water (and, therefore, steam), the boiler will automatically attempt to make up for the lack of steam pressure by increasing internal temperature. Within minutes, high temperatures can irreparably damage the boiler due to a phenomenon called metal creep.
Boiler owners and/or operators can reduce the risk of dry firing by ensuring that advanced safety controls are set to trip the boiler offline when water supply is interrupted. They can also prevent dry firing by installing header-pressure transmitters on variable-speed-drive pumps, monitoring stack temperature closely, and performing regular automated low-water cutout tests.
Preferred Utilities Manufacturing Corporation
Since 1995, David Bohn has served as president of Preferred Utilities Manufacturing Corporation in Danbury, near Redding, CT. David Bohn draws on a 30-year history with the Redding, CT-area company, during which time he has gained an in-depth knowledge of boilers and the risk of dry-firing.
A boiler depends on balanced temperature and pressure levels to operate correctly. If a boiler ever becomes empty of water, pressure drops to zero and the boiler works harder to restore pressure. The lack of water leads the boiler to overheat and can permanently damage the metal mechanism, assuming an emergency feedwater pump does not first introduce cold water to the hot metal and cause an explosion.
Testing and monitoring are key to the prevention of dry-firing. Contemporary controller systems have mechanisms for monitoring stack temperature, so that excess heat would prompt a shutoff. Similar shutoff procedures may occur with automated low water testing.
Plant owners can also help to prevent dry-firing by installing redundant feedwater pumps, which engage in the case of pump failure and can help the mechanism avoid drying. Similarly, a feedwater header-pressure transmitter can emit an alarm and engage a second pump if pressure drops, thus reducing the chance of a dry boiler.
The president of the Preferred Utilities Manufacturing Corporation, David Bohn directs new product development and handles corporate revenue and growth efforts. David Bohn took the helm as president after joining the company’s Redding, CT, office and working his way up the ranks. He has spearheaded a number of projects in his leadership role, including the development of the Advanced Performance Inject-Aire (API-AF) Low NOx Burner.
The API-AF offers extensive fuel-burning capability and an impressive efficiency that significantly reduces greenhouse gas emissions and the overall carbon footprint of users. Designed to produce a stable flame regardless of firing rate, the burner can fire a range of fuel oils and natural gas. It incorporates variable-frequency drive motor controllers for enhanced control of the forced-draft fans, which in turn provides more air for combustion and results in a reduction of energy consumption.
Preferred Utilities engineers constructed the burner for use in single-burner applications, such as cast iron sectionals, watertube boilers, and high temperature hot water (HTHW) generators. Its installation at the Stapleton Houses managed by the New York City Housing Authority has contributed to prolonged boiler life, a reduced carbon footprint, and increased electrical and fuel savings. In addition, the API-AF limits NOx emissions and meets compliance standards for Local Law 87, a green building and energy efficiency ordinance set forth by the New York Mayor’s Office of Sustainability.
For additional information on the burner, visit preferred-mfg.com/products/wn/API-AF-Burner.