HVAC & PLUMBING TRADE TALK

O C T O B E R 2 0 0 8

News for the Commercial, Residential and Wastewater Trade

Incredible Performance. Times three.
	Introducing the newest members our three speed family, the NRF-25 & NBF-25. The addition of these new models completes our line of three speed wet rotor circulators for residential and light commercial heating and domestic water applications. Available in cast iron and bronze construction, both models may accept an optional check valve to be mounted on the discharge nozzle. In addition to the great performances in any speed, these models are backed with the best 3-year warranty in the business. Our three speed family now consists of NRF/NBF-25, NRF/NBF-36, and NRF/NBF-45. Try one today!
Understanding Seismic Analysis
	Seismic Analysis or Earthquake Engineering is a type of structural analysis that approximates the response of a structure, such as a Heat Exchanger, to earthquakes. It is often a requested part of the structural design or structural assessment in regions where earthquakes are prevalent. Several different methods/codes exist which define how the structural analysis should be performed. Click here to learn more.
Quick Quiz: Impeller Rotation
	Looking at this impeller, which direction should it be turning? Direction "A" where the impeller "cups" the water or "B" where the impeller "slaps" the water? The correct answer is "B". If you run a centrifugal pump backwards, it will operate but at significantly reduced performance and it will be noisy. Single phase pumps are internally wired to turn in the correct direction. Three phase motors, however, can be wired so the pump accidently runs backwards. The problem can be corrected by switching any two of the three leads. Be advised, some pump types can be damaged running them backwards so care should be taken during installation.
Bell & Gossett Announces 4th Quarter 2008 Educational Seminars
	The free training seminars are offered at Bell & Gossett’s Little Red Schoolhouse education center in Morton Grove, Illinois, a suburb of Chicago. The seminars are open to engineers, contractors and facility maintenance professionals. The three-day seminars cover a wide range of important topics. Upon completion of the courses, CEU credits are awarded to graduates. The courses include: Modern Hydronics: Basic Seminar (October 20-22, 2008) Modern Hydronics: Advanced Seminar (November 3-5, 2008) Design and Application (November 17-19, 2008) Large Chilled Water Systems Design (December 15-17, 2008) The Bell & Gossett education center is located just outside of Chicago, convenient to O’Hare Airport and major highways. Students who attend the Schoolhouse seminars are just minutes away from all that Chicago has to offer - sporting events, restaurants, shows, shopping and many other attractions. Since 1954, more than 55,000 engineers, contractors and installers have been trained in the Little Red Schoolhouse’s fully equipped learning center, while another 135,000 professionals have received training through B&G’s ‘traveling classroom program. Click here for more info.

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