The Art of the Flush - Plumbing Engineer

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pe07_pgs_40_45rev:Layout 1 6/25/10 9:08 AM Page 42 HeatingHelp.com Continued from page 40 “Have you ever noticed,” I said, “how blowing and sucking sound about the same” “Wadda ya mean” Smokey asked. “I mean how air, when moving quickly through a hole, makes about the same sound, whether it’s going this way or that way. Blowing or sucking Ever notice that” “Can’t say as I have,” Smokey said. He lit another smoke, blew out, and once again, the Bud vent sucked it right in. “Do you know about the point of no pressure change How it’s at the place where the compression tank is And if you pump toward that point with a big enough pump, or with, say, six pumps piped in series, stem to stern like this, you’re going to get quite a negative pressure on the suction side of that pump. Or pumps.” “Huh” “Blow some more smoke that way,” I said, pointing to the Bud vent. He did. The vent sucked in the smoke nearly as quickly as Smokey was blowing it out. “Wow!” Smokey said. “A system after my own heart!” “Now watch over here,” I said, pointing at the air separator. He did. “You won’t see the smoke come out because this isn’t a hookah.” “Huh” “You’re sucking in air because you’re pumping at the point of no pressure change with lots of pumps in series. The combined pump differential pressure is greater than the system’s static fill pressure. That’s why the vent is sucking. The air is probably eating this boiler. The air separator is trying its best to get rid of the air that the vent is sucking in,” I said. “Sucking and blowing.” “I hate that thing,” Smokey said. “Under the circumstances,” I said, “I think you should be thanking it.” “I hate it. You’re not going to help me get even by writing about this, are you” Smokey snarled. “I will when it’s time,” I said. “When’s that” “When you graduate,” I said. And now it’s time. n Dan Holohan began his love affair with the heating industry in 1970. Today, Dan writes a monthly column for Plumbing Engineer’s sister publication, Phc News. He’s written a dozen popular books on subjects ranging from steam heating to teaching technicians. From Maine to Hawaii, and from Florida to Alaska, Dan has taught more than 50,000 people at his seminars. He is well known throughout the heating industry for his entertaining, anecdotal style of speaking. The views and opinions expressed in this column are those of the author and do not reflect those of Plumbing Engineer nor its publisher, TMB Publishing. Precision Plumbing Products “Specify with Confidence - Install with Pride”® TRAP PRIMING BRING IT ON WATER CONSERVATION IS OUR FIRST PRIORITY 40 MODELS PRESSURE DROP ELECTRONICS FLUSH VALVE WATER CLOSET UNDER LAV 38 ACCESSORIES 40 Years of Manufacturing Excellence Precision Plumbing Products Division of JL Industries, Inc. 6807 NE 79th Court, Suite E - Portland, Oregon 97218 T (503) 256-4010 - F (503) 253-8165 - www.pppinc.net Made in the U.S.A. 1018 1044 We do not Export Jobs. U.S.GREEN BUILDING COUNCIL USGBC ® Rev 07/09 Circle 32 on Reader Reply Form on page 114 Page 42/Plumbing Engineer July 2010
pe07_pgs_40_45rev:Layout 1 6/25/10 9:08 AM Page 43 6 Zero or even below, the Woodford 65/67 series commercial wall hydrants will tolerate any temperatures without freezing. All drain automatically, even with a hose attached. The 67 models include an ASSE Standard 1052 approved backflow preventer connection…and all come with Woodford quality, durability, and the ability to tolerate anything Mother Nature can throw at them. WOODFORD 65/67 SERIES FREEZELESS WALL HYDRANTS Model 67 Freezeless Wall Hydrant with backflow prevention The ASSE 1052 approved double check is field testable. Designed to complement modern architecture. The Model 65 offers the same features with an ASSE 1019 vacuum breaker. RB67 Round Box Freezeless Wall Hydrant Fits through standard 6" diameter cored hole. Supplied with a ASSE 1052 approved double check backflow preventer that is field testable. Designed especially for tilt-up wall construction. Also available as the RB65 with ASSE 1019 approved vacuum breaker. B67 Freezeless Wall Hydrant with double check backflow protection A rectangular version of our RB67, with backflow prevention. Also offered as the B65. WOODFORD MANUFACTURING COMPANY 2121 Waynoka Road Colorado Springs, CO 80915 800.621.6032 www.woodfordmfg.com Choose from backflow prevention (67 series) or anti-siphon vacuum breaker (65 series) hose connections. Circle 33 on Reader Reply Form on page 118
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