Location

MOA Training Room
4700 Elmore Rd,
Anchorage AK, 99507

Cost

Free

Description

Flow Through Expansion Tanks and Legionella Mitigation

Join us for this joint meeting with IAPMO, for a presentation that explores the critical relationship between domestic hot water system design and Legionella risk mitigation, emphasizing how flow‑through expansion tanks improve water quality, safety, and regulatory compliance in modern buildings. It begins by outlining the environmental conditions that enable Legionella growth—including stagnation, favorable temperature ranges, and nutrient availability—while identifying common system vulnerabilities such as dead legs, oversized piping, and poor circulation. The session introduces the multi‑port flow‑through expansion tank, explaining its internal flow path, baffle‑controlled turbulation, and ability to maintain continuous circulation through the tank, thereby eliminating the stagnant water associated with traditional single‑port designs. Attendees are guided through relevant standards and regulatory drivers, including ASHRAE 188, CDC guidance, and Wisconsin legislation requiring flow‑through expansion tanks in certain healthcare applications. The presentation further addresses temperature management, flow considerations, tank sizing, and piping strategies—including parallel tank arrangements—to support safe and efficient system performance. By the conclusion, participants gain a comprehensive understanding of how thoughtful expansion tank selection and system design can significantly reduce bacterial risk, enhance occupant safety, and support best‑practice water management in commercial buildings. 

RSVP

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