Pipe Sizing for Storm Drain Performance - Insights from the IAPMO/ASPE White Paper скачать в хорошем качестве

Pipe Sizing for Storm Drain Performance - Insights from the IAPMO/ASPE White Paper

Join IAPMO experts Dan Cole and Christoph Lohr for a technical exploration of storm drainage system design and the critical equations engineers need to calculate effect flow rates through piping. Among the key insights is the impact of pipe material on flow velocity. For instance, PVC and cast iron pipes of the same size can have vastly different flow capacities. Dan and Christoph discuss the key differences between the Manning and Darcy-Weisbach equations, why current plumbing code tables may not tell the whole story, and how proposed code changes could give designers more accurate tools for material selection. In an era where storms are increasing causing urban flooding from excessive rainfall events, this episode will help engineers to make informed decisions for accurate storm drainage system sizing and ensure optimal performance and longevity. Related Links: Download the white paper, peer-reviewed by 11 industry experts: IAPMO/ASPE White Paper 2-2024, "Capacities of Stacks and Horizontal Drains in Storm Drainage Systems: https://www.iapmo.org/media/l03hu5if/... Key highlights from this episode: 🕒01:51 What the storm drainage calculator is from the white paper 🕒02:26 What is flow capacity--the flow rate through a pipe that flows freely by gravity. Equations compute the capacities and calculate velocities and flow rates. 🕒04:06 The white paper is structured around three types of equations. One for the vertical pipe equations and two for the horizontal equations, the Manning equation and the Darcy Weisbach equation. The equation for the vertical piping doesn't have a common name, but it was derived by the National Bureau of Standards, so it the Wiley Eaton equation. 🕒05:12 Detailed instructions on how to use the calculator tables 🕒09:12 Differences between PVC pipe and cast iron pipe on flow rate 🕒14:16 Changing weather patterns are not directly addressed in the white paper, but may have an impact on future code development 🕒19:27 If a system designer uses cast iron pipe, but follows the table for PVC capacities, that pipe is going to be way undersized 🕒20:23 Ponding is a huge issue for structural roof conditions, so accurate sizing for the roof drainage system to keep up with the flow capacity is imperative