![]() The principle of circuit venting is that the flow of drainage never exceeds a half-full flow condition. ![]() The venting method has long been recognized by the plumbing community and is included in the American Society of Plumbing Engineers Data Book. Hunter’s research at the National Bureau of Standards and reported in BMS 66. ![]() The research concluded that the single vent for the eight fixtures provided the necessary protection of the trap seal. Extensive research into the performance of circuit vented systems was conducted at the State University of Iowa. Circuit venting is one of these methods and it has been laboratory and field-tested, establishing a long history of satisfactory service. The IPC has a variety of methods that can be used to vent plumbing fixtures and traps. The Single Stack Vent System was introduced into the IPC in the 2012 e dition and is based on a drainage stack system in the c ity of Philadelphia (Pennsylvania) Plumbing Code, which has been used successfully in many multi-story and high-rise buildings for more than 100 years. The performance of the combination waste and vent system was verified in test s conducted at the Stevens Institute of Technology. The combination waste and vent system is based on the same premise as the circuit-vented system. The plumbing community has long recognized this venting method and it is included in the ASPE Data Book : A Plumbing Engineer’s Guide to System Design and Specifications. Hunter’s research and reported in BMS 66 ( a methodology for determining necessary pipe sizing by estimating maximum demand on the delivery and drainage systems ). In this last of a four-part series of articles, we look at the three remaining venting methods in the IPC: circuit venting, combination waste and vent systems, and single stack vent systems. The venting methods have also been field-tested, establishing a long history of satisfactory service. The methods have been laboratory tested to determine sizing and installation requirements that provide proper venting to a drainage system. You will find that these venting provisions offer the installer and designer different paths to achieving an adequately vented system, which could result in cost savings along with ease of installation in different types of construction.Ĭhapter 9 of the IPC describes a variety of methods to vent plumbing fixtures and traps. The various approaches to venting that are permitted in the 2021 IPC are described in this handy reference tool authored by Lee Clifton, senior director of PMG resources at the Code Council. The International Code Council is proud to distribute a helpful tool - Methods of Venting Plumbing Fixtures and Traps in the 2021 International Plumbing Code: Installation, Flexibility and Opportunity for Savings - to help expand your knowledge of the International Plumbing Code (IPC).
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