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Vent systems for six field units were sized using a procedure derived from earlier laboratory investigations. Three units were tested before occupancy, focusing on trap-seal reduction and pneumatic pressure excursions in selected vents. Preoccupancy results indicated satisfactory performance and a design procedure is presented to support plumbing designers and code update efforts.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/field-hydraulic-performance-of-one-and-two-story-residential-plumbing-systems-with-reduced-size-vents-nbsir-84-2860-report/663254/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/field-hydraulic-performance-of-one-and-two-story-residential-plumbing-systems-with-reduced-size-vents-nbsir-84-2860-report/663254.png","ImageObject",300,407,{"name":92,"@type":93},"Danger Angel","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-10-28",true,{"@type":102,"interactionType":103,"userInteractionCount":81},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What systems and vents were tested in the field study?","Question",{"text":112,"@type":113},"The report tests drain-waste-vent systems with reduced-size vents installed in single-family housing units. Six field units had their vent systems sized for the study, and three units received preoccupancy testing.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What were the principal measurements during preoccupancy tests?",{"text":117,"@type":113},"The principal measurements were trap-seal reduction and pneumatic pressure excursions in selected vents, using laboratory test procedures adapted to field conditions.",{"name":119,"@type":110,"acceptedAnswer":120},"What is the report’s main outcome for reduced-size vent design?",{"text":121,"@type":113},"The preoccupancy tests showed satisfactory performance with reduced-size vents, and the report presents a procedure for designing reduced-size vent systems for plumbing designers and groups updating plumbing codes.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},663254,1793226041,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":81,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":129,"read_time":144},962090769052,"https://ap-avatar.wpscdn.com/davatar_9964176cb1d06d4a9deccf72a44ae3dc","|  |  | A1.1.10b 26口?05   |\n| --- | --- | --- |\n| Reference   | NBS  \u003Cbr>PUBLICATIONS   |  |\n\nQC  \n100  \n.U56  \nNO.84-2860  \nuPoRmM  \nNBSIR 84-2860  \nField Hydraulic Performance ofOne-and Two-Story ResidentialPlumbing Systems WithReduced-Size Vents  \nRobert S.Wyly  \nPlumbing Consultant  \nand  \nLawrence S.Galowin  \nU.S.DEPARTMENT OF COMMERCENational Bureau of StandardsCenter for Building TechnologyBuilding Equipment DivisionGaithersburg,MD 20899  \nMay 1984  \nIssued October 1984  \nSponsored byTri Services,Department of Defense,  \nand  \nDepartment of Housing and Urban Development  \n5  \nNATONAL BUREAURQC103us6110.841-58601984/  \nOF STANDARDS.  \nLIBRARY  \n6e  \nFIELD HYDRAULIC PERFORMANCE OFONE-AND TWO-STORY RESIDENTIALPLUMBING SYSTEMS WITHREDUCED-SIZE VENTS  \nRobert S.Wyly  \nPlumbing Consultant  \nand  \nLawrence S.Galowin  \nU.S.DEPARTMENT OF COMMERCENational Bureau of StandardsCenter for Building TechnologyBuilding Equipment DivisionGaithersburg,MD 20899  \nMay 1984  \nIssued October 1984  \nSponsored byTri Services,Department of Defense,  \nand  \nDepartment of Housing and Urban Development  \n# ABSTRACT\n\nThis report describes hydraulic tests of drain-waste-vent systems withreduced-size vents installed in single-family housing units at Andrews AirForce Base,Camp Springs,Maryland.The vent systems of six field units weresized according to a procedure based on findings in prior laboratory investi-gations.The tests reported were conducted on three of the units before occu-pancy.Principal measurements made were trap-seal reduction and pneumaticpressure excursions in selected vents,using laboratory test procedures adaptedto field conditions.Results of the preocupancy tests showed satisfactoryperformance with the reduced-size vents.A procedure for the design of reduced-size vent systems is presented that provides methods for plumbing designers andgroups engaged in updating plumbing codes.  \n# ACKNOWLEDGMENTS\n\nThe program described in this report originated in response to a technicalimplementation proposal prepared by Robert s.Wy1y¹for Paul Land,Directorateof Civil Engineering,U.S.Air Force.The work was conducted under the admin-istrative direction of Lawrence s.Galowin.Mary Jane(Orloski)Phillips2directed activities relating to the design,and installation of the reduced-size vents,planned and conducted the preoccupancy tests,and prepared a draftreport presenting the results.The design,development and installation ofthe automated data acquisition system and instrumentation package was directedby Richard A。Grot,assisted by Lynn Schuman.Robert W.Beausoliel,Grover C.Sherlin,Jr.and Robert s.Wyly contributed recommendations on instrumentationdesign and measurement procedures.Members of the NBS Instrument Shop areacknowledged for their work in constructing some of the special sensors.Assistance in the evaluation of the as-built systems to determine conformanceof the drainage piping to the appropriate model plumbing code was provided byGeorge Williams,Chief Plumbing Inspector,Fairfax County,VA.,and by DeeRathbone,Plumbing Engineer.  Capt.Kenneth Hanna(USAF)provided liaisonbetween the NBS project staff,the Andrews Air Force Base Civil EngineeringOffice,the plumbing contractor,and the occupants of the test houses.  \nRobert S.Wyly and Lawrence S.Galowin expanded the initial draft reportprepared by Mary Jane(Orloski)Phillips and consolidated the design criteriain the appendices from other NBS reports.  \nThe work was first sponsored by the Directorate of Civil Engineering,U.S.AirForce and later by the Building Research Committee of the Tri Services.Asignificant portion of the project costs to obtain field data on water usageand frequency of fixture operation was borne by the NBS Center for BuildingTechnology.The preparation of this report was sponsored by the Department ofHousing and Urban Development.  \nTABLE OF CONTENTS  \nABSTRACT ……      …·..         …    iiiACKNOWLEDGEMENTS ….·              ivTABLE OF CONTENTS ……·                 VLIST OF TABLES .…      ","cbCaimhknVLvhIvr","https://ap.wps.com/l/cbCaimhknVLvhIvr","pdf",5620965,110,"English","# ABSTRACT\n# ACKNOWLEDGMENTS\n# TABLE OF CONTENTS\n## 1. INTRODUCTION\n## 1.1 OBJECTIVE AND SCOPE OF PROGRAM\n## 1.2 BACKGROUND\n## 1.3 PERFORMANCE CONCEPTS AND GENERAL APPROACH\n## 2. SIZING OF VENTS\n## 2.1 SIZING CRITERIA\n## 2.2 APPLICATION OF RSV CRITERIA TO THREE DWV DESIGNS\n## 3. INSTALLATION AND TESTING OF RSV SYSTEMS IN THE FIELD\n## 3.1 ORGANIZATION AND SEQUENCE OF PROJECT ACTIVITIES\n## 3.2 INSTALLATION OF INSTRUMENTATION AND REDUCED-SIZE VENTS\n## 3.3 EVALUATION METHODOLOGY\n## 3.4 DATA SUMMARY AND DISCUSSION\n## 4. CONCLUSIONS\n## 4.1 ADEQUACY OF PERFORMANCE OF THE RSV SYSTEM\n## 4.2 COST CONSIDERATIONS\n## 4.3 RESIDUAL ISSUES AND CODE ACCEPTANCE\n## 5. REFERENCES\n## APPENDIX A. PREOCCUPANCY TESTS: DETAILED INFORMATION","[{\"question\":\"What systems and vents were tested in the field study?\",\"answer\":\"The report tests drain-waste-vent systems with reduced-size vents installed in single-family housing units. Six field units had their vent systems sized for the study, and three units received preoccupancy testing.\"},{\"question\":\"What were the principal measurements during preoccupancy tests?\",\"answer\":\"The principal measurements were trap-seal reduction and pneumatic pressure excursions in selected vents, using laboratory test procedures adapted to field conditions.\"},{\"question\":\"What is the report’s main outcome for reduced-size vent design?\",\"answer\":\"The preoccupancy tests showed satisfactory performance with reduced-size vents, and the report presents a procedure for designing reduced-size vent systems for plumbing designers and groups updating plumbing codes.\"}]","Field Hydraulic Performance of One- and Two-Story Residential Plumbing Systems With Reduced-Size Vents - NBSIR 84-2860 - report | PDF",277]