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PG 18-10 – PLUMBING DESIGN MANUALMay 1, 2021TABLE OF CONTENTSTABLE OF CONTENTS . i1GENERAL REQUIREMENTS . 11.1PURPOSE . 11.2RESPONSIBILITY . 11.3SUSTAINABLE DESIGN . 21.4COMMISSIONING . 21.5METERING . 21.6NATIONAL CODES AND STANDARDS. 21.7VA HOSPITAL BUILDING SYSTEM . 31.8VA DESIGN STANDARDS . 31.8.1Master Construction Specifications (PG-18-1). 31.8.2Design and Construction Procedures (PG-18-3) . 31.8.3Standard Details and CAD Standards (PG-18-4). 31.8.4Equipment Guide List (PG-18-5). 41.8.5Design Manuals (PG-18-10). 41.8.6Design Guides (PG-18-12) . 41.8.7Barrier Free Design Standard (PG-18-13). 41.8.8Design Submission Requirements (PG-18-15) . 41.8.9Design and Standards Alerts . 41.8.10 VA Building Information Modeling (BIM) Guide . 51.8.11 Seismic Design Requirements (H-18-8) . 51.8.12 Signage Design Manual . 51.8.13 Cultural Resource Management Procedures (H-7545) . 51.9ADDITIONAL DESIGN CRITERIA AND STANDARDS . 51.9.1National Fire Protection Association (NFPA) . 51.9.2Centers for Disease Control and Prevention Biosafety in Microbiological andBiomedical Laboratories (CDC BMBL) . 51.9.3Implementing Instructions: Federal Agency Implementation of WaterEfficiency and Management Provisions . 51.9.4Architectural Barriers Act Accessibility Standards (ABAAS). 51.9.5Sustainability and Historic Federal Buildings . 61.9.6National Environmental Policy Act (NEPA) . 61.9.7National Historic Preservation Act (NHPA) and related standards. 61.10COORDINATION. 61.11LOCAL CODES AND REQUIREMENTS . 61.11.1 Local Utility Providers . 71.12PROJECT SPECIFIC REQUIREMENTS AND INFORMATION . 71.12.1 VA Provided Materials . 71.12.2 Proprietary Items . 71.12.3 Computer Aided Facilities Management Requirements (CAFM). 72PLUMBING DESIGN CRITERIA . 92.1TEST PRIOR TO DESIGN . 9TABLE OF CONTENTSi

PG 18-10 – PLUMBING DESIGN MANUALMay 1, 2.8.62.8.72.92.10EQUIPMENT PADS . 9PIPING. 9PIPE SUPPORT DESIGN . 9BASE AND VIBRATION ISOLATORS . 9FREEZE CONDITIONS . 10SEISMIC REQUIREMENTS . 10CONTRACT DRAWINGS. 10General . 10Basic Design Parameters . 10Plumbing Fixture Numbers . 11Symbols and Abbreviations . 11Cross Sections. 12Stack and Riser Diagrams . 12Equipment Schedules . 12INTERDISCIPLINE COORDINATION . 12CALCULATIONS AND REVIEW SUBMITTALS . 133PLUMBING FIXTURES, FAUCETS, FITTINGS AND EQUIPMENT . 143.1PLUMBING FIXTURES . 143.1.1General . 143.1.2Bariatric Plumbing Fixtures . 163.2SPECIAL EQUIPMENT . 163.2.1Dialysis Machines . 163.2.2Heart and Lung Machines . 163.2.3Distilled Water Stills . 163.2.4Sterilizers . 173.2.5Film Processing Areas. 173.2.6Chemical Fume Hoods. 173.2.7Kitchen Equipment . 173.2.8Trash Room/Loading Dock . 173.3ELECTRIC WATER COOLERS . 173.4REDUCED-PRESSURE BACKFLOW PREVENTERS . 183.5PLUMBING FIXTURE SCHEDULE . 184WATER SUPPLY AND DISTRIBUTION . 214.1GENERAL. 214.2DOMESTIC HOT WATER SYSTEMS . 214.2.1Water Heater Efficiency . 224.2.2Water Heaters for Patient Care and Research Buildings . 224.2.2.1 Instantaneous and Semi-Instantaneous Water Heaters. 234.2.2.2 Tank-Type Water Heaters . 234.2.2.3 Dietetic Equipment . 234.2.2.4 Booster Heaters . 234.2.3Water Heaters for Non-Patient Care Buildings . 244.2.4Instantaneous Tankless Water Heaters (Point of Use) . 24TABLE OF CONTENTSii

PG 18-10 – PLUMBING DESIGN MANUALMay 1, 5.14.5.24.5.34.5.44.5.54.5.5.14.5.5.24.5.6Sizing of Water Heaters. 24Thermostatic Mixing Valves . 24Hot-Water Recirculation Loops and Return Piping . 25Shut-Off and Balancing Valves . 26Heat Traps . 26DEVICE CALIBRATION . 27GENERAL PIPING DESIGN GUIDELINES . 27Definitions . 27Requirements for Piping Systems . 27LEGIONELLA MITIGATION IN VA FACILITIES . 29Purpose . 29Background . 30Piping Design Guidelines for Legionella Mitigation . 31Supplemental Water Disinfection Methods . 32Emergency Water Disinfection Methods . 33Thermal Eradication . 33Shock Chlorination . 33Special Use Water Systems (e.g., hemodialysis, laboratory, pharmacycompounding) . 344.6INSPECTIONS AND WITNESS OF TESTS . 344.7WATER DISTRIBUTION SYSTEMS . 344.7.1Metering for Use . 344.7.2Measuring and Indicating Devices . 354.7.3Water Hammer Arrestors. 354.7.4Trap Primers . 354.8WALL HYDRANTS . 364.9COORDINATION. 364.10BACKFLOW PREVENTERS. 364.10.1 Reduced Pressure Backflow Preventers . 364.10.2 Atmospheric Vacuum Breakers . 364.10.3 Hose Connection Vacuum Breakers . 374.10.4 Fire Sprinkler Systems and Standpipes . 374.11PRESSURE-REDUCING VALVES . 374.12DOMESTIC WATER BOOSTER SYSTEMS. 374.12.1 Minimum Pressure . 374.12.2 Patient Care Buildings . 384.12.3 Non-Patient Care Buildings . 384.13SOLAR DOMESTIC WATER HEATING . 384.13.1 Basic Solar System Design . 394.13.2 Simple System Calculation . 405SANITARY DRAINAGE SYSTEMS . 415.1SANITARY DRAINAGE . 415.1.1Pipe Design . 41TABLE OF CONTENTSiii

PG 18-10 – PLUMBING DESIGN MANUALMay 1, 20215.1.2Floor Drains . 415.1.3Fixture Units . 415.1.4Sanitary Connections . 415.1.5Fats, Oil, and Grease (FOG) Removal Systems . 425.1.6Dialysis Sanitary Drains . 425.1.7Waste Neutralization Systems . 425.1.8Chemical-Resistant Piping . 435.1.9Cast Iron Piping . 435.1.10Cleanouts . 435.1.11Waste and Vent Systems . 435.2GRAY WATER RECYCLING SYSTEM . 445.3SCHEDULE OF FLOOR DRAINS . 446BUILDING STORM DRAINAGE SYSTEMS. 506.1STORM SYSTEM DRAINAGE. 506.2ROOF DRAIN LEADER INSULATION . 506.3CALCULATIONS . 506.4STORM CONNECTIONS. 506.5SCHEDULE OF AREA/ROOF DRAINS . 506.6LOCATION OF DRAIN LEADERS. 506.7UNDERSLAB AND FOUNDATION DRAINAGE . 506.8RAIN WATER HARVESTING SYSTEM . 507SPECIALTY TRAPS, INTERCEPTORS, AND SEPARATORS . 527.1SAND/GRIT TRAPS . 527.2OIL/WATER INTERCEPTORS . 527.3GREASE INTERCEPTORS. 527.4PLASTER TRAPS/INTERCEPTORS . 527.5CONTAMINATED WATER AND SANITARY WATER RETENTION. 528MEDICAL GASES AND VACUUM . 548.1GENERAL . 548.1.1Water Cooled Equipment . 548.1.2Renovation Projects . 548.2MEDICAL GAS AND VACUUM SYSTEMS . 548.2.1Oxygen, Medical Compressed Air, Medical Vacuum, Nitrous Oxide, NitrogenSystems, Carbon Dioxide, Waste Anesthesia Gas Disposal and InstrumentAir . 548.2.2Central Supply Systems . 548.2.2.1Sizing the Systems . 558.2.2.2System Setup. 558.2.3Piping Systems . 578.2.4Alarms .