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Plumbing codes (IPC, UPC, NSPC) regulate safe water supply, drainage, and venting installations, ensuring adherence to health standards. Key abbreviations include DFU (Drainage Fixture Units), PDI (Plumbing Drainage Institute), AAV (Air Admittance Valve), and VTR (Vent Through Roof). Compliance with local, state, and national codes is mandatory.
Primary Plumbing Codes and Standards Plumbing systems in the US are generally governed by two main model codes, which are adopted and modified by local jurisdictions: International Plumbing Code (IPC): Published by the International Code Council (ICC). Uniform Plumbing Code (UPC): Developed by the International Association of Plumbing and Mechanical Officials (IAPMO). National Standard Plumbing Code (NSPC): Published by the Plumbing-Heating-Cooling Contractors Association. Other Standards: ADA (Americans with Disabilities Act) for accessibility, and Energy Codes for efficiency.
Common Plumbing Abbreviations: AAV: Air Admittance Valve ABG: Above Grade AFF: Above Finish Floor BFP: Backflow Preventer BT: Bath Tub CO: Cleanout CW/HW: Cold Water / Hot Water CWS/HWS: Cold Water Supply / Hot Water Supply DFU: Drainage Fixture Units EWC: Electric Water Cooler F.G.: Finish Grade GPM: Gallons Per Minute HB: Hose Bibb ID/OD: Inside Diameter / Outside Diameter IPS: Iron Pipe Size PDI: Plumbing Drainage Institute RD: Roof Drain RPBP: Reduced Pressure Backflow Preventer SOV: Shut-off Valve SS: Sanitary Sewer or Stainless Steel TPU: Trap Primer Unit VTR: Vent Through Roof WC: Water Closet
Essential Definitions & Concepts Backflow Preventer: A device that stops contaminated water from entering the potable water supply. Building Drain: The lowest piping that collects waste and carries it to the building sewer. Cleanout: An accessible opening in the drainage system used to remove clogs. Cross-Connection: Any physical connection between a potable water system and a source of contamination. Plumbers Tape: A perforated strap used to hang pipe, though often not accepted as permanent support.
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