{"id":"backflow-preventer","version":"0.1.0","classification":{"uniformat":"D2020"},"names":["Backflow preventer"],"aliases":["BFP","RPZ","DCVA","double check valve"],"pm_tasks":[{"task":"Disassemble RP backflow preventer and inspect seals and seats","frequency":"P1Y","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":99,"checklist":"Table 12-1 Domestic water system"},{"task":"Test backflow preventer after servicing","frequency":"P1Y","reference":"TM 5-692-1 Maintenance of Mechanical and Electrical Equipment at Command, Control, Communications, Computer, Intelligence, Surveillance, and Reconnaissance (C4ISR) Facilities: Recommended Maintenance Practices","url":"https://www.wbdg.org/FFC/ARMYCOE/COETM/tm_5_692_1.pdf","page":99,"checklist":"Table 12-1 Domestic water system"},{"task":"Full flow test backflow preventer at system demand","frequency":"P1Y","reference":"UFC 3-601-02 Fire Protection Systems Inspection, Testing, and Maintenance (7 October 2021, with Change 1, 18 April 2025)","url":"https://www.wbdg.org/FFC/DOD/UFC/ufc_3_601_02_2021_c1.pdf","page":46,"checklist":"Table 2-8 Backflow Prevention Device ITM Tasks"},{"task":"Inspect backflow assembly internally","frequency":"P5Y","reference":"UFC 3-601-02 Fire Protection Systems Inspection, Testing, and Maintenance (7 October 2021, with Change 1, 18 April 2025)","url":"https://www.wbdg.org/FFC/DOD/UFC/ufc_3_601_02_2021_c1.pdf","page":46,"checklist":"Table 2-8 Backflow Prevention Device ITM Tasks"}],"open_questions":["No service life yet: no published source that meets the sourcing policy states one. The maintenance tasks are sourced.","Some maintenance intervals come from TM 5-692-1, an Army manual for mission-critical (C4ISR) facilities; they may be tighter than typical commercial practice."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-22","canonical_url":"https://unfinished.one/c/backflow-preventer","versioned_url":"https://unfinished.one/c/backflow-preventer/v/0.1.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Backflow preventer, v0.1.0. https://unfinished.one/c/backflow-preventer/v/0.1.0"}