Trap Primer Sizing
Primer / distribution-unit count, annual water use, and an IPC 1002.4 occupied-space compliance check for floor-drain trap seals. Manufacturer flow rates govern.
Formula and source
primers = ceil(floor-drain count / drains-per-distribution-unit). Annual water = drains × (delivery oz per cycle / 128) × cycles per day × 365. Occupied-space floor drains require a primer per IPC 1002.4.
IPC 2021 (International Plumbing Code). Section 1002.4 (trap seals). Manufacturer flow rates per published cut sheets (Precision Plumbing Products / Sioux Chief / Mifab).
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