Trap-Seal Protection Check
Within-limit pass/fail and percent of the permitted trap-to-vent distance used.
Example
You enter
- Developed trap-to-vent distance (ft) 6
- Permitted maximum (ft, from adopted table) 8
- Trap-seal depth (in) 2
You get
- Percent of permitted used 75%
Checked against published worked examples from: IPC/UPC §1002 (trap-to-vent).
Details, formula, and sources
ScopeWith a self-/induced-siphonage flag when the vent is inadequate. Per IPC §1002 / UPC §1002; the permitted maximum is user-supplied from the adopted table.
Formula or tablePass if the developed trap-to-vent distance <= the code-permitted maximum for the drain diameter; percent used = distance / permitted x 100; siphonage risk when the vent is inadequate or the trap seal is below the 2 in IPC 1002 minimum.
Source and editionIPC §1002 (trap seals) and §906 / Table 906.1 (trap-to-vent distance); UPC §1002 / Table 1002.2, by name.
Free accessFree read-only at codes.iccsafe.org; the AHJ-adopted edition governs.
What governsEstimate. AHJ and licensed plumber / gas fitter govern. Verify against the IPC / IFGC edition adopted in your jurisdiction.
API field namesdeveloped_distance_ft, table_max_ft, trap_seal_in, percent_used
- Permitted maximum user-supplied from the adopted trap-to-vent distance table for the drain diameterIPC/UPC §1002
- Scope S-traps are out of scope; the standard trap seal is ~2 inplumbing practice