Uniformat D4010

Wet pipe sprinkler system

A wet pipe sprinkler system lasts about 32.5 years, the median of 6 published sources, which state 20–50 years.

Also listed as Sprinkler system, wet pipe, wet system, sprinkler, wet sprinkler

• Confidence C
• Version 0.6.0 (permanent link)
• Reviewed 2026-10-22

Service life

Years in service. The band runs from the shortest to the longest life the sources state, so it shows how much they disagree, not how long 80% of units last. The line is the median of the stated lives.

Work out when yours is due for replacement · Compare with what municipalities assume

Basis

• 50 years · CNA e-Tool Estimated Useful Life Table, p14 · HUD CNA 3.6.1.1 “Building fire suppression sprinklers, standpipes” — U.S. Department of Housing and Urban Development (planning life)
  Same life for family and elderly properties. US multifamily housing. Neither HUD nor the municipal rows separate wet from dry systems.
• 25 years · The Blue Mountains: POL.COR.19.04 Tangible Capital Assets Policy, p11 (accounting life)
  Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page.
• 40 years · Grey Highlands: By-law No. 2026-052, Tangible Capital Asset Policy A09-F-03, p11 (accounting life)
  Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page.
• 25 years · Meaford: By-law 2020-83, Tangible Capital Asset Policy, Appendix A Estimated Useful Lives, p17 (accounting life)
  Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page.
• 20 years · Amherstburg: Tangible Capital Assets Policy, Appendix A: TCA Categories, Life Years, and Thresholds, p8 (accounting life)
  Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page.
• 50 years · Parksville: Policy No. 6.16 Tangible Capital Assets, p9 (accounting life)
  Capital asset policy (amortization period). Approved on text check: the label and value were found on the cited page.

How sources are chosen and recorded: sourcing policy.

Preventive maintenance

23 tasks in 5 work orders. Intervals that fall due together are one visit: the every 10 years visit also covers the monthly, annual, every 2 years and every 5 years tasks.

1. 1Monthly
2. 2Monthly
3. 3Monthly
4. 4Monthly
5. 5Monthly
6. 6Monthly
7. 7Monthly
8. 8Monthly
9. 9Monthly
10. 10Monthly
11. 11Monthly
12. 12Annual

Months from the schedule start. Download the tasks as CSV for a CMMS, or ask the MCP tool get_pm_schedule for dated visits.

Frequencies are ISO 8601 durations in the data (P3M = every 3 months).

Open questions

• The sources disagree by a factor of two (20 to 50 years). Do the shorter municipal lives reflect accounting choices or real replacement?
• HUD gives planning lives for US multifamily housing; the municipal rows are Ontario accounting lives. Neither is observed replacement data.

Know the answer? Send it with a source to [email protected].

Cite this

Citation

unfinished.one (2026). Sprinkler system, wet pipe, v0.6.0. https://unfinished.one/c/sprinkler-wet/v/0.6.0

BibTeX

@misc{unfinished_sprinkler_wet_0_6_0,
  title = {Sprinkler system, wet pipe},
  author = {{unfinished.one}},
  year = {2026},
  version = {0.6.0},
  url = {https://unfinished.one/c/sprinkler-wet/v/0.6.0},
  note = {CC BY 4.0}
}

Licence CC BY 4.0 · How to cite · JSON · Versions: 0.6.0, 0.5.0, 0.4.0, 0.3.0, 0.2.0, 0.1.0