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DS 439:2024 — the new standard for water systems

qd sizing, tightness testing, and what changed

2026-06-16·7 min reading

DS 439:2024 is the first real technical revision of the water standard in nearly 50 years. The simplified dimensioning method is abolished, dimensioning now takes place via the qd method, and there is a tightened requirement for pressure testing of empty pipes before they are hidden. Here are the main points you need to know.

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