Confined Space Entry — "It Tested Safe This Morning"
Read this first. This note is awareness and toolbox-talk support — it is not training-of-record. Nothing here authorises an entry, replaces your site permit-to-work procedure, or substitutes for a competent gas tester and a written rescue plan. Getting a piping lesson wrong over-designs a support. Getting this one wrong has a different consequence class.
A 45 m³ separator is down for a shutdown clean. It was steamed, washed and left open overnight. At 07:50 the authorised gas tester lowers his probe through the top manway, waits for the reading to settle and writes it on the permit: O₂ 20.9 %,…
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