I had the pleasure of teaching another Advanced Course on Process Safety (40-hr). When discussing Relief Systems, their design, and their RAGAGEP(s), the UPWARDS and UNOBSTRUCTED piece got many questions.
ALL RAGAGEPs regarding PRDs will state “UPWARDS and UNOBSTRUCTED” or similar language.
Even the older OSHA standards uses the phrase “Upward and Unobstructed” in the following standards…