For ten years, Building 43 had been her control room. It sat 150 feet from the alkylation unit, a gray box of reinforced concrete, its windows sealed, its door an airlock. After the API RP 752 audit last quarter, the company had painted a bright green evacuation route on the floor and installed blast-resistant film on the glass. But Mara knew the real change wasn't the film.
She typed into the log: "Release contained. No injuries. Occupied building exposure: none — per 752 relocation plan."
Mara tapped the laminated card pinned to her hard hat. It read: "Safe Haven — Building 43." api rp 752 pdf
Then the low-pressure alarm on Reactor 7 chirped.
It was the map.
She pulled up the feed. A gasket on a 4-inch line was weeping, then spraying. Propane. The wind was blowing southeast — directly toward the old building.
"Dispatch, Reactor 7 release," she said, calm. "Initiate ESD-2." For ten years, Building 43 had been her control room
Outside, the vapor cloud dissipated. Inside the old control room, a single monitor still glowed — showing the bunker, safe and distant, where the shift lived on. Based on real-world guidance from API RP 752 (3rd Edition), which emphasizes risk evaluation, building siting studies, and mitigation for existing occupied buildings in process plants.