Then she leaned back, listening to the positive pressure system hum.
It was the map.
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. api rp 752 pdf
She watched the old control room camera as the emergency shutdown valves closed remotely. A cloud formed — colorless, invisible on IR. But she knew it was there. And she knew: six months ago, she would have been standing in that cloud's path, in a building with a two-inch concrete wall and no overpressure rating. Then she leaned back, listening to the positive