تله خطا منجر به فاجعه می شود

توضیحات :

BEACON SAFETY MASSAGE

ایمنی فرآیند

ژانویه ۲۰۲۴

تله خطا منجر به فاجعه می شود

A fuel terminal was off-loading a large amount of gasoline from a ship to several storage tanks. The supervisor incorrectly estimated the time to fill one tank, and it overflowed into the containment (dike) area. Unfortunately, the valve to drain rainwater from the containment had been left open and the gasoline flowed out to the retention pond near the wastewater treatment (WWT) area. The pumps in the WWT area were not classified for flammable vapor. The vapors ignited, and the fire spread back toward the overflowing tank. A number of explosions and a facility-wide fire had catastrophic impacts on the plant, community and sensitive environmental areas around the terminal.

How did this happen?

The tank farm used both rising stem (Fig. 1) and fixed stem valves (Fig 2.) on the dike drains leading to the storm water retention pond in the WWT area. Rising stem valves allowed operators to easily see the valve position by observing the stem above the valve wheel (red arrow). Fixed stem valves do not provide a visual indication of the position (blue arrow): The stem does not rise above the handwheel when the gate is raised. It was difficult for operators to know the actual position of the fixed stem valve on the dike drain for the tank dike without physically turning it.

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