Calgary H2s Alive Training

The loss of the pin kept the valve in the open position. Former gasifier island project manager Brett Wingo said the incident could have resulted in a catastrophic explosion that might have burned down the gasifier and released poisonous hydrogen sulfide gas , which can cause on-site deaths in high concentrations from as little as one breath. He said an explosion would’ve been more likely had the gasifier been running at its designed operational pressure of 650 pounds per square inch. During recent testing, the gasifier has been running at 350 pounds per square inch. URS said Mississippi Power repaired the valve by welding what is known as a keystock on it to keep the pin from falling out and leaving it in an open position. “Describing a pin ‘falling out’ as something benign, natural or normal, like it’s acceptable, is absurd,” Wingo said. “Either the pin was not installed or properly secured during installation and/or not properly inspected prior to operation or during operation. Pins don’t just ‘fall out,’ not on critical applications like this.” Mississippi Power officials didn’t return a request for comment. COAL FEED: Lignite coal goes up the conveyor at right up to the coal feed system on top of the gasifier assembly (left). The incident occurred just a few weeks before Tom Fanning, the CEO of Mississippi Power’s corporate parent the Southern Company, assured investors on Oct. 31 that Kemper would meet its start date.

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