On August 3, 1987, a hydrogen explosion occurred at an ammonia production plant, where a welder was making maintenance repairs to defective piping. The welder was injured, but recovered from burns at a hospital. There was no damage to other personnel or the plant. Another explosion occurred at a styrene production plant on April 20, 1984. The explosion killed two employees, and injured two more seriously. The cause of the accident was that the seal on the man-head tank entry for a knock-out drum of a hydrogen compressor had failed, and about 30 kg of hydrogen leaked at high pressure.
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