DEWATERING IN EXTREME ENVIRONMENT: ANNULAR SEAL USE IN DEEP WATER WELDING REPAIR Phoenix International Holdings An innovative use of a Petersen Annular Seal in an extreme environment—almost one hundred feet down in the Gulf of Mexico—is interesting proof that the technology is effective in a great variety of situations, including those commonly found in municipal and industrial sewer and pipe networks. "We used the seal as part of a l

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