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During the cooking process, gases are released from the chemical reactions occurring within the digester. These gases are continuously vented during cooking to a collection system of condensers and separators. This system recovers the heat and useful pulping byproducts, including turpentine. At the completion of the cooking process, the digester is discharged to a special tank called a blow tank. The blow tank is designed to receive the pulp and capture and recover the tremendous amount of gases and heat that are released during the blow. To discharge the digester, a blow valve at the bottom of the digester opens to release the contents to a blow pipe or blow line. The pressure in the digester pushes the hot pulp and liquor through the blow line to the blow tank.