The engineering department of the Nizhnedneprovsk Pipe Plant has completed drawings and specifications for equipment designed to apply an enamel coating to the inside surface of pipes made in accordance with GOST 8731-74 and GOST 8732-78. A suitable technology that employs this equipment has also been developed. The pipes are made of steel 10-20 and have a diameter of 89-273 mm, wall-thickness of 5-12 mm, and length of 8-12 m.The thickness of the enamel coating is 0.3-0.4 m. A distinguishing feature of the new technology is that it is realized using relatively simple equipment occupying a limited area and requiring a minimum number of operations. Existing equipment is used in several of the operations, and the process can be fully mechanized.Enameled test specimens have met the hygiene standards currently in effect. The specifications for the enamel and the finished pipes were also developed in accordance with existing hygiene-sanitation standards.The pipes can be used in different sectors of the economy: for pumping oil and the accompanying corrosive components, as well as other aggressive media.The service life of the enameled pipes should be at least 20 yrs. The enameling technology is protected by a patent.Nizhnedneprovsk Pipe Plant.
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