Abstract: A process for making plastic-lined metallic pipes for conveying liquid or gas includes the steps of heating a metallic pipe evenly to a first temperature; cooling a plastic pipe evenly to a second temperature; inserting the plastic pipe into the metallic pipe to constitute an inner sleeve; drawing the metallic pipe from its two ends; and cooling the sleeved pipe to a storage temperature. The pipe includes a continuous inner plastic sleeve and an outer seamless metallic pipe. The outer diameter of the plastic sleeve is circumferentially melt-bonded to the inner diameter of the outer pipe. The plastic sleeve constitutes an uninterrupted lining for the metallic pipe.

Abstract: A connector used for connecting the plastic metallic pipe includes a body, a cap, and three washers. The body has a section of thread in its outer wall for coupling with the cap which has a section thread in its inner wall. In operation, first insert the pipe into the cap, then insert the rubber washer, the metallic washer, and spring washer into the body, and then screw the cap into the body, such that the pipe is locked with the body.

Abstract: A process for making plastic-lined metallic pipes for conveying liquid or gas includes the steps of heating a metallic pipe evenly to a first temperature; cooling a plastic pipe evenly to a second temperature; inserting the plastic pipe into the metallic pipe to constitute an inner sleeve; drawing the metallic pipe from its two ends; and cooling the sleeved pipe to a storage temperature. The pipe includes a continuous inner plastic sleeve and an outer seamless metallic pipe. The outer diameter of the plastic sleeve is circumferentially melt-bonded to the inner diameter of the outer pipe. The plastic sleeve constitutes an uninterrupted lining for the metallic pipe.

Abstract: A connector used for connecting the plastic metallic pipe includes a body, a cap, and three washers. The body has a section of thread in its outer wall for coupling with the cap which has a section thread in its inner wall. In operation, first insert the pipe into the cap, then insert the rubber washer, the metallic washer, and spring washer into the body, and then screw the cap into the body, such that the pipe is locked with the body.

Abstract: A plastic-lined metallic pipe for conveying liquid or gas includes a continuous inner plastic sleeve and an outer seamless metallic pipe. The outer diameter of the plastic sleeve is circumferentially melt-bonded to the inner diameter of the outer pipe. The plastic sleeve constitutes an uninterrupted lining for the metallic pipe. Also disclosed is a connector used for connecting the plastic metallic pipe. The connector includes a body, a cap, and three washers. The body has a section of thread in its outer wall for coupling with the cap which has a section thread in its inner wall. In operation, first insert the pipe into the cap, then insert the rubber washer, the metallic washer, and spring washer into the body, and then screw the cap into the body, such that the pipe is locked with the body.