The boiler plug of the instant invention seals the tube at the point of the leak by combining two techniques:
1. Inserting a copper sleeve of a slightly smaller diameter than the faulty tube into the faulty tube, and two (2) tapered, cast-iron plugs of a slightly smaller diameter than the sleeve until the sleeve is directly over the corroded area of the tube;
2. Threading a bolt through the center of both plugs and then tightening the plugs together. By this technique, the rod brings the cast-iron plugs together within the copper sleeve and compresses the copper sleeve against the inner surface of the tube thus sealing the leak. This eliminates the need to drain and cool the boiler before the tube can be patched from both ends or replaced.
The major parts of the boiler plug of the instant invention are as follows: A tool smaller than the diameter of the tube the length of which can be adjusted depending on the length of the tube. A sleeve made of an outer layer of rubber and an inner layer of copper having a maximum circumference marginally smaller than the circumference of the tube. Two (2) tapered plugs made of cast-iron with a slightly smaller diameter than the sleeve which are threaded onto a threaded steel bolt which has a cap on one end the same diameter of the sleeve. The rod is longer than the length of the plug-sleeve assembly allowing the tool to be threaded onto it
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