FIELD: heat engineering. SUBSTANCE: pipes of the heat exchanger of a steam generator, which are ended inside the tank of the collector, if they can not be used, are plugged with tubular diverging plugs 16 having expander 64 inside a contraction chamber, wall 61 of which is forcedly projected when the plug secured to a mandrel is moved away. The mandrel is held by a system that is received in the collector through the narrow neck on lengthened support when it is parallel to the axis of the collector. The lengthened support may also carry a tool for roller expansion of the end of the pipe before plugging. EFFECT: enhanced convenience of mounting. 17 cl, 11 dwg
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