FIELD: power machine engineering, chemical industry branches, namely apparatuses for creating favorable compression stresses in zones of welded seams of pipeline in order to prevent corrosion cracking under stress during exploitation. SUBSTANCE: apparatus uses effect of water density change at its conversion from liquid to solid state. Apparatus is in the form of detachable sleeve, it includes cooling system and working chamber in the form of annular cavity surrounding pipeline. Squeezing is realized by action of static pressure of water filling working chamber at cooling of apparatus. EFFECT: simplified design, lowered energy consumption. 5 cl, 3 dwg
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