FIELD: machine building.
SUBSTANCE: screw joint elements are subjected to local elastic and elastoplastic deformations. Elastoplastic sealing element is composed of metal ring gasket (4) to be arranged between the ends of casing pipes (1, 2). Gasket is pre-cooled in refrigerator, for example, in liquid nitrogen and, then, fitted in its proper place. Pipes (1, 2) are quickly screwed off to prevent fast heating of gasket (4). Note here that said gasket (4) gets in constricted position in lengthwise axis of casing. Note here that at heating said gasket expands to fill the gap between the surfaces of its location but stays contracted like a spring since the gap between surfaces being sealed inhibit its complete expansion.
EFFECT: tightness of casing thread joints at whatever loads, longer life.
4 dwg
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