FIELD: civil engineering. SUBSTANCE: two devices moved by flow of pumped over product are introduced into pipeline. Devices are provided with sealing, braking and stopping systems. Control systems are positioned at preset points above pipeline. With devices approaching place of repair, motion speed is reduced by means of braking system and by opening of flow by-pass system. Control system gives commands for braking, flow by-pass, device stopping, pipeline sealing, and product pumping-out. EFFECT: enlarged store of process facilities. 3 dwg
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