| 摘要 |
For the purpose of providing a sealing stopper in a tube (11) which is to be closed-of to the flow of fluid therethrough there is used a bladder (10) which is introduced into the tube and inflated with air into tight abutment with the inner surface of the tube. The bladder has a sealing ring (40) made of liquid absorbent material arranged on the outer periphery thereof. The ring is saturated with water prior to introducing the bladder into the tube. Subsequent to inflating the bladder into tight abutment with the tube wall, the bladder is filled with a cold glycol mixture, which displaces the air from the bladder. The glycol mixture has a temperature of -20 DEG C and the water in the sealing ring will therefore freeze to ice and freeze solid to the inner surface of the tube and to the bladder. |
