Duct leakage control

摘要: The invention relates to the control of leakage from ducts, such as fluid-carrying pipework, without necessarily requiring direct access site itself; since sites are often difficult locate with necessary degree precision permit reliably be made thereto, and moreover, even if a can located, it is not always convenient or economically possible secure thereto. provides an apparatus methods for duct wherein sealing element (1) introduced into automatically drawn otherwise guided locality leak; being caused, by reason pressure differential attributable leak, move stem seal leak. may comprise plurality individual members differing buoyancy, each capable carried along at predetermined level in flow fluid therein. carry tagging device which used assist locating site.