Definition - What does High-Pressure Plug mean?
A high pressure plug is used in trenchless construction to block or help divert high pressure flow from a pipe. The plug helps to keep the pipe dry as repairs are carried out or when a new pipe liner is installed. High pressure plugs make use of high strength, lightweight materials capable of being inflated and holding pressures at a high level.
Trenchlesspedia explains High-Pressure Plug
Once positioned, high pressure plugs are filled with either fluid or an inert gas in order to sufficiently block the flow of material or product in a high pressure pipeline. Because of the pressure involved, high pressure plugs are sometimes fitted with jaws that are able to grab onto the walls of the pipe to prevent slippage. High pressure plugs may also be fitted with test fittings when performing vacuum or pressure tests to find leaks.