The line stopping process can be made to any main pipe material using the most compatible fittings and components found on the market. To us, it does not matter if it is a small leak repair or a large-scale pipeline relocation we will ensure a flexible and customer-oriented service.
Line stopping (also known as line plugging) is a safe and efficient solution for temporarily isolating a section of a piping system without shutting down the entire network. This allows all modifications and repairs to be carried out in the isolated section while the rest of the pipeline remains fully operational. Line stopping acts as a temporary shut-off valve when no existing valves are nearby or when existing valves are not functional.
The process begins by installing line stop fittings on the pipeline — either by welding or, if welding is not possible or permitted, by using a mechanical clamp fitting. Once the fitting is secured, Tonisco Service inserts a temporary line stop valve and performs a hot tap to access the main pipe. After the hot tapping is complete, a mechanical plugging head is inserted into the pipeline. The stopper head is then tightened to safely restrict flow in the targeted section.
Tonisco Service primarily uses high-tolerance mechanical plugs, which provide a reliable and flexible solution for both new and aging pipelines, regardless of their current condition.
For district heating and cooling networks, there are two primary line stopping methods: Single Stop and Double Stop solutions.
In the Single Stop method, the pipeline is temporarily plugged from one point. Once the plugging is completed, the line is safely drained, and repair or modification work is carried out on the emptied and secured section. In this setup, the line stop functions as a temporary shut-off valve.
The Double Stop method involves plugging the line from two points. The section between these two plugs is then drained, while the rest of the network remains fully operational. A temporary bypass line is installed between the line stop machines to maintain continuous service during the work.
Leak repairs with minimal or no service interruptions
Valve replacements or new valve insertions under pressure
Pipeline relocations without service loss or shutdowns
Adding new pipeline components or structures to existing systems
If you want to learn more about how to perform repair and modification work without shutting down your network, please contact our service team at service@tonisco.com.
No service interruptions — the pipeline remains fully operational
No treated water loss during the process
No need to wait for the line to be completely emptied, significantly reducing filling times
Avoids costly pipeline redesigns and lowers planning expenses
Eliminates the need to notify customers of heating or cooling shortages
Facilitates cooperation through shared work stages, including welding
Turnkey planning and execution available upon request
Maximum operational pressure: 25 bar at 40°C
Maximum operational temperature: 130°C at 16 bar
Line stop size range: DN20 (3/4″) to DN1600 (64″)
Compliant with both ASME and DIN standards
Maximum operational pressure: 700 PSI at 40ºC
Maximum operational temperature: 270ºC at 350 PSI
Line stop size range: DN25 (1″) to DN1600 (64″)
Compliant with both ASME and DIN standards