Hot tapping, or under-pressure drilling, is a method of making a connection to existing pipelines or tank whilst the existing system is under pressure or still in use. This method employs a drilling or tapping machine, a full ported valve and a pressure-containing fitting to the existing pressurised containing fitting to the existing pressured system. The end result is a new branch connection abstracted from the orignal pipe while the line is still in operation.
The overall process is completed without any leakage or interruption to the flow of liquid. It is possible to perform a hot tap on pipes from 1″ to 48″ with pressure ratings of up to 100 bar and temperatures up to 500 degrees.
The types of pipes that this method can be applied to is almost unlimited:
- Cast iron
- Ductile iron
- Non ferrous metal
- Mild steel
- Stainless Steel
- Reinforced concrete