STOPPLE® Plugging System


For more than 60 years, the TDW STOPPLE® plugging machine has represented one of the safest and most reliable solutions for isolating pressurized sections of pipeline. The machine serves as a temporary block valve and allows operators to bypass through the housing so that repairs and maintenance activities can be performed without shutdown or interruption of service.

The STOPPLE plugging machine consists of three primary components: a hydraulic cylinder or jackscrew, a plugging head housing, and a plugging head. The procedure for isolating the line using the machine is as follows:

  1. STOPPLE Plus fittings with LOCK-O-RING® Plus flanges are welded on each end of the section to be isolated. Bypass and equalization fittings are also welded to the line.
  2. A tapping valve is mounted on each fitting, and taps are created through the valves into the pipeline. The cutter is withdrawn after each tap, valves are closed, and the tapping machine is removed.
  3. The bypass valves are opened, the STOPPLE plugging machine is mounted, and the plugging head is lowered through the valve into sealing position. Upon completion of the new section being tied in, pressure is equalized.
  4. Cutters are replaced with LOCK-O-RING plugs and the tapping machine is mounted on the valve. The plug is then lowered into position through LOCK-O-RING flanges, the tapping machine is removed, valves are recovered, and blind flanges are installed.

Key features:

  • Available in sizes 4 inches and larger.
  • Maximum operating temperature of 82°C (180°F).
  • Control valve is located on lower end of hydraulic cylinder for ease of use.


*Attention, product part numbers may have changed. Please contact your local TDW representative to verify.

Want more information? Click here to download the detailed product bulletin.*