Tee fitting of FT type are steel fittings designed for realization of branches (connections) through drilling in steel pipeline with internal overpressure with no leakage of medium. After a T-piece is welded on the pipeline and connected with the branch pipe, the pipeline is drilled in and then the T-piece is closed with a stopper with no leakage of media. There is an outside thread in the upper part of the T-piece designed for connection of a drilling set and there is an inside thread for a closing stopper. The lower part of the body is pre-processed for easier adjustment of welding surface before welding. As a standard, T-pieces are supplied with a bevel for V-shaped weld located at the end of a branch outlet, or with an adapter steel/PE for connection of the branch pipes. Standard delivery also includes a closing stopper with an external or internal square end and a sealing O-ring. The stopper and the upper part of the T-piece body have been adjusted for possible circumferential sealing weld. Secondary sealing may also be made through installation of covering lid FV (following 5.1-4 hereof).
APPLICATION RANGE AND SPECIFICATIONS
Diameter of the branch pipe:
- steel pipe DN/ID 25 up to 100 mm (1“up to 4“)
- PE pipe DN/OD 32 up to 110 mm
Maximum diameter of the drilled hole:
38 up to 89 mm
Outside diameter of pipeline to be welded:
48.3 mm and more
Media:
Natural gas, non-aggressive gas, other media should be consulted
Maximum pressure of medium:
- branch steel pipe – up to 16 bar
- branch PE pipe - up to 4 bar
Material of the fitting:
Steel part: steel properties in accordance with ČSN
EN 1028-1 and ČSN EN 10208-2
Sealing components: EPDM rubber with properties
in accordance with ČSN EN 549