The main safety feature of the flange weld tester is that a central by-pass port allows the operator to monitor the downstream conditions. Specially designed polyurethane seals allow greater radial clearance where the weld bead is excessive, a feature that also allows the unit to seal in pipes suffering from pitting. Standard test pressures of up to 230 barg can easily be achieved and equipment that can test at higher pressures is also available, as well as hydraulically operated versions of these testers for the testing of larger diameter pipes.
High-pressure pipe plugs
High-pressure pipe plugs can be used when a weld or joint needs to be hydrostatically tested on an open pipe or vessel. As the need to weld caps or flanges to the pipe is eliminated, considerable time and cost savings can be made.
The tester can be mechanically locked onto the internal bore of the pipe whilst simultaneously compressing the polyurethane seal with the addition of metallic gripper pads. The pipe can now be filled with water through a centre by-pass port on the plug, and when used in pairs, the by-pass port on the second plug will allow the venting of air from the pipe.
An added safety feature with this design is that it is self-energising. Hydraulically operated versions are also available.