Pneumatic plugs are used for plugging pipes, for leak testing or for pipe maintenance work. Made of high quality rubber. With air valve coupling for inflation.
Multidimensional pneumatic locking plugs are suitable for cutting and temporary inspection of all types of sewer lines, pipes and bores with circular cross-section from DN 33 to DN 2200.
Type of construction: The seals are made of high quality rubber and polyamide textile layers. This combination of materials allows for long term use in temperatures ranging from -25ºC to 70ºC. It can also be used in temperature ranges from -30ºC to 100ºC (for short periods).
Moreover, the rubber mixture is resistant to liquids with a pH range between 2 and 12. The material of these plugs also complies with existing drainage standards in terms of hygiene and water economy.
It is not possible to use this plug with aggressive materials over a long period of time and it may lead to the destruction of the plug. For inflation, the plugs are equipped with a coupling for a type 26 air valve.
Characteristics of the pneumatic shutter:
- Pneumatic plug diameter 150-300 mm.
- Minimum sealable diameter: 150 mm.
- Maximum sealing diameter: 300 mm.
- Working pressure: 2.5 bar.
Models and sizes:
Shutter uses and application:
To test the tightness of the pipes, we need to seal the piece of pipe to be tested. We will need a blind plugging balloon, placed at one end and another one, at the other end, with a bypass.
Before inflating a pneumatic packer, we must check the diameter of the pipe, so that we can select the range and maximum inflation pressure of the packer.
The packer placed in the bypass has a plug with two plugs, to which the hose is connected, to fill the pipe with air, one, and the other is connected to a hose with a manometer.
The filling hose is connected to a compressor and, once the filling process has started, we will check that the hose is filled with air and that it maintains or decreases the pressure we need to maintain. To have the pressure controlled, we must stabilize it. Once the pressure is stabilized, if it drops and is not maintained at the established values, we will understand that the pipe is not watertight.
Pressure and tightness tests are standardized both for water supply networks, pressurized water piping installations inside buildings, as well as for sewerage pipes.
Tightness test according to UNE-EN 1610 standard:
The tests defined in this standard can be performed with water, according to Method “W”, or with air, according to Method “L”.
Air Method “L” is the method recommended by the standard. If a valid test with air is not obtained, the test with water should be carried out, the result of which is decisive. The duration of the air test is indicated in the following table, and is determined by the pipe diameter, the pipe material, and the method considered (LA, LB, LC or LD).
Plugs must be placed in the manholes and in the branch of the service connection, thus ensuring a complete check of the section. The test starts with an initial pressure (p0) 10% higher than required, and is maintained for 5 minutes.
Next, the pressure must be adjusted to the test pressure, given in the table above, according to the selected test method.
If the pressure drop, after the test time has elapsed, is less than the ∆p given in the table, the test is considered as acceptable.