- Inflatable Duct Sealing system
- Inflatable Duct Sealing system
- External valve
- OEM&ODM service
RDSS Rayflate Inflatable Duct Sealing System External valve type is used to block the unsealed cable pipes and ducts in case of dampness and flooding in substation basements, cable vaults and access manholes and protecting the pipes and ducts from rust, corrosion and humid environment damages.
RDSS Rayflate Inflatable Duct Sealing System External valve type designed for use on power cables to provide a watertight seal when used with plastic, concrete or steel ducting systems.
Once installed the RDSS Rayflate Inflatable Duct Sealing System External valve type provide operators with immediate access in clean and dry conditions, eliminating the routine of pumping manholes dry before work can begin.
Clean, fast, easy sealing method
The RDSS Rayflate Inflatable Duct Sealing System External valve type consist of an inflatable bladder of flexible metallic laminate, coated on both sides with a sealant strip. With the sealant strips lubricated, the product is simply wrapped around the cable and easily slides into the duct. The bladder is then inflated with a gas pressure tool which presses the sealant coating against the duct wall and the cable. Upon removal of the filling tube, an automatic gel valve system reliably retains the gas pressure in the Rayflate duct seal. The entire installation is performed within a few minutes – even in congested enclosures – without any messy or installer-sensitive mixing and filling.
Seals vacant and multiple cable ducts
Depending on the duct diameter, most RDSS Rayflate Inflatable Duct Sealing System External valve type bags seal vacant ducts and ducts which contain up to two cables. Sealing of three or more cables can be easily achieved by merely inserting a mastic sealant-clip between the cables.
As the RDSS Rayflate Inflatable Duct Sealing System External valve type adapts itself to most configurations, the system is independent of duct ovality. Each RDSS Rayflate Inflatable Duct Sealing System seal covers a large range of cable and duct diameters.
Ideal for both new and existing cable installations
The versatility of the wraparound concept enables use not only for new cable installations, but also for existing applications. Unlike other
methods that require dry ducts, the Rayflate seals can be installed when water is still flowing out of the duct thus saving valuable installation time.
RDSS Rayflate Inflatable Duct Sealing System External valve type are easier to be removed from a duct or a pipe than other systems. This allows cables to be replaced in an upgrade or repair. Since ducts are not damaged by the RDSS Rayflate Inflatable Duct Sealing System airtube, they can easily be sealed again.
RDSS Rayflate Inflatable Duct Sealing System External valve type are a result of our long involvement in sealing and corrosion protection technologies.
Extensive testing at room temperature has shown water and air tightness at static pressures of more than 0.3 bar, even in conjunction with cable bending, vibration, torsion and axial pull. Resistance to common chemicals has been proven by immersion tests.
As the RDSS Rayflate Inflatable Duct Sealing System External valve type is specially designed for power cables, it was tested with cables load-cycled at conductor temperatures of 90°C, similar to specifications required for cable accessories. The sealing tests showed water and air tightness with internal duct pressures of 0.3 bar with single and multi-cable configurations. A detailed test report is available.
Lifetime calculations indicate that a typical RDSS Rayflate Inflatable Duct Sealing System airtube will withstand a 3 m waterhead for 30 years after installation. These results are based on typical utility cable loads at average ambient temperatures of 25°C and diffusion rate measurements at elevated temperatures and after ageing by load-cycling. The sealing performance was confirmed by sealing tests with reduced internal bladder pressures