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Iris-Stop is a method of carrying out flowstopping operation to facilitate maintenance or repair to distribution networks, whilst maintaining continuity of supply.
Developed by British Gas, Iris-Stop has been fully tested and in constant use since it introduction in 1972 and has proved itself in use to be safe, quick and economic.
The System is based on the combination of structured barriers associated with high-pressure pipeline working and small hole principle associated with low-pressure bagging-off operations. The “Iris” is a mechanically operated shutter, which is inserted through a small hole in the main and opened, providing the structural barrier across the pipe cross section. The seal is created by inserting a bag through a similar small hole, positioned on the pressure side on the Iris. Once the operation has been completed, the equipment is removed and the small holes in the pipe plugged.
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