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Monoblok Insulating Joint

Monoblok Insulating Joint

After an intensive 2-year R&D process, GGN has started the production of one-piece insulating expansion joints. This innovative product can be manufactured to fit all types of alloy pipes, particularly carbon steel, up to 40″ 600 lb.

Where is the isolation flange used?

The isolation flange is mounted a few centimeters above the point where the underground steel pipeline reaches the surface of the ground. This flange is used to isolate the underground pipeline from the overhead natural gas pipeline. Its main purpose is to extend the life of the magnesium anode used for cathodic protection.

The magnesium (Mg) anode delays pipe corrosion. While natural gas pipe is prone to oxidation when made of iron (Fe), the magnesium anode prevents this oxidation by combining with the oxygen around the pipe. In underground pipelines, typically at depths of 1 to 2 meters, the use of a 2 lb. magnesium anode will help protect the installation for up to 20 years.

In addition, the insulating flange provides insulation against potential electrical currents and increases pipeline safety. This product is generally widely used in gas pipelines.