Alternative materials, grouts or gels for filling voids underneath gas sleeves on metallic pipes

Strength and protection are provided to inner gas pipes by a secondary outer sleeve, with an air gap or grout between.  A GDN is looking for a more efficient alternative to the standard techniques and materials, including ‘gels’ that can be used in this application, which is environmentally friendly, prevents deterioration to the carrier pipe, has minimal shrinkage properties and a pH in excess of 9 and a low electrical resistivity to satisfy the requirements of cathodic protection.


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