BTAC888

Thanks for your expert feedback. I found out more information about the san dune soil composition. It contains 95% find sand (0.05-2.0 mm), 4% clay (<0.002 mm), and 1% silt (0.002-0.05 mm). The porosity varies from 33 to 48%.

The coating has very good abrasion resistance, but not to UV. Do you have any cocrete information on the sand dune movement? Thanks. Your response shed light onto my questions on the air content in the sand dune. The sand dune has 5-30% porosity. Air is in the porosity. So at the 1 meter deep air is still there. Oxygen is there too. In short, air is there at 1 meter depth of the sand dune. However, in Houston, the soil is composed of sand, clay, silt and water, there may be no air below 1 meter deep soil.

The field condition is as follows: 1. Location - sand dune in middle east 2. Depth of the pipeline buried under the sand = 1 meter below the surface 3. Water content in the send = < 1% 4. Pipeline operation temperatures= 110 - 120 C. 5. Air content around the pipeline will have impact on the thermo - oxidation of the external pipeline coatings. 6. I would like to know the air content (oxygen content).

The sandy soil in the sand dune is dry and porous. I would like to know the air content 1 meter (3.3 ft) below the surface. How much the air is there?