Lovett bored on one side of the field and then pulled the pipe back underneath the field from the other end. The soil was mostly clay with some boulders, and the project took us about four months to complete. For the geothermal application, the pipe was installed significantly deeper underground. Some coils were installed 30 ft deep, while others were 15 ft below the surface. To install the pipe using HDD, Lovett bored a hole in the ground, attached the pipe and pulled it back through to the other side.
They had 35 to 40 ft of extra pipe available in order to know how far to pull back. GeoTility and Lovett ran into one challenge while installing some of the coils, mainly due to where the drill was set up to bore under the field. Because of the location of the drill in relation to the site, the coils could not be grabbed from the u-bend to pull underneath the field. However, GeoTility was able to uncoil the pipe and attach the drill to the loose ends of pipe to pull through to the other side.
The contractors were able to install six coils per day using HDD, which is comparatively fast for this type of installation and application.
The base for the vault was made of sand. Once the vault was inside the excavated site, the headers for the project, which were prefabricated by GeoTility, were dropped in and fused to the header pipe. Next, the pipe coils were tied into the vault. Once that was complete, GeoTility tested all the individual circuits, with a total of eighteen 3-in. Overall, it has been a great experience. We look forward to more projects together. And with HDD, large tracts of land were undisturbed and the geothermal system installation was both speedy and successful.
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