What Does Heavy HDD Rig Mean?
Heavy HDD rigs are defined as horizontal directional drilling units that weigh more than 82 tons. They are larger and heavier than light HDD rigs and are used for relatively longer crossings, up to a maximum distance of 3,000 m (9,843’). These rigs are used on projects where hole diameters may reach up to 1,524 mm (60”) in diameter.
Trenchlesspedia Explains Heavy HDD Rig
HDD rigs are used to install underground pipes, conduits and cables using a guided, surface-based rig to launch a drill to create a subsurface pathway. These HDD rigs usually fall into two categories: light rigs and heavy rigs. Although these two types of rigs perform essentially the same function, they each have benefits that lend themselves to different situations.
Heavy HDD rig units are more robust than their lighter counterparts and are designed specifically for drill crossings of a longer length, with larger diameter holes. However, because heavy HDD rigs occupy a larger footprint, they may not be suitable for areas where space is limited.