Definition - What does Midi-Rig mean?
A midi-rig is a Horizontal Directional Drilling (HDD) rig used to bore a hole and lay pipes underground without digging open trenches. Midi-rigs are suitable for medium-sized projects with lengths of up to 1000-feet, depth of up to 75-feet and pipes of up to 24-inches in diameter. Using the right size rig for a trenchless project ensures that costs are optimized.
Trenchlesspedia explains Midi-Rig
Trenchless projects involving HDD techniques vary widely in terms of distance of pipe to be installed, size of pipe and ground conditions. Mini, midi and maxi rigs are designed for these differing project parameters with an increasing power, torque and sophistication in the engineering as the rig increases in size. Midi-rigs are generally surface launched, and can be mounted on caterpillar tracks.
It is also possible to use a midi-rig as a guided bore for a larger drilling machine. It is important to note that even though small and medium size projects may require smaller rigs and simpler configurations, the principles of the physical stresses on pipes and drilling equipment remains the same.