89mm Symmetrix Overburden Casing System for Concentric Drilling

CRITICAL ADVANTAGE & PURCHASING TIPS:

• Zero Borehole Caving: This system drills and drives the 89mm casing simultaneously, providing 100% instant wall protection in loose gravel, sand, and fractured rock layers.

• Loss-in-Hole Supply: The Ring Bit stays permanently at the bottom of the hole as a necessary consumable. To avoid site downtime, Bloom technically recommends stocking 20-30 Ring Bits for every 1 Reusable Pilot Bit.

When drilling through unpredictable overburden conditions, borehole caving is a constant threat. Bloom's 89mm Symmetrix casing system is engineered to drill and case your hole simultaneously, utilizing a full-face head design that maximizes top hammer impact energy for exceptional penetration and hole straightness.

The system operates via an advanced bayonet coupling mechanism: during drilling, the hammer's percussive energy is transferred through the pilot and ring bits to crush rock and advance the casing together. Built-in flushing grooves ensure a superior seal at the bottom, minimizing disruption to the surrounding geology. Upon reaching the desired bedrock depth, a slight reverse rotation effortlessly unlocks the pilot bit, allowing you to retrieve the drill string smoothly while the ring bit remains securely in place to stabilize the hole.

Whether you are building dam foundations or drilling deep geothermal wells, our technical team is ready to discuss your geological challenges and optimize your tooling configurations.