High-Pressure DTH Bits

Designed for High-Energy Drilling Environments
High-pressure drilling environments place unique demands on DTH drill bits. Elevated air pressure increases piston energy and impact frequency, which can significantly accelerate wear if the bit structure and materials are not properly engineered. High-Pressure DTH Bits from TANK DRILLING are developed specifically to operate under these conditions, ensuring that increased energy translates into faster penetration rather than premature failure.
The bit body is forged from premium alloy steel and subjected to controlled heat treatment to achieve an optimal balance between hardness and toughness. This allows the drill bit to absorb repeated high-energy impacts without cracking or deformation, even during extended drilling cycles in abrasive rock formations.

Tungsten Carbide Button Technology
At the cutting face, high-grade tungsten carbide buttons are strategically arranged to distribute impact loads evenly across the bit surface. Button shape, size, and protrusion height are selected based on formation hardness and drilling pressure. In high-pressure applications, spherical and reinforced gauge buttons are commonly used to resist chipping and flattening, extending overall bit life.
As drilling progresses, the buttons maintain effective rock contact, allowing the bit to fracture rock through a combination of impact crushing and controlled shearing. This helps maintain stable penetration rates while reducing vibration and uneven wear.

Optimized Face Design and Flushing
Efficient cuttings removal is critical in high-pressure drilling. Poor flushing can cause regrinding, excessive heat, and accelerated wear of both the bit and hammer. High-Pressure DTH Bits are designed with deep face grooves and optimized flushing holes that direct airflow across the cutting face and out of the borehole.
This flushing design helps keep the hole clean, stabilizes drilling parameters, and protects the bit body from excessive abrasion. In deep or large-diameter holes, effective flushing also contributes to straighter holes and more predictable drilling results.

High-Pressure DTH Bits are widely used in applications where productivity and reliability are critical:

• Open-pit mining blast holes, where deep and straight holes are required for consistent blasting results.
• Hard-rock quarrying, especially in granite, basalt, and dense limestone formations.
• Large-diameter foundation drilling, such as bridge piles, wind power foundations, and infrastructure projects.

In a South American open-pit copper mine, High-Pressure DTH Bits were used with a 25–30 bar compressor for 165–203 mm blast holes. Compared with conventional bits, average bit life increased by approximately 25–35%, while penetration rates improved by 15–20%, resulting in fewer bit changes and reduced drilling downtime per shift.

Each High-Pressure DTH Bit undergoes a controlled manufacturing process that includes forging, CNC machining, heat treatment, and final assembly. Button holes are precision-machined to ensure tight interference fits, reducing the risk of button loss under high impact loads.
Before shipment, every batch is inspected for dimensional accuracy, hardness consistency, and surface integrity. Selected samples are subjected to impact and wear simulation tests to verify performance under high-pressure drilling conditions.

Quality control is integrated throughout the production cycle. Incoming raw materials are verified for chemical composition and mechanical properties. During production, critical dimensions and tolerances are monitored. Finished bits are inspected for button seating, shank accuracy, and overall structural integrity.
This multi-stage QC process helps ensure consistent performance across production batches and minimizes variability in field applications.

Compared with standard or low-pressure DTH bits, High-Pressure DTH Bits offer:

• Higher resistance to impact fatigue
• Improved wear resistance in abrasive formations
• Better performance in deep and large-diameter holes

While initial cost may be slightly higher, the extended service life and improved drilling efficiency typically result in a lower cost per drilled meter.

TANK DRILLING provides technical support for bit selection based on formation data, hole diameter, and hammer type. Custom button layouts and shank configurations are available to match specific project requirements. With stable production capacity and export experience, we ensure reliable delivery schedules and responsive after-sales support.