412F Air flush Core Barrel for soft to medium hard rocks
412F Air flush Core Barrel for soft to medium hard rocks
The 412F Air flush Core Barrel advantage is it can be optimized for the use of air flush
Technical Data
Specification | Core Barrel Type |
412F | |
Hole Diameter (mm) | 107.2 |
Core Diameter (mm) | 74.7 |
Kerf / Crown Thickness (mm) | 16.25 |
Cutting Area (cm2) | 46.5 |
Hole Area (cm2) | 90.3 |
Cutting Area as % of Hole Area | 51.40% |
Core Area (cm2) | 43.8 |
Thread Connection in Head* | HW |
Recommended Casing | PW |
Conversion to triple tube possible | Yes |
Cross-over sub required for drill rods not matching the thread connection in core barrel head
Key to Main Parts of 412F Core Barrel Assembly
Complete core barrel consists of:
1. Core Barrel Head
2. Inner Tube 1.5m or 3.0m
3. Outer Tube 1.5m or 3.0m
4. Inner Tube Extension
5. Core Lifter
6. Core Lifter Case
Core Bit is not supplied as part of the core barrel assembly, but must be chosen correctly to match the particular application and rock formation.
Applications and functions:
412F Air flush Core Barrel is often used for open-cast coal exploration and general geotechnical coring in situations where it is not desirable to use air as the flushing medium. It is designed for coring in soft to medium hard rocks using air as the flushing medium.
What is essential for cooling the bit and uplifting rock cuttings from the borehole? The large annular space between the inner and outer tubes, in combination with face-discharge core bit designs, allows a large volume of air to reach the face of the bit.
This core barrel has proved to be very effective when used with PCD core bits, giving a fast rate of penetration and good core recovery
