Common models and characteristics of drill pipe
Drill pipes are important tools in drilling. Common drill pipe models are mainly the following:
1. AW drill pipe: 44.5mm in diameter, suitable for drilling shallow rocks.
2. BW drill pipe: 54mm in diameter, suitable for drilling rocks at general depths.
3. NW drill pipe: 69.9mm in diameter, suitable for deeper rock drilling, good torsion resistance.
4. HW drill pipe: 88.9mm in diameter, suitable for deeper rock drilling, strong bearing capacity.
5. PW drill pipe: 114.3mm in diameter, suitable for deeper rock drilling, greater bearing capacity.

Application scenarios and precautions of different types of drill pipes in drilling
1. AW drill pipe is suitable for drilling shallow rocks. Due to its small size and relatively weak strength, it is necessary to avoid excessive bending, excessive impact and other operations during use to avoid damage.
2. BW drill pipe is suitable for rock drilling at a general depth. During use, it is necessary to avoid overload operation to avoid drill pipe breakage.
3. NW drill pipe is suitable for deeper rock drilling and has good torsion resistance, but due to its long length, it is easy to bend and fluctuate. Therefore, it is necessary to improve the operating skills during use to avoid excessive vibration.
4. HW drill pipe and PW drill pipe are suitable for deeper rock drilling and have greater bearing capacity, but at the same time they also require higher operating skills and stricter use conditions, such as avoiding overload operation and reducing the operating speed.

In short, when using any type of drill pipe, the operating specifications should be strictly followed, and the corresponding model and material should be selected according to the characteristics of the rock and the drilling depth to ensure the safety and efficiency of the drilling operation.