Low pressure, medium pressure or high pressure DTH hammers?

Air pressure is the power source for DTH hammers during operation, directly determining their efficiency and drilling speed. Based on the working air pressure, DTH hammers can be categorized into low pressure, medium pressure, and high pressure types. This classification is primarily based on the air pressure level used by DTH hammers, with different pressure levels suited for various working environments and drilling needs.

1. Low Pressure DTH Hammers 

The working air pressure range for low pressure DTH hammers is usually below 7 Bar. Common model is CIR series, including CIR 65, CIR 70, CIR 80, CIR 110, CIR 150, and CIR 170.

Low pressure DTH hammers use compressed air as their power source, utilizing the impact force of the air to break underground rocks. These hammers have lower requirements for air compressors, and contain fewer internal components. Due to their lower working pressure, the impact force produced is also lower, which results in slower drilling speeds, thus allowing for more precise drilling.

The energy consumption of low pressure DTH hammers is relatively low, in situations where drilling speed is not highly demanding or where the rock formations are softer, low pressure DTH hammers are often competent and offer better cost-effectiveness.

Low-pressure DTH hammers are widely used in soil exploration, water well drilling, and small-scale construction projects.

2. Medium Pressure DTH Hammers

The working air pressure range for medium pressure DTH hammers is approximately 7 bar to 14 bar. Common models are BR2 and BR3. Compared to low-pressure DTH hammers, medium pressure hammers offer better drilling efficiency and speed, allowing for deep hole drilling generally used in larger-scale construction projects.

3. High Pressure DTH Hammers

The working air pressure range for high pressure DTH hammers is approximately above 14 bar, with the maximum pressure reaching around 35 bar.

With advancements in air compressor technology, the working air pressures of high pressure DTH hammers have been increasing, and even some small diameter DTH hammers can be used as high pressure hammers now.

Common high pressure DTH hammer models include:

DHD series: DHD3.5, DHD340, DHD350, DHD360, DHD380;

QL series: QL40, QL50, QL60, QL80; SD series: SD4, SD5, SD6, SD8; Mission series: Mission 30, Mission 40, Mission 50, Mission 60, Mission 80;

COP series: COP32, COP34, COP42, COP44, COP64, COP84.

High pressure DTH hammers use high pressure gases as a power source, with the gas explosion reaction producing high-speed impact forces to break the rocks. These hammers generally require larger air compressors to provide sufficient working pressure, and their design also emphasizes impact force and wear resistance.

Due to their high working pressure, they can generate a greater impact force, effectively breaking hard rocks, which enhances drilling efficiency in tough rock conditions.

High-pressure DTH hammers are widely used in mining, hydraulic engineering, road construction, and geological exploration.

In practical DTH drilling applications, it is necessary to consider factors such as specific project requirements, rock characteristics, environmental conditions, and budget constraints comprehensively.

Choosing the most suitable DTH hammers is the key to ensure the smooth progress of the drilling process, improve drilling efficiency and reduce operating costs.