CP Series Low Air Pressure DTH Hammer – Versatile Medium-to-Large Hole Drilling for Hard Rock (Φ110–Φ175mm)

The CP Series Low Air Pressure Down-the-Hole (DTH) Hammer is a high-performance drilling solution designed for medium-to-large diameter boreholes in hard rock applications. Engineered for durability and operational efficiency, this series delivers powerful impact energy with moderate air consumption, making it the ideal choice for water well drilling, quarry blasting, and large-scale construction projects.

Featuring a robust spline-type bit connection and precision-engineered internal components, the CP Series ensures reliable power transmission and exceptional hole quality. The valved air distribution system provides consistent performance across a wide working pressure range of 7–13 Bar, perfectly matched with standard medium-pressure air compressors.

The CP Series is available in two models – CP110 and CP130 – offering hole diameter coverage from Φ110mm to Φ175mm. Both models share the same proven design philosophy: simple construction, easy maintenance, and long service life even in the most demanding drilling conditions.

All CP Series hammers are manufactured with high-grade materials and heat-treated wear parts to withstand abrasive rock formations. With interchangeable components and a modular layout, field servicing is straightforward, reducing costly downtime and maximizing productivity.

1. Water Well Drilling

Used extensively for medium-to-deep water well construction in hard rock formations. The CP Series delivers excellent penetration rates and outstanding hole straightness, ensuring reliable water yield and reduced drilling time. The Φ130–175mm hole range is particularly suited for production water wells requiring large casing installation.

2. Open-Pit Mining & Quarry Blasting

Widely applied in large-scale quarry operations and open-pit mines for production blasting. The CP130 model, with its Φ130–175mm hole capacity and powerful impact energy, delivers optimal fragmentation for efficient material loading and crushing. The CP110 serves as a versatile option for medium-sized blast holes.

3. Large-Diameter Foundation Engineering

Ideal for foundation piling, dam anchoring, and large-scale civil infrastructure projects. The spline-type bit connection ensures reliable torque transmission, making the CP Series suitable for applications requiring precise hole placement and verticality control.

4. Geothermal & Exploration Drilling

Employed in geothermal energy projects and mineral exploration programs where hard rock conditions and medium-to-large hole diameters are encountered. The CP Series provides consistent performance in variable geological formations, helping exploration teams achieve target depths with confidence.

5. Tunneling & Underground Construction

Used in tunnel pre-grouting, rock bolting, and underground support applications. The CP Series hammers offer the penetration power needed to handle hard rock conditions commonly encountered in tunneling and underground infrastructure projects.

1. Powerful Impact for Hard Rock Conditions

The CP Series is specifically engineered to deliver high single-impact energy for efficient drilling in hard and abrasive rock formations (f≥8). The optimized piston design and efficient air distribution system ensure maximum energy transfer to the bit, resulting in faster penetration rates and reduced drilling costs per meter.

2. Wide Hole Diameter Coverage

With the CP110 covering Φ110–140mm and the CP130 covering Φ130–175mm, this series addresses the most common medium-to-large diameter drilling requirements. This broad coverage allows drilling contractors to handle a variety of project specifications with just two hammer models, simplifying fleet management and spare parts inventory.

3. Superior Bit Compatibility

Both CP models feature spline-type bit connections with multiple shank compatibility options:

CP110: Compatible with KNSH-110 and CIR110 bit shanks

CP130: Compatible with CIR110 and CIR130 bit shanks

This flexibility ensures easy sourcing of consumables and allows operators to use existing bit inventories across multiple hammer models.

4. Robust & Durable Construction

All critical components – including the cylinder, piston, and guide sleeve – are manufactured from high-grade alloy steel and subjected to advanced heat treatment processes. This ensures exceptional wear resistance and extended service life, even when drilling in highly abrasive rock formations.

5. Simple Maintenance & Parts Availability

The CP Series features a modular design with easily accessible internal components. The straightforward valved system reduces failure points, and the parts list is kept simple across both models – with shared components including O-rings, check valves, springs, and valve seats. This commonality significantly reduces spare parts holding costs and simplifies field repairs.

6. Optimized Air Consumption

Engineered to deliver maximum impact power with moderate air consumption (7–13 m³/min), the CP Series allows operators to use mid-range compressor fleets efficiently. This balance between performance and air demand translates to lower fuel costs and reduced operational expenses.

7. Versatile Operating Pressure Range

Operating effectively across a 7–13 Bar working pressure range, the CP Series offers flexibility in compressor matching. This wide pressure tolerance ensures consistent performance even when compressor output fluctuates, providing reliable drilling in varying site conditions.

Q1: What rock conditions are the CP Series hammers suitable for?

The CP Series is specifically designed for hard rock formations (f≥8). Both models deliver the impact energy required to achieve high penetration rates in abrasive and competent rock types commonly encountered in mining, quarrying, and water well drilling.

Q2: What is the hole diameter range for each model?

CP110 covers Φ110–140mm, while CP130 covers Φ130–175mm. The overlap at Φ130–140mm allows operators to choose either model depending on weight, air consumption, and rig compatibility considerations.

Q3: What working pressure is required?

Both CP110 and CP130 operate at 7–13 Bar. For best performance, we recommend operating at the higher end of this range (12–13 Bar) to achieve maximum penetration rates.

Q4: What is the difference between the two overall length options for CP110 (723mm vs 737mm)?

The length variation corresponds to different front sub configurations, allowing compatibility with different bit shank types (KNSH-110 vs CIR110). Please confirm your bit shank type when ordering.

Q5: What bit shanks are compatible with CP Series hammers?

CP110 accepts KNSH-110 and CIR110 shanks. CP130 accepts CIR110 and CIR130 shanks. This compatibility ensures flexible bit sourcing options.

Q6: How do I choose between CP110 and CP130?

Follow this principle: First determine required hole diameter → Then select the hammer. Choose CP110 for Φ110–140mm holes; choose CP130 for Φ130–175mm holes. For hole diameters in the overlap range (Φ130–140mm), consider rig capacity, compressor output, and weight limitations.

Q7: What air compressor is recommended for CP Series hammers?

CP110 requires at least 12 m³/min at 7–13 Bar. CP130 requires at least 13 m³/min at 7–13 Bar. Always ensure the compressor can deliver the required pressure and volume simultaneously.

Q8: Are CP Series parts interchangeable with other brands?

CP Series hammers are designed with industry-standard configurations. The CP110 front sub is compatible with CIR110 bits, and the CP130 accepts CIR110/CIR130 shanks. However, we recommend using genuine CP Series parts for optimal performance and longevity.

Q9: Can the CP Series be used for underground drilling?

Yes. The CP Series is suitable for underground tunneling, rock bolting, and other underground support applications where hard rock conditions and medium-to-large hole diameters are encountered.

Q10: How often should maintenance be performed?

Routine inspection should be conducted after every shift. Full disassembly and component inspection are recommended every 500–800 drilling hours, depending on rock abrasiveness and operating conditions. Regular lubrication is essential for maximizing service life.