General Description
The S125D rotary air compressor is a high-pressure stationary unit developed to meet increasing air supply demands in drilling and construction industries. With a pressure capacity of up to 30 bar, it provides reliable and continuous air flow for water well drilling, high-rise foundation works, geothermal development, mining operations, oil and gas extraction, and pipeline cleaning.
Designed for long-term operation, the S125D has been upgraded to enhance durability and reduce fuel consumption. Multiple pressure and temperature sensors are built into the system to monitor key parameters in real time. Working in coordination with the engine ECU and controller, the compressor optimizes fuel injection to achieve efficient performance. A dual working mode with one-click switching allows operators to adjust pressure levels according to different job requirements.
The unit is equipped with an imported controller, simplifying operation to three switches: power, start, and stop. Key processes such as preheating, loading, unloading before shutdown, pressure adjustment, and fuel injection are fully automated, reducing operational errors and ensuring stable performance. The controller is designed to be waterproof and moisture-resistant, making it suitable for harsh working environments.
With its strong air delivery capacity, intelligent control system, and steady performance, the S125D rotary air compressor offers a reliable air source solution for continuous and demanding industrial applications.

Technical Parameters
|
Name |
Unit |
S125D Rotary Air Compressor |
|
Nominal displacement |
m³/min |
36 |
|
Rated discharge pressure |
Bar |
30 |
|
Screw machine oil volume |
L |
120 |
|
Compressed series |
step |
2 |
|
Engine type |
Tin firewood |
QSZ13-C550-30 |
|
Engine output |
kw |
410 Cummins engine |
|
Fuel tank capacity |
L |
600 |
|
Dimensions |
mm |
4220*2000*2300 |
|
Total weight |
kg |
5820 |
|
Air evacuation valve |
Inch |
1-G2" 1-G1" |

Significant Advantages
1. Two-stage screw airend: Delivers high efficiency with lower energy consumption, reduced vibration, and low noise. Equipped with a lubrication pump and filter, ensuring reliable operation and extended service life.
2. Power system: Driven by a Cummins 550 HP construction-grade engine with an integral all-steel piston design. The engine block and crankshaft are made of high-strength materials, capable of withstanding ultra-high explosion pressures up to 230 bar. Strict component testing guarantees higher strength and long-term reliability.
3. Main controller: All diesel screw compressors are equipped with internationally recognized imported controllers. The interface is simplified to just three switches-power, start, and stop. Functions such as preheating, automatic loading, unloading before shutdown, pressure regulation, and fuel injection control are fully automated. This prevents operator errors that may cause high-pressure shutdowns or fuel misinjection. The controller is waterproof and moisture-resistant for reliable operation in demanding environments.
4. Air intake system: Uses a patented air filter assembly with a safety filter element, along with stainless-steel intake pipes. This design ensures effective dust filtration while preventing failures caused by aging or cracking of conventional rubber intake hoses.
5. Cooling and noise reduction: A newly designed air guide cover improves cooling efficiency while enhancing safety protection. Full-body sound-absorbing materials and a rear-mounted silencer reduce operating noise to 40% lower than conventional products.

Application
The S125D rotary air compressor delivers high-pressure, stable air for a wide range of industrial uses. It is suitable for water well drilling, providing continuous airflow for deep wells; foundation and construction projects, supporting high-rise building foundations and other geotechnical works; geothermal development, supplying air for drilling and extraction processes; mining operations, powering pneumatic equipment and rock drilling; oil and gas extraction, serving as a flushing medium in underbalanced drilling; and pipeline cleaning, delivering high-pressure air for debris removal and maintenance.

Packaging & Shipping
Delivery time: 10-15days
We use professional equipment to frame the boxes. We will arrange specially-assigned person to inspect every step. Ensure transportation safety.

Certificate
Our products have passed CE certification and ISO9001 quality management system certification, ensuring that they meet international standards in terms of safety, reliability and quality.

FAQ
Q: Why choose us?
A: Rancheng Machinery is a very professional drilling rig supplier in China. We have rich experience in this industry for 11 years. Now our products are serving around the world. We have high-quality drilling rigs, professional and efficient services, competitive prices and fast delivery.
Q: Do you offer any custom designs?
A: Yes, we have our trade factory. We provide our customers with customized service. We can produce a superior product for you by your designs.
Q: How to order?
A: Step 1, please tell us what model and quantity you need;
Step 2, then we will make a proforma invoice for you to confirm the order details;
Step 3, we confirmed everything, then arrange the payment;
Step 4, finally we deliver the goods within the stipulated time.
Q: When will make delivery?
A: About 10-15 work days after receipt of the payment.
Q: After-sales service
A: One-year warranty for all kinds of products;
Q: Can we visit your factory?
A: Yes, we warmly welcome you to visit our factory.
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