20 HP 12 Bar High Pressure Reciprocating Air Compressor

The SJ PT 15T 20 is a two-stage reciprocating piston air compressor engineered for industrial applications requiring reliable medium airflow with higher pressure output. This model is specifically designed for workshops, manufacturing units, and service industries where compressed air demand is intermittent but pressure requirements are critical.

Built with a two-stage compression mechanism, this compressor ensures efficient air delivery, reduced heat generation, and improved durability compared to single-stage piston compressors. It is a cost-effective and practical solution for operations that do not require continuous-duty screw compressors but demand robust performance under variable load conditions.

The SJ PT 15T 20 operates on a two-stage reciprocating compression cycle:

• In the first stage, atmospheric air is drawn into a low-pressure cylinder and partially compressed

• The compressed air is then transferred to a high-pressure cylinder for final compression up to the required pressure level

This staged compression process results in:

• Higher volumetric efficiency

• Reduced discharge temperature

• Improved mechanical life

• Better performance at higher pressure (up to 12 bar)

This design is essential for applications where single-stage compressors are insufficient due to pressure limitations.

• Model: SJ PT 15T 20

• Type: Two Stage Reciprocating Piston Air Compressor

• Power: 20 HP / 15 kW

• Free Air Delivery:

  • 60.66 CFM at 7 Bar

  • 59.8 CFM at 12 Bar

• Air Receiver: 300 / 500 Liters

• Cooling System: Air Cooled

• Duty Cycle: Intermittent / Semi-Continuous Operation

Used for operating:

• Pneumatic impact wrenches

• Tyre inflators

• Grease pumps

• Car washing systems

Why this compressor is used:
Automobile workshops require moderate airflow with frequent start-stop usage. The piston compressor provides sufficient pressure while remaining cost-effective for non-continuous operations.

Used with:

• Spray guns

• Paint booths

• Powder coating systems

Why:
Painting applications require stable pressure rather than continuous airflow. Two-stage compressors provide consistent pressure output, which directly impacts finish quality and coating uniformity.

Used for:

• Pneumatic drills

• Angle grinders

• Cutting tools

• Assembly air tools

Industries include:

• Metal fabrication

• Small engineering units

• Maintenance workshops

Why:
These operations involve multiple tools used intermittently. A screw compressor would remain underutilized, making piston compressors more economically viable.

Used with:

• Nail guns

• Staplers

• Sanding tools

• Spray finishing equipment

Why:
Woodworking applications have fluctuating air demand. Piston compressors handle these load variations efficiently without the high capital cost of screw systems.

Used in:

• Filling machines

• Sealing machines

• Labeling systems

Why:
These machines require controlled pneumatic actuation rather than continuous airflow, making reciprocating compressors suitable.

Used for:

• Spraying systems

• Small agro-processing units

Why:
These sectors require rugged, easy-to-maintain equipment with low operating complexity and minimal infrastructure dependency.

Used for:

• Air blowing and cleaning

• Maintenance tools

• Workshop utilities

Compared to single-stage piston compressors:

• Higher pressure capability (up to 12 bar)

• Better efficiency at higher compression ratios

• Lower heat generation

• Longer service life

Compared to screw compressors:

• Lower initial investment

• Suitable for intermittent usage

• Easier maintenance and repair

• No requirement for continuous operation

This model is best suited for:

• Intermittent and semi-continuous operations

• Medium air consumption with higher pressure requirement

• Workshops and decentralized compressed air systems

This model is not suitable for:

• Continuous 24/7 industrial operation

• Large centralized air systems

• High-volume production plants requiring constant airflow

For optimal performance, the following configuration is recommended:

• Air receiver (300 or 500 liters as per usage)

• Moisture separator or basic air filtration

• Proper piping layout to reduce pressure drop

For sensitive applications such as painting:

• Add air filters and dryer to improve air quality

• Requires periodic maintenance such as piston rings, valves, and lubrication

• Generates higher noise compared to screw compressors

• Efficiency reduces under continuous full-load operation

The SJ PT 15T 20 is positioned as:

• A practical solution for small to medium industries

• A cost-effective alternative to screw compressors for intermittent use

• A reliable high-pressure compressor for workshop and service applications