API 618 Compressors

API 618 compressors are piston compressors designed to meet the American Petroleum Institute (API) standard. They were specifically designed for the oil, gas, and process industries. Their main features are their high reliability, easy maintenance, and ability to handle tough operating conditions.

API 618 compressors work on the positive displacement principle, where pistons are used to compress gas. One or more pistons reciprocate within cylinders, compressing the gas in multiple stages.

The key components include:

  • Cylinders and pistons: Responsible for gas compression by reducing its volume.

  • Crankcase, connecting rods, and crossheads: Convert rotary motion from the driver into linear reciprocating motion.

  • Valves: Regulate the controlled intake and discharge of gas.

  • Seals and packings: Prevent leakage and protect the system from contamination.

  • Cooling systems: Maintain optimal operating temperatures throughout the compression process.

Application Areas:

API 618 compressors are used in:

  • Natural gas compression (e.g., cavern storage)

  • Petrochemical processes (e.g., ethylene, hydrogen, CO₂ compression)

  • Refineries

  • Industrial gases (e.g., nitrogen, oxygen, helium)

Advantages compared to other compressor types:

  • High efficiency at low speeds

  • Robustness during intermittent operation

  • Flexibility in terms of gas composition, pressure, and volume requirements

  • Easy maintenance and long operating time