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PAP Plus® S1

Introducing the PAP Plus® S1 Centrifugal Compressor by FS-Elliott: a compact yet powerful solution designed to deliver dependable performance in air compression applications. Engineered for versatility, the S1 is available in one-, two-, and three-stage configurations, ensuring optimal efficiency tailored to your specific needs.

With a reliable flow of up to 60 m3/min or 2,200 CFM, the S1 sets a new standard for compact yet high-capacity compression.

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As a member of the PAP Plus series, the S1 combines more than 60 years of operational and design experience in a highly robus, and uniquely easy-to-manage package.

  • Flow: 25 – 60 m3/min | 900 – 2,200 CFM
  • Power: 120 – 375 kW | 160 – 500 hp
  • Pressure: 2.75 – 12.1 barg | 40 – 175 psig


PAP Plus S1 Features & Benefits

  • Designed to exact specifications – from API 672 to end users’ own complex needs.
  • Straight-through intercooler tube accommodates periodic cleaning, rather than replacement.
  • State-of-the-art, backward leaning impeller design that provides a broad range of superior aerodynamic performance characteristics.
  • Adjustable inlet guided vane adjust to plant conditions and load variations to save energy.
  • Full-capacity auxiliary oil pump continues normal, safe operation in the event of a main oil pump failure.
  • Filter monitoring package allows operators to receive real-time differential pressure of the oil and air filters.
  • Microprocessor-based smart transmitters capable of performing evaluations and producing diagnostics allow the operator to understand the condition of their compressed air system from a remote location.
  • Horizontally split gear case and internal components are integral features of the only truly field-serviceable gear box in the industry.
  • Regulus Control System allows the operator to control and manage the performance of one or multiple compressors, at the unit or remotely, to meet air demands while maximizing savings.
  • ISO 8573-1 CLASS 0, 100% oil-free air minimizes downtime from oil contamination in the production line and eliminates the need for off-site condensate disposal.
  • Engineered coatings designed for extreme conditions provide extended service life of internal and external surfaces, reduced maintenance, and corrosion prevention.

Case Study: Ethylene Plant Saved Over $100K/Year & Increased Demand


  1. Case Study

    Learn how the world's largest single-site ethylene plant saved over $100K/year and increased demand.

    Download the full case study. 

  2. Background

    One of the world’s largest single-site ethylene facilities needed to upgrade its air system.

    Download the full case study.

  3. Manufacturing Challenge

    They needed to increase capacity while reusing the existing layout for minimal civil changes without disturbing key plant components and complying with API 672 Basic Duty requirements.

    Download the full case study.

  4. Results

    The plant was able to save over $100K in yearly maintenance and energy savings while using its existing layout, saving another $150K in installation costs. 

    Download the full case study.

Learn how the world's largest single-site ethylene plant saved over $100K/year and increased demand.

Download the full case study. 

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