Many flare gas recovery projects never move beyond the feasibility stage because sweetening and amine regeneration requirements make implementation too complex or costly. GARO's WAIS + ARU system addresses this challenge by combining flare gas recovery, gas sweetening, and dedicated amine regeneration into one integrated solution. Based on proven WAIS technology, the system helps operators reduce flaring, lower emissions, and recover valuable hydrocarbons while minimizing dependence on existing plant infrastructure.

When Flare Gas Recovery Depends on Available AGRU Capacity

The Challenge

Recovering flare gas is one of the most effective ways to reduce emissions and improve plant efficiency. However, many flare gas streams contain acid gases such as H₂S and CO₂ that require treatment before the gas can be reused.

In many facilities, this creates a significant challenge: the flare gas recovery project becomes dependent on existing amine regeneration infrastructure. If available AGRU capacity is limited, fully utilized, or located far from the recovery unit, project costs and complexity increase dramatically.

As a result, operators are often forced to choose between expensive infrastructure upgrades or continued flaring.

Garo WAIS System

A Simpler Approach to Flare Gas Recovery and Gas Sweetening

The Solution

WAIS + ARU combines three essential functions within a single engineered package:

  • Flare gas recovery
  • Gas sweetening
  • Amine regeneration

Unlike conventional systems that rely on separate treatment and regeneration facilities, WAIS + ARU provides an integrated and largely self-sufficient solution.

This allows operators to recover sour flare gas, reduce emissions, and simplify project implementation without relying on available regeneration capacity elsewhere in the plant.

Garo WAIS System picture

How the WAIS + ARU System Works

Process Overview

The WAIS section compresses flare gas while simultaneously removing acid gases through an integrated amine washing process. The treated gas can then be reused within the facility, while the rich amine is routed to the dedicated ARU for regeneration.

The regenerated lean amine is returned to the WAIS unit, creating a continuous closed-loop process that delivers reliable sweetening performance without dependence on external regeneration systems.

 

Garo WAIS + ARU scheme

Key Advantages of WAIS + ARU System

Continuous-duty performance with minimal maintenance

Independent Operation

Reduced project complexity

Reduced Project Complexity

Lower environmental impact

Lower Environmental Impact

Hydrocarbon recovery

Hydrocarbon Recovery

Download the Complete WAIS + ARU Guide

The brochure includes:

✔ Complete process description

 ✔ Detailed process flow explanation

 ✔ Equipment-by-equipment overview

 ✔ WAIS and ARU integration details

 ✔ Application examples

 ✔ Operational and environmental benefit

Garo WAIS + ARU brochure thumbnail

Typical Applications

WAIS + ARU is particularly beneficial for facilities that need flare gas recovery and gas sweetening but have limited access to amine regeneration capacity.

Refineries

Refineries

Petrochemical plants

Petrochemical Plants

Natural Gas Processing Facilities

Natural Gas Processing Facilities

Biogas and Renewable Gas Projects

Biogas and Renewable Gas Projects

Brownfield Facilities

Brownfield Facilities

Greenfield Developments

Greenfield Developments

Why Choose GARO?

GARO has decades of experience delivering flare gas recovery solutions to energy and process industries worldwide. The company's expertise in liquid ring compressor technology and flare gas recovery applications enables customers to reduce emissions, improve efficiency, and recover value from gases that would otherwise be lost.

 

What Sets GARO Apart

  • Specialized flare gas recovery expertise
  • Proven WAIS technology
  • Fully integrated WAIS + ARU solution
  • Engineered package approach
  • Support for both greenfield and brownfield projects
  • Global application experience
Garo WAIS System picture 3

Frequently Asked Questions

WAIS + ARU is GARO's integrated flare gas recovery solution that combines flare gas compression, gas sweetening, and amine regeneration in a single engineered package. The system recovers valuable hydrocarbons while removing acid gases such as H₂S and CO₂.