garo wais flare gas recovery brochure .pdf

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GARO® WAIS Washing Amine Integrated System
Building on a legacy of innovation, the engineers
at Garo sought to improve flare gas recovery
by analyzing the processes involved and seeing
where enhancements could be made. The result:
GARO’s patented Washing Amine Integrated
System (WAIS), which uses amine solution as a
service liquid in the compression phase of flare
gas recovery.

• No SWS Treatment

Compared to traditional systems, WAIS simplifies
the flare gas recovery process by removing the
need for a gas treating unit; in addition to the
need for cooling and treatment water, while
allowing the system to produce a sweet gas with a
residual content of Sulfur related compounds low
enough to comply with environmental regulations,
without the need to further scrub the gas.

• Reduced operating costs

The result is a Flare Gas Recovery system that
is safe, flexible, and reliable, and can provide
significant cost savings to refineries.

• No need for amine washing unit
• No cooling water
• No process water

• Complete system warranty

6. Recovered sweet gas
to fuel gas network

Flare Gas Recovery System Equipped with
GARO Amine Liquid Ring Compressor - WAIS Patent

5. Additional stream of
rich amine for final
gas sweetening

4. Semi-rich amine sent to
main absorption tower
to be reused

1. Sour Gas
2. Rich Amine

3. Skimmed Hydrocarbons

Garo’s WAIS replaces the gas/liquid separator used in
earlier systems with an innovative three phase separator.
Though similar in appearance to conventional flash tanks,
which work by receiving streams of rich amine evolving gas
by pressure release, the three phase separator does not rely
on pressure release and the material exiting the compressor
is a mix composed of gas, liquid, and aerosol. The diagram
below is a process scheme that shows how the open loop
Garo WAIS system works.
From an operational point of view, the system recovers gas
by maintaining a slight positive pressure on the flare header,
which is located upstream of the liquid seal drum. If the
volume of gas released into the flare system exceeds the

capacity of the gas recovery system, pressure in the flare
header will build until it exceeds the back-pressure created
by the liquid level of the liquid seal drum. At this point,
excess gas volume will begin to flow to the flare.
If the volume of gas relieved into the flare system is less
than the full capacity of the gas recovery system, the system
is automatically turned down by staging compressors,
and the discharge gas is diverted back to the suction
header ensuring continuous operation during varying load

Gardner Denver Nash, LLC
PO Box 130
Bentleyville, PA 15314 USA
+1 724 239 1500
©2017 Gardner Denver Nash, LLC Printed in U.S.A.
GDN-APP-WAIS-1144 2nd Ed. 06/17

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