AGRU-4: SF6 recovery equipment

SF₆ recovery unit with liquid storage for small-volume equipment

The AGRU-4 recovers, purifies and stores the SF₆ of switchgear and circuit breakers rated up to 69 kV, liquefying the gas with an oil-less compressor of up to 34 bar — with no emissions to the atmosphere.

Advantages

Liquefaction in any climate
The high-pressure, direct-drive oil-less compressor delivers a 1000:1 compression ratio and up to 34 bar, enough to store SF₆ as a liquid even in warm climates.

The whole service cycle on one cart
Recovery, evacuation of air and moisture, purification and regulated refilling are all performed from the same two-wheel cart, switching between modes with just two valves.

Cleaning while it recovers
During recovery and refilling the gas is dried, purified and filtered to 0.1 µm, removing particles, moisture and SF₆ decomposition products.

Storage without limits
The recovered gas fills the on-board 22.7 kg tank, and an auxiliary connection extends storage to external cylinders; partially used bottles can be consolidated into one.

Low-maintenance construction
Filters are replaced without disconnecting tubing or special tools, a colour-change indicator shows gas moisture at a glance and the fittings are stainless steel.

Applications

• Recovery and purification of SF₆ in metal-clad switchgear, bus ducts and individual circuit breakers.
• Evacuation of air and moisture from equipment before filling.
• Consolidation of partially used SF₆ cylinders.
• Regulated refilling of SF₆ equipment from the storage tank.

About the product

The AGRU-4 mounts on a reinforced hand cart with 250 mm tires and is supplied complete with power cable; options include a storage tank heater, an insulating blanket, 3 m or 6 m hoses in rubber or stainless braid, an XDS vacuum stage below 1 mbar and a vacuum compressor of 3.3 m³/h that raises SF₆ recovery to 99.9 %.

Technical specifications

Frequently asked questions

Does it store the gas as liquid or as vapour?
As liquid: the 34 bar compressor liquefies the SF₆ into the on-board 22.7 kg tank or into external cylinders through the auxiliary connection.

What vacuum does it reach when recovering?
Standard recovery goes down to 100 mbar; the optional XDS vacuum stage takes it below 1 mbar, equivalent to recovering 99.9 % of the gas with the optional vacuum compressor.

Is the gas cleaned during recovery?
Yes. The gas is dried, purified and filtered to 0.1 µm both while recovering and while refilling, so it returns to the equipment in serviceable condition.

Can it top up equipment from bottles?
Yes. The regulated inlet refills equipment from the storage tank, and the unit also consolidates several partially used bottles into a single cylinder.