Comparison

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Portable “Dolly” Mounted SF6 Recovery System Comparison

Feature

DILO

MINI Plus II

Brand A

Brand B

Brand C

Liquefaction (process)

Yes, direct pressure Yes, cooling assisted Yes, cooling assisted No, insignificant pressure

Contains oil

No No Yes No

Compressor used during re-fill

Yes No No Yes

Maximum delivery rates (LB/min)

1 .5 .4 .5

Displacement (CFH)

75 CFH 35 CFH 30 CFH 30 CFH

Maximum compressor output (psig)

725 psig 475 psig 460 psig 375 psig

Maximum vacuum while suctioning SF6 (mmHg)1

35 mmHg 1,300 mmHg 400 mmHg 1100 mmHg

Compression ratio

1000:1 20:1 60:1 20:1

Maximum capacity
(on-board)

230 lbs. 150 lbs. 50 lbs. 20 lbs.

Weight of unit (complete)2

240 lbs. 420 lbs. 185 lbs. 135 lbs.

Vacuum pump speed (CFM)

10 CFM 11 CFM 3 CFM 6 CFM

Vacuum pump capacity (micron)

10 micron 1000 micron 500 micron 100 micros

Self sealing fittings (type)

Yes, DILO No Yes, Aeroquip? No

Cylinder consolidation

Yes No Yes, limited No

Storage method

SF6 cylinder ASME tank* SF6 cylinder Refrigerant tank, non-approved*

Valves

3 10 6 6

Maximum percentage recovered3

99.34%

75.56%

92.48%

79.32%

These values were taken from sales literature from each of the respective manufacturers.

1 Using the manufacturers’ published compression ratios, the following formula was used to obtain correct final pressures: Convert maximum compressor output pressure to mmHg.
This value is then divided into the compression ratio.

( (PSIG +14.5) : 14.5) x 760 = mmHg (absolute)

2 This does not include the weight of cylinders, since various sizes/weights can be used.

* Refrigeration vessels, and ASME tanks are not DOT approved for SF6.
Transportation of these vessels with internal pressures greater than 41 psig, is in violation of CFR 173.

3 See “Determining How Much Gas Has Been Recovered” page for formulas used to derive percentages.

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