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Portable "Dolly" Mounted SF6 Recovery System Comparison
Feature |
DILOMINI 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 |
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.