Recovery Calculations

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Determining How Much Gas Has Been Recovered

Ever wonder how much gas is actually being left behind, when you’ve recovered as much as you can with your current recovery system? Ever wonder how much truth is in the claims of 99% recovery, by almost all manufacturers of SF6 recovery systems? Discovering the volumes of gas actually recovered, is quite simple. The only two variables needed are: normal breaker operating pressure, and the final pressure the recovery system can generate during SF6 recovery. Take these two values, and plug them into the following formulas. Many carts claiming 99% recovery fall far short. Use data provided by other manufacturers, prior to buying new equipment!

( (PI – PF) : PI ) x 100 = % recovered

PI = Initial breaker pressure in mmHg(absolute)

PF = Final breaker pressure in mmHg(absolute)

 

Converting PSIG to mmHg (absolute)

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

 

Example 1

Initial breaker pressure = 87 psig

Final breaker pressure (or blank-off pressure of recovery equipment) = 200 mmHg

( (87 psgi + 14.5) : 14.5) x 760 = 5,320 mmHg (absolute)

( (5,320 mmHg – 200 mmHg) : 5,320 mmHg) x 100 = 96.24 %

Using the same breaker , and a cart with the ability to pull down to 35 mmHg absolute, we can expect the following results.

 

Example 2

Initial breaker pressure = 87 psig

Final breaker pressure = 35 mmHg

( (5,320 mmHg – 35 mmHg) : 5,320 mmHg) x 100 = 99.34 %

It is easy to see that the better the vacuum, the better the recovery. If you have any questions, please contact DILO.

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