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Vapor Pressure Margin 2
- Thread starter CaracasEC
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Airsporter1st
Mechanical
API 682 3rd Edition says a margin of at not less than 30% between seal chamber pressure and maximum fluid vapour pressure, or a 20 degC product temperature margin based on maximum process fluid temperature.
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Hi Airporter1st,
Thanks for these data, i will look again on the API 682 as this is the fact i'm looking now for almost 3 days and yet not found. Is it also a rule of thumb that the seal chamber pressure should be higher than 1 bar to the fluid vapor pressure?
Thanks for these data, i will look again on the API 682 as this is the fact i'm looking now for almost 3 days and yet not found. Is it also a rule of thumb that the seal chamber pressure should be higher than 1 bar to the fluid vapor pressure?
Airsporter1st
Mechanical
Like many things in API 682, this particular statement appears where you would not expect to find it!!!
It is at the bottom of Page 25 of the 3rd Edition.
The rules of thumb I have used in the past were 25 psig higher for S.G. > 0.5 and 50 psig higher for S.G. < 0.5. I am not sure now whether they came from other standards, an earlier version of 682 or were just company standards.
For me, therefore, 1 barg margin would not be enough.
It is at the bottom of Page 25 of the 3rd Edition.
The rules of thumb I have used in the past were 25 psig higher for S.G. > 0.5 and 50 psig higher for S.G. < 0.5. I am not sure now whether they came from other standards, an earlier version of 682 or were just company standards.
For me, therefore, 1 barg margin would not be enough.
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