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#1
Posted 24 October 2019 - 05:29 PM
I want to ask some questions about chemical storage:
1) In the MSDS, it mentions the vapor pressure at 20 degree C. Is it the RVP or TVP ?
2) should I determine the TVP at the storage temperature or which temperature?
3) how to determine if the chemical should be stored in fixed or floating roof ?
4) how to determine the material selection of the tank ?
I have done some research and found that TVP less than 1.5 psia (Fixed Roof), TVP 1.5 to 11.5 psia ( Floating Roof), and TVP above 11.5 psia (Pressurized Tank). As you can see the API does not specify TVP at which temperature.
#2
Posted 24 October 2019 - 07:23 PM
Some answers:
Edited by Pilesar, 24 October 2019 - 07:27 PM.
#3
Posted 25 October 2019 - 03:18 AM
#4
Posted 25 October 2019 - 06:04 AM
For RVP between zero and 5 psi, the TVP and RVP should be very close to your interpolated vapor pressure results (within about 1 psi.) Real measurements are more accurate than literature data for any particular fluid. The lightest 5% in the composition greatly affect the vapor pressure.The RVP and TVP are lab results found after following explicit directions. TVP is a more complicated and expensive test, so the easier RVP is frequently used instead. I would assume vapor pressure at 37.8 C in literature would match the TVP in literature.
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