Under what circumstances can the sewage ditch in the liquefied gas tank area be omitted?

For storage vessels in dedicated LPG service always having an adiabatic flash fraction larger than 0.1 (the fraction on a mole basis)？ If the material will vaporize when transferred from the process conditions to 1 bar (abs), with an adiabatic flash temperature that is 20°C or more lower than the lowest ambient temperature, then it is possible to omit the concrete paving as well as the perimeter drainage channels. For LPG-specific storage tanks, when there is always a flash fraction of more than 0.1 (on a molar basis) that turns into vapor when going from the process conditions to 1 bar, and the resulting adiabatic flash temperature is 20°C or lower than the lowest ambient temperature, the concrete flooring and boundary drainage ditches can also be omitted. Note that 1 bar is absolute pressure; 20 0C should be 20 degrees, right? For reference only :)

I made slight modifications, as follows: For LPG-specific storage tanks in which the adiabatic flash ratio is always greater than 0.1 (on a molar basis), when vaporization occurs under process conditions at 1 bar (absolute pressure) and the final adiabatic flash temperature is 20 degrees or more lower than the lowest ambient temperature, then concrete lining as well as drainage ditches are not required. It seems the punctuation in the original text is a bit unclear; we could discuss this further.

The original text is really confusing: lol

The translation on the 3rd floor was excellent; the person has a strong command of English and is highly professional. Thank you for sharing with everyone.

For LPG storage tanks, when the flash evaporation occurs under process conditions of 1 bar (absolute pressure) and the adiabatic flash temperature is 20 degrees or more lower than the lowest ambient temperature, there is always more than 0.1 (molar) of the component that flashes adiabatically as a gas; in such cases, a concrete pavement and surrounding drainage ditches are not necessary. Is that the right way to understand it? \"Fraction\" is used to refer to components or fractions.

For LPG storage tanks, when the flash evaporation occurs under process conditions of 1 bar (absolute pressure) and the adiabatic flash temperature is 20 degrees or more lower than the lowest ambient temperature, there is always more than 0.1 (molar) of the component that flashes adiabatically as a gas; in such cases, a concrete pavement and surrounding drainage ditches are not necessary. Is that the right way to understand it? \"Fraction\" is used to refer to components or fractions.

The adiabatic flash fraction refers to the ratio (mole ratio) of the gaseous portion resulting from adiabatic flashing of a liquid during depressurization. I consider \"always having an adiabatic flash fraction larger than 0.1 (the fraction on a mole basis)\\" as an attribute of a dedicated LPG service, while translating \"going to vapour when flashed from process conditions to 1 bar (abs) together with a resulting adiabatic flash temperature 20°C or more below the lowest ambient temperature\" as a conditional clause. The original text by the poster is missing a right parenthesis “)”, which plays a decisive role in sentence punctuation; whether it is in the position assumed in post 2 or elsewhere has a significant impact on determining the structure of the sentence. Could the original poster take a look?

If the original text reads: For storage vessels in dedicated LPG service always having an adiabatic flash fraction larger than 0.1 (the fraction on a mole base going to vapour when flashed from process conditions to 1 bar (abs)) together with a resulting adiabatic flash temperature 20°C or more below the lowest ambient temperature, the concrete paving together with the perimeter drain channels can be omitted. Then the entire phrase “always having ... ambient temperature” should be regarded as an adjective describing the dedicated LPG service, while “(the fraction on a mole base going to vapour when flashed from process conditions to 1 bar (abs))” serves as a clarification of the adiabatic flash fraction. In this case, the translation would be: For LPG storage tanks in dedicated LPG service whose adiabatic flash fraction is always greater than 0.1 (the mole ratio of material that turns into vapor when flashed from the process conditions to 1 bar (absolute pressure)), and whose adiabatic flash temperature is 20°C or more lower than the lowest ambient temperature, it is not necessary to use concrete covering or perimeter drainage channels. This understanding and punctuation seem more reasonable. Last edited by bone on 2007-12-3 13:25]

Thank you! The original text just lacks a bracket.