Layout problem of propylene spheres
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There are currently 2 propylene spheres and 4 C4 spheres, all with a capacity of 2000 m³ and without insulation. Can these 6 spherical tanks be arranged within one tank group, that is, inside a fire dike, with partitions installed between the tanks? Specification requirement: In accordance with Article 6.3.2, Paragraph 5 of GB50160 (2018 edition), spherical tanks shall not be installed within a single tank assembly if they are not capable of withstanding the lowest temperature resulting from a leak of any medium present in that tank assembly. The material of the C4 sphere tank must be capable of withstanding the lowest temperature resulting from propylene leakage, which is -47°C. This is a common issue in design; let’s discuss it: ① How to calculate the metal wall temperature at the bottom of the butane tank when the propylene tank ruptures? ② The drop in temperature around the butane tank caused by the rupture of the propylene tank is expected to be a short-term phenomenon – so how should time be calculated in this case? ③ There is no need for calculation; it can be assumed that a temperature of -47°C exists as long as there is a leak. Insulation should be designed for the C4 tank to accommodate such low-temperature conditions. ④ If the design temperature for the propylene tanks takes into account only an ambient temperature of -15°C, then do these two propylene tanks also require insulation? ⑤Do everyone follow paragraph 5 of 6.3.2 when designing?
"\"The spherical tank cannot withstand the lowest temperature resulting from a leak of any medium within the tank farm.\" My understanding of this statement in the standards is that if it is only the spherical tank that leaks, then the liquid hydrocarbons that escape will vaporize, and this has no effect on the other tanks; it is only when a pool of liquid forms within the tank farm that low temperatures can affect the other tanks. A night pool can only form if the spherical tank ruptures, and such an accident should not occur. In this case, this rule loses its meaning. I wonder what everyone thinks. I hope everyone will engage in active discussions!